xref: /linux/arch/x86/kvm/svm/svm.c (revision 03741bcea0a9ec4c8f386fd5c6051c1a14070240)

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kvm_host.h>

#include "irq.h"
#include "mmu.h"
#include "regs.h"
#include "x86.h"
#include "smm.h"
#include "cpuid.h"
#include "pmu.h"

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>
#include <linux/amd-iommu.h>
#include <linux/sched.h>
#include <linux/trace_events.h>
#include <linux/slab.h>
#include <linux/hashtable.h>
#include <linux/objtool.h>
#include <linux/psp-sev.h>
#include <linux/file.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include <linux/rwsem.h>
#include <linux/cc_platform.h>
#include <linux/smp.h>
#include <linux/string_choices.h>
#include <linux/mutex.h>

#include <asm/apic.h>
#include <asm/msr.h>
#include <asm/perf_event.h>
#include <asm/tlbflush.h>
#include <asm/desc.h>
#include <asm/debugreg.h>
#include <asm/kvm_para.h>
#include <asm/irq_remapping.h>
#include <asm/spec-ctrl.h>
#include <asm/cpu_device_id.h>
#include <asm/cpuid/api.h>
#include <asm/traps.h>
#include <asm/reboot.h>
#include <asm/fpu/api.h>
#include <asm/virt.h>

#include <trace/events/ipi.h>

#include "trace.h"

#include "vmenter.h"
#include "svm.h"
#include "svm_ops.h"

#include "hyperv.h"
#include "kvm_onhyperv.h"
#include "svm_onhyperv.h"

MODULE_AUTHOR("Qumranet");
MODULE_DESCRIPTION("KVM support for SVM (AMD-V) extensions");
MODULE_LICENSE("GPL");

#ifdef MODULE
static const struct x86_cpu_id svm_cpu_id[] = {
	X86_MATCH_FEATURE(X86_FEATURE_SVM, NULL),
	{}
};
MODULE_DEVICE_TABLE(x86cpu, svm_cpu_id);
#endif

#define SEG_TYPE_LDT 2
#define SEG_TYPE_BUSY_TSS16 3

static bool erratum_383_found __read_mostly;

/*
 * Set osvw_len to higher value when updated Revision Guides
 * are published and we know what the new status bits are
 */
static uint64_t osvw_len = 4, osvw_status;
static DEFINE_SPINLOCK(osvw_lock);

static DEFINE_PER_CPU(u64, current_tsc_ratio);

/*
 * These 2 parameters are used to config the controls for Pause-Loop Exiting:
 * pause_filter_count: On processors that support Pause filtering(indicated
 *	by CPUID Fn8000_000A_EDX), the VMCB provides a 16 bit pause filter
 *	count value. On VMRUN this value is loaded into an internal counter.
 *	Each time a pause instruction is executed, this counter is decremented
 *	until it reaches zero at which time a #VMEXIT is generated if pause
 *	intercept is enabled. Refer to  AMD APM Vol 2 Section 15.14.4 Pause
 *	Intercept Filtering for more details.
 *	This also indicate if ple logic enabled.
 *
 * pause_filter_thresh: In addition, some processor families support advanced
 *	pause filtering (indicated by CPUID Fn8000_000A_EDX) upper bound on
 *	the amount of time a guest is allowed to execute in a pause loop.
 *	In this mode, a 16-bit pause filter threshold field is added in the
 *	VMCB. The threshold value is a cycle count that is used to reset the
 *	pause counter. As with simple pause filtering, VMRUN loads the pause
 *	count value from VMCB into an internal counter. Then, on each pause
 *	instruction the hardware checks the elapsed number of cycles since
 *	the most recent pause instruction against the pause filter threshold.
 *	If the elapsed cycle count is greater than the pause filter threshold,
 *	then the internal pause count is reloaded from the VMCB and execution
 *	continues. If the elapsed cycle count is less than the pause filter
 *	threshold, then the internal pause count is decremented. If the count
 *	value is less than zero and PAUSE intercept is enabled, a #VMEXIT is
 *	triggered. If advanced pause filtering is supported and pause filter
 *	threshold field is set to zero, the filter will operate in the simpler,
 *	count only mode.
 */

static unsigned short __ro_after_init pause_filter_thresh = KVM_DEFAULT_PLE_GAP;
module_param(pause_filter_thresh, ushort, 0444);

static unsigned short __ro_after_init pause_filter_count = KVM_SVM_DEFAULT_PLE_WINDOW;
module_param(pause_filter_count, ushort, 0444);

/* Default doubles per-vcpu window every exit. */
static unsigned short __ro_after_init pause_filter_count_grow = KVM_DEFAULT_PLE_WINDOW_GROW;
module_param(pause_filter_count_grow, ushort, 0444);

/* Default resets per-vcpu window every exit to pause_filter_count. */
static unsigned short __ro_after_init pause_filter_count_shrink = KVM_DEFAULT_PLE_WINDOW_SHRINK;
module_param(pause_filter_count_shrink, ushort, 0444);

/* Default is to compute the maximum so we can never overflow. */
static unsigned short __ro_after_init pause_filter_count_max = KVM_SVM_DEFAULT_PLE_WINDOW_MAX;
module_param(pause_filter_count_max, ushort, 0444);

/*
 * Use nested page tables by default.  Note, NPT may get forced off by
 * svm_hardware_setup() if it's unsupported by hardware or the host kernel.
 */
bool __ro_after_init npt_enabled = true;
module_param_named(npt, npt_enabled, bool, 0444);

bool gmet_enabled = true;
module_param_named(gmet, gmet_enabled, bool, 0444);

/* allow nested virtualization in KVM/SVM */
static int __ro_after_init nested = true;
module_param(nested, int, 0444);

/* enable/disable Next RIP Save */
int __ro_after_init nrips = true;
module_param(nrips, int, 0444);

/* enable/disable Virtual VMLOAD VMSAVE */
static int __ro_after_init vls = true;
module_param(vls, int, 0444);

/* enable/disable Virtual GIF */
int __ro_after_init vgif = true;
module_param(vgif, int, 0444);

/* enable/disable LBR virtualization */
int __ro_after_init lbrv = true;
module_param(lbrv, int, 0444);

static int __ro_after_init tsc_scaling = true;
module_param(tsc_scaling, int, 0444);

module_param(enable_device_posted_irqs, bool, 0444);

bool __read_mostly dump_invalid_vmcb;
module_param(dump_invalid_vmcb, bool, 0644);


bool __ro_after_init intercept_smi = true;
module_param(intercept_smi, bool, 0444);

bool __ro_after_init vnmi = true;
module_param(vnmi, bool, 0444);

module_param(enable_mediated_pmu, bool, 0444);

static bool __ro_after_init svm_gp_erratum_intercept = true;

static u8 rsm_ins_bytes[] = "\x0f\xaa";

static unsigned long __read_mostly iopm_base;

DEFINE_PER_CPU(struct svm_cpu_data, svm_data);

static DEFINE_MUTEX(vmcb_dump_mutex);

/*
 * Only MSR_TSC_AUX is switched via the user return hook.  EFER is switched via
 * the VMCB, and the SYSCALL/SYSENTER MSRs are handled by VMLOAD/VMSAVE.
 *
 * RDTSCP and RDPID are not used in the kernel, specifically to allow KVM to
 * defer the restoration of TSC_AUX until the CPU returns to userspace.
 */
int tsc_aux_uret_slot __ro_after_init = -1;

static int get_npt_level(void)
{
#ifdef CONFIG_X86_64
	return pgtable_l5_enabled() ? PT64_ROOT_5LEVEL : PT64_ROOT_4LEVEL;
#else
	return PT32E_ROOT_LEVEL;
#endif
}

int svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	u64 old_efer = vcpu->arch.efer;
	vcpu->arch.efer = efer;

	if (!npt_enabled) {
		/* Shadow paging assumes NX to be available.  */
		efer |= EFER_NX;

		if (!(efer & EFER_LMA))
			efer &= ~EFER_LME;
	}

	if ((old_efer & EFER_SVME) != (efer & EFER_SVME)) {
		if (!(efer & EFER_SVME)) {
			/*
			 * Architecturally, clearing EFER.SVME while a guest is
			 * running yields undefined behavior, i.e. KVM can do
			 * literally anything.  Force the vCPU back into L1 as
			 * that is the safest option for KVM, but synthesize a
			 * triple fault (for L1!) so that KVM at least doesn't
			 * run random L2 code in the context of L1.  Do so if
			 * and only if the vCPU is actively running, e.g. to
			 * avoid positives if userspace is stuffing state.
			 */
			if (is_guest_mode(vcpu) && vcpu->wants_to_run)
				kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);

			svm_leave_nested(vcpu);
			/* #GP intercept is still needed for vmware backdoor */
			if (!enable_vmware_backdoor)
				clr_exception_intercept(svm, GP_VECTOR);

			/*
			 * Free the nested guest state, unless we are in SMM.
			 * In this case we will return to the nested guest
			 * as soon as we leave SMM.
			 */
			if (!is_smm(vcpu))
				svm_free_nested(svm);

		} else {
			int ret = svm_allocate_nested(svm);

			if (ret) {
				vcpu->arch.efer = old_efer;
				return ret;
			}

			/*
			 * Never intercept #GP for SEV guests, KVM can't
			 * decrypt guest memory to workaround the erratum.
			 */
			if (svm_gp_erratum_intercept && !is_sev_guest(vcpu))
				set_exception_intercept(svm, GP_VECTOR);
		}

		svm_pmu_handle_nested_transition(svm);
		kvm_make_request(KVM_REQ_RECALC_INTERCEPTS, vcpu);
	}

	svm->vmcb->save.efer = efer | EFER_SVME;
	vmcb_mark_dirty(svm->vmcb, VMCB_CR);
	return 0;
}

static u32 svm_get_interrupt_shadow(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	u32 ret = 0;

	if (svm->vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK)
		ret = KVM_X86_SHADOW_INT_STI | KVM_X86_SHADOW_INT_MOV_SS;
	return ret;
}

static void svm_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	if (mask == 0)
		svm->vmcb->control.int_state &= ~SVM_INTERRUPT_SHADOW_MASK;
	else
		svm->vmcb->control.int_state |= SVM_INTERRUPT_SHADOW_MASK;

}

static int __svm_skip_emulated_instruction(struct kvm_vcpu *vcpu,
					   int emul_type,
					   bool commit_side_effects)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	unsigned long old_rflags;

	/*
	 * SEV-ES does not expose the next RIP. The RIP update is controlled by
	 * the type of exit and the #VC handler in the guest.
	 */
	if (is_sev_es_guest(vcpu))
		goto done;

	if (nrips && svm->vmcb->control.next_rip != 0) {
		WARN_ON_ONCE(!cpu_feature_enabled(X86_FEATURE_NRIPS));
		svm->next_rip = svm->vmcb->control.next_rip;
	}

	if (!svm->next_rip) {
		if (unlikely(!commit_side_effects))
			old_rflags = svm->vmcb->save.rflags;

		if (!kvm_emulate_instruction(vcpu, emul_type))
			return 0;

		if (unlikely(!commit_side_effects))
			svm->vmcb->save.rflags = old_rflags;
	} else {
		kvm_rip_write(vcpu, svm->next_rip);
	}

done:
	if (likely(commit_side_effects))
		svm_set_interrupt_shadow(vcpu, 0);

	return 1;
}

int svm_skip_emulated_instruction(struct kvm_vcpu *vcpu)
{
	return __svm_skip_emulated_instruction(vcpu, EMULTYPE_SKIP, true);
}

static int svm_update_soft_interrupt_rip(struct kvm_vcpu *vcpu, u8 vector)
{
	const int emul_type = EMULTYPE_SKIP | EMULTYPE_SKIP_SOFT_INT |
			      EMULTYPE_SET_SOFT_INT_VECTOR(vector);
	unsigned long rip, old_rip = kvm_rip_read(vcpu);
	struct vcpu_svm *svm = to_svm(vcpu);

	/*
	 * Due to architectural shortcomings, the CPU doesn't always provide
	 * NextRIP, e.g. if KVM intercepted an exception that occurred while
	 * the CPU was vectoring an INTO/INT3 in the guest.  Temporarily skip
	 * the instruction even if NextRIP is supported to acquire the next
	 * RIP so that it can be shoved into the NextRIP field, otherwise
	 * hardware will fail to advance guest RIP during event injection.
	 * Drop the exception/interrupt if emulation fails and effectively
	 * retry the instruction, it's the least awful option.  If NRIPS is
	 * in use, the skip must not commit any side effects such as clearing
	 * the interrupt shadow or RFLAGS.RF.
	 */
	if (!__svm_skip_emulated_instruction(vcpu, emul_type, !nrips))
		return -EIO;

	rip = kvm_rip_read(vcpu);

	/*
	 * Save the injection information, even when using next_rip, as the
	 * VMCB's next_rip will be lost (cleared on VM-Exit) if the injection
	 * doesn't complete due to a VM-Exit occurring while the CPU is
	 * vectoring the event.   Decoding the instruction isn't guaranteed to
	 * work as there may be no backing instruction, e.g. if the event is
	 * being injected by L1 for L2, or if the guest is patching INT3 into
	 * a different instruction.
	 */
	svm->soft_int_injected = true;
	svm->soft_int_csbase = svm->vmcb->save.cs.base;
	svm->soft_int_old_rip = old_rip;
	svm->soft_int_next_rip = rip;

	if (nrips)
		kvm_rip_write(vcpu, old_rip);

	if (cpu_feature_enabled(X86_FEATURE_NRIPS))
		svm->vmcb->control.next_rip = rip;

	return 0;
}

static void svm_inject_exception(struct kvm_vcpu *vcpu)
{
	struct kvm_queued_exception *ex = &vcpu->arch.exception;
	struct vcpu_svm *svm = to_svm(vcpu);

	kvm_deliver_exception_payload(vcpu, ex);

	if (kvm_exception_is_soft(ex->vector) &&
	    svm_update_soft_interrupt_rip(vcpu, ex->vector))
		return;

	svm->vmcb->control.event_inj = ex->vector
		| SVM_EVTINJ_VALID
		| (ex->has_error_code ? SVM_EVTINJ_VALID_ERR : 0)
		| SVM_EVTINJ_TYPE_EXEPT;
	svm->vmcb->control.event_inj_err = ex->error_code;
}

static void svm_init_erratum_383(void)
{
	u64 val;

	if (!static_cpu_has_bug(X86_BUG_AMD_TLB_MMATCH))
		return;

	/* Use _safe variants to not break nested virtualization */
	if (native_read_msr_safe(MSR_AMD64_DC_CFG, &val))
		return;

	val |= (1ULL << 47);

	native_write_msr_safe(MSR_AMD64_DC_CFG, val);

	erratum_383_found = true;
}

static void svm_init_osvw(struct kvm_vcpu *vcpu)
{
	/*
	 * Guests should see errata 400 and 415 as fixed (assuming that
	 * HLT and IO instructions are intercepted).
	 */
	vcpu->arch.osvw.length = (osvw_len >= 3) ? (osvw_len) : 3;
	vcpu->arch.osvw.status = osvw_status & ~(6ULL);

	/*
	 * By increasing VCPU's osvw.length to 3 we are telling the guest that
	 * all osvw.status bits inside that length, including bit 0 (which is
	 * reserved for erratum 298), are valid. However, if host processor's
	 * osvw_len is 0 then osvw_status[0] carries no information. We need to
	 * be conservative here and therefore we tell the guest that erratum 298
	 * is present (because we really don't know).
	 */
	if (osvw_len == 0 && boot_cpu_data.x86 == 0x10)
		vcpu->arch.osvw.status |= 1;
}

static void svm_init_os_visible_workarounds(void)
{
	u64 len, status;

	/*
	 * Get OS-Visible Workarounds (OSVW) bits.
	 *
	 * Note that it is possible to have a system with mixed processor
	 * revisions and therefore different OSVW bits. If bits are not the same
	 * on different processors then choose the worst case (i.e. if erratum
	 * is present on one processor and not on another then assume that the
	 * erratum is present everywhere).
	 *
	 * Note #2!  The OSVW MSRs are used to communciate that an erratum is
	 * NOT present!  Software must assume erratum as present if its bit is
	 * set in OSVW_STATUS *or* the bit number exceeds OSVW_ID_LENGTH.  If
	 * either RDMSR fails, simply zero out the length to treat all errata
	 * as being present.  Similarly, use the *minimum* length across all
	 * CPUs, not the maximum length.
	 *
	 * If the length is zero, then is KVM already treating all errata as
	 * being present and there's nothing left to do.
	 */
	if (!osvw_len)
		return;

	if (!this_cpu_has(X86_FEATURE_OSVW) ||
	    native_read_msr_safe(MSR_AMD64_OSVW_ID_LENGTH, &len) ||
	    native_read_msr_safe(MSR_AMD64_OSVW_STATUS, &status))
		len = status = 0;

	if (status == READ_ONCE(osvw_status) && len >= READ_ONCE(osvw_len))
		return;

	guard(spinlock)(&osvw_lock);

	if (len < osvw_len)
		osvw_len = len;
	osvw_status |= status;
	osvw_status &= (1ULL << osvw_len) - 1;
}

static bool __kvm_is_svm_supported(void)
{
	int cpu = smp_processor_id();
	struct cpuinfo_x86 *c = &cpu_data(cpu);

	if (c->x86_vendor != X86_VENDOR_AMD &&
	    c->x86_vendor != X86_VENDOR_HYGON) {
		pr_err("CPU %d isn't AMD or Hygon\n", cpu);
		return false;
	}

	if (!cpu_has(c, X86_FEATURE_SVM)) {
		pr_err("SVM not supported by CPU %d\n", cpu);
		return false;
	}

	if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) {
		pr_info("KVM is unsupported when running as an SEV guest\n");
		return false;
	}

	return true;
}

static bool kvm_is_svm_supported(void)
{
	bool supported;

	migrate_disable();
	supported = __kvm_is_svm_supported();
	migrate_enable();

	return supported;
}

static int svm_check_processor_compat(void)
{
	if (!__kvm_is_svm_supported())
		return -EIO;

	return 0;
}

static void __svm_write_tsc_multiplier(u64 multiplier)
{
	if (multiplier == __this_cpu_read(current_tsc_ratio))
		return;

	wrmsrq(MSR_AMD64_TSC_RATIO, multiplier);
	__this_cpu_write(current_tsc_ratio, multiplier);
}

static __always_inline struct sev_es_save_area *sev_es_host_save_area(struct svm_cpu_data *sd)
{
	return &sd->save_area->host_sev_es_save;
}

static void svm_emergency_disable_virtualization_cpu(void)
{
	wrmsrq(MSR_VM_HSAVE_PA, 0);
}

static void svm_disable_virtualization_cpu(void)
{
	/* Make sure we clean up behind us */
	if (tsc_scaling)
		__svm_write_tsc_multiplier(SVM_TSC_RATIO_DEFAULT);

	x86_virt_put_ref(X86_FEATURE_SVM);
	wrmsrq(MSR_VM_HSAVE_PA, 0);

	amd_pmu_disable_virt();
}

static int svm_enable_virtualization_cpu(void)
{

	struct svm_cpu_data *sd;
	int me = raw_smp_processor_id();
	int r;

	r = x86_virt_get_ref(X86_FEATURE_SVM);
	if (r)
		return r;

	sd = per_cpu_ptr(&svm_data, me);
	/*
	 * Bump the current asid_generation value to ensure any vCPU that
	 * previously ran on this CPU sees a stale generation and is forced
	 * to acquire a new ASID, preventing a latent ASID collision.
	 */
	sd->asid_generation++;
	sd->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1;
	sd->next_asid = sd->max_asid + 1;
	sd->min_asid = max_sev_asid + 1;

	wrmsrq(MSR_VM_HSAVE_PA, sd->save_area_pa);

	if (cpu_feature_enabled(X86_FEATURE_TSCRATEMSR)) {
		/*
		 * Set the default value, even if we don't use TSC scaling
		 * to avoid having stale value in the msr
		 */
		__svm_write_tsc_multiplier(SVM_TSC_RATIO_DEFAULT);
	}

	svm_init_os_visible_workarounds();

	svm_init_erratum_383();

	amd_pmu_enable_virt();

	return 0;
}

static void svm_cpu_uninit(int cpu)
{
	struct svm_cpu_data *sd = per_cpu_ptr(&svm_data, cpu);

	if (!sd->save_area)
		return;

	kfree(sd->sev_vmcbs);
	__free_page(__sme_pa_to_page(sd->save_area_pa));
	sd->save_area_pa = 0;
	sd->save_area = NULL;
}

static int svm_cpu_init(int cpu)
{
	struct svm_cpu_data *sd = per_cpu_ptr(&svm_data, cpu);
	struct page *save_area_page;
	int ret = -ENOMEM;

	memset(sd, 0, sizeof(struct svm_cpu_data));
	save_area_page = snp_safe_alloc_page_node(cpu_to_node(cpu), GFP_KERNEL);
	if (!save_area_page)
		return ret;

	ret = sev_cpu_init(sd);
	if (ret)
		goto free_save_area;

	sd->save_area = page_address(save_area_page);
	sd->save_area_pa = __sme_page_pa(save_area_page);
	return 0;

free_save_area:
	__free_page(save_area_page);
	return ret;

}

static void set_dr_intercepts(struct vcpu_svm *svm)
{
	struct vmcb *vmcb = svm->vmcb01.ptr;

	vmcb_set_intercept(&vmcb->control, INTERCEPT_DR0_READ);
	vmcb_set_intercept(&vmcb->control, INTERCEPT_DR1_READ);
	vmcb_set_intercept(&vmcb->control, INTERCEPT_DR2_READ);
	vmcb_set_intercept(&vmcb->control, INTERCEPT_DR3_READ);
	vmcb_set_intercept(&vmcb->control, INTERCEPT_DR4_READ);
	vmcb_set_intercept(&vmcb->control, INTERCEPT_DR5_READ);
	vmcb_set_intercept(&vmcb->control, INTERCEPT_DR6_READ);
	vmcb_set_intercept(&vmcb->control, INTERCEPT_DR0_WRITE);
	vmcb_set_intercept(&vmcb->control, INTERCEPT_DR1_WRITE);
	vmcb_set_intercept(&vmcb->control, INTERCEPT_DR2_WRITE);
	vmcb_set_intercept(&vmcb->control, INTERCEPT_DR3_WRITE);
	vmcb_set_intercept(&vmcb->control, INTERCEPT_DR4_WRITE);
	vmcb_set_intercept(&vmcb->control, INTERCEPT_DR5_WRITE);
	vmcb_set_intercept(&vmcb->control, INTERCEPT_DR6_WRITE);
	vmcb_set_intercept(&vmcb->control, INTERCEPT_DR7_READ);
	vmcb_set_intercept(&vmcb->control, INTERCEPT_DR7_WRITE);

	svm_mark_intercepts_dirty(svm);
}

static void clr_dr_intercepts(struct vcpu_svm *svm)
{
	struct vmcb *vmcb = svm->vmcb01.ptr;

	vmcb->control.intercepts[INTERCEPT_DR] = 0;

	svm_mark_intercepts_dirty(svm);
}

static bool msr_write_intercepted(struct vcpu_svm *svm, u32 msr)
{
	void *msrpm = __va(__sme_clr(svm->vmcb->control.msrpm_base_pa));

	return svm_test_msr_bitmap_write(msrpm, msr);
}

void svm_set_intercept_for_msr(struct kvm_vcpu *vcpu, u32 msr, int type, bool set)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	void *msrpm = svm->msrpm;

	/* Don't disable interception for MSRs userspace wants to handle. */
	if (type & MSR_TYPE_R) {
		if (!set && kvm_msr_allowed(vcpu, msr, KVM_MSR_FILTER_READ))
			svm_clear_msr_bitmap_read(msrpm, msr);
		else
			svm_set_msr_bitmap_read(msrpm, msr);
	}

	if (type & MSR_TYPE_W) {
		if (!set && kvm_msr_allowed(vcpu, msr, KVM_MSR_FILTER_WRITE))
			svm_clear_msr_bitmap_write(msrpm, msr);
		else
			svm_set_msr_bitmap_write(msrpm, msr);
	}

	svm_hv_vmcb_dirty_nested_enlightenments(vcpu);
	svm->nested.force_msr_bitmap_recalc = true;
}

void *svm_alloc_permissions_map(unsigned long size, gfp_t gfp_mask)
{
	unsigned int order = get_order(size);
	struct page *pages = alloc_pages(gfp_mask, order);
	void *pm;

	if (!pages)
		return NULL;

	/*
	 * Set all bits in the permissions map so that all MSR and I/O accesses
	 * are intercepted by default.
	 */
	pm = page_address(pages);
	memset(pm, 0xff, PAGE_SIZE * (1 << order));

	return pm;
}

static void svm_recalc_lbr_msr_intercepts(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	bool intercept = !(svm->vmcb->control.misc_ctl2 & SVM_MISC2_ENABLE_V_LBR);

	if (intercept == svm->lbr_msrs_intercepted)
		return;

	svm_set_intercept_for_msr(vcpu, MSR_IA32_LASTBRANCHFROMIP, MSR_TYPE_RW, intercept);
	svm_set_intercept_for_msr(vcpu, MSR_IA32_LASTBRANCHTOIP, MSR_TYPE_RW, intercept);
	svm_set_intercept_for_msr(vcpu, MSR_IA32_LASTINTFROMIP, MSR_TYPE_RW, intercept);
	svm_set_intercept_for_msr(vcpu, MSR_IA32_LASTINTTOIP, MSR_TYPE_RW, intercept);

	if (is_sev_es_guest(vcpu))
		svm_set_intercept_for_msr(vcpu, MSR_IA32_DEBUGCTLMSR, MSR_TYPE_RW, intercept);

	svm->lbr_msrs_intercepted = intercept;
}

void svm_vcpu_free_msrpm(void *msrpm)
{
	__free_pages(virt_to_page(msrpm), get_order(MSRPM_SIZE));
}

static void svm_recalc_pmu_msr_intercepts(struct kvm_vcpu *vcpu)
{
	bool intercept = !kvm_vcpu_has_mediated_pmu(vcpu);
	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
	int i;

	if (!enable_mediated_pmu)
		return;

	/* Legacy counters are always available for AMD CPUs with a PMU. */
	for (i = 0; i < min(pmu->nr_arch_gp_counters, AMD64_NUM_COUNTERS); i++)
		svm_set_intercept_for_msr(vcpu, MSR_K7_PERFCTR0 + i,
					  MSR_TYPE_RW, intercept);

	intercept |= !guest_cpu_cap_has(vcpu, X86_FEATURE_PERFCTR_CORE);
	for (i = 0; i < pmu->nr_arch_gp_counters; i++)
		svm_set_intercept_for_msr(vcpu, MSR_F15H_PERF_CTR + 2 * i,
					  MSR_TYPE_RW, intercept);

	for ( ; i < kvm_pmu_cap.num_counters_gp; i++)
		svm_enable_intercept_for_msr(vcpu, MSR_F15H_PERF_CTR + 2 * i,
					     MSR_TYPE_RW);

	intercept = kvm_need_perf_global_ctrl_intercept(vcpu);
	svm_set_intercept_for_msr(vcpu, MSR_AMD64_PERF_CNTR_GLOBAL_CTL,
				  MSR_TYPE_RW, intercept);
	svm_set_intercept_for_msr(vcpu, MSR_AMD64_PERF_CNTR_GLOBAL_STATUS,
				  MSR_TYPE_RW, intercept);
	svm_set_intercept_for_msr(vcpu, MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR,
				  MSR_TYPE_RW, intercept);
	svm_set_intercept_for_msr(vcpu, MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_SET,
				  MSR_TYPE_RW, intercept);
}

static void svm_recalc_msr_intercepts(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	svm_disable_intercept_for_msr(vcpu, MSR_STAR, MSR_TYPE_RW);
	svm_disable_intercept_for_msr(vcpu, MSR_IA32_SYSENTER_CS, MSR_TYPE_RW);

#ifdef CONFIG_X86_64
	svm_disable_intercept_for_msr(vcpu, MSR_GS_BASE, MSR_TYPE_RW);
	svm_disable_intercept_for_msr(vcpu, MSR_FS_BASE, MSR_TYPE_RW);
	svm_disable_intercept_for_msr(vcpu, MSR_KERNEL_GS_BASE, MSR_TYPE_RW);
	svm_disable_intercept_for_msr(vcpu, MSR_LSTAR, MSR_TYPE_RW);
	svm_disable_intercept_for_msr(vcpu, MSR_CSTAR, MSR_TYPE_RW);
	svm_disable_intercept_for_msr(vcpu, MSR_SYSCALL_MASK, MSR_TYPE_RW);
#endif

	if (lbrv)
		svm_recalc_lbr_msr_intercepts(vcpu);

	if (cpu_feature_enabled(X86_FEATURE_IBPB))
		svm_set_intercept_for_msr(vcpu, MSR_IA32_PRED_CMD, MSR_TYPE_W,
					  !guest_has_pred_cmd_msr(vcpu));

	if (cpu_feature_enabled(X86_FEATURE_FLUSH_L1D))
		svm_set_intercept_for_msr(vcpu, MSR_IA32_FLUSH_CMD, MSR_TYPE_W,
					  !guest_cpu_cap_has(vcpu, X86_FEATURE_FLUSH_L1D));

	/*
	 * Disable interception of SPEC_CTRL if KVM doesn't need to manually
	 * context switch the MSR (SPEC_CTRL is virtualized by the CPU), or if
	 * the guest has a non-zero SPEC_CTRL value, i.e. is likely actively
	 * using SPEC_CTRL.
	 */
	if (cpu_feature_enabled(X86_FEATURE_V_SPEC_CTRL))
		svm_set_intercept_for_msr(vcpu, MSR_IA32_SPEC_CTRL, MSR_TYPE_RW,
					  !guest_has_spec_ctrl_msr(vcpu));
	else
		svm_set_intercept_for_msr(vcpu, MSR_IA32_SPEC_CTRL, MSR_TYPE_RW,
					  !svm->spec_ctrl);

	/*
	 * Intercept SYSENTER_EIP and SYSENTER_ESP when emulating an Intel CPU,
	 * as AMD hardware only store 32 bits, whereas Intel CPUs track 64 bits.
	 */
	svm_set_intercept_for_msr(vcpu, MSR_IA32_SYSENTER_EIP, MSR_TYPE_RW,
				  guest_cpuid_is_intel_compatible(vcpu));
	svm_set_intercept_for_msr(vcpu, MSR_IA32_SYSENTER_ESP, MSR_TYPE_RW,
				  guest_cpuid_is_intel_compatible(vcpu));

	if (kvm_aperfmperf_in_guest(vcpu->kvm)) {
		svm_disable_intercept_for_msr(vcpu, MSR_IA32_APERF, MSR_TYPE_R);
		svm_disable_intercept_for_msr(vcpu, MSR_IA32_MPERF, MSR_TYPE_R);
	}

	if (kvm_cpu_cap_has(X86_FEATURE_SHSTK)) {
		bool shstk_enabled = guest_cpu_cap_has(vcpu, X86_FEATURE_SHSTK);

		svm_set_intercept_for_msr(vcpu, MSR_IA32_U_CET, MSR_TYPE_RW, !shstk_enabled);
		svm_set_intercept_for_msr(vcpu, MSR_IA32_S_CET, MSR_TYPE_RW, !shstk_enabled);
		svm_set_intercept_for_msr(vcpu, MSR_IA32_PL0_SSP, MSR_TYPE_RW, !shstk_enabled);
		svm_set_intercept_for_msr(vcpu, MSR_IA32_PL1_SSP, MSR_TYPE_RW, !shstk_enabled);
		svm_set_intercept_for_msr(vcpu, MSR_IA32_PL2_SSP, MSR_TYPE_RW, !shstk_enabled);
		svm_set_intercept_for_msr(vcpu, MSR_IA32_PL3_SSP, MSR_TYPE_RW, !shstk_enabled);
	}

	if (is_sev_es_guest(vcpu))
		sev_es_recalc_msr_intercepts(vcpu);

	svm_recalc_pmu_msr_intercepts(vcpu);

	/*
	 * x2APIC intercepts are modified on-demand and cannot be filtered by
	 * userspace.
	 */
}

static void __svm_enable_lbrv(struct kvm_vcpu *vcpu)
{
	to_svm(vcpu)->vmcb->control.misc_ctl2 |= SVM_MISC2_ENABLE_V_LBR;
}

void svm_enable_lbrv(struct kvm_vcpu *vcpu)
{
	__svm_enable_lbrv(vcpu);
	svm_recalc_lbr_msr_intercepts(vcpu);
}

static void __svm_disable_lbrv(struct kvm_vcpu *vcpu)
{
	KVM_BUG_ON(is_sev_es_guest(vcpu), vcpu->kvm);
	to_svm(vcpu)->vmcb->control.misc_ctl2 &= ~SVM_MISC2_ENABLE_V_LBR;
}

void svm_update_lbrv(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	bool current_enable_lbrv = svm->vmcb->control.misc_ctl2 & SVM_MISC2_ENABLE_V_LBR;
	bool enable_lbrv = (svm->vmcb->save.dbgctl & DEBUGCTLMSR_LBR) ||
			    (is_guest_mode(vcpu) && guest_cpu_cap_has(vcpu, X86_FEATURE_LBRV) &&
			    (svm->nested.ctl.misc_ctl2 & SVM_MISC2_ENABLE_V_LBR));

	if (enable_lbrv && !current_enable_lbrv)
		__svm_enable_lbrv(vcpu);
	else if (!enable_lbrv && current_enable_lbrv)
		__svm_disable_lbrv(vcpu);

	/*
	 * During nested transitions, it is possible that the current VMCB has
	 * LBR_CTL set, but the previous LBR_CTL had it cleared (or vice versa).
	 * In this case, even though LBR_CTL does not need an update, intercepts
	 * do, so always recalculate the intercepts here.
	 */
	svm_recalc_lbr_msr_intercepts(vcpu);
}

void disable_nmi_singlestep(struct vcpu_svm *svm)
{
	svm->nmi_singlestep = false;

	if (!(svm->vcpu.guest_debug & KVM_GUESTDBG_SINGLESTEP)) {
		/* Clear our flags if they were not set by the guest */
		if (!(svm->nmi_singlestep_guest_rflags & X86_EFLAGS_TF))
			svm->vmcb->save.rflags &= ~X86_EFLAGS_TF;
		if (!(svm->nmi_singlestep_guest_rflags & X86_EFLAGS_RF))
			svm->vmcb->save.rflags &= ~X86_EFLAGS_RF;
	}
}

static void grow_ple_window(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb_control_area *control = &svm->vmcb->control;
	int old = control->pause_filter_count;

	/* Adjusting pause_filter_count makes no sense if PLE is disabled.  */
	WARN_ON_ONCE(kvm_pause_in_guest(vcpu->kvm));

	/*
	 * While running L2, KVM should intercept PAUSE if and only if L1 wants
	 * to intercept PAUSE, and L1's intercept should take priority, i.e.
	 * KVM should never handle a PAUSE intercept from L2.
	 */
	if (WARN_ON_ONCE(is_guest_mode(vcpu)))
		return;

	control->pause_filter_count = __grow_ple_window(old,
							pause_filter_count,
							pause_filter_count_grow,
							pause_filter_count_max);

	if (control->pause_filter_count != old) {
		vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
		trace_kvm_ple_window_update(vcpu->vcpu_id,
					    control->pause_filter_count, old);
	}
}

static void shrink_ple_window(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb_control_area *control = &svm->vmcb->control;
	int old = control->pause_filter_count;

	/* Adjusting pause_filter_count makes no sense if PLE is disabled.  */
	WARN_ON_ONCE(kvm_pause_in_guest(vcpu->kvm));

	if (is_guest_mode(vcpu))
		return;

	control->pause_filter_count =
				__shrink_ple_window(old,
						    pause_filter_count,
						    pause_filter_count_shrink,
						    pause_filter_count);
	if (control->pause_filter_count != old) {
		vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
		trace_kvm_ple_window_update(vcpu->vcpu_id,
					    control->pause_filter_count, old);
	}
}

static void svm_hardware_unsetup(void)
{
	int cpu;

	avic_hardware_unsetup();

	sev_hardware_unsetup();

	for_each_possible_cpu(cpu)
		svm_cpu_uninit(cpu);

	__free_pages(__sme_pa_to_page(iopm_base), get_order(IOPM_SIZE));
	iopm_base = 0;
}

static void init_seg(struct vmcb_seg *seg)
{
	seg->selector = 0;
	seg->attrib = SVM_SELECTOR_P_MASK | SVM_SELECTOR_S_MASK |
		      SVM_SELECTOR_WRITE_MASK; /* Read/Write Data Segment */
	seg->limit = 0xffff;
	seg->base = 0;
}

static void init_sys_seg(struct vmcb_seg *seg, uint32_t type)
{
	seg->selector = 0;
	seg->attrib = SVM_SELECTOR_P_MASK | type;
	seg->limit = 0xffff;
	seg->base = 0;
}

static u64 svm_get_l2_tsc_offset(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	return svm->nested.ctl.tsc_offset;
}

static u64 svm_get_l2_tsc_multiplier(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	return svm->tsc_ratio_msr;
}

static void svm_write_tsc_offset(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	svm->vmcb01.ptr->control.tsc_offset = vcpu->arch.l1_tsc_offset;
	svm->vmcb->control.tsc_offset = vcpu->arch.tsc_offset;
	vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
}

void svm_write_tsc_multiplier(struct kvm_vcpu *vcpu)
{
	preempt_disable();
	if (to_svm(vcpu)->guest_state_loaded)
		__svm_write_tsc_multiplier(vcpu->arch.tsc_scaling_ratio);
	preempt_enable();
}

static bool svm_has_pending_gif_event(struct vcpu_svm *svm)
{
	return svm->vcpu.arch.smi_pending ||
	       svm->vcpu.arch.nmi_pending ||
	       kvm_cpu_has_injectable_intr(&svm->vcpu) ||
	       kvm_apic_has_pending_init_or_sipi(&svm->vcpu);
}

/* Evaluate instruction intercepts that depend on guest CPUID features. */
static void svm_recalc_instruction_intercepts(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	/*
	 * Intercept INVPCID if shadow paging is enabled to sync/free shadow
	 * roots, or if INVPCID is disabled in the guest to inject #UD.
	 */
	if (kvm_cpu_cap_has(X86_FEATURE_INVPCID)) {
		if (!npt_enabled ||
		    !guest_cpu_cap_has(&svm->vcpu, X86_FEATURE_INVPCID))
			svm_set_intercept(svm, INTERCEPT_INVPCID);
		else
			svm_clr_intercept(svm, INTERCEPT_INVPCID);
	}

	if (kvm_cpu_cap_has(X86_FEATURE_RDTSCP)) {
		if (guest_cpu_cap_has(vcpu, X86_FEATURE_RDTSCP))
			svm_clr_intercept(svm, INTERCEPT_RDTSCP);
		else
			svm_set_intercept(svm, INTERCEPT_RDTSCP);
	}

	/*
	 * Intercept instructions that #UD if EFER.SVME=0, as SVME must be set
	 * even when running the guest, i.e. hardware will only ever see
	 * EFER.SVME=1.
	 *
	 * No need to toggle any of the vgif/vls/etc. enable bits here, as they
	 * are set when the VMCB is initialized and never cleared (if the
	 * relevant intercepts are set, the enablements are meaningless anyway).
	 *
	 * FIXME: When #GP is not intercepted, a #GP on these instructions (e.g.
	 * due to CPL > 0) could be injected by hardware before the instruction
	 * is intercepted, leading to #GP taking precedence over #UD from the
	 * guest's perspective.
	 */
	if (!(vcpu->arch.efer & EFER_SVME)) {
		svm_set_intercept(svm, INTERCEPT_VMLOAD);
		svm_set_intercept(svm, INTERCEPT_VMSAVE);
		svm_set_intercept(svm, INTERCEPT_CLGI);
		svm_set_intercept(svm, INTERCEPT_STGI);
	} else {
		/*
		 * If hardware supports Virtual VMLOAD VMSAVE then enable it
		 * in VMCB and clear intercepts to avoid #VMEXIT.
		 */
		if (guest_cpuid_is_intel_compatible(vcpu)) {
			svm_set_intercept(svm, INTERCEPT_VMLOAD);
			svm_set_intercept(svm, INTERCEPT_VMSAVE);
		} else if (vls) {
			svm_clr_intercept(svm, INTERCEPT_VMLOAD);
			svm_clr_intercept(svm, INTERCEPT_VMSAVE);
		}

		/*
		 * Process pending events when clearing STGI/CLGI intercepts if
		 * there's at least one pending event that is masked by GIF, so
		 * that KVM re-evaluates if the intercept needs to be set again
		 * to track when GIF is re-enabled (e.g. for NMI injection).
		 */
		if (vgif) {
			svm_clr_intercept(svm, INTERCEPT_CLGI);
			svm_clr_intercept(svm, INTERCEPT_STGI);

			if (svm_has_pending_gif_event(svm))
				kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
		}
	}

	if (kvm_need_rdpmc_intercept(vcpu))
		svm_set_intercept(svm, INTERCEPT_RDPMC);
	else
		svm_clr_intercept(svm, INTERCEPT_RDPMC);
}

static void svm_recalc_intercepts(struct kvm_vcpu *vcpu)
{
	svm_recalc_instruction_intercepts(vcpu);
	svm_recalc_msr_intercepts(vcpu);
}

static void init_vmcb(struct kvm_vcpu *vcpu, bool init_event)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb *vmcb = svm->vmcb01.ptr;
	struct vmcb_control_area *control = &vmcb->control;
	struct vmcb_save_area *save = &vmcb->save;

	svm_set_intercept(svm, INTERCEPT_CR0_READ);
	svm_set_intercept(svm, INTERCEPT_CR3_READ);
	svm_set_intercept(svm, INTERCEPT_CR4_READ);
	svm_set_intercept(svm, INTERCEPT_CR0_WRITE);
	svm_set_intercept(svm, INTERCEPT_CR3_WRITE);
	svm_set_intercept(svm, INTERCEPT_CR4_WRITE);
	svm_set_intercept(svm, INTERCEPT_CR8_WRITE);

	set_dr_intercepts(svm);

	set_exception_intercept(svm, PF_VECTOR);
	set_exception_intercept(svm, UD_VECTOR);
	set_exception_intercept(svm, MC_VECTOR);
	set_exception_intercept(svm, AC_VECTOR);
	set_exception_intercept(svm, DB_VECTOR);
	/*
	 * Guest access to VMware backdoor ports could legitimately
	 * trigger #GP because of TSS I/O permission bitmap.
	 * We intercept those #GP and allow access to them anyway
	 * as VMware does.
	 */
	if (enable_vmware_backdoor)
		set_exception_intercept(svm, GP_VECTOR);

	svm_set_intercept(svm, INTERCEPT_INTR);
	svm_set_intercept(svm, INTERCEPT_NMI);

	if (intercept_smi)
		svm_set_intercept(svm, INTERCEPT_SMI);

	svm_set_intercept(svm, INTERCEPT_SELECTIVE_CR0);
	svm_set_intercept(svm, INTERCEPT_RDPMC);
	svm_set_intercept(svm, INTERCEPT_CPUID);
	svm_set_intercept(svm, INTERCEPT_INVD);
	svm_set_intercept(svm, INTERCEPT_INVLPG);
	svm_set_intercept(svm, INTERCEPT_INVLPGA);
	svm_set_intercept(svm, INTERCEPT_IOIO_PROT);
	svm_set_intercept(svm, INTERCEPT_MSR_PROT);
	svm_set_intercept(svm, INTERCEPT_TASK_SWITCH);
	svm_set_intercept(svm, INTERCEPT_SHUTDOWN);
	svm_set_intercept(svm, INTERCEPT_VMRUN);
	svm_set_intercept(svm, INTERCEPT_VMMCALL);
	svm_set_intercept(svm, INTERCEPT_VMLOAD);
	svm_set_intercept(svm, INTERCEPT_VMSAVE);
	svm_set_intercept(svm, INTERCEPT_STGI);
	svm_set_intercept(svm, INTERCEPT_CLGI);
	svm_set_intercept(svm, INTERCEPT_SKINIT);
	svm_set_intercept(svm, INTERCEPT_WBINVD);
	svm_set_intercept(svm, INTERCEPT_XSETBV);
	svm_set_intercept(svm, INTERCEPT_ICEBP);
	svm_set_intercept(svm, INTERCEPT_RDPRU);
	svm_set_intercept(svm, INTERCEPT_RSM);

	if (!kvm_mwait_in_guest(vcpu->kvm)) {
		svm_set_intercept(svm, INTERCEPT_MONITOR);
		svm_set_intercept(svm, INTERCEPT_MWAIT);
	}

	if (!kvm_hlt_in_guest(vcpu->kvm)) {
		if (cpu_feature_enabled(X86_FEATURE_IDLE_HLT))
			svm_set_intercept(svm, INTERCEPT_IDLE_HLT);
		else
			svm_set_intercept(svm, INTERCEPT_HLT);
	}

	control->iopm_base_pa = iopm_base;
	control->msrpm_base_pa = __sme_set(__pa(svm->msrpm));
	control->int_ctl = V_INTR_MASKING_MASK;

	init_seg(&save->es);
	init_seg(&save->ss);
	init_seg(&save->ds);
	init_seg(&save->fs);
	init_seg(&save->gs);

	save->cs.selector = 0xf000;
	save->cs.base = 0xffff0000;
	/* Executable/Readable Code Segment */
	save->cs.attrib = SVM_SELECTOR_READ_MASK | SVM_SELECTOR_P_MASK |
		SVM_SELECTOR_S_MASK | SVM_SELECTOR_CODE_MASK;
	save->cs.limit = 0xffff;

	save->gdtr.base = 0;
	save->gdtr.limit = 0xffff;
	save->idtr.base = 0;
	save->idtr.limit = 0xffff;

	init_sys_seg(&save->ldtr, SEG_TYPE_LDT);
	init_sys_seg(&save->tr, SEG_TYPE_BUSY_TSS16);

	if (npt_enabled) {
		/* Setup VMCB for Nested Paging */
		control->misc_ctl |= SVM_MISC_ENABLE_NP;
		svm_clr_intercept(svm, INTERCEPT_INVLPG);
		clr_exception_intercept(svm, PF_VECTOR);
		svm_clr_intercept(svm, INTERCEPT_CR3_READ);
		svm_clr_intercept(svm, INTERCEPT_CR3_WRITE);
		save->g_pat = vcpu->arch.pat;
		save->cr3 = 0;
	}

	if (gmet_enabled)
		control->misc_ctl |= SVM_MISC_ENABLE_GMET;

	svm->current_vmcb->asid_generation = 0;
	svm->asid = 0;

	svm->nested.vmcb12_gpa = INVALID_GPA;
	svm->nested.last_vmcb12_gpa = INVALID_GPA;

	if (!kvm_pause_in_guest(vcpu->kvm)) {
		control->pause_filter_count = pause_filter_count;
		if (pause_filter_thresh)
			control->pause_filter_thresh = pause_filter_thresh;
		svm_set_intercept(svm, INTERCEPT_PAUSE);
	} else {
		svm_clr_intercept(svm, INTERCEPT_PAUSE);
	}

	if (guest_cpu_cap_has(vcpu, X86_FEATURE_ERAPS))
		svm->vmcb->control.erap_ctl |= ERAP_CONTROL_ALLOW_LARGER_RAP;

	if (enable_apicv && irqchip_in_kernel(vcpu->kvm))
		avic_init_vmcb(svm, vmcb);

	if (vnmi)
		svm->vmcb->control.int_ctl |= V_NMI_ENABLE_MASK;

	if (vgif)
		svm->vmcb->control.int_ctl |= V_GIF_ENABLE_MASK;

	if (vls)
		svm->vmcb->control.misc_ctl2 |= SVM_MISC2_ENABLE_V_VMLOAD_VMSAVE;

	if (vcpu->kvm->arch.bus_lock_detection_enabled)
		svm_set_intercept(svm, INTERCEPT_BUSLOCK);

	if (is_sev_guest(vcpu))
		sev_init_vmcb(svm, init_event);

	svm_hv_init_vmcb(vmcb);

	kvm_make_request(KVM_REQ_RECALC_INTERCEPTS, vcpu);

	vmcb_mark_all_dirty(vmcb);

	enable_gif(svm);
}

static void __svm_vcpu_reset(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	svm_init_osvw(vcpu);

	if (kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_STUFF_FEATURE_MSRS))
		vcpu->arch.microcode_version = 0x01000065;
	svm->tsc_ratio_msr = kvm_caps.default_tsc_scaling_ratio;

	svm->nmi_masked = false;
	svm->awaiting_iret_completion = false;
}

static void svm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	svm->spec_ctrl = 0;
	svm->virt_spec_ctrl = 0;

	init_vmcb(vcpu, init_event);

	if (!init_event)
		__svm_vcpu_reset(vcpu);
}

void svm_switch_vmcb(struct vcpu_svm *svm, struct kvm_vmcb_info *target_vmcb)
{
	svm->current_vmcb = target_vmcb;
	svm->vmcb = target_vmcb->ptr;
}

static int svm_vcpu_create(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm;
	struct page *vmcb01_page;
	int err;

	BUILD_BUG_ON(offsetof(struct vcpu_svm, vcpu) != 0);
	svm = to_svm(vcpu);

	err = -ENOMEM;
	vmcb01_page = snp_safe_alloc_page();
	if (!vmcb01_page)
		goto out;

	err = sev_vcpu_create(vcpu);
	if (err)
		goto error_free_vmcb_page;

	err = avic_init_vcpu(svm);
	if (err)
		goto error_free_sev;

	svm->msrpm = svm_vcpu_alloc_msrpm();
	if (!svm->msrpm) {
		err = -ENOMEM;
		goto error_free_avic;
	}

	svm->x2avic_msrs_intercepted = true;
	svm->lbr_msrs_intercepted = true;

	svm->vmcb01.ptr = page_address(vmcb01_page);
	svm->vmcb01.pa = __sme_set(page_to_pfn(vmcb01_page) << PAGE_SHIFT);
	svm_switch_vmcb(svm, &svm->vmcb01);

	svm->guest_state_loaded = false;

	return 0;

error_free_avic:
	avic_vcpu_free(vcpu);
error_free_sev:
	sev_free_vcpu(vcpu);
error_free_vmcb_page:
	__free_page(vmcb01_page);
out:
	return err;
}

static void svm_vcpu_free(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	WARN_ON_ONCE(!list_empty(&svm->ir_list));

	avic_vcpu_free(vcpu);

	svm_leave_nested(vcpu);
	svm_free_nested(svm);

	sev_free_vcpu(vcpu);

	__free_page(__sme_pa_to_page(svm->vmcb01.pa));
	svm_vcpu_free_msrpm(svm->msrpm);
}

#ifdef CONFIG_CPU_MITIGATIONS
static DEFINE_SPINLOCK(srso_lock);
static atomic_t srso_nr_vms;

static void svm_srso_clear_bp_spec_reduce(void *ign)
{
	struct svm_cpu_data *sd = this_cpu_ptr(&svm_data);

	if (!sd->bp_spec_reduce_set)
		return;

	msr_clear_bit(MSR_ZEN4_BP_CFG, MSR_ZEN4_BP_CFG_BP_SPEC_REDUCE_BIT);
	sd->bp_spec_reduce_set = false;
}

static void svm_srso_vm_destroy(void)
{
	if (!cpu_feature_enabled(X86_FEATURE_SRSO_BP_SPEC_REDUCE))
		return;

	if (atomic_dec_return(&srso_nr_vms))
		return;

	guard(spinlock)(&srso_lock);

	/*
	 * Verify a new VM didn't come along, acquire the lock, and increment
	 * the count before this task acquired the lock.
	 */
	if (atomic_read(&srso_nr_vms))
		return;

	on_each_cpu(svm_srso_clear_bp_spec_reduce, NULL, 1);
}

static void svm_srso_vm_init(void)
{
	if (!cpu_feature_enabled(X86_FEATURE_SRSO_BP_SPEC_REDUCE))
		return;

	/*
	 * Acquire the lock on 0 => 1 transitions to ensure a potential 1 => 0
	 * transition, i.e. destroying the last VM, is fully complete, e.g. so
	 * that a delayed IPI doesn't clear BP_SPEC_REDUCE after a vCPU runs.
	 */
	if (atomic_inc_not_zero(&srso_nr_vms))
		return;

	guard(spinlock)(&srso_lock);

	atomic_inc(&srso_nr_vms);
}
#else
static void svm_srso_vm_init(void) { }
static void svm_srso_vm_destroy(void) { }
#endif

static void svm_prepare_switch_to_guest(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct svm_cpu_data *sd = per_cpu_ptr(&svm_data, vcpu->cpu);

	if (is_sev_es_guest(vcpu))
		sev_es_unmap_ghcb(svm);

	if (svm->guest_state_loaded)
		return;

	/*
	 * Save additional host state that will be restored on VMEXIT (sev-es)
	 * or subsequent vmload of host save area.
	 */
	vmsave(sd->save_area_pa);
	if (is_sev_es_guest(vcpu))
		sev_es_prepare_switch_to_guest(svm, sev_es_host_save_area(sd));

	if (tsc_scaling)
		__svm_write_tsc_multiplier(vcpu->arch.tsc_scaling_ratio);

	/*
	 * TSC_AUX is always virtualized (context switched by hardware) for
	 * SEV-ES guests when the feature is available.  For non-SEV-ES guests,
	 * context switch TSC_AUX via the user_return MSR infrastructure (not
	 * all CPUs support TSC_AUX virtualization).
	 */
	if (likely(tsc_aux_uret_slot >= 0) &&
	    (!boot_cpu_has(X86_FEATURE_V_TSC_AUX) || !is_sev_es_guest(vcpu)))
		kvm_set_user_return_msr(tsc_aux_uret_slot, svm->tsc_aux, -1ull);

	if (cpu_feature_enabled(X86_FEATURE_SRSO_BP_SPEC_REDUCE) &&
	    !sd->bp_spec_reduce_set) {
		sd->bp_spec_reduce_set = true;
		msr_set_bit(MSR_ZEN4_BP_CFG, MSR_ZEN4_BP_CFG_BP_SPEC_REDUCE_BIT);
	}
	svm->guest_state_loaded = true;
}

static void svm_prepare_host_switch(struct kvm_vcpu *vcpu)
{
	to_svm(vcpu)->guest_state_loaded = false;
}

static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
	if (vcpu->scheduled_out && !kvm_pause_in_guest(vcpu->kvm))
		shrink_ple_window(vcpu);

	if (kvm_vcpu_apicv_active(vcpu))
		avic_vcpu_load(vcpu, cpu);
}

static void svm_vcpu_put(struct kvm_vcpu *vcpu)
{
	if (kvm_vcpu_apicv_active(vcpu))
		avic_vcpu_put(vcpu);

	svm_prepare_host_switch(vcpu);

	++vcpu->stat.host_state_reload;
}

static unsigned long svm_get_rflags(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	unsigned long rflags = svm->vmcb->save.rflags;

	if (svm->nmi_singlestep) {
		/* Hide our flags if they were not set by the guest */
		if (!(svm->nmi_singlestep_guest_rflags & X86_EFLAGS_TF))
			rflags &= ~X86_EFLAGS_TF;
		if (!(svm->nmi_singlestep_guest_rflags & X86_EFLAGS_RF))
			rflags &= ~X86_EFLAGS_RF;
	}
	return rflags;
}

static void svm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
{
	if (to_svm(vcpu)->nmi_singlestep)
		rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);

       /*
        * Any change of EFLAGS.VM is accompanied by a reload of SS
        * (caused by either a task switch or an inter-privilege IRET),
        * so we do not need to update the CPL here.
        */
	to_svm(vcpu)->vmcb->save.rflags = rflags;
}

static bool svm_get_if_flag(struct kvm_vcpu *vcpu)
{
	struct vmcb *vmcb = to_svm(vcpu)->vmcb;

	return is_sev_es_guest(vcpu)
		? vmcb->control.int_state & SVM_GUEST_INTERRUPT_MASK
		: kvm_get_rflags(vcpu) & X86_EFLAGS_IF;
}

static void svm_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
{
	kvm_register_mark_available(vcpu, reg);

	switch (reg) {
	case VCPU_REG_PDPTR:
		/*
		 * When !npt_enabled, vcpu->pdptrs[] is already available since
		 * it is always updated per SDM when moving to CRs.
		 */
		if (npt_enabled)
			load_pdptrs(vcpu, kvm_read_cr3(vcpu));
		break;
	default:
		KVM_BUG_ON(1, vcpu->kvm);
	}
}

static void svm_set_vintr(struct vcpu_svm *svm)
{
	struct vmcb_control_area *control;

	/*
	 * The following fields are ignored when AVIC is enabled
	 */
	WARN_ON(kvm_vcpu_apicv_activated(&svm->vcpu));

	svm_set_intercept(svm, INTERCEPT_VINTR);

	/*
	 * Recalculating intercepts may have cleared the VINTR intercept.  If
	 * V_INTR_MASKING is enabled in vmcb12, then the effective RFLAGS.IF
	 * for L1 physical interrupts is L1's RFLAGS.IF at the time of VMRUN.
	 * Requesting an interrupt window if save.RFLAGS.IF=0 is pointless as
	 * interrupts will never be unblocked while L2 is running.
	 */
	if (!svm_is_intercept(svm, INTERCEPT_VINTR))
		return;

	/*
	 * This is just a dummy VINTR to actually cause a vmexit to happen.
	 * Actual injection of virtual interrupts happens through EVENTINJ.
	 */
	control = &svm->vmcb->control;
	control->int_vector = 0x0;
	control->int_ctl &= ~V_INTR_PRIO_MASK;
	control->int_ctl |= V_IRQ_MASK |
		((/*control->int_vector >> 4*/ 0xf) << V_INTR_PRIO_SHIFT);
	vmcb_mark_dirty(svm->vmcb, VMCB_INTR);
}

static void svm_clear_vintr(struct vcpu_svm *svm)
{
	svm_clr_intercept(svm, INTERCEPT_VINTR);

	/* Drop int_ctl fields related to VINTR injection.  */
	svm->vmcb->control.int_ctl &= ~V_IRQ_INJECTION_BITS_MASK;
	if (is_guest_mode(&svm->vcpu)) {
		svm->vmcb01.ptr->control.int_ctl &= ~V_IRQ_INJECTION_BITS_MASK;

		WARN_ON((svm->vmcb->control.int_ctl & V_TPR_MASK) !=
			(svm->nested.ctl.int_ctl & V_TPR_MASK));

		svm->vmcb->control.int_ctl |= svm->nested.ctl.int_ctl &
			V_IRQ_INJECTION_BITS_MASK;

		svm->vmcb->control.int_vector = svm->nested.ctl.int_vector;
	}

	vmcb_mark_dirty(svm->vmcb, VMCB_INTR);
}

static struct vmcb_seg *svm_seg(struct kvm_vcpu *vcpu, int seg)
{
	struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;
	struct vmcb_save_area *save01 = &to_svm(vcpu)->vmcb01.ptr->save;

	switch (seg) {
	case VCPU_SREG_CS: return &save->cs;
	case VCPU_SREG_DS: return &save->ds;
	case VCPU_SREG_ES: return &save->es;
	case VCPU_SREG_FS: return &save01->fs;
	case VCPU_SREG_GS: return &save01->gs;
	case VCPU_SREG_SS: return &save->ss;
	case VCPU_SREG_TR: return &save01->tr;
	case VCPU_SREG_LDTR: return &save01->ldtr;
	}
	BUG();
	return NULL;
}

static u64 svm_get_segment_base(struct kvm_vcpu *vcpu, int seg)
{
	struct vmcb_seg *s = svm_seg(vcpu, seg);

	return s->base;
}

static void svm_get_segment(struct kvm_vcpu *vcpu,
			    struct kvm_segment *var, int seg)
{
	struct vmcb_seg *s = svm_seg(vcpu, seg);

	var->base = s->base;
	var->limit = s->limit;
	var->selector = s->selector;
	var->type = s->attrib & SVM_SELECTOR_TYPE_MASK;
	var->s = (s->attrib >> SVM_SELECTOR_S_SHIFT) & 1;
	var->dpl = (s->attrib >> SVM_SELECTOR_DPL_SHIFT) & 3;
	var->present = (s->attrib >> SVM_SELECTOR_P_SHIFT) & 1;
	var->avl = (s->attrib >> SVM_SELECTOR_AVL_SHIFT) & 1;
	var->l = (s->attrib >> SVM_SELECTOR_L_SHIFT) & 1;
	var->db = (s->attrib >> SVM_SELECTOR_DB_SHIFT) & 1;

	/*
	 * AMD CPUs circa 2014 track the G bit for all segments except CS.
	 * However, the SVM spec states that the G bit is not observed by the
	 * CPU, and some VMware virtual CPUs drop the G bit for all segments.
	 * So let's synthesize a legal G bit for all segments, this helps
	 * running KVM nested. It also helps cross-vendor migration, because
	 * Intel's vmentry has a check on the 'G' bit.
	 */
	var->g = s->limit > 0xfffff;

	/*
	 * AMD's VMCB does not have an explicit unusable field, so emulate it
	 * for cross vendor migration purposes by "not present"
	 */
	var->unusable = !var->present;

	switch (seg) {
	case VCPU_SREG_TR:
		/*
		 * Work around a bug where the busy flag in the tr selector
		 * isn't exposed
		 */
		var->type |= 0x2;
		break;
	case VCPU_SREG_DS:
	case VCPU_SREG_ES:
	case VCPU_SREG_FS:
	case VCPU_SREG_GS:
		/*
		 * The accessed bit must always be set in the segment
		 * descriptor cache, although it can be cleared in the
		 * descriptor, the cached bit always remains at 1. Since
		 * Intel has a check on this, set it here to support
		 * cross-vendor migration.
		 */
		if (!var->unusable)
			var->type |= 0x1;
		break;
	case VCPU_SREG_SS:
		/*
		 * On AMD CPUs sometimes the DB bit in the segment
		 * descriptor is left as 1, although the whole segment has
		 * been made unusable. Clear it here to pass an Intel VMX
		 * entry check when cross vendor migrating.
		 */
		if (var->unusable)
			var->db = 0;
		/* This is symmetric with svm_set_segment() */
		var->dpl = to_svm(vcpu)->vmcb->save.cpl;
		break;
	}
}

static int svm_get_cpl(struct kvm_vcpu *vcpu)
{
	struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;

	return save->cpl;
}

static void svm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
{
	struct kvm_segment cs;

	svm_get_segment(vcpu, &cs, VCPU_SREG_CS);
	*db = cs.db;
	*l = cs.l;
}

static void svm_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	dt->size = svm->vmcb->save.idtr.limit;
	dt->address = svm->vmcb->save.idtr.base;
}

static void svm_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	svm->vmcb->save.idtr.limit = dt->size;
	svm->vmcb->save.idtr.base = dt->address ;
	vmcb_mark_dirty(svm->vmcb, VMCB_DT);
}

static void svm_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	dt->size = svm->vmcb->save.gdtr.limit;
	dt->address = svm->vmcb->save.gdtr.base;
}

static void svm_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	svm->vmcb->save.gdtr.limit = dt->size;
	svm->vmcb->save.gdtr.base = dt->address ;
	vmcb_mark_dirty(svm->vmcb, VMCB_DT);
}

static void sev_post_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	/*
	 * For guests that don't set guest_state_protected, the cr3 update is
	 * handled via kvm_mmu_load() while entering the guest. For guests
	 * that do (SEV-ES/SEV-SNP), the cr3 update needs to be written to
	 * VMCB save area now, since the save area will become the initial
	 * contents of the VMSA, and future VMCB save area updates won't be
	 * seen.
	 */
	if (is_sev_es_guest(vcpu)) {
		svm->vmcb->save.cr3 = cr3;
		vmcb_mark_dirty(svm->vmcb, VMCB_CR);
	}
}

static bool svm_is_valid_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
{
	return true;
}

void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	u64 hcr0 = cr0;
	bool old_paging = is_paging(vcpu);

#ifdef CONFIG_X86_64
	if (vcpu->arch.efer & EFER_LME) {
		if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
			vcpu->arch.efer |= EFER_LMA;
			if (!vcpu->arch.guest_state_protected)
				svm->vmcb->save.efer |= EFER_LMA | EFER_LME;
		}

		if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) {
			vcpu->arch.efer &= ~EFER_LMA;
			if (!vcpu->arch.guest_state_protected)
				svm->vmcb->save.efer &= ~(EFER_LMA | EFER_LME);
		}
	}
#endif
	vcpu->arch.cr0 = cr0;

	if (!npt_enabled) {
		hcr0 |= X86_CR0_PG | X86_CR0_WP;
		if (old_paging != is_paging(vcpu))
			svm_set_cr4(vcpu, kvm_read_cr4(vcpu));
	}

	/*
	 * re-enable caching here because the QEMU bios
	 * does not do it - this results in some delay at
	 * reboot
	 */
	if (kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_CD_NW_CLEARED))
		hcr0 &= ~(X86_CR0_CD | X86_CR0_NW);

	svm->vmcb->save.cr0 = hcr0;
	vmcb_mark_dirty(svm->vmcb, VMCB_CR);

	/*
	 * SEV-ES guests must always keep the CR intercepts cleared. CR
	 * tracking is done using the CR write traps.
	 */
	if (is_sev_es_guest(vcpu))
		return;

	if (hcr0 == cr0) {
		/* Selective CR0 write remains on.  */
		svm_clr_intercept(svm, INTERCEPT_CR0_READ);
		svm_clr_intercept(svm, INTERCEPT_CR0_WRITE);
	} else {
		svm_set_intercept(svm, INTERCEPT_CR0_READ);
		svm_set_intercept(svm, INTERCEPT_CR0_WRITE);
	}
}

static bool svm_is_valid_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
{
	return true;
}

void svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
{
	unsigned long host_cr4_mce = cr4_read_shadow() & X86_CR4_MCE;
	unsigned long old_cr4 = vcpu->arch.cr4;

	vcpu->arch.cr4 = cr4;
	if (!npt_enabled) {
		cr4 |= X86_CR4_PAE;

		if (!is_paging(vcpu))
			cr4 &= ~(X86_CR4_SMEP | X86_CR4_SMAP | X86_CR4_PKE);
	}
	cr4 |= host_cr4_mce;
	to_svm(vcpu)->vmcb->save.cr4 = cr4;
	vmcb_mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR);

	if ((cr4 ^ old_cr4) & (X86_CR4_OSXSAVE | X86_CR4_PKE))
		vcpu->arch.cpuid_dynamic_bits_dirty = true;
}

static void svm_set_segment(struct kvm_vcpu *vcpu,
			    struct kvm_segment *var, int seg)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb_seg *s = svm_seg(vcpu, seg);

	s->base = var->base;
	s->limit = var->limit;
	s->selector = var->selector;
	s->attrib = (var->type & SVM_SELECTOR_TYPE_MASK);
	s->attrib |= (var->s & 1) << SVM_SELECTOR_S_SHIFT;
	s->attrib |= (var->dpl & 3) << SVM_SELECTOR_DPL_SHIFT;
	s->attrib |= ((var->present & 1) && !var->unusable) << SVM_SELECTOR_P_SHIFT;
	s->attrib |= (var->avl & 1) << SVM_SELECTOR_AVL_SHIFT;
	s->attrib |= (var->l & 1) << SVM_SELECTOR_L_SHIFT;
	s->attrib |= (var->db & 1) << SVM_SELECTOR_DB_SHIFT;
	s->attrib |= (var->g & 1) << SVM_SELECTOR_G_SHIFT;

	/*
	 * This is always accurate, except if SYSRET returned to a segment
	 * with SS.DPL != 3.  Intel does not have this quirk, and always
	 * forces SS.DPL to 3 on sysret, so we ignore that case; fixing it
	 * would entail passing the CPL to userspace and back.
	 */
	if (seg == VCPU_SREG_SS)
		/* This is symmetric with svm_get_segment() */
		svm->vmcb->save.cpl = (var->dpl & 3);

	vmcb_mark_dirty(svm->vmcb, VMCB_SEG);
}

static void svm_update_exception_bitmap(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	clr_exception_intercept(svm, BP_VECTOR);

	if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
		if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
			set_exception_intercept(svm, BP_VECTOR);
	}
}

static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *sd)
{
	if (sd->next_asid > sd->max_asid) {
		++sd->asid_generation;
		sd->next_asid = sd->min_asid;
		sd->flush_all_asids = true;
	}

	svm->current_vmcb->asid_generation = sd->asid_generation;
	svm->asid = sd->next_asid++;
}

static void svm_set_dr6(struct kvm_vcpu *vcpu, unsigned long value)
{
	struct vmcb *vmcb = to_svm(vcpu)->vmcb;

	if (vcpu->arch.guest_state_protected)
		return;

	if (unlikely(value != vmcb->save.dr6)) {
		vmcb->save.dr6 = value;
		vmcb_mark_dirty(vmcb, VMCB_DR);
	}
}

static void svm_sync_dirty_debug_regs(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	if (WARN_ON_ONCE(is_sev_es_guest(vcpu)))
		return;

	get_debugreg(vcpu->arch.db[0], 0);
	get_debugreg(vcpu->arch.db[1], 1);
	get_debugreg(vcpu->arch.db[2], 2);
	get_debugreg(vcpu->arch.db[3], 3);
	/*
	 * We cannot reset svm->vmcb->save.dr6 to DR6_ACTIVE_LOW here,
	 * because db_interception might need it.  We can do it before vmentry.
	 */
	vcpu->arch.dr6 = svm->vmcb->save.dr6;
	vcpu->arch.dr7 = svm->vmcb->save.dr7;
	vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_WONT_EXIT;
	set_dr_intercepts(svm);
}

static void svm_set_dr7(struct kvm_vcpu *vcpu, unsigned long value)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	if (vcpu->arch.guest_state_protected)
		return;

	svm->vmcb->save.dr7 = value;
	vmcb_mark_dirty(svm->vmcb, VMCB_DR);
}

static int pf_interception(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	u64 fault_address = svm->vmcb->control.exit_info_2;
	u64 error_code = svm->vmcb->control.exit_info_1;

	return kvm_handle_page_fault(vcpu, error_code, fault_address,
			cpu_feature_enabled(X86_FEATURE_DECODEASSISTS) ?
			svm->vmcb->control.insn_bytes : NULL,
			svm->vmcb->control.insn_len);
}

static int svm_check_emulate_instruction(struct kvm_vcpu *vcpu, int emul_type,
					 void *insn, int insn_len);

static int npf_interception(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	int rc;

	u64 error_code = svm->vmcb->control.exit_info_1;
	gpa_t gpa = svm->vmcb->control.exit_info_2;

	/*
	 * WARN if hardware generates a fault with an error code that collides
	 * with KVM-defined sythentic flags.  Clear the flags and continue on,
	 * i.e. don't terminate the VM, as KVM can't possibly be relying on a
	 * flag that KVM doesn't know about.
	 */
	if (WARN_ON_ONCE(error_code & PFERR_SYNTHETIC_MASK))
		error_code &= ~PFERR_SYNTHETIC_MASK;

	/*
	 * Expedite fast MMIO kicks if the next RIP is known and KVM is allowed
	 * emulate a page fault, e.g. skipping the current instruction is wrong
	 * if the #NPF occurred while vectoring an event.
	 */
	if ((error_code & PFERR_RSVD_MASK) && !is_guest_mode(vcpu)) {
		const int emul_type = EMULTYPE_PF | EMULTYPE_NO_DECODE;

		if (svm_check_emulate_instruction(vcpu, emul_type, NULL, 0))
			return 1;

		if (nrips && svm->vmcb->control.next_rip &&
		    !kvm_io_bus_write(vcpu, KVM_FAST_MMIO_BUS, gpa, 0, NULL)) {
			trace_kvm_fast_mmio(gpa);
			return kvm_skip_emulated_instruction(vcpu);
		}
	}

	if (!is_sev_es_guest(vcpu) &&
	    (svm->vmcb->control.misc_ctl & SVM_MISC_ENABLE_GMET) &&
	    (error_code & PFERR_FETCH_MASK)) {
		/*
		 * Work around errata 1218: EXITINFO1[2] May Be Incorrectly Set
		 * When GMET (Guest Mode Execute Trap extension) is Enabled
		 */
		error_code |= PFERR_USER_MASK;
		if (svm_get_cpl(vcpu) != 3)
			error_code &= ~PFERR_USER_MASK;
	}

	if (is_sev_snp_guest(vcpu) && (error_code & PFERR_GUEST_ENC_MASK))
		error_code |= PFERR_PRIVATE_ACCESS;

	trace_kvm_page_fault(vcpu, gpa, error_code);
	rc = kvm_mmu_page_fault(vcpu, gpa, error_code,
				cpu_feature_enabled(X86_FEATURE_DECODEASSISTS) ?
				svm->vmcb->control.insn_bytes : NULL,
				svm->vmcb->control.insn_len);

	if (rc > 0 && error_code & PFERR_GUEST_RMP_MASK)
		sev_handle_rmp_fault(vcpu, gpa, error_code);

	return rc;
}

static int db_interception(struct kvm_vcpu *vcpu)
{
	struct kvm_run *kvm_run = vcpu->run;
	struct vcpu_svm *svm = to_svm(vcpu);

	if (!(vcpu->guest_debug &
	      (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) &&
		!svm->nmi_singlestep) {
		u32 payload = svm->vmcb->save.dr6 ^ DR6_ACTIVE_LOW;
		kvm_queue_exception_p(vcpu, DB_VECTOR, payload);
		return 1;
	}

	if (svm->nmi_singlestep) {
		disable_nmi_singlestep(svm);
		/* Make sure we check for pending NMIs upon entry */
		kvm_make_request(KVM_REQ_EVENT, vcpu);
	}

	if (vcpu->guest_debug &
	    (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) {
		kvm_run->exit_reason = KVM_EXIT_DEBUG;
		kvm_run->debug.arch.dr6 = svm->vmcb->save.dr6;
		kvm_run->debug.arch.dr7 = svm->vmcb->save.dr7;
		kvm_run->debug.arch.pc =
			svm->vmcb->save.cs.base + svm->vmcb->save.rip;
		kvm_run->debug.arch.exception = DB_VECTOR;
		return 0;
	}

	return 1;
}

static int bp_interception(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct kvm_run *kvm_run = vcpu->run;

	kvm_run->exit_reason = KVM_EXIT_DEBUG;
	kvm_run->debug.arch.pc = svm->vmcb->save.cs.base + svm->vmcb->save.rip;
	kvm_run->debug.arch.exception = BP_VECTOR;
	return 0;
}

static int icebp_interception(struct kvm_vcpu *vcpu)
{
	/*
	 * Intercept and emulate ICEBP (INT1, opcode 0xF1) instead of allowing
	 * the guest to natively take the #DB trap, so that RIP is advanced
	 * past the instruction *before* #DB is injected.  This is necessary
	 * because SVM reports the wrong RIP for ICEBP-induced #DB when #DBs
	 * are delivered via a task gate: RIP points at the ICEBP instruction
	 * instead of after it (and SVM doesn't provide enough information for
	 * KVM to detect and manually advance the pre-#DB RIP).
	 */
	svm_skip_emulated_instruction(vcpu);
	kvm_queue_exception(vcpu, DB_VECTOR);
	return 1;
}

static int ud_interception(struct kvm_vcpu *vcpu)
{
	return handle_ud(vcpu);
}

static int ac_interception(struct kvm_vcpu *vcpu)
{
	kvm_queue_exception_e(vcpu, AC_VECTOR, 0);
	return 1;
}

static bool is_erratum_383(void)
{
	int i;
	u64 value;

	if (!erratum_383_found)
		return false;

	if (native_read_msr_safe(MSR_IA32_MC0_STATUS, &value))
		return false;

	/* Bit 62 may or may not be set for this mce */
	value &= ~(1ULL << 62);

	if (value != 0xb600000000010015ULL)
		return false;

	/* Clear MCi_STATUS registers */
	for (i = 0; i < 6; ++i)
		native_write_msr_safe(MSR_IA32_MCx_STATUS(i), 0);

	if (!native_read_msr_safe(MSR_IA32_MCG_STATUS, &value)) {
		value &= ~(1ULL << 2);
		native_write_msr_safe(MSR_IA32_MCG_STATUS, value);
	}

	/* Flush tlb to evict multi-match entries */
	__flush_tlb_all();

	return true;
}

static void svm_handle_mce(struct kvm_vcpu *vcpu)
{
	if (is_erratum_383()) {
		/*
		 * Erratum 383 triggered. Guest state is corrupt so kill the
		 * guest.
		 */
		pr_err("Guest triggered AMD Erratum 383\n");

		kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);

		return;
	}

	/*
	 * On an #MC intercept the MCE handler is not called automatically in
	 * the host. So do it by hand here.
	 */
	kvm_machine_check();
}

static int mc_interception(struct kvm_vcpu *vcpu)
{
	return 1;
}

static int shutdown_interception(struct kvm_vcpu *vcpu)
{
	struct kvm_run *kvm_run = vcpu->run;
	struct vcpu_svm *svm = to_svm(vcpu);


	/*
	 * VMCB is undefined after a SHUTDOWN intercept.  INIT the vCPU to put
	 * the VMCB in a known good state.  Unfortuately, KVM doesn't have
	 * KVM_MP_STATE_SHUTDOWN and can't add it without potentially breaking
	 * userspace.  At a platform view, INIT is acceptable behavior as
	 * there exist bare metal platforms that automatically INIT the CPU
	 * in response to shutdown.
	 *
	 * The VM save area for SEV-ES guests has already been encrypted so it
	 * cannot be reinitialized, i.e. synthesizing INIT is futile.
	 */
	if (!is_sev_es_guest(vcpu)) {
		clear_page(svm->vmcb);
#ifdef CONFIG_KVM_SMM
		if (is_smm(vcpu))
			kvm_smm_changed(vcpu, false);
#endif
		kvm_vcpu_reset(vcpu, true);
	}

	kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
	return 0;
}

static int io_interception(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	u32 io_info = svm->vmcb->control.exit_info_1; /* address size bug? */
	int size, in, string;
	unsigned port;

	++vcpu->stat.io_exits;
	string = (io_info & SVM_IOIO_STR_MASK) != 0;
	in = (io_info & SVM_IOIO_TYPE_MASK) != 0;
	port = io_info >> 16;
	size = (io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT;

	if (string) {
		if (is_sev_es_guest(vcpu))
			return sev_es_string_io(svm, size, port, in);
		else
			return kvm_emulate_instruction(vcpu, 0);
	}

	svm->next_rip = svm->vmcb->control.exit_info_2;

	return kvm_fast_pio(vcpu, size, port, in);
}

static int nmi_interception(struct kvm_vcpu *vcpu)
{
	return 1;
}

static int smi_interception(struct kvm_vcpu *vcpu)
{
	return 1;
}

static int intr_interception(struct kvm_vcpu *vcpu)
{
	++vcpu->stat.irq_exits;
	return 1;
}

static int vmload_vmsave_interception(struct kvm_vcpu *vcpu, bool vmload)
{
	u64 vmcb12_gpa = kvm_rax_read(vcpu);
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb *vmcb12;
	int ret;

	if (nested_svm_check_permissions(vcpu))
		return 1;

	if (!page_address_valid(vcpu, vmcb12_gpa)) {
		kvm_inject_gp(vcpu, 0);
		return 1;
	}

	CLASS(kvm_vcpu_map_local, m)(vcpu, gpa_to_gfn(vmcb12_gpa));
	if (m.ret)
		return kvm_handle_memory_failure(vcpu, X86EMUL_IO_NEEDED, NULL);

	vmcb12 = m.map.hva;

	ret = kvm_skip_emulated_instruction(vcpu);

	/* KVM always performs VMLOAD/VMSAVE on VMCB01 (see __svm_vcpu_run()) */
	if (vmload) {
		svm_copy_vmloadsave_state(svm->vmcb01.ptr, vmcb12);
		svm->sysenter_eip_hi = 0;
		svm->sysenter_esp_hi = 0;
	} else {
		svm_copy_vmloadsave_state(vmcb12, svm->vmcb01.ptr);
	}

	return ret;
}

static int vmload_interception(struct kvm_vcpu *vcpu)
{
	return vmload_vmsave_interception(vcpu, true);
}

static int vmsave_interception(struct kvm_vcpu *vcpu)
{
	return vmload_vmsave_interception(vcpu, false);
}

static int vmrun_interception(struct kvm_vcpu *vcpu)
{
	if (nested_svm_check_permissions(vcpu))
		return 1;

	return nested_svm_vmrun(vcpu);
}

/* Return 0 if not SVM instr, otherwise return associated exit_code */
static u64 svm_get_decoded_instr_exit_code(struct kvm_vcpu *vcpu)
{
	struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;

	if (ctxt->b != 0x1 || ctxt->opcode_len != 2)
		return 0;

	BUILD_BUG_ON(!SVM_EXIT_VMRUN || !SVM_EXIT_VMLOAD || !SVM_EXIT_VMSAVE);

	switch (ctxt->modrm) {
	case 0xd8: /* VMRUN */
		return SVM_EXIT_VMRUN;
	case 0xda: /* VMLOAD */
		return SVM_EXIT_VMLOAD;
	case 0xdb: /* VMSAVE */
		return SVM_EXIT_VMSAVE;
	default:
		break;
	}

	return 0;
}

/*
 * #GP handling code. Note that #GP can be triggered under the following two
 * cases:
 *   1) SVM VM-related instructions (VMRUN/VMSAVE/VMLOAD) that trigger #GP on
 *      some AMD CPUs when EAX of these instructions are in the reserved memory
 *      regions (e.g. SMM memory on host).
 *   2) VMware backdoor
 */
static int gp_interception(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	u32 error_code = svm->vmcb->control.exit_info_1;
	u64 svm_exit_code;

	/* Both #GP cases have zero error_code */
	if (error_code)
		goto reinject;

	/* Decode the instruction for usage later */
	if (x86_decode_emulated_instruction(vcpu, 0, NULL, 0) != EMULATION_OK)
		goto reinject;

	/* FIXME: Handle SVM instructions through the emulator */
	svm_exit_code = svm_get_decoded_instr_exit_code(vcpu);
	if (svm_exit_code) {
		if (!is_guest_mode(vcpu))
			return svm_invoke_exit_handler(vcpu, svm_exit_code);

		if (nested_svm_check_permissions(vcpu))
			return 1;

		if (!page_address_valid(vcpu, kvm_rax_read(vcpu)))
			goto reinject;

		/*
		 * FIXME: Only synthesize a #VMEXIT if L1 sets the intercept,
		 * but only after the VMLOAD/VMSAVE exit handlers can properly
		 * handle VMLOAD/VMSAVE from L2 with VLS enabled in L1 (i.e.
		 * RAX is an L2 GPA that needs translation through L1's NPT).
		 */
		nested_svm_simple_vmexit(svm, svm_exit_code);
		return 1;
	}

	/*
	 * VMware backdoor emulation on #GP interception only handles
	 * IN{S}, OUT{S}, and RDPMC, and only for L1.
	 */
	if (!enable_vmware_backdoor || is_guest_mode(vcpu))
		goto reinject;

	return kvm_emulate_instruction(vcpu, EMULTYPE_VMWARE_GP | EMULTYPE_NO_DECODE);

reinject:
	kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
	return 1;
}

void svm_set_gif(struct vcpu_svm *svm, bool value)
{
	if (value) {
		/*
		 * If VGIF is enabled, the STGI intercept is only added to
		 * detect the opening of the SMI/NMI window; remove it now.
		 * Likewise, clear the VINTR intercept, we will set it
		 * again while processing KVM_REQ_EVENT if needed.
		 */
		if (vgif)
			svm_clr_intercept(svm, INTERCEPT_STGI);
		if (svm_is_intercept(svm, INTERCEPT_VINTR))
			svm_clear_vintr(svm);

		enable_gif(svm);
		if (svm_has_pending_gif_event(svm))
			kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
	} else {
		disable_gif(svm);

		/*
		 * After a CLGI no interrupts should come.  But if vGIF is
		 * in use, we still rely on the VINTR intercept (rather than
		 * STGI) to detect an open interrupt window.
		*/
		if (!vgif)
			svm_clear_vintr(svm);
	}
}

static int stgi_interception(struct kvm_vcpu *vcpu)
{
	int ret;

	if (nested_svm_check_permissions(vcpu))
		return 1;

	ret = kvm_skip_emulated_instruction(vcpu);
	svm_set_gif(to_svm(vcpu), true);
	return ret;
}

static int clgi_interception(struct kvm_vcpu *vcpu)
{
	int ret;

	if (nested_svm_check_permissions(vcpu))
		return 1;

	ret = kvm_skip_emulated_instruction(vcpu);
	svm_set_gif(to_svm(vcpu), false);
	return ret;
}

static int invlpga_interception(struct kvm_vcpu *vcpu)
{
	/* FIXME: Handle an address size prefix. */
	gva_t gva = kvm_rax_read(vcpu);
	u32 asid = kvm_ecx_read(vcpu);

	if (nested_svm_check_permissions(vcpu))
		return 1;

	trace_kvm_invlpga(to_svm(vcpu)->vmcb->save.rip, asid, gva);

	/* Let's treat INVLPGA the same as INVLPG (can be optimized!) */
	kvm_mmu_invlpg(vcpu, gva);

	return kvm_skip_emulated_instruction(vcpu);
}

static int skinit_interception(struct kvm_vcpu *vcpu)
{
	trace_kvm_skinit(to_svm(vcpu)->vmcb->save.rip, kvm_rax_read(vcpu));

	kvm_queue_exception(vcpu, UD_VECTOR);
	return 1;
}

static int task_switch_interception(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	u16 tss_selector;
	int reason;
	int int_type = svm->vmcb->control.exit_int_info &
		SVM_EXITINTINFO_TYPE_MASK;
	int int_vec = svm->vmcb->control.exit_int_info & SVM_EVTINJ_VEC_MASK;
	uint32_t type =
		svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_TYPE_MASK;
	uint32_t idt_v =
		svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_VALID;
	bool has_error_code = false;
	u32 error_code = 0;

	tss_selector = (u16)svm->vmcb->control.exit_info_1;

	if (svm->vmcb->control.exit_info_2 &
	    (1ULL << SVM_EXITINFOSHIFT_TS_REASON_IRET))
		reason = TASK_SWITCH_IRET;
	else if (svm->vmcb->control.exit_info_2 &
		 (1ULL << SVM_EXITINFOSHIFT_TS_REASON_JMP))
		reason = TASK_SWITCH_JMP;
	else if (idt_v)
		reason = TASK_SWITCH_GATE;
	else
		reason = TASK_SWITCH_CALL;

	if (reason == TASK_SWITCH_GATE) {
		switch (type) {
		case SVM_EXITINTINFO_TYPE_NMI:
			vcpu->arch.nmi_injected = false;
			break;
		case SVM_EXITINTINFO_TYPE_EXEPT:
			if (svm->vmcb->control.exit_info_2 &
			    (1ULL << SVM_EXITINFOSHIFT_TS_HAS_ERROR_CODE)) {
				has_error_code = true;
				error_code =
					(u32)svm->vmcb->control.exit_info_2;
			}
			kvm_clear_exception_queue(vcpu);
			break;
		case SVM_EXITINTINFO_TYPE_INTR:
		case SVM_EXITINTINFO_TYPE_SOFT:
			kvm_clear_interrupt_queue(vcpu);
			break;
		default:
			break;
		}
	}

	if (reason != TASK_SWITCH_GATE ||
	    int_type == SVM_EXITINTINFO_TYPE_SOFT ||
	    (int_type == SVM_EXITINTINFO_TYPE_EXEPT &&
	     (int_vec == OF_VECTOR || int_vec == BP_VECTOR))) {
		if (!svm_skip_emulated_instruction(vcpu))
			return 0;
	}

	if (int_type != SVM_EXITINTINFO_TYPE_SOFT)
		int_vec = -1;

	return kvm_task_switch(vcpu, tss_selector, int_vec, reason,
			       has_error_code, error_code);
}

static void svm_clr_iret_intercept(struct vcpu_svm *svm)
{
	if (!is_sev_es_guest(&svm->vcpu))
		svm_clr_intercept(svm, INTERCEPT_IRET);
}

static void svm_set_iret_intercept(struct vcpu_svm *svm)
{
	if (!is_sev_es_guest(&svm->vcpu))
		svm_set_intercept(svm, INTERCEPT_IRET);
}

static int iret_interception(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	WARN_ON_ONCE(is_sev_es_guest(vcpu));

	++vcpu->stat.nmi_window_exits;
	svm->awaiting_iret_completion = true;

	svm_clr_iret_intercept(svm);
	svm->nmi_iret_rip = kvm_rip_read(vcpu);

	kvm_make_request(KVM_REQ_EVENT, vcpu);
	return 1;
}

static int invlpg_interception(struct kvm_vcpu *vcpu)
{
	if (!cpu_feature_enabled(X86_FEATURE_DECODEASSISTS))
		return kvm_emulate_instruction(vcpu, 0);

	kvm_mmu_invlpg(vcpu, to_svm(vcpu)->vmcb->control.exit_info_1);
	return kvm_skip_emulated_instruction(vcpu);
}

static int emulate_on_interception(struct kvm_vcpu *vcpu)
{
	return kvm_emulate_instruction(vcpu, 0);
}

static int rsm_interception(struct kvm_vcpu *vcpu)
{
	return kvm_emulate_instruction_from_buffer(vcpu, rsm_ins_bytes, 2);
}

static bool check_selective_cr0_intercepted(struct kvm_vcpu *vcpu,
					    unsigned long val)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	unsigned long cr0 = vcpu->arch.cr0;
	bool ret = false;

	if (!is_guest_mode(vcpu) ||
	    (!(vmcb12_is_intercept(&svm->nested.ctl, INTERCEPT_SELECTIVE_CR0))))
		return false;

	cr0 &= ~SVM_CR0_SELECTIVE_MASK;
	val &= ~SVM_CR0_SELECTIVE_MASK;

	if (cr0 ^ val) {
		svm->vmcb->control.exit_code = SVM_EXIT_CR0_SEL_WRITE;
		ret = (nested_svm_exit_handled(svm) == NESTED_EXIT_DONE);
	}

	return ret;
}

#define CR_VALID (1ULL << 63)

static int cr_interception(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	int reg, cr;
	unsigned long val;
	int err;

	if (!cpu_feature_enabled(X86_FEATURE_DECODEASSISTS))
		return emulate_on_interception(vcpu);

	if (unlikely((svm->vmcb->control.exit_info_1 & CR_VALID) == 0))
		return emulate_on_interception(vcpu);

	reg = svm->vmcb->control.exit_info_1 & SVM_EXITINFO_REG_MASK;
	if (svm->vmcb->control.exit_code == SVM_EXIT_CR0_SEL_WRITE)
		cr = SVM_EXIT_WRITE_CR0 - SVM_EXIT_READ_CR0;
	else
		cr = svm->vmcb->control.exit_code - SVM_EXIT_READ_CR0;

	err = 0;
	if (cr >= 16) { /* mov to cr */
		cr -= 16;
		val = kvm_register_read(vcpu, reg);
		trace_kvm_cr_write(cr, val);
		switch (cr) {
		case 0:
			if (!check_selective_cr0_intercepted(vcpu, val))
				err = kvm_set_cr0(vcpu, val);
			else
				return 1;

			break;
		case 3:
			err = kvm_set_cr3(vcpu, val);
			break;
		case 4:
			err = kvm_set_cr4(vcpu, val);
			break;
		case 8:
			err = kvm_set_cr8(vcpu, val);
			break;
		default:
			WARN(1, "unhandled write to CR%d", cr);
			kvm_queue_exception(vcpu, UD_VECTOR);
			return 1;
		}
	} else { /* mov from cr */
		switch (cr) {
		case 0:
			val = kvm_read_cr0(vcpu);
			break;
		case 2:
			val = vcpu->arch.cr2;
			break;
		case 3:
			val = kvm_read_cr3(vcpu);
			break;
		case 4:
			val = kvm_read_cr4(vcpu);
			break;
		case 8:
			val = kvm_get_cr8(vcpu);
			break;
		default:
			WARN(1, "unhandled read from CR%d", cr);
			kvm_queue_exception(vcpu, UD_VECTOR);
			return 1;
		}
		kvm_register_write(vcpu, reg, val);
		trace_kvm_cr_read(cr, val);
	}
	return kvm_complete_insn_gp(vcpu, err);
}

static int cr_trap(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	unsigned long old_value, new_value;
	unsigned int cr;
	int ret = 0;

	new_value = (unsigned long)svm->vmcb->control.exit_info_1;

	cr = svm->vmcb->control.exit_code - SVM_EXIT_CR0_WRITE_TRAP;
	switch (cr) {
	case 0:
		old_value = kvm_read_cr0(vcpu);
		svm_set_cr0(vcpu, new_value);

		kvm_post_set_cr0(vcpu, old_value, new_value);
		break;
	case 4:
		old_value = kvm_read_cr4(vcpu);
		svm_set_cr4(vcpu, new_value);

		kvm_post_set_cr4(vcpu, old_value, new_value);
		break;
	case 8:
		ret = kvm_set_cr8(vcpu, new_value);
		break;
	default:
		WARN(1, "unhandled CR%d write trap", cr);
		kvm_queue_exception(vcpu, UD_VECTOR);
		return 1;
	}

	return kvm_complete_insn_gp(vcpu, ret);
}

static int dr_interception(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	int reg, dr;
	int err = 0;

	/*
	 * SEV-ES intercepts DR7 only to disable guest debugging and the guest issues a VMGEXIT
	 * for DR7 write only. KVM cannot change DR7 (always swapped as type 'A') so return early.
	 */
	if (is_sev_es_guest(vcpu))
		return 1;

	if (vcpu->guest_debug == 0) {
		/*
		 * No more DR vmexits; force a reload of the debug registers
		 * and reenter on this instruction.  The next vmexit will
		 * retrieve the full state of the debug registers.
		 */
		clr_dr_intercepts(svm);
		vcpu->arch.switch_db_regs |= KVM_DEBUGREG_WONT_EXIT;
		return 1;
	}

	if (!boot_cpu_has(X86_FEATURE_DECODEASSISTS))
		return emulate_on_interception(vcpu);

	reg = svm->vmcb->control.exit_info_1 & SVM_EXITINFO_REG_MASK;
	dr = svm->vmcb->control.exit_code - SVM_EXIT_READ_DR0;
	if (dr >= 16) { /* mov to DRn  */
		dr -= 16;
		err = kvm_set_dr(vcpu, dr, kvm_register_read(vcpu, reg));
	} else {
		kvm_register_write(vcpu, reg, kvm_get_dr(vcpu, dr));
	}

	return kvm_complete_insn_gp(vcpu, err);
}

static int cr8_write_interception(struct kvm_vcpu *vcpu)
{
	u8 cr8_prev = kvm_get_cr8(vcpu);
	int r;

	WARN_ON_ONCE(kvm_vcpu_apicv_active(vcpu));

	/* instruction emulation calls kvm_set_cr8() */
	r = cr_interception(vcpu);
	if (lapic_in_kernel(vcpu))
		return r;
	if (cr8_prev <= kvm_get_cr8(vcpu))
		return r;
	vcpu->run->exit_reason = KVM_EXIT_SET_TPR;
	return 0;
}

static int efer_trap(struct kvm_vcpu *vcpu)
{
	struct msr_data msr_info;
	int ret;

	/*
	 * Clear the EFER_SVME bit from EFER. The SVM code always sets this
	 * bit in svm_set_efer(), but __kvm_valid_efer() checks it against
	 * whether the guest has X86_FEATURE_SVM - this avoids a failure if
	 * the guest doesn't have X86_FEATURE_SVM.
	 */
	msr_info.host_initiated = false;
	msr_info.index = MSR_EFER;
	msr_info.data = to_svm(vcpu)->vmcb->control.exit_info_1 & ~EFER_SVME;
	ret = kvm_set_msr_common(vcpu, &msr_info);

	return kvm_complete_insn_gp(vcpu, ret);
}

static int svm_get_feature_msr(u32 msr, u64 *data)
{
	*data = 0;

	switch (msr) {
	case MSR_AMD64_DE_CFG:
		if (cpu_feature_enabled(X86_FEATURE_LFENCE_RDTSC))
			*data |= MSR_AMD64_DE_CFG_LFENCE_SERIALIZE;
		break;
	default:
		return KVM_MSR_RET_UNSUPPORTED;
	}

	return 0;
}

static u64 *svm_vmcb_lbr(struct vcpu_svm *svm, u32 msr)
{
	switch (msr) {
	case MSR_IA32_LASTBRANCHFROMIP:
		return &svm->vmcb->save.br_from;
	case MSR_IA32_LASTBRANCHTOIP:
		return &svm->vmcb->save.br_to;
	case MSR_IA32_LASTINTFROMIP:
		return &svm->vmcb->save.last_excp_from;
	case MSR_IA32_LASTINTTOIP:
		return &svm->vmcb->save.last_excp_to;
	default:
		break;
	}
	KVM_BUG_ON(1, svm->vcpu.kvm);
	return &svm->vmcb->save.br_from;
}

static bool sev_es_prevent_msr_access(struct kvm_vcpu *vcpu,
				      struct msr_data *msr_info)
{
	return is_sev_es_guest(vcpu) && vcpu->arch.guest_state_protected &&
	       msr_info->index != MSR_IA32_XSS &&
	       !msr_write_intercepted(to_svm(vcpu), msr_info->index);
}

static bool svm_pat_accesses_gpat(struct kvm_vcpu *vcpu, bool from_host)
{
	/*
	 * When KVM_X86_QUIRK_NESTED_SVM_SHARED_PAT is disabled and nested
	 * NPT is enabled, L2 has a separate PAT from L1.  Guest accesses
	 * to IA32_PAT while running L2 target L2's gPAT; host-initiated
	 * accesses always target L1's hPAT so that KVM_GET/SET_MSRS and
	 * KVM_GET/SET_NESTED_STATE are independent of each other and can
	 * be ordered arbitrarily during save and restore.
	 */
	WARN_ON_ONCE(from_host && vcpu->wants_to_run);
	return !from_host && is_guest_mode(vcpu) && l2_has_separate_pat(vcpu);
}

static int svm_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	if (sev_es_prevent_msr_access(vcpu, msr_info)) {
		msr_info->data = 0;
		return vcpu->kvm->arch.has_protected_state ? -EINVAL : 0;
	}

	switch (msr_info->index) {
	case MSR_AMD64_TSC_RATIO:
		if (!msr_info->host_initiated &&
		    !guest_cpu_cap_has(vcpu, X86_FEATURE_TSCRATEMSR))
			return 1;
		msr_info->data = svm->tsc_ratio_msr;
		break;
	case MSR_STAR:
		msr_info->data = svm->vmcb01.ptr->save.star;
		break;
#ifdef CONFIG_X86_64
	case MSR_LSTAR:
		msr_info->data = svm->vmcb01.ptr->save.lstar;
		break;
	case MSR_CSTAR:
		msr_info->data = svm->vmcb01.ptr->save.cstar;
		break;
	case MSR_GS_BASE:
		msr_info->data = svm->vmcb01.ptr->save.gs.base;
		break;
	case MSR_FS_BASE:
		msr_info->data = svm->vmcb01.ptr->save.fs.base;
		break;
	case MSR_KERNEL_GS_BASE:
		msr_info->data = svm->vmcb01.ptr->save.kernel_gs_base;
		break;
	case MSR_SYSCALL_MASK:
		msr_info->data = svm->vmcb01.ptr->save.sfmask;
		break;
#endif
	case MSR_IA32_SYSENTER_CS:
		msr_info->data = svm->vmcb01.ptr->save.sysenter_cs;
		break;
	case MSR_IA32_SYSENTER_EIP:
		msr_info->data = (u32)svm->vmcb01.ptr->save.sysenter_eip;
		if (guest_cpuid_is_intel_compatible(vcpu))
			msr_info->data |= (u64)svm->sysenter_eip_hi << 32;
		break;
	case MSR_IA32_SYSENTER_ESP:
		msr_info->data = svm->vmcb01.ptr->save.sysenter_esp;
		if (guest_cpuid_is_intel_compatible(vcpu))
			msr_info->data |= (u64)svm->sysenter_esp_hi << 32;
		break;
	case MSR_IA32_S_CET:
		msr_info->data = svm->vmcb->save.s_cet;
		break;
	case MSR_IA32_INT_SSP_TAB:
		msr_info->data = svm->vmcb->save.isst_addr;
		break;
	case MSR_KVM_INTERNAL_GUEST_SSP:
		msr_info->data = svm->vmcb->save.ssp;
		break;
	case MSR_TSC_AUX:
		msr_info->data = svm->tsc_aux;
		break;
	case MSR_IA32_DEBUGCTLMSR:
		msr_info->data = lbrv ? svm->vmcb->save.dbgctl : 0;
		break;
	case MSR_IA32_LASTBRANCHFROMIP:
	case MSR_IA32_LASTBRANCHTOIP:
	case MSR_IA32_LASTINTFROMIP:
	case MSR_IA32_LASTINTTOIP:
		msr_info->data = lbrv ? *svm_vmcb_lbr(svm, msr_info->index) : 0;
		break;
	case MSR_VM_HSAVE_PA:
		msr_info->data = svm->nested.hsave_msr;
		break;
	case MSR_VM_CR:
		msr_info->data = svm->nested.vm_cr_msr;
		break;
	case MSR_IA32_SPEC_CTRL:
		if (!msr_info->host_initiated &&
		    !guest_has_spec_ctrl_msr(vcpu))
			return 1;

		if (boot_cpu_has(X86_FEATURE_V_SPEC_CTRL))
			msr_info->data = svm->vmcb->save.spec_ctrl;
		else
			msr_info->data = svm->spec_ctrl;
		break;
	case MSR_AMD64_VIRT_SPEC_CTRL:
		if (!msr_info->host_initiated &&
		    !guest_cpu_cap_has(vcpu, X86_FEATURE_VIRT_SSBD))
			return 1;

		msr_info->data = svm->virt_spec_ctrl;
		break;
	case MSR_F15H_IC_CFG: {

		int family, model;

		family = guest_cpuid_family(vcpu);
		model  = guest_cpuid_model(vcpu);

		if (family < 0 || model < 0)
			return kvm_get_msr_common(vcpu, msr_info);

		msr_info->data = 0;

		if (family == 0x15 &&
		    (model >= 0x2 && model < 0x20))
			msr_info->data = 0x1E;
		}
		break;
	case MSR_AMD64_DE_CFG:
		msr_info->data = svm->msr_decfg;
		break;
	case MSR_IA32_CR_PAT:
		if (svm_pat_accesses_gpat(vcpu, msr_info->host_initiated)) {
			msr_info->data = svm->vmcb->save.g_pat;
			break;
		}
		return kvm_get_msr_common(vcpu, msr_info);
	default:
		return kvm_get_msr_common(vcpu, msr_info);
	}
	return 0;
}

static int svm_complete_emulated_msr(struct kvm_vcpu *vcpu, int err)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	if (!err || !is_sev_es_guest(vcpu) || WARN_ON_ONCE(!svm->sev_es.ghcb))
		return kvm_complete_insn_gp(vcpu, err);

	svm_vmgexit_inject_exception(svm, X86_TRAP_GP);
	return 1;
}

static int svm_set_vm_cr(struct kvm_vcpu *vcpu, u64 data)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	int svm_dis, chg_mask;

	if (data & ~SVM_VM_CR_VALID_MASK)
		return 1;

	chg_mask = SVM_VM_CR_VALID_MASK;

	if (svm->nested.vm_cr_msr & SVM_VM_CR_SVM_DIS_MASK)
		chg_mask &= ~(SVM_VM_CR_SVM_LOCK_MASK | SVM_VM_CR_SVM_DIS_MASK);

	svm->nested.vm_cr_msr &= ~chg_mask;
	svm->nested.vm_cr_msr |= (data & chg_mask);

	svm_dis = svm->nested.vm_cr_msr & SVM_VM_CR_SVM_DIS_MASK;

	/* check for svm_disable while efer.svme is set */
	if (svm_dis && (vcpu->arch.efer & EFER_SVME))
		return 1;

	return 0;
}

static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	int ret = 0;

	u32 ecx = msr->index;
	u64 data = msr->data;

	if (sev_es_prevent_msr_access(vcpu, msr))
		return vcpu->kvm->arch.has_protected_state ? -EINVAL : 0;

	switch (ecx) {
	case MSR_AMD64_TSC_RATIO:

		if (!guest_cpu_cap_has(vcpu, X86_FEATURE_TSCRATEMSR)) {

			if (!msr->host_initiated)
				return 1;
			/*
			 * In case TSC scaling is not enabled, always
			 * leave this MSR at the default value.
			 *
			 * Due to bug in qemu 6.2.0, it would try to set
			 * this msr to 0 if tsc scaling is not enabled.
			 * Ignore this value as well.
			 */
			if (data != 0 && data != svm->tsc_ratio_msr)
				return 1;
			break;
		}

		if (data & SVM_TSC_RATIO_RSVD)
			return 1;

		svm->tsc_ratio_msr = data;

		if (guest_cpu_cap_has(vcpu, X86_FEATURE_TSCRATEMSR) &&
		    is_guest_mode(vcpu))
			nested_svm_update_tsc_ratio_msr(vcpu);

		break;
	case MSR_IA32_CR_PAT:
		if (svm_pat_accesses_gpat(vcpu, msr->host_initiated)) {
			if (!kvm_pat_valid(data))
				return 1;

			vmcb_set_gpat(svm->vmcb, data);
			break;
		}

		ret = kvm_set_msr_common(vcpu, msr);
		if (ret)
			break;

		if (npt_enabled) {
			vmcb_set_gpat(svm->vmcb01.ptr, data);
			if (is_guest_mode(vcpu) && !l2_has_separate_pat(vcpu))
				vmcb_set_gpat(svm->vmcb, data);
		}
		break;
	case MSR_IA32_SPEC_CTRL:
		if (!msr->host_initiated &&
		    !guest_has_spec_ctrl_msr(vcpu))
			return 1;

		if (kvm_spec_ctrl_test_value(data))
			return 1;

		if (boot_cpu_has(X86_FEATURE_V_SPEC_CTRL))
			svm->vmcb->save.spec_ctrl = data;
		else
			svm->spec_ctrl = data;
		if (!data)
			break;

		/*
		 * For non-nested:
		 * When it's written (to non-zero) for the first time, pass
		 * it through.
		 *
		 * For nested:
		 * The handling of the MSR bitmap for L2 guests is done in
		 * nested_svm_merge_msrpm().
		 * We update the L1 MSR bit as well since it will end up
		 * touching the MSR anyway now.
		 */
		svm_disable_intercept_for_msr(vcpu, MSR_IA32_SPEC_CTRL, MSR_TYPE_RW);
		break;
	case MSR_AMD64_VIRT_SPEC_CTRL:
		if (!msr->host_initiated &&
		    !guest_cpu_cap_has(vcpu, X86_FEATURE_VIRT_SSBD))
			return 1;

		if (data & ~SPEC_CTRL_SSBD)
			return 1;

		svm->virt_spec_ctrl = data;
		break;
	case MSR_STAR:
		svm->vmcb01.ptr->save.star = data;
		break;
#ifdef CONFIG_X86_64
	case MSR_LSTAR:
		svm->vmcb01.ptr->save.lstar = data;
		break;
	case MSR_CSTAR:
		svm->vmcb01.ptr->save.cstar = data;
		break;
	case MSR_GS_BASE:
		svm->vmcb01.ptr->save.gs.base = data;
		break;
	case MSR_FS_BASE:
		svm->vmcb01.ptr->save.fs.base = data;
		break;
	case MSR_KERNEL_GS_BASE:
		svm->vmcb01.ptr->save.kernel_gs_base = data;
		break;
	case MSR_SYSCALL_MASK:
		svm->vmcb01.ptr->save.sfmask = data;
		break;
#endif
	case MSR_IA32_SYSENTER_CS:
		svm->vmcb01.ptr->save.sysenter_cs = data;
		break;
	case MSR_IA32_SYSENTER_EIP:
		svm->vmcb01.ptr->save.sysenter_eip = (u32)data;
		/*
		 * We only intercept the MSR_IA32_SYSENTER_{EIP|ESP} msrs
		 * when we spoof an Intel vendor ID (for cross vendor migration).
		 * In this case we use this intercept to track the high
		 * 32 bit part of these msrs to support Intel's
		 * implementation of SYSENTER/SYSEXIT.
		 */
		svm->sysenter_eip_hi = guest_cpuid_is_intel_compatible(vcpu) ? (data >> 32) : 0;
		break;
	case MSR_IA32_SYSENTER_ESP:
		svm->vmcb01.ptr->save.sysenter_esp = (u32)data;
		svm->sysenter_esp_hi = guest_cpuid_is_intel_compatible(vcpu) ? (data >> 32) : 0;
		break;
	case MSR_IA32_S_CET:
		svm->vmcb->save.s_cet = data;
		vmcb_mark_dirty(svm->vmcb01.ptr, VMCB_CET);
		break;
	case MSR_IA32_INT_SSP_TAB:
		svm->vmcb->save.isst_addr = data;
		vmcb_mark_dirty(svm->vmcb01.ptr, VMCB_CET);
		break;
	case MSR_KVM_INTERNAL_GUEST_SSP:
		svm->vmcb->save.ssp = data;
		vmcb_mark_dirty(svm->vmcb01.ptr, VMCB_CET);
		break;
	case MSR_TSC_AUX:
		/*
		 * TSC_AUX is always virtualized for SEV-ES guests when the
		 * feature is available. The user return MSR support is not
		 * required in this case because TSC_AUX is restored on #VMEXIT
		 * from the host save area.
		 */
		if (boot_cpu_has(X86_FEATURE_V_TSC_AUX) && is_sev_es_guest(vcpu))
			break;

		/*
		 * TSC_AUX is usually changed only during boot and never read
		 * directly.  Intercept TSC_AUX and switch it via user return.
		 */
		preempt_disable();
		ret = kvm_set_user_return_msr(tsc_aux_uret_slot, data, -1ull);
		preempt_enable();
		if (ret)
			break;

		svm->tsc_aux = data;
		break;
	case MSR_IA32_DEBUGCTLMSR:
		if (!lbrv) {
			kvm_pr_unimpl_wrmsr(vcpu, ecx, data);
			break;
		}

		/*
		 * Suppress BTF as KVM doesn't virtualize BTF, but there's no
		 * way to communicate lack of support to the guest.
		 */
		if (data & DEBUGCTLMSR_BTF) {
			kvm_pr_unimpl_wrmsr(vcpu, MSR_IA32_DEBUGCTLMSR, data);
			data &= ~DEBUGCTLMSR_BTF;
		}

		if (data & DEBUGCTL_RESERVED_BITS)
			return 1;

		if (svm->vmcb->save.dbgctl == data)
			break;

		svm->vmcb->save.dbgctl = data;
		vmcb_mark_dirty(svm->vmcb, VMCB_LBR);
		svm_update_lbrv(vcpu);
		break;
	case MSR_IA32_LASTBRANCHFROMIP:
	case MSR_IA32_LASTBRANCHTOIP:
	case MSR_IA32_LASTINTFROMIP:
	case MSR_IA32_LASTINTTOIP:
		if (!lbrv)
			return KVM_MSR_RET_UNSUPPORTED;
		if (!msr->host_initiated)
			return 1;
		*svm_vmcb_lbr(svm, ecx) = data;
		vmcb_mark_dirty(svm->vmcb, VMCB_LBR);
		break;
	case MSR_VM_HSAVE_PA:
		/*
		 * Old kernels did not validate the value written to
		 * MSR_VM_HSAVE_PA.  Allow KVM_SET_MSR to set an invalid
		 * value to allow live migrating buggy or malicious guests
		 * originating from those kernels.
		 */
		if (!msr->host_initiated && !page_address_valid(vcpu, data))
			return 1;

		svm->nested.hsave_msr = data & PAGE_MASK;
		break;
	case MSR_VM_CR:
		return svm_set_vm_cr(vcpu, data);
	case MSR_VM_IGNNE:
		kvm_pr_unimpl_wrmsr(vcpu, ecx, data);
		break;
	case MSR_AMD64_DE_CFG: {
		u64 supported_de_cfg;

		if (svm_get_feature_msr(ecx, &supported_de_cfg))
			return 1;

		if (data & ~supported_de_cfg)
			return 1;

		svm->msr_decfg = data;
		break;
	}
	default:
		return kvm_set_msr_common(vcpu, msr);
	}
	return ret;
}

static int msr_interception(struct kvm_vcpu *vcpu)
{
	if (to_svm(vcpu)->vmcb->control.exit_info_1)
		return kvm_emulate_wrmsr(vcpu);
	else
		return kvm_emulate_rdmsr(vcpu);
}

static int interrupt_window_interception(struct kvm_vcpu *vcpu)
{
	kvm_make_request(KVM_REQ_EVENT, vcpu);
	svm_clear_vintr(to_svm(vcpu));

	++vcpu->stat.irq_window_exits;
	return 1;
}

static int pause_interception(struct kvm_vcpu *vcpu)
{
	bool in_kernel;
	/*
	 * CPL is not made available for an SEV-ES guest, therefore
	 * vcpu->arch.preempted_in_kernel can never be true.  Just
	 * set in_kernel to false as well.
	 */
	in_kernel = !is_sev_es_guest(vcpu) && svm_get_cpl(vcpu) == 0;

	grow_ple_window(vcpu);

	kvm_vcpu_on_spin(vcpu, in_kernel);
	return kvm_skip_emulated_instruction(vcpu);
}

static int invpcid_interception(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	unsigned long type;
	gva_t gva;

	if (!guest_cpu_cap_has(vcpu, X86_FEATURE_INVPCID)) {
		kvm_queue_exception(vcpu, UD_VECTOR);
		return 1;
	}

	/*
	 * For an INVPCID intercept:
	 * EXITINFO1 provides the linear address of the memory operand.
	 * EXITINFO2 provides the contents of the register operand.
	 */
	type = svm->vmcb->control.exit_info_2;
	gva = svm->vmcb->control.exit_info_1;

	/*
	 * FIXME: Perform segment checks for 32-bit mode, and inject #SS if the
	 *        stack segment is used.  The intercept takes priority over all
	 *        #GP checks except CPL>0, but somehow still generates a linear
	 *        address?  The APM is sorely lacking.
	 */
	if (is_noncanonical_address(gva, vcpu, 0)) {
		kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
		return 1;
	}

	return kvm_handle_invpcid(vcpu, type, gva);
}

static inline int complete_userspace_buslock(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	/*
	 * If userspace has NOT changed RIP, then KVM's ABI is to let the guest
	 * execute the bus-locking instruction.  Set the bus lock counter to '1'
	 * to effectively step past the bus lock.
	 */
	if (kvm_is_linear_rip(vcpu, vcpu->arch.cui_linear_rip))
		svm->vmcb->control.bus_lock_counter = 1;

	return 1;
}

static int bus_lock_exit(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	vcpu->run->exit_reason = KVM_EXIT_X86_BUS_LOCK;
	vcpu->run->flags |= KVM_RUN_X86_BUS_LOCK;

	vcpu->arch.cui_linear_rip = kvm_get_linear_rip(vcpu);
	vcpu->arch.complete_userspace_io = complete_userspace_buslock;

	if (is_guest_mode(vcpu))
		svm->nested.last_bus_lock_rip = vcpu->arch.cui_linear_rip;

	return 0;
}

static int vmmcall_interception(struct kvm_vcpu *vcpu)
{
	/*
	 * Inject a #UD if L2 is active and the VMMCALL isn't a Hyper-V TLB
	 * hypercall, as VMMCALL #UDs if it's not intercepted, and this path is
	 * reachable if and only if L1 doesn't want to intercept VMMCALL or has
	 * enabled L0 (KVM) handling of Hyper-V L2 TLB flush hypercalls.
	 */
	if (is_guest_mode(vcpu) && !nested_svm_is_l2_tlb_flush_hcall(vcpu)) {
		kvm_queue_exception(vcpu, UD_VECTOR);
		return 1;
	}

	return kvm_emulate_hypercall(vcpu);
}

static int (*const svm_exit_handlers[])(struct kvm_vcpu *vcpu) = {
	[SVM_EXIT_READ_CR0]			= cr_interception,
	[SVM_EXIT_READ_CR3]			= cr_interception,
	[SVM_EXIT_READ_CR4]			= cr_interception,
	[SVM_EXIT_READ_CR8]			= cr_interception,
	[SVM_EXIT_CR0_SEL_WRITE]		= cr_interception,
	[SVM_EXIT_WRITE_CR0]			= cr_interception,
	[SVM_EXIT_WRITE_CR3]			= cr_interception,
	[SVM_EXIT_WRITE_CR4]			= cr_interception,
	[SVM_EXIT_WRITE_CR8]			= cr8_write_interception,
	[SVM_EXIT_READ_DR0]			= dr_interception,
	[SVM_EXIT_READ_DR1]			= dr_interception,
	[SVM_EXIT_READ_DR2]			= dr_interception,
	[SVM_EXIT_READ_DR3]			= dr_interception,
	[SVM_EXIT_READ_DR4]			= dr_interception,
	[SVM_EXIT_READ_DR5]			= dr_interception,
	[SVM_EXIT_READ_DR6]			= dr_interception,
	[SVM_EXIT_READ_DR7]			= dr_interception,
	[SVM_EXIT_WRITE_DR0]			= dr_interception,
	[SVM_EXIT_WRITE_DR1]			= dr_interception,
	[SVM_EXIT_WRITE_DR2]			= dr_interception,
	[SVM_EXIT_WRITE_DR3]			= dr_interception,
	[SVM_EXIT_WRITE_DR4]			= dr_interception,
	[SVM_EXIT_WRITE_DR5]			= dr_interception,
	[SVM_EXIT_WRITE_DR6]			= dr_interception,
	[SVM_EXIT_WRITE_DR7]			= dr_interception,
	[SVM_EXIT_EXCP_BASE + DB_VECTOR]	= db_interception,
	[SVM_EXIT_EXCP_BASE + BP_VECTOR]	= bp_interception,
	[SVM_EXIT_EXCP_BASE + UD_VECTOR]	= ud_interception,
	[SVM_EXIT_EXCP_BASE + PF_VECTOR]	= pf_interception,
	[SVM_EXIT_EXCP_BASE + MC_VECTOR]	= mc_interception,
	[SVM_EXIT_EXCP_BASE + AC_VECTOR]	= ac_interception,
	[SVM_EXIT_EXCP_BASE + GP_VECTOR]	= gp_interception,
	[SVM_EXIT_INTR]				= intr_interception,
	[SVM_EXIT_NMI]				= nmi_interception,
	[SVM_EXIT_SMI]				= smi_interception,
	[SVM_EXIT_VINTR]			= interrupt_window_interception,
	[SVM_EXIT_RDPMC]			= kvm_emulate_rdpmc,
	[SVM_EXIT_CPUID]			= kvm_emulate_cpuid,
	[SVM_EXIT_IRET]                         = iret_interception,
	[SVM_EXIT_INVD]                         = kvm_emulate_invd,
	[SVM_EXIT_PAUSE]			= pause_interception,
	[SVM_EXIT_HLT]				= kvm_emulate_halt,
	[SVM_EXIT_INVLPG]			= invlpg_interception,
	[SVM_EXIT_INVLPGA]			= invlpga_interception,
	[SVM_EXIT_IOIO]				= io_interception,
	[SVM_EXIT_MSR]				= msr_interception,
	[SVM_EXIT_TASK_SWITCH]			= task_switch_interception,
	[SVM_EXIT_SHUTDOWN]			= shutdown_interception,
	[SVM_EXIT_VMRUN]			= vmrun_interception,
	[SVM_EXIT_VMMCALL]			= vmmcall_interception,
	[SVM_EXIT_VMLOAD]			= vmload_interception,
	[SVM_EXIT_VMSAVE]			= vmsave_interception,
	[SVM_EXIT_STGI]				= stgi_interception,
	[SVM_EXIT_CLGI]				= clgi_interception,
	[SVM_EXIT_SKINIT]			= skinit_interception,
	[SVM_EXIT_RDTSCP]			= kvm_handle_invalid_op,
	[SVM_EXIT_WBINVD]                       = kvm_emulate_wbinvd,
	[SVM_EXIT_MONITOR]			= kvm_emulate_monitor,
	[SVM_EXIT_MWAIT]			= kvm_emulate_mwait,
	[SVM_EXIT_XSETBV]			= kvm_emulate_xsetbv,
	[SVM_EXIT_ICEBP]			= icebp_interception,
	[SVM_EXIT_RDPRU]			= kvm_handle_invalid_op,
	[SVM_EXIT_EFER_WRITE_TRAP]		= efer_trap,
	[SVM_EXIT_CR0_WRITE_TRAP]		= cr_trap,
	[SVM_EXIT_CR4_WRITE_TRAP]		= cr_trap,
	[SVM_EXIT_CR8_WRITE_TRAP]		= cr_trap,
	[SVM_EXIT_INVPCID]                      = invpcid_interception,
	[SVM_EXIT_IDLE_HLT]			= kvm_emulate_halt,
	[SVM_EXIT_NPF]				= npf_interception,
	[SVM_EXIT_BUS_LOCK]			= bus_lock_exit,
	[SVM_EXIT_RSM]                          = rsm_interception,
	[SVM_EXIT_AVIC_INCOMPLETE_IPI]		= avic_incomplete_ipi_interception,
	[SVM_EXIT_AVIC_UNACCELERATED_ACCESS]	= avic_unaccelerated_access_interception,
#ifdef CONFIG_KVM_AMD_SEV
	[SVM_EXIT_VMGEXIT]			= sev_handle_vmgexit,
#endif
};

static void dump_vmcb(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb_control_area *control = &svm->vmcb->control;
	struct vmcb_save_area *save = &svm->vmcb->save;
	struct vmcb_save_area *save01 = &svm->vmcb01.ptr->save;
	char *vm_type;

	if (!dump_invalid_vmcb) {
		pr_warn_ratelimited("set kvm_amd.dump_invalid_vmcb=1 to dump internal KVM state.\n");
		return;
	}

	guard(mutex)(&vmcb_dump_mutex);

	vm_type = is_sev_snp_guest(vcpu) ? "SEV-SNP" :
		  is_sev_es_guest(vcpu) ? "SEV-ES" :
		  is_sev_guest(vcpu) ? "SEV" : "SVM";

	pr_err("%s vCPU%u VMCB %p, last attempted VMRUN on CPU %d\n",
	       vm_type, vcpu->vcpu_id, svm->current_vmcb->ptr, vcpu->arch.last_vmentry_cpu);
	pr_err("VMCB Control Area:\n");
	pr_err("%-20s%04x\n", "cr_read:", control->intercepts[INTERCEPT_CR] & 0xffff);
	pr_err("%-20s%04x\n", "cr_write:", control->intercepts[INTERCEPT_CR] >> 16);
	pr_err("%-20s%04x\n", "dr_read:", control->intercepts[INTERCEPT_DR] & 0xffff);
	pr_err("%-20s%04x\n", "dr_write:", control->intercepts[INTERCEPT_DR] >> 16);
	pr_err("%-20s%08x\n", "exceptions:", control->intercepts[INTERCEPT_EXCEPTION]);
	pr_err("%-20s%08x %08x\n", "intercepts:",
              control->intercepts[INTERCEPT_WORD3],
	       control->intercepts[INTERCEPT_WORD4]);
	pr_err("%-20s%d\n", "pause filter count:", control->pause_filter_count);
	pr_err("%-20s%d\n", "pause filter threshold:",
	       control->pause_filter_thresh);
	pr_err("%-20s%016llx\n", "iopm_base_pa:", control->iopm_base_pa);
	pr_err("%-20s%016llx\n", "msrpm_base_pa:", control->msrpm_base_pa);
	pr_err("%-20s%016llx\n", "tsc_offset:", control->tsc_offset);
	pr_err("%-20s%d\n", "asid:", control->asid);
	pr_err("%-20s%d\n", "tlb_ctl:", control->tlb_ctl);
	pr_err("%-20s%d\n", "erap_ctl:", control->erap_ctl);
	pr_err("%-20s%08x\n", "int_ctl:", control->int_ctl);
	pr_err("%-20s%08x\n", "int_vector:", control->int_vector);
	pr_err("%-20s%08x\n", "int_state:", control->int_state);
	pr_err("%-20s%016llx\n", "exit_code:", control->exit_code);
	pr_err("%-20s%016llx\n", "exit_info1:", control->exit_info_1);
	pr_err("%-20s%016llx\n", "exit_info2:", control->exit_info_2);
	pr_err("%-20s%08x\n", "exit_int_info:", control->exit_int_info);
	pr_err("%-20s%08x\n", "exit_int_info_err:", control->exit_int_info_err);
	pr_err("%-20s%lld\n", "misc_ctl:", control->misc_ctl);
	pr_err("%-20s%016llx\n", "nested_cr3:", control->nested_cr3);
	pr_err("%-20s%016llx\n", "avic_vapic_bar:", control->avic_vapic_bar);
	pr_err("%-20s%016llx\n", "ghcb:", control->ghcb_gpa);
	pr_err("%-20s%08x\n", "event_inj:", control->event_inj);
	pr_err("%-20s%08x\n", "event_inj_err:", control->event_inj_err);
	pr_err("%-20s%lld\n", "misc_ctl2:", control->misc_ctl2);
	pr_err("%-20s%016llx\n", "next_rip:", control->next_rip);
	pr_err("%-20s%016llx\n", "avic_backing_page:", control->avic_backing_page);
	pr_err("%-20s%016llx\n", "avic_logical_id:", control->avic_logical_id);
	pr_err("%-20s%016llx\n", "avic_physical_id:", control->avic_physical_id);
	pr_err("%-20s%016llx\n", "vmsa_pa:", control->vmsa_pa);
	pr_err("%-20s%016llx\n", "allowed_sev_features:", control->allowed_sev_features);
	pr_err("%-20s%016llx\n", "guest_sev_features:", control->guest_sev_features);

	if (is_sev_es_guest(vcpu)) {
		save = sev_decrypt_vmsa(vcpu);
		if (!save)
			goto no_vmsa;

		save01 = save;
	}

	pr_err("VMCB State Save Area:\n");
	pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
	       "es:",
	       save->es.selector, save->es.attrib,
	       save->es.limit, save->es.base);
	pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
	       "cs:",
	       save->cs.selector, save->cs.attrib,
	       save->cs.limit, save->cs.base);
	pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
	       "ss:",
	       save->ss.selector, save->ss.attrib,
	       save->ss.limit, save->ss.base);
	pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
	       "ds:",
	       save->ds.selector, save->ds.attrib,
	       save->ds.limit, save->ds.base);
	pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
	       "fs:",
	       save01->fs.selector, save01->fs.attrib,
	       save01->fs.limit, save01->fs.base);
	pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
	       "gs:",
	       save01->gs.selector, save01->gs.attrib,
	       save01->gs.limit, save01->gs.base);
	pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
	       "gdtr:",
	       save->gdtr.selector, save->gdtr.attrib,
	       save->gdtr.limit, save->gdtr.base);
	pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
	       "ldtr:",
	       save01->ldtr.selector, save01->ldtr.attrib,
	       save01->ldtr.limit, save01->ldtr.base);
	pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
	       "idtr:",
	       save->idtr.selector, save->idtr.attrib,
	       save->idtr.limit, save->idtr.base);
	pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
	       "tr:",
	       save01->tr.selector, save01->tr.attrib,
	       save01->tr.limit, save01->tr.base);
	pr_err("vmpl: %d   cpl:  %d               efer:          %016llx\n",
	       save->vmpl, save->cpl, save->efer);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "cr0:", save->cr0, "cr2:", save->cr2);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "cr3:", save->cr3, "cr4:", save->cr4);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "dr6:", save->dr6, "dr7:", save->dr7);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "rip:", save->rip, "rflags:", save->rflags);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "rsp:", save->rsp, "rax:", save->rax);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "s_cet:", save->s_cet, "ssp:", save->ssp);
	pr_err("%-15s %016llx\n",
	       "isst_addr:", save->isst_addr);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "star:", save01->star, "lstar:", save01->lstar);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "cstar:", save01->cstar, "sfmask:", save01->sfmask);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "kernel_gs_base:", save01->kernel_gs_base,
	       "sysenter_cs:", save01->sysenter_cs);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "sysenter_esp:", save01->sysenter_esp,
	       "sysenter_eip:", save01->sysenter_eip);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "gpat:", save->g_pat, "dbgctl:", save->dbgctl);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "br_from:", save->br_from, "br_to:", save->br_to);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "excp_from:", save->last_excp_from,
	       "excp_to:", save->last_excp_to);

	if (is_sev_es_guest(vcpu)) {
		struct sev_es_save_area *vmsa = (struct sev_es_save_area *)save;

		pr_err("%-15s %016llx\n",
		       "sev_features", vmsa->sev_features);

		pr_err("%-15s %016llx %-13s %016llx\n",
		       "pl0_ssp:", vmsa->pl0_ssp, "pl1_ssp:", vmsa->pl1_ssp);
		pr_err("%-15s %016llx %-13s %016llx\n",
		       "pl2_ssp:", vmsa->pl2_ssp, "pl3_ssp:", vmsa->pl3_ssp);
		pr_err("%-15s %016llx\n",
		       "u_cet:", vmsa->u_cet);

		pr_err("%-15s %016llx %-13s %016llx\n",
		       "rax:", vmsa->rax, "rbx:", vmsa->rbx);
		pr_err("%-15s %016llx %-13s %016llx\n",
		       "rcx:", vmsa->rcx, "rdx:", vmsa->rdx);
		pr_err("%-15s %016llx %-13s %016llx\n",
		       "rsi:", vmsa->rsi, "rdi:", vmsa->rdi);
		pr_err("%-15s %016llx %-13s %016llx\n",
		       "rbp:", vmsa->rbp, "rsp:", vmsa->rsp);
		pr_err("%-15s %016llx %-13s %016llx\n",
		       "r8:", vmsa->r8, "r9:", vmsa->r9);
		pr_err("%-15s %016llx %-13s %016llx\n",
		       "r10:", vmsa->r10, "r11:", vmsa->r11);
		pr_err("%-15s %016llx %-13s %016llx\n",
		       "r12:", vmsa->r12, "r13:", vmsa->r13);
		pr_err("%-15s %016llx %-13s %016llx\n",
		       "r14:", vmsa->r14, "r15:", vmsa->r15);
		pr_err("%-15s %016llx %-13s %016llx\n",
		       "xcr0:", vmsa->xcr0, "xss:", vmsa->xss);
	} else {
		pr_err("%-15s %016llx %-13s %016lx\n",
		       "rax:", save->rax, "rbx:",
		       vcpu->arch.regs[VCPU_REGS_RBX]);
		pr_err("%-15s %016lx %-13s %016lx\n",
		       "rcx:", vcpu->arch.regs[VCPU_REGS_RCX],
		       "rdx:", vcpu->arch.regs[VCPU_REGS_RDX]);
		pr_err("%-15s %016lx %-13s %016lx\n",
		       "rsi:", vcpu->arch.regs[VCPU_REGS_RSI],
		       "rdi:", vcpu->arch.regs[VCPU_REGS_RDI]);
		pr_err("%-15s %016lx %-13s %016llx\n",
		       "rbp:", vcpu->arch.regs[VCPU_REGS_RBP],
		       "rsp:", save->rsp);
#ifdef CONFIG_X86_64
		pr_err("%-15s %016lx %-13s %016lx\n",
		       "r8:", vcpu->arch.regs[VCPU_REGS_R8],
		       "r9:", vcpu->arch.regs[VCPU_REGS_R9]);
		pr_err("%-15s %016lx %-13s %016lx\n",
		       "r10:", vcpu->arch.regs[VCPU_REGS_R10],
		       "r11:", vcpu->arch.regs[VCPU_REGS_R11]);
		pr_err("%-15s %016lx %-13s %016lx\n",
		       "r12:", vcpu->arch.regs[VCPU_REGS_R12],
		       "r13:", vcpu->arch.regs[VCPU_REGS_R13]);
		pr_err("%-15s %016lx %-13s %016lx\n",
		       "r14:", vcpu->arch.regs[VCPU_REGS_R14],
		       "r15:", vcpu->arch.regs[VCPU_REGS_R15]);
#endif
	}

no_vmsa:
	if (is_sev_es_guest(vcpu))
		sev_free_decrypted_vmsa(vcpu, save);
}

int svm_invoke_exit_handler(struct kvm_vcpu *vcpu, u64 __exit_code)
{
	u32 exit_code = __exit_code;

	/*
	 * SVM uses negative values, i.e. 64-bit values, to indicate that VMRUN
	 * failed.  Report all such errors to userspace (note, VMEXIT_INVALID,
	 * a.k.a. SVM_EXIT_ERR, is special cased by svm_handle_exit()).  Skip
	 * the check when running as a VM, as KVM has historically left garbage
	 * in bits 63:32, i.e. running KVM-on-KVM would hit false positives if
	 * the underlying kernel is buggy.
	 */
	if (!cpu_feature_enabled(X86_FEATURE_HYPERVISOR) &&
	    (u64)exit_code != __exit_code)
		goto unexpected_vmexit;

#ifdef CONFIG_MITIGATION_RETPOLINE
	if (exit_code == SVM_EXIT_MSR)
		return msr_interception(vcpu);
	else if (exit_code == SVM_EXIT_VINTR)
		return interrupt_window_interception(vcpu);
	else if (exit_code == SVM_EXIT_INTR)
		return intr_interception(vcpu);
	else if (exit_code == SVM_EXIT_HLT || exit_code == SVM_EXIT_IDLE_HLT)
		return kvm_emulate_halt(vcpu);
	else if (exit_code == SVM_EXIT_NPF)
		return npf_interception(vcpu);
#ifdef CONFIG_KVM_AMD_SEV
	else if (exit_code == SVM_EXIT_VMGEXIT)
		return sev_handle_vmgexit(vcpu);
#endif
#endif
	if (exit_code >= ARRAY_SIZE(svm_exit_handlers))
		goto unexpected_vmexit;

	exit_code = array_index_nospec(exit_code, ARRAY_SIZE(svm_exit_handlers));
	if (!svm_exit_handlers[exit_code])
		goto unexpected_vmexit;

	return svm_exit_handlers[exit_code](vcpu);

unexpected_vmexit:
	dump_vmcb(vcpu);
	kvm_prepare_unexpected_reason_exit(vcpu, __exit_code);
	return 0;
}

static void svm_get_exit_info(struct kvm_vcpu *vcpu, u32 *reason,
			      u64 *info1, u64 *info2,
			      u32 *intr_info, u32 *error_code)
{
	struct vmcb_control_area *control = &to_svm(vcpu)->vmcb->control;

	*reason = control->exit_code;
	*info1 = control->exit_info_1;
	*info2 = control->exit_info_2;
	*intr_info = control->exit_int_info;
	if ((*intr_info & SVM_EXITINTINFO_VALID) &&
	    (*intr_info & SVM_EXITINTINFO_VALID_ERR))
		*error_code = control->exit_int_info_err;
	else
		*error_code = 0;
}

static void svm_get_entry_info(struct kvm_vcpu *vcpu, u32 *intr_info,
			       u32 *error_code)
{
	struct vmcb_control_area *control = &to_svm(vcpu)->vmcb->control;

	*intr_info = control->event_inj;

	if ((*intr_info & SVM_EXITINTINFO_VALID) &&
	    (*intr_info & SVM_EXITINTINFO_VALID_ERR))
		*error_code = control->event_inj_err;
	else
		*error_code = 0;

}

static int svm_handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct kvm_run *kvm_run = vcpu->run;

	if (unlikely(exit_fastpath == EXIT_FASTPATH_EXIT_USERSPACE))
		return 0;

	if (is_guest_mode(vcpu)) {
		int vmexit;

		trace_kvm_nested_vmexit(vcpu, KVM_ISA_SVM);

		vmexit = nested_svm_exit_special(svm);

		if (vmexit == NESTED_EXIT_CONTINUE)
			vmexit = nested_svm_exit_handled(svm);

		if (vmexit == NESTED_EXIT_DONE)
			return 1;
	}

	if (svm_is_vmrun_failure(svm->vmcb->control.exit_code)) {
		kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
		kvm_run->fail_entry.hardware_entry_failure_reason
			= svm->vmcb->control.exit_code;
		kvm_run->fail_entry.cpu = vcpu->arch.last_vmentry_cpu;
		dump_vmcb(vcpu);
		return 0;
	}

	if (exit_fastpath != EXIT_FASTPATH_NONE)
		return 1;

	return svm_invoke_exit_handler(vcpu, svm->vmcb->control.exit_code);
}

static void svm_set_nested_run_soft_int_state(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	svm->soft_int_csbase = svm->vmcb->save.cs.base;
	svm->soft_int_old_rip = kvm_rip_read(vcpu);
	if (!guest_cpu_cap_has(vcpu, X86_FEATURE_NRIPS))
		svm->soft_int_next_rip = kvm_rip_read(vcpu);
}

static int pre_svm_run(struct kvm_vcpu *vcpu)
{
	struct svm_cpu_data *sd = per_cpu_ptr(&svm_data, vcpu->cpu);
	struct vcpu_svm *svm = to_svm(vcpu);

	/*
	 * If the previous vmrun of the vmcb occurred on a different physical
	 * cpu, then mark the vmcb dirty and assign a new asid.  Hardware's
	 * vmcb clean bits are per logical CPU, as are KVM's asid assignments.
	 */
	if (unlikely(svm->current_vmcb->cpu != vcpu->cpu)) {
		svm->current_vmcb->asid_generation = 0;
		vmcb_mark_all_dirty(svm->vmcb);
		svm->current_vmcb->cpu = vcpu->cpu;
        }

	if (is_sev_guest(vcpu))
		return pre_sev_run(svm, vcpu->cpu);

	/* FIXME: handle wraparound of asid_generation */
	if (svm->current_vmcb->asid_generation != sd->asid_generation)
		new_asid(svm, sd);

	return 0;
}

static void svm_inject_nmi(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	svm->vmcb->control.event_inj = SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_NMI;

	if (svm->nmi_l1_to_l2)
		return;

	/*
	 * No need to manually track NMI masking when vNMI is enabled, hardware
	 * automatically sets V_NMI_BLOCKING_MASK as appropriate, including the
	 * case where software directly injects an NMI.
	 */
	if (!is_vnmi_enabled(svm)) {
		svm->nmi_masked = true;
		svm_set_iret_intercept(svm);
	}
	++vcpu->stat.nmi_injections;
}

static bool svm_is_vnmi_pending(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	if (!is_vnmi_enabled(svm))
		return false;

	return !!(svm->vmcb->control.int_ctl & V_NMI_PENDING_MASK);
}

static bool svm_set_vnmi_pending(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	if (!is_vnmi_enabled(svm))
		return false;

	if (svm->vmcb->control.int_ctl & V_NMI_PENDING_MASK)
		return false;

	svm->vmcb->control.int_ctl |= V_NMI_PENDING_MASK;
	vmcb_mark_dirty(svm->vmcb, VMCB_INTR);

	/*
	 * Because the pending NMI is serviced by hardware, KVM can't know when
	 * the NMI is "injected", but for all intents and purposes, passing the
	 * NMI off to hardware counts as injection.
	 */
	++vcpu->stat.nmi_injections;

	return true;
}

static void svm_inject_irq(struct kvm_vcpu *vcpu, bool reinjected)
{
	struct kvm_queued_interrupt *intr = &vcpu->arch.interrupt;
	struct vcpu_svm *svm = to_svm(vcpu);
	u32 type;

	if (intr->soft) {
		if (svm_update_soft_interrupt_rip(vcpu, intr->nr))
			return;

		type = SVM_EVTINJ_TYPE_SOFT;
	} else {
		type = SVM_EVTINJ_TYPE_INTR;
	}

	/*
	 * If AVIC was inhibited in order to detect an IRQ window, and there's
	 * no other injectable interrupts pending or L2 is active (see below),
	 * then drop the inhibit as the window has served its purpose.
	 *
	 * If L2 is active, this path is reachable if L1 is not intercepting
	 * IRQs, i.e. if KVM is injecting L1 IRQs into L2.  AVIC is locally
	 * inhibited while L2 is active; drop the VM-wide inhibit to optimize
	 * the case in which the interrupt window was requested while L1 was
	 * active (the vCPU was not running nested).
	 */
	if (svm->avic_irq_window &&
	    (!kvm_cpu_has_injectable_intr(vcpu) || is_guest_mode(vcpu))) {
		svm->avic_irq_window = false;
		kvm_dec_apicv_irq_window_req(svm->vcpu.kvm);
	}

	trace_kvm_inj_virq(intr->nr, intr->soft, reinjected);
	++vcpu->stat.irq_injections;

	svm->vmcb->control.event_inj = intr->nr | SVM_EVTINJ_VALID | type;
}

static void svm_fixup_nested_rips(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	if (!is_guest_mode(vcpu) || !vcpu->arch.nested_run_pending)
		return;

	/*
	 * If nrips is supported in hardware but not exposed to L1, stuff the
	 * actual L2 RIP to emulate what a nrips=0 CPU would do (L1 is
	 * responsible for advancing RIP prior to injecting the event). Once L2
	 * runs after L1 executes VMRUN, NextRIP is updated by the CPU and/or
	 * KVM, and this is no longer needed.
	 *
	 * This is done here (as opposed to when preparing vmcb02) to use the
	 * most up-to-date value of RIP regardless of the order of restoring
	 * registers and nested state in the vCPU save+restore path.
	 */
	if (boot_cpu_has(X86_FEATURE_NRIPS) &&
	    !guest_cpu_cap_has(vcpu, X86_FEATURE_NRIPS))
		svm->vmcb->control.next_rip = kvm_rip_read(vcpu);

	/*
	 * Simiarly, initialize the soft int metadata here to use the most
	 * up-to-date values of RIP and CS base, regardless of restore order.
	 */
	if (svm->soft_int_injected)
		svm_set_nested_run_soft_int_state(vcpu);
}

void svm_complete_interrupt_delivery(struct kvm_vcpu *vcpu, int delivery_mode,
				     int trig_mode, int vector)
{
	/*
	 * apic->apicv_active must be read after vcpu->mode.
	 * Pairs with smp_store_release in vcpu_enter_guest.
	 */
	bool in_guest_mode = (smp_load_acquire(&vcpu->mode) == IN_GUEST_MODE);

	/* Note, this is called iff the local APIC is in-kernel. */
	if (!READ_ONCE(vcpu->arch.apic->apicv_active)) {
		/* Process the interrupt via kvm_check_and_inject_events(). */
		kvm_make_request(KVM_REQ_EVENT, vcpu);
		kvm_vcpu_kick(vcpu);
		return;
	}

	trace_kvm_apicv_accept_irq(vcpu->vcpu_id, delivery_mode, trig_mode, vector);
	if (in_guest_mode) {
		/*
		 * Signal the doorbell to tell hardware to inject the IRQ.  If
		 * the vCPU exits the guest before the doorbell chimes, hardware
		 * will automatically process AVIC interrupts at the next VMRUN.
		 */
		avic_ring_doorbell(vcpu);
	} else {
		/*
		 * Wake the vCPU if it was blocking.  KVM will then detect the
		 * pending IRQ when checking if the vCPU has a wake event.
		 */
		kvm_vcpu_wake_up(vcpu);
	}
}

static void svm_deliver_interrupt(struct kvm_lapic *apic,  int delivery_mode,
				  int trig_mode, int vector)
{
	kvm_lapic_set_irr(vector, apic);

	/*
	 * Pairs with the smp_mb_*() after setting vcpu->guest_mode in
	 * vcpu_enter_guest() to ensure the write to the vIRR is ordered before
	 * the read of guest_mode.  This guarantees that either VMRUN will see
	 * and process the new vIRR entry, or that svm_complete_interrupt_delivery
	 * will signal the doorbell if the CPU has already entered the guest.
	 */
	smp_mb__after_atomic();
	svm_complete_interrupt_delivery(apic->vcpu, delivery_mode, trig_mode, vector);
}

static void svm_update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	/*
	 * SEV-ES guests must always keep the CR intercepts cleared. CR
	 * tracking is done using the CR write traps.
	 */
	if (is_sev_es_guest(vcpu))
		return;

	if (nested_svm_virtualize_tpr(vcpu))
		return;

	svm_clr_intercept(svm, INTERCEPT_CR8_WRITE);

	if (irr == -1)
		return;

	if (tpr >= irr)
		svm_set_intercept(svm, INTERCEPT_CR8_WRITE);
}

static bool svm_get_nmi_mask(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	if (is_vnmi_enabled(svm))
		return svm->vmcb->control.int_ctl & V_NMI_BLOCKING_MASK;
	else
		return svm->nmi_masked;
}

static void svm_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	if (is_vnmi_enabled(svm)) {
		if (masked)
			svm->vmcb->control.int_ctl |= V_NMI_BLOCKING_MASK;
		else
			svm->vmcb->control.int_ctl &= ~V_NMI_BLOCKING_MASK;

	} else {
		svm->nmi_masked = masked;
		if (masked)
			svm_set_iret_intercept(svm);
		else
			svm_clr_iret_intercept(svm);
	}
}

bool svm_nmi_blocked(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb *vmcb = svm->vmcb;

	if (!gif_set(svm))
		return true;

	if (is_guest_mode(vcpu) && nested_exit_on_nmi(svm))
		return false;

	if (svm_get_nmi_mask(vcpu))
		return true;

	return vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK;
}

static int svm_nmi_allowed(struct kvm_vcpu *vcpu, bool for_injection)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	if (vcpu->arch.nested_run_pending)
		return -EBUSY;

	if (svm_nmi_blocked(vcpu))
		return 0;

	/* An NMI must not be injected into L2 if it's supposed to VM-Exit.  */
	if (for_injection && is_guest_mode(vcpu) && nested_exit_on_nmi(svm))
		return -EBUSY;
	return 1;
}

bool svm_interrupt_blocked(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb *vmcb = svm->vmcb;

	if (!gif_set(svm))
		return true;

	if (is_guest_mode(vcpu)) {
		/* As long as interrupts are being delivered...  */
		if ((svm->nested.ctl.int_ctl & V_INTR_MASKING_MASK)
		    ? !(svm->vmcb01.ptr->save.rflags & X86_EFLAGS_IF)
		    : !(kvm_get_rflags(vcpu) & X86_EFLAGS_IF))
			return true;

		/* ... vmexits aren't blocked by the interrupt shadow  */
		if (nested_exit_on_intr(svm))
			return false;
	} else {
		if (!svm_get_if_flag(vcpu))
			return true;
	}

	return (vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK);
}

static int svm_interrupt_allowed(struct kvm_vcpu *vcpu, bool for_injection)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	if (svm_interrupt_blocked(vcpu))
		return 0;

	if (vcpu->arch.nested_run_pending)
		return -EBUSY;

	/*
	 * An IRQ must not be injected into L2 if it's supposed to VM-Exit,
	 * e.g. if the IRQ arrived asynchronously after checking nested events.
	 */
	if (for_injection && is_guest_mode(vcpu) && nested_exit_on_intr(svm))
		return -EBUSY;

	return 1;
}

static void svm_enable_irq_window(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	/*
	 * In case GIF=0 we can't rely on the CPU to tell us when GIF becomes
	 * 1, because that's a separate STGI/VMRUN intercept.  The next time we
	 * get that intercept, this function will be called again though and
	 * we'll get the vintr intercept. However, if the vGIF feature is
	 * enabled, the STGI interception will not occur. Enable the irq
	 * window under the assumption that the hardware will set the GIF.
	 */
	if (vgif || gif_set(svm)) {
		/*
		 * KVM only enables IRQ windows when AVIC is enabled if there's
		 * pending ExtINT since it cannot be injected via AVIC (ExtINT
		 * bypasses the local APIC).  V_IRQ is ignored by hardware when
		 * AVIC is enabled, and so KVM needs to temporarily disable
		 * AVIC in order to detect when it's ok to inject the ExtINT.
		 *
		 * If running nested, AVIC is already locally inhibited on this
		 * vCPU (L2 vCPUs use a different MMU that never maps the AVIC
		 * backing page), therefore there is no need to increment the
		 * VM-wide AVIC inhibit.  KVM will re-evaluate events when the
		 * vCPU exits to L1 and enable an IRQ window if the ExtINT is
		 * still pending.
		 *
		 * Note, the IRQ window inhibit needs to be updated even if
		 * AVIC is inhibited for a different reason, as KVM needs to
		 * keep AVIC inhibited if the other reason is cleared and there
		 * is still an injectable interrupt pending.
		 */
		if (enable_apicv && !svm->avic_irq_window && !is_guest_mode(vcpu)) {
			svm->avic_irq_window = true;
			kvm_inc_apicv_irq_window_req(vcpu->kvm);
		}

		svm_set_vintr(svm);
	}
}

static void svm_enable_nmi_window(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	/*
	 * If NMIs are outright masked, i.e. the vCPU is already handling an
	 * NMI, and KVM has not yet intercepted an IRET, then there is nothing
	 * more to do at this time as KVM has already enabled IRET intercepts.
	 * If KVM has already intercepted IRET, then single-step over the IRET,
	 * as NMIs aren't architecturally unmasked until the IRET completes.
	 *
	 * If vNMI is enabled, KVM should never request an NMI window if NMIs
	 * are masked, as KVM allows at most one to-be-injected NMI and one
	 * pending NMI.  If two NMIs arrive simultaneously, KVM will inject one
	 * NMI and set V_NMI_PENDING for the other, but if and only if NMIs are
	 * unmasked.  KVM _will_ request an NMI window in some situations, e.g.
	 * if the vCPU is in an STI shadow or if GIF=0, KVM can't immediately
	 * inject the NMI.  In those situations, KVM needs to single-step over
	 * the STI shadow or intercept STGI.
	 */
	if (svm_get_nmi_mask(vcpu)) {
		WARN_ON_ONCE(is_vnmi_enabled(svm));

		if (!svm->awaiting_iret_completion)
			return; /* IRET will cause a vm exit */
	}

	/*
	 * SEV-ES guests are responsible for signaling when a vCPU is ready to
	 * receive a new NMI, as SEV-ES guests can't be single-stepped, i.e.
	 * KVM can't intercept and single-step IRET to detect when NMIs are
	 * unblocked (architecturally speaking).  See SVM_VMGEXIT_NMI_COMPLETE.
	 *
	 * Note, GIF is guaranteed to be '1' for SEV-ES guests as hardware
	 * ignores SEV-ES guest writes to EFER.SVME *and* CLGI/STGI are not
	 * supported NAEs in the GHCB protocol.
	 */
	if (is_sev_es_guest(vcpu))
		return;

	if (!gif_set(svm)) {
		if (vgif)
			svm_set_intercept(svm, INTERCEPT_STGI);
		return; /* STGI will cause a vm exit */
	}

	/*
	 * Something prevents NMI from been injected. Single step over possible
	 * problem (IRET or exception injection or interrupt shadow)
	 */
	svm->nmi_singlestep_guest_rflags = svm_get_rflags(vcpu);
	svm->nmi_singlestep = true;
	svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);
}

static void svm_flush_tlb_asid(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	/*
	 * Unlike VMX, SVM doesn't provide a way to flush only NPT TLB entries.
	 * A TLB flush for the current ASID flushes both "host" and "guest" TLB
	 * entries, and thus is a superset of Hyper-V's fine grained flushing.
	 */
	kvm_hv_vcpu_purge_flush_tlb(vcpu);

	/*
	 * Flush only the current ASID even if the TLB flush was invoked via
	 * kvm_flush_remote_tlbs().  Although flushing remote TLBs requires all
	 * ASIDs to be flushed, KVM uses a single ASID for L1 and L2, and
	 * unconditionally does a TLB flush on both nested VM-Enter and nested
	 * VM-Exit (via kvm_mmu_reset_context()).
	 */
	if (cpu_feature_enabled(X86_FEATURE_FLUSHBYASID))
		svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ASID;
	else
		svm->current_vmcb->asid_generation--;
}

static void svm_flush_tlb_current(struct kvm_vcpu *vcpu)
{
	hpa_t root_tdp = vcpu->arch.mmu->root.hpa;

	/*
	 * When running on Hyper-V with EnlightenedNptTlb enabled, explicitly
	 * flush the NPT mappings via hypercall as flushing the ASID only
	 * affects virtual to physical mappings, it does not invalidate guest
	 * physical to host physical mappings.
	 */
	if (svm_hv_is_enlightened_tlb_enabled(vcpu) && VALID_PAGE(root_tdp))
		hyperv_flush_guest_mapping(root_tdp);

	svm_flush_tlb_asid(vcpu);
}

static void svm_flush_tlb_all(struct kvm_vcpu *vcpu)
{
	/*
	 * When running on Hyper-V with EnlightenedNptTlb enabled, remote TLB
	 * flushes should be routed to hv_flush_remote_tlbs() without requesting
	 * a "regular" remote flush.  Reaching this point means either there's
	 * a KVM bug or a prior hv_flush_remote_tlbs() call failed, both of
	 * which might be fatal to the guest.  Yell, but try to recover.
	 */
	if (WARN_ON_ONCE(svm_hv_is_enlightened_tlb_enabled(vcpu)))
		hv_flush_remote_tlbs(vcpu->kvm);

	svm_flush_tlb_asid(vcpu);
}

static void svm_flush_tlb_guest(struct kvm_vcpu *vcpu)
{
	kvm_register_mark_dirty(vcpu, VCPU_REG_ERAPS);

	svm_flush_tlb_asid(vcpu);
}

static void svm_flush_tlb_gva(struct kvm_vcpu *vcpu, gva_t gva, bool *full)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	/*
	 * INVLPGA has had errata on Genoa and Turin, and even on older
	 * generations there were reports of Windows BSODs if INVLPGA
	 * was used for Hyper-V tlbflush.  Use it only for shadow paging
	 * where it seems to be okay.
	 */
	if (!npt_enabled) {
		invlpga(gva, svm->vmcb->control.asid);
		return;
	}

	svm_flush_tlb_guest(vcpu);
	if (full)
		*full = true;
}

static inline void sync_cr8_to_lapic(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	if (nested_svm_virtualize_tpr(vcpu))
		return;

	if (!svm_is_intercept(svm, INTERCEPT_CR8_WRITE)) {
		int cr8 = svm->vmcb->control.int_ctl & V_TPR_MASK;
		kvm_set_cr8(vcpu, cr8);
	}
}

static inline void sync_lapic_to_cr8(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	u64 cr8;

	if (nested_svm_virtualize_tpr(vcpu))
		return;

	cr8 = kvm_get_cr8(vcpu);
	svm->vmcb->control.int_ctl &= ~V_TPR_MASK;
	svm->vmcb->control.int_ctl |= cr8 & V_TPR_MASK;
}

static void svm_complete_soft_interrupt(struct kvm_vcpu *vcpu, u8 vector,
					int type)
{
	bool is_exception = (type == SVM_EXITINTINFO_TYPE_EXEPT);
	bool is_soft = (type == SVM_EXITINTINFO_TYPE_SOFT);
	struct vcpu_svm *svm = to_svm(vcpu);

	/*
	 * Initialize the soft int fields *before* reading them below if KVM
	 * aborted entry to the guest with a nested VMRUN pending.  To ensure
	 * KVM uses up-to-date values for RIP and CS base across save/restore,
	 * regardless of restore order, KVM waits to set the soft int fields
	 * until VMRUN is imminent.  But when canceling injection, KVM requeues
	 * the soft int and will reinject it via the standard injection flow,
	 * and so KVM needs to grab the state from the pending nested VMRUN.
	 */
	if (is_guest_mode(vcpu) && vcpu->arch.nested_run_pending)
		svm_set_nested_run_soft_int_state(vcpu);

	/*
	 * If NRIPS is enabled, KVM must snapshot the pre-VMRUN next_rip that's
	 * associated with the original soft exception/interrupt.  next_rip is
	 * cleared on all exits that can occur while vectoring an event, so KVM
	 * needs to manually set next_rip for re-injection.  Unlike the !nrips
	 * case below, this needs to be done if and only if KVM is re-injecting
	 * the same event, i.e. if the event is a soft exception/interrupt,
	 * otherwise next_rip is unused on VMRUN.
	 */
	if (nrips && (is_soft || (is_exception && kvm_exception_is_soft(vector))) &&
	    kvm_is_linear_rip(vcpu, svm->soft_int_old_rip + svm->soft_int_csbase))
		svm->vmcb->control.next_rip = svm->soft_int_next_rip;
	/*
	 * If NRIPS isn't enabled, KVM must manually advance RIP prior to
	 * injecting the soft exception/interrupt.  That advancement needs to
	 * be unwound if vectoring didn't complete.  Note, the new event may
	 * not be the injected event, e.g. if KVM injected an INTn, the INTn
	 * hit a #NP in the guest, and the #NP encountered a #PF, the #NP will
	 * be the reported vectored event, but RIP still needs to be unwound.
	 */
	else if (!nrips && (is_soft || is_exception) &&
		 kvm_is_linear_rip(vcpu, svm->soft_int_next_rip + svm->soft_int_csbase))
		kvm_rip_write(vcpu, svm->soft_int_old_rip);
}

static void svm_complete_interrupts(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	u8 vector;
	int type;
	u32 exitintinfo = svm->vmcb->control.exit_int_info;
	bool nmi_l1_to_l2 = svm->nmi_l1_to_l2;
	bool soft_int_injected = svm->soft_int_injected;

	svm->nmi_l1_to_l2 = false;
	svm->soft_int_injected = false;

	/*
	 * If we've made progress since setting awaiting_iret_completion, we've
	 * executed an IRET and can allow NMI injection.
	 */
	if (svm->awaiting_iret_completion &&
	    kvm_rip_read(vcpu) != svm->nmi_iret_rip) {
		svm->awaiting_iret_completion = false;
		svm->nmi_masked = false;
		kvm_make_request(KVM_REQ_EVENT, vcpu);
	}

	vcpu->arch.nmi_injected = false;
	kvm_clear_exception_queue(vcpu);
	kvm_clear_interrupt_queue(vcpu);

	if (!(exitintinfo & SVM_EXITINTINFO_VALID))
		return;

	kvm_make_request(KVM_REQ_EVENT, vcpu);

	vector = exitintinfo & SVM_EXITINTINFO_VEC_MASK;
	type = exitintinfo & SVM_EXITINTINFO_TYPE_MASK;

	if (soft_int_injected)
		svm_complete_soft_interrupt(vcpu, vector, type);

	switch (type) {
	case SVM_EXITINTINFO_TYPE_NMI:
		vcpu->arch.nmi_injected = true;
		svm->nmi_l1_to_l2 = nmi_l1_to_l2;
		break;
	case SVM_EXITINTINFO_TYPE_EXEPT: {
		u32 error_code = 0;

		/*
		 * Never re-inject a #VC exception.
		 */
		if (vector == X86_TRAP_VC)
			break;

		if (exitintinfo & SVM_EXITINTINFO_VALID_ERR)
			error_code = svm->vmcb->control.exit_int_info_err;

		kvm_requeue_exception(vcpu, vector,
				      exitintinfo & SVM_EXITINTINFO_VALID_ERR,
				      error_code);
		break;
	}
	case SVM_EXITINTINFO_TYPE_INTR:
		kvm_queue_interrupt(vcpu, vector, false);
		break;
	case SVM_EXITINTINFO_TYPE_SOFT:
		kvm_queue_interrupt(vcpu, vector, true);
		break;
	default:
		break;
	}

}

static void svm_cancel_injection(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb_control_area *control = &svm->vmcb->control;

	control->exit_int_info = control->event_inj;
	control->exit_int_info_err = control->event_inj_err;
	control->event_inj = 0;
	svm_complete_interrupts(vcpu);
}

static fastpath_t svm_exit_handlers_fastpath(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb_control_area *control = &svm->vmcb->control;

	/*
	 * Next RIP must be provided as IRQs are disabled, and accessing guest
	 * memory to decode the instruction might fault, i.e. might sleep.
	 */
	if (!nrips || !control->next_rip)
		return EXIT_FASTPATH_NONE;

	if (is_guest_mode(vcpu))
		return EXIT_FASTPATH_NONE;

	switch (control->exit_code) {
	case SVM_EXIT_MSR:
		if (!control->exit_info_1)
			break;
		return handle_fastpath_wrmsr(vcpu);
	case SVM_EXIT_HLT:
		return handle_fastpath_hlt(vcpu);
	case SVM_EXIT_INVD:
		return handle_fastpath_invd(vcpu);
	default:
		break;
	}

	return EXIT_FASTPATH_NONE;
}

static noinstr void svm_vcpu_enter_exit(struct kvm_vcpu *vcpu, unsigned enter_flags)
{
	struct svm_cpu_data *sd = per_cpu_ptr(&svm_data, vcpu->cpu);
	struct vcpu_svm *svm = to_svm(vcpu);

	guest_state_enter_irqoff();

	/*
	 * Set RFLAGS.IF prior to VMRUN, as the host's RFLAGS.IF at the time of
	 * VMRUN controls whether or not physical IRQs are masked (KVM always
	 * runs with V_INTR_MASKING_MASK).  Toggle RFLAGS.IF here to avoid the
	 * temptation to do STI+VMRUN+CLI, as AMD CPUs bleed the STI shadow
	 * into guest state if delivery of an event during VMRUN triggers a
	 * #VMEXIT, and the guest_state transitions already tell lockdep that
	 * IRQs are being enabled/disabled.  Note!  GIF=0 for the entirety of
	 * this path, so IRQs aren't actually unmasked while running host code.
	 */
	raw_local_irq_enable();

	amd_clear_divider();

	if (is_sev_es_guest(vcpu))
		__svm_sev_es_vcpu_run(svm, enter_flags,
				      sev_es_host_save_area(sd));
	else
		__svm_vcpu_run(svm, enter_flags);

	raw_local_irq_disable();

	guest_state_exit_irqoff();
}

static __no_kcsan fastpath_t svm_vcpu_run(struct kvm_vcpu *vcpu, u64 run_flags)
{
	bool force_immediate_exit = run_flags & KVM_RUN_FORCE_IMMEDIATE_EXIT;
	struct vcpu_svm *svm = to_svm(vcpu);
	unsigned enter_flags = 0;

	if (!msr_write_intercepted(svm, MSR_IA32_SPEC_CTRL))
		enter_flags |= KVM_ENTER_SAVE_SPEC_CTRL;

	trace_kvm_entry(vcpu, force_immediate_exit);

	svm->vmcb->save.rax = vcpu->arch.regs[VCPU_REGS_RAX];
	svm->vmcb->save.rsp = vcpu->arch.regs[VCPU_REGS_RSP];
	svm->vmcb->save.rip = vcpu->arch.rip;

	/*
	 * Disable singlestep if we're injecting an interrupt/exception.
	 * We don't want our modified rflags to be pushed on the stack where
	 * we might not be able to easily reset them if we disabled NMI
	 * singlestep later.
	 */
	if (svm->nmi_singlestep && svm->vmcb->control.event_inj) {
		/*
		 * Event injection happens before external interrupts cause a
		 * vmexit and interrupts are disabled here, so smp_send_reschedule
		 * is enough to force an immediate vmexit.
		 */
		disable_nmi_singlestep(svm);
		force_immediate_exit = true;
	}

	if (force_immediate_exit)
		smp_send_reschedule(vcpu->cpu);

	if (pre_svm_run(vcpu)) {
		vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY;
		vcpu->run->fail_entry.hardware_entry_failure_reason = SVM_EXIT_ERR;
		vcpu->run->fail_entry.cpu = vcpu->cpu;
		return EXIT_FASTPATH_EXIT_USERSPACE;
	}

	sync_lapic_to_cr8(vcpu);

	if (unlikely(svm->asid != svm->vmcb->control.asid)) {
		svm->vmcb->control.asid = svm->asid;
		vmcb_mark_dirty(svm->vmcb, VMCB_ASID);
	}
	if (this_cpu_ptr(&svm_data)->flush_all_asids)
		svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID;

	svm->vmcb->save.cr2 = vcpu->arch.cr2;

	if (guest_cpu_cap_has(vcpu, X86_FEATURE_ERAPS) &&
	    kvm_register_is_dirty(vcpu, VCPU_REG_ERAPS))
		svm->vmcb->control.erap_ctl |= ERAP_CONTROL_CLEAR_RAP;

	svm_fixup_nested_rips(vcpu);

	svm_hv_update_vp_id(svm->vmcb, vcpu);

	/*
	 * Run with all-zero DR6 unless the guest can write DR6 freely, so that
	 * KVM can get the exact cause of a #DB.  Note, loading guest DR6 from
	 * KVM's snapshot is only necessary when DR accesses won't exit.
	 */
	if (unlikely(run_flags & KVM_RUN_LOAD_GUEST_DR6))
		svm_set_dr6(vcpu, vcpu->arch.dr6);
	else if (likely(!(vcpu->arch.switch_db_regs & KVM_DEBUGREG_WONT_EXIT)))
		svm_set_dr6(vcpu, DR6_ACTIVE_LOW);

	clgi();

	/*
	 * Hardware only context switches DEBUGCTL if LBR virtualization is
	 * enabled.  Manually load DEBUGCTL if necessary (and restore it after
	 * VM-Exit), as running with the host's DEBUGCTL can negatively affect
	 * guest state and can even be fatal, e.g. due to Bus Lock Detect.
	 */
	if (!(svm->vmcb->control.misc_ctl2 & SVM_MISC2_ENABLE_V_LBR) &&
	    vcpu->arch.host_debugctl != svm->vmcb->save.dbgctl)
		update_debugctlmsr(svm->vmcb->save.dbgctl);

	kvm_wait_lapic_expire(vcpu);

	/*
	 * If this vCPU has touched SPEC_CTRL, restore the guest's value if
	 * it's non-zero. Since vmentry is serialising on affected CPUs, there
	 * is no need to worry about the conditional branch over the wrmsr
	 * being speculatively taken.
	 */
	if (!cpu_feature_enabled(X86_FEATURE_V_SPEC_CTRL))
		x86_spec_ctrl_set_guest(svm->virt_spec_ctrl);

	svm_vcpu_enter_exit(vcpu, enter_flags);

	if (!cpu_feature_enabled(X86_FEATURE_V_SPEC_CTRL))
		x86_spec_ctrl_restore_host(svm->virt_spec_ctrl);

	/* SEV-ES guests must use the CR write traps to track CR registers. */
	if (!is_sev_es_guest(vcpu)) {
		vcpu->arch.cr2 = svm->vmcb->save.cr2;
		vcpu->arch.regs[VCPU_REGS_RAX] = svm->vmcb->save.rax;
		vcpu->arch.regs[VCPU_REGS_RSP] = svm->vmcb->save.rsp;
		vcpu->arch.rip = svm->vmcb->save.rip;

		if (!svm_is_intercept(svm, INTERCEPT_CR0_WRITE))
			vcpu->arch.cr0 = svm->vmcb->save.cr0;
		if (npt_enabled)
			vcpu->arch.cr3 = svm->vmcb->save.cr3;
	}
	kvm_reset_dirty_registers(vcpu);

	if (unlikely(svm->vmcb->control.exit_code == SVM_EXIT_NMI))
		kvm_before_interrupt(vcpu, KVM_HANDLING_NMI);

	if (!(svm->vmcb->control.misc_ctl2 & SVM_MISC2_ENABLE_V_LBR) &&
	    vcpu->arch.host_debugctl != svm->vmcb->save.dbgctl)
		update_debugctlmsr(vcpu->arch.host_debugctl);

	stgi();

	/* Any pending NMI will happen here */

	if (unlikely(svm->vmcb->control.exit_code == SVM_EXIT_NMI))
		kvm_after_interrupt(vcpu);

	sync_cr8_to_lapic(vcpu);

	svm->next_rip = 0;
	if (is_guest_mode(vcpu)) {
		nested_sync_control_from_vmcb02(svm);

		/* Track VMRUNs that have made past consistency checking */
		if (vcpu->arch.nested_run_pending &&
		    !svm_is_vmrun_failure(svm->vmcb->control.exit_code))
                        ++vcpu->stat.nested_run;

		vcpu->arch.nested_run_pending = 0;
	}

	if (!svm_is_vmrun_failure(svm->vmcb->control.exit_code)) {
		this_cpu_ptr(&svm_data)->flush_all_asids = false;
		svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING;

		/*
		 * Unconditionally mask off the CLEAR_RAP bit, the AND is just
		 * as cheap as the TEST+Jcc to avoid it.
		 */
		if (cpu_feature_enabled(X86_FEATURE_ERAPS))
			svm->vmcb->control.erap_ctl &= ~ERAP_CONTROL_CLEAR_RAP;

		vmcb_mark_all_clean(svm->vmcb);

		if (!msr_write_intercepted(svm, MSR_AMD64_PERF_CNTR_GLOBAL_CTL))
			rdmsrq(MSR_AMD64_PERF_CNTR_GLOBAL_CTL,
			       vcpu_to_pmu(vcpu)->global_ctrl);
	}

	/* if exit due to PF check for async PF */
	if (svm->vmcb->control.exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR)
		vcpu->arch.apf.host_apf_flags =
			kvm_read_and_reset_apf_flags();

	kvm_clear_available_registers(vcpu, SVM_REGS_LAZY_LOAD_SET);

	trace_kvm_exit(vcpu, KVM_ISA_SVM);

	svm_complete_interrupts(vcpu);

	/*
	 * Update the cache after completing interrupts to get an accurate
	 * NextRIP, e.g. when re-injecting a soft interrupt.
	 *
	 * FIXME: Rework svm_get_nested_state() to not pull data from the
	 *        cache (except for maybe int_ctl).
	 */
	if (is_guest_mode(vcpu))
		svm->nested.ctl.next_rip = svm->vmcb->control.next_rip;

	return svm_exit_handlers_fastpath(vcpu);
}

static void svm_load_mmu_pgd(struct kvm_vcpu *vcpu, hpa_t root_hpa,
			     int root_level)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	unsigned long cr3;

	if (npt_enabled) {
		svm->vmcb->control.nested_cr3 = __sme_set(root_hpa);
		vmcb_mark_dirty(svm->vmcb, VMCB_NPT);

		hv_track_root_tdp(vcpu, root_hpa);

		cr3 = vcpu->arch.cr3;
	} else if (root_level >= PT64_ROOT_4LEVEL) {
		cr3 = __sme_set(root_hpa) | kvm_get_active_pcid(vcpu);
	} else {
		/* PCID in the guest should be impossible with a 32-bit MMU. */
		WARN_ON_ONCE(kvm_get_active_pcid(vcpu));
		cr3 = root_hpa;
	}

	svm->vmcb->save.cr3 = cr3;
	vmcb_mark_dirty(svm->vmcb, VMCB_CR);
}

static void
svm_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
{
	/*
	 * Patch in the VMMCALL instruction:
	 */
	hypercall[0] = 0x0f;
	hypercall[1] = 0x01;
	hypercall[2] = 0xd9;
}

static bool svm_tdp_has_smep(struct kvm *kvm)
{
	return gmet_enabled;
}

/*
 * The kvm parameter can be NULL (module initialization, or invocation before
 * VM creation). Be sure to check the kvm parameter before using it.
 */
static bool svm_has_emulated_msr(struct kvm *kvm, u32 index)
{
	switch (index) {
	case MSR_IA32_MCG_EXT_CTL:
	case KVM_FIRST_EMULATED_VMX_MSR ... KVM_LAST_EMULATED_VMX_MSR:
		return false;
	case MSR_IA32_SMBASE:
		if (!IS_ENABLED(CONFIG_KVM_SMM))
			return false;

#ifdef CONFIG_KVM_AMD_SEV
		/*
		 * KVM can't access register state to emulate SMM for SEV-ES
		 * guests.  Conusming stale data here is "fine", as KVM only
		 * checks for MSR_IA32_SMBASE support without a vCPU when
		 * userspace is querying KVM_CAP_X86_SMM.
		 */
		if (kvm && ____sev_es_guest(kvm))
			return false;
#endif
		break;
	default:
		break;
	}

	return true;
}

static void svm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	/*
	 * SVM doesn't provide a way to disable just XSAVES in the guest, KVM
	 * can only disable all variants of by disallowing CR4.OSXSAVE from
	 * being set.  As a result, if the host has XSAVE and XSAVES, and the
	 * guest has XSAVE enabled, the guest can execute XSAVES without
	 * faulting.  Treat XSAVES as enabled in this case regardless of
	 * whether it's advertised to the guest so that KVM context switches
	 * XSS on VM-Enter/VM-Exit.  Failure to do so would effectively give
	 * the guest read/write access to the host's XSS.
	 */
	guest_cpu_cap_change(vcpu, X86_FEATURE_XSAVES,
			     boot_cpu_has(X86_FEATURE_XSAVES) &&
			     guest_cpu_cap_has(vcpu, X86_FEATURE_XSAVE));

	/*
	 * Intercept VMLOAD if the vCPU model is Intel in order to emulate that
	 * VMLOAD drops bits 63:32 of SYSENTER (ignoring the fact that exposing
	 * SVM on Intel is bonkers and extremely unlikely to work).
	 */
	if (guest_cpuid_is_intel_compatible(vcpu))
		guest_cpu_cap_clear(vcpu, X86_FEATURE_V_VMSAVE_VMLOAD);

	if (is_sev_guest(vcpu))
		sev_vcpu_after_set_cpuid(svm);
}

static bool svm_has_wbinvd_exit(void)
{
	return true;
}

#define PRE_EX(exit)  { .exit_code = (exit), \
			.stage = X86_ICPT_PRE_EXCEPT, }
#define POST_EX(exit) { .exit_code = (exit), \
			.stage = X86_ICPT_POST_EXCEPT, }
#define POST_MEM(exit) { .exit_code = (exit), \
			.stage = X86_ICPT_POST_MEMACCESS, }

static const struct __x86_intercept {
	u32 exit_code;
	enum x86_intercept_stage stage;
} x86_intercept_map[] = {
	[x86_intercept_cr_read]		= POST_EX(SVM_EXIT_READ_CR0),
	[x86_intercept_cr_write]	= POST_EX(SVM_EXIT_WRITE_CR0),
	[x86_intercept_clts]		= POST_EX(SVM_EXIT_WRITE_CR0),
	[x86_intercept_lmsw]		= POST_EX(SVM_EXIT_WRITE_CR0),
	[x86_intercept_smsw]		= POST_EX(SVM_EXIT_READ_CR0),
	[x86_intercept_dr_read]		= POST_EX(SVM_EXIT_READ_DR0),
	[x86_intercept_dr_write]	= POST_EX(SVM_EXIT_WRITE_DR0),
	[x86_intercept_sldt]		= POST_EX(SVM_EXIT_LDTR_READ),
	[x86_intercept_str]		= POST_EX(SVM_EXIT_TR_READ),
	[x86_intercept_lldt]		= POST_EX(SVM_EXIT_LDTR_WRITE),
	[x86_intercept_ltr]		= POST_EX(SVM_EXIT_TR_WRITE),
	[x86_intercept_sgdt]		= POST_EX(SVM_EXIT_GDTR_READ),
	[x86_intercept_sidt]		= POST_EX(SVM_EXIT_IDTR_READ),
	[x86_intercept_lgdt]		= POST_EX(SVM_EXIT_GDTR_WRITE),
	[x86_intercept_lidt]		= POST_EX(SVM_EXIT_IDTR_WRITE),
	[x86_intercept_vmrun]		= POST_EX(SVM_EXIT_VMRUN),
	[x86_intercept_vmmcall]		= POST_EX(SVM_EXIT_VMMCALL),
	[x86_intercept_vmload]		= POST_EX(SVM_EXIT_VMLOAD),
	[x86_intercept_vmsave]		= POST_EX(SVM_EXIT_VMSAVE),
	[x86_intercept_stgi]		= POST_EX(SVM_EXIT_STGI),
	[x86_intercept_clgi]		= POST_EX(SVM_EXIT_CLGI),
	[x86_intercept_skinit]		= POST_EX(SVM_EXIT_SKINIT),
	[x86_intercept_invlpga]		= POST_EX(SVM_EXIT_INVLPGA),
	[x86_intercept_rdtscp]		= POST_EX(SVM_EXIT_RDTSCP),
	[x86_intercept_monitor]		= POST_MEM(SVM_EXIT_MONITOR),
	[x86_intercept_mwait]		= POST_EX(SVM_EXIT_MWAIT),
	[x86_intercept_invlpg]		= POST_EX(SVM_EXIT_INVLPG),
	[x86_intercept_invd]		= POST_EX(SVM_EXIT_INVD),
	[x86_intercept_wbinvd]		= POST_EX(SVM_EXIT_WBINVD),
	[x86_intercept_wrmsr]		= POST_EX(SVM_EXIT_MSR),
	[x86_intercept_rdtsc]		= POST_EX(SVM_EXIT_RDTSC),
	[x86_intercept_rdmsr]		= POST_EX(SVM_EXIT_MSR),
	[x86_intercept_rdpmc]		= POST_EX(SVM_EXIT_RDPMC),
	[x86_intercept_cpuid]		= PRE_EX(SVM_EXIT_CPUID),
	[x86_intercept_rsm]		= PRE_EX(SVM_EXIT_RSM),
	[x86_intercept_pause]		= PRE_EX(SVM_EXIT_PAUSE),
	[x86_intercept_pushf]		= PRE_EX(SVM_EXIT_PUSHF),
	[x86_intercept_popf]		= PRE_EX(SVM_EXIT_POPF),
	[x86_intercept_intn]		= PRE_EX(SVM_EXIT_SWINT),
	[x86_intercept_iret]		= PRE_EX(SVM_EXIT_IRET),
	[x86_intercept_icebp]		= PRE_EX(SVM_EXIT_ICEBP),
	[x86_intercept_hlt]		= POST_EX(SVM_EXIT_HLT),
	[x86_intercept_in]		= POST_EX(SVM_EXIT_IOIO),
	[x86_intercept_ins]		= POST_EX(SVM_EXIT_IOIO),
	[x86_intercept_out]		= POST_EX(SVM_EXIT_IOIO),
	[x86_intercept_outs]		= POST_EX(SVM_EXIT_IOIO),
	[x86_intercept_xsetbv]		= PRE_EX(SVM_EXIT_XSETBV),
};

#undef PRE_EX
#undef POST_EX
#undef POST_MEM

static int svm_check_intercept(struct kvm_vcpu *vcpu,
			       struct x86_instruction_info *info,
			       enum x86_intercept_stage stage,
			       struct x86_exception *exception)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	int vmexit, ret = X86EMUL_CONTINUE;
	struct __x86_intercept icpt_info;
	struct vmcb *vmcb = svm->vmcb;

	if (info->intercept >= ARRAY_SIZE(x86_intercept_map))
		goto out;

	icpt_info = x86_intercept_map[info->intercept];

	if (stage != icpt_info.stage)
		goto out;

	switch (icpt_info.exit_code) {
	case SVM_EXIT_READ_CR0:
		if (info->intercept == x86_intercept_cr_read)
			icpt_info.exit_code += info->modrm_reg;
		break;
	case SVM_EXIT_WRITE_CR0: {
		unsigned long cr0, val;

		/*
		 * Adjust the exit code accordingly if a CR other than CR0 is
		 * being written, and skip straight to the common handling as
		 * only CR0 has an additional selective intercept.
		 */
		if (info->intercept == x86_intercept_cr_write && info->modrm_reg) {
			icpt_info.exit_code += info->modrm_reg;
			break;
		}

		/*
		 * Convert the exit_code to SVM_EXIT_CR0_SEL_WRITE if a
		 * selective CR0 intercept is triggered (the common logic will
		 * treat the selective intercept as being enabled).  Note, the
		 * unconditional intercept has higher priority, i.e. this is
		 * only relevant if *only* the selective intercept is enabled.
		 */
		if (vmcb12_is_intercept(&svm->nested.ctl, INTERCEPT_CR0_WRITE) ||
		    !(vmcb12_is_intercept(&svm->nested.ctl, INTERCEPT_SELECTIVE_CR0)))
			break;

		/* CLTS never triggers INTERCEPT_SELECTIVE_CR0 */
		if (info->intercept == x86_intercept_clts)
			break;

		/* LMSW always triggers INTERCEPT_SELECTIVE_CR0 */
		if (info->intercept == x86_intercept_lmsw) {
			icpt_info.exit_code = SVM_EXIT_CR0_SEL_WRITE;
			break;
		}

		/*
		 * MOV-to-CR0 only triggers INTERCEPT_SELECTIVE_CR0 if any bit
		 * other than SVM_CR0_SELECTIVE_MASK is changed.
		 */
		cr0 = vcpu->arch.cr0 & ~SVM_CR0_SELECTIVE_MASK;
		val = info->src_val  & ~SVM_CR0_SELECTIVE_MASK;
		if (cr0 ^ val)
			icpt_info.exit_code = SVM_EXIT_CR0_SEL_WRITE;
		break;
	}
	case SVM_EXIT_READ_DR0:
	case SVM_EXIT_WRITE_DR0:
		icpt_info.exit_code += info->modrm_reg;
		break;
	case SVM_EXIT_MSR:
		if (info->intercept == x86_intercept_wrmsr)
			vmcb->control.exit_info_1 = 1;
		else
			vmcb->control.exit_info_1 = 0;
		break;
	case SVM_EXIT_PAUSE:
		/*
		 * We get this for NOP only, but pause
		 * is rep not, check this here
		 */
		if (info->rep_prefix != REPE_PREFIX)
			goto out;
		break;
	case SVM_EXIT_IOIO: {
		u64 exit_info;
		u32 bytes;

		if (info->intercept == x86_intercept_in ||
		    info->intercept == x86_intercept_ins) {
			exit_info = ((info->src_val & 0xffff) << 16) |
				SVM_IOIO_TYPE_MASK;
			bytes = info->dst_bytes;
		} else {
			exit_info = (info->dst_val & 0xffff) << 16;
			bytes = info->src_bytes;
		}

		if (info->intercept == x86_intercept_outs ||
		    info->intercept == x86_intercept_ins)
			exit_info |= SVM_IOIO_STR_MASK;

		if (info->rep_prefix)
			exit_info |= SVM_IOIO_REP_MASK;

		bytes = min(bytes, 4u);

		exit_info |= bytes << SVM_IOIO_SIZE_SHIFT;

		exit_info |= (u32)info->ad_bytes << (SVM_IOIO_ASIZE_SHIFT - 1);

		vmcb->control.exit_info_1 = exit_info;
		vmcb->control.exit_info_2 = info->next_rip;

		break;
	}
	default:
		break;
	}

	/* TODO: Advertise NRIPS to guest hypervisor unconditionally */
	if (cpu_feature_enabled(X86_FEATURE_NRIPS))
		vmcb->control.next_rip  = info->next_rip;
	vmcb->control.exit_code = icpt_info.exit_code;
	vmexit = nested_svm_exit_handled(svm);

	ret = (vmexit == NESTED_EXIT_DONE) ? X86EMUL_INTERCEPTED
					   : X86EMUL_CONTINUE;

out:
	return ret;
}

static void svm_handle_exit_irqoff(struct kvm_vcpu *vcpu)
{
	switch (to_svm(vcpu)->vmcb->control.exit_code) {
	case SVM_EXIT_EXCP_BASE + MC_VECTOR:
		svm_handle_mce(vcpu);
		break;
	case SVM_EXIT_INTR:
		vcpu->arch.at_instruction_boundary = true;
		break;
	default:
		break;
	}
}

static void svm_setup_mce(struct kvm_vcpu *vcpu)
{
	/* [63:9] are reserved. */
	vcpu->arch.mcg_cap &= 0x1ff;
}

#ifdef CONFIG_KVM_SMM
bool svm_smi_blocked(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	/* Per APM Vol.2 15.22.2 "Response to SMI" */
	if (!gif_set(svm))
		return true;

	return is_smm(vcpu);
}

static int svm_smi_allowed(struct kvm_vcpu *vcpu, bool for_injection)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	if (vcpu->arch.nested_run_pending)
		return -EBUSY;

	if (svm_smi_blocked(vcpu))
		return 0;

	/* An SMI must not be injected into L2 if it's supposed to VM-Exit.  */
	if (for_injection && is_guest_mode(vcpu) && nested_exit_on_smi(svm))
		return -EBUSY;

	return 1;
}

static int svm_enter_smm(struct kvm_vcpu *vcpu, union kvm_smram *smram)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	if (!is_guest_mode(vcpu))
		return 0;

	/*
	 * 32-bit SMRAM format doesn't preserve EFER and SVM state.  Userspace is
	 * responsible for ensuring nested SVM and SMIs are mutually exclusive.
	 */

	if (!guest_cpu_cap_has(vcpu, X86_FEATURE_LM))
		return 1;

	smram->smram64.svm_guest_flag = 1;
	smram->smram64.svm_guest_vmcb_gpa = svm->nested.vmcb12_gpa;

	svm->vmcb->save.rax = vcpu->arch.regs[VCPU_REGS_RAX];
	svm->vmcb->save.rsp = vcpu->arch.regs[VCPU_REGS_RSP];
	svm->vmcb->save.rip = vcpu->arch.rip;

	nested_svm_simple_vmexit(svm, SVM_EXIT_SW);

	/*
	 * KVM uses VMCB01 to store L1 host state while L2 runs but
	 * VMCB01 is going to be used during SMM and thus the state will
	 * be lost. Temporary save non-VMLOAD/VMSAVE state to the host save
	 * area pointed to by MSR_VM_HSAVE_PA. APM guarantees that the
	 * format of the area is identical to guest save area offsetted
	 * by 0x400 (matches the offset of 'struct vmcb_save_area'
	 * within 'struct vmcb'). Note: HSAVE area may also be used by
	 * L1 hypervisor to save additional host context (e.g. KVM does
	 * that, see svm_prepare_switch_to_guest()) which must be
	 * preserved.
	 */
	CLASS(kvm_vcpu_map_local, m_save)(vcpu, gpa_to_gfn(svm->nested.hsave_msr));
	if (m_save.ret)
		return 1;

	BUILD_BUG_ON(offsetof(struct vmcb, save) != 0x400);

	svm_copy_vmrun_state(m_save.map.hva + 0x400, &svm->vmcb01.ptr->save);
	return 0;
}

static int svm_leave_smm(struct kvm_vcpu *vcpu, const union kvm_smram *smram)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb *vmcb12;

	const struct kvm_smram_state_64 *smram64 = &smram->smram64;

	if (!guest_cpu_cap_has(vcpu, X86_FEATURE_LM))
		return 0;

	/* Non-zero if SMI arrived while vCPU was in guest mode. */
	if (!smram64->svm_guest_flag)
		return 0;

	if (!guest_cpu_cap_has(vcpu, X86_FEATURE_SVM))
		return 1;

	if (!(smram64->efer & EFER_SVME))
		return 1;

	CLASS(kvm_vcpu_map_local, m)(vcpu, gpa_to_gfn(smram64->svm_guest_vmcb_gpa));
	if (m.ret)
		return 1;

	CLASS(kvm_vcpu_map_local, m_save)(vcpu, gpa_to_gfn(svm->nested.hsave_msr));
	if (m_save.ret)
		return 1;

	if (svm_allocate_nested(svm))
		return 1;

	/*
	 * Restore L1 host state from L1 HSAVE area as VMCB01 was
	 * used during SMM (see svm_enter_smm())
	 */

	svm_copy_vmrun_state(&svm->vmcb01.ptr->save, m_save.map.hva + 0x400);

	/*
	 * Enter the nested guest now
	 */

	vmcb_mark_all_dirty(svm->vmcb01.ptr);

	vmcb12 = m.map.hva;
	nested_copy_vmcb_control_to_cache(svm, &vmcb12->control);
	nested_copy_vmcb_save_to_cache(svm, &vmcb12->save);

	if (nested_svm_check_cached_vmcb12(vcpu) < 0)
		return 1;

	if (enter_svm_guest_mode(vcpu, smram64->svm_guest_vmcb_gpa, false) != 0)
		return 1;

	vcpu->arch.nested_run_pending = KVM_NESTED_RUN_PENDING;
	return 0;
}

static void svm_enable_smi_window(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	if (!gif_set(svm)) {
		if (vgif)
			svm_set_intercept(svm, INTERCEPT_STGI);
		/* STGI will cause a vm exit */
	} else {
		/* We must be in SMM; RSM will cause a vmexit anyway.  */
	}
}
#endif

static int svm_check_emulate_instruction(struct kvm_vcpu *vcpu, int emul_type,
					 void *insn, int insn_len)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	bool smep, smap, is_user;
	u64 error_code;

	/* Check that emulation is possible during event vectoring */
	if ((svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_TYPE_MASK) &&
	    !kvm_can_emulate_event_vectoring(emul_type))
		return X86EMUL_UNHANDLEABLE_VECTORING;

	/* Emulation is always possible when KVM has access to all guest state. */
	if (!is_sev_guest(vcpu))
		return X86EMUL_CONTINUE;

	/* #UD and #GP should never be intercepted for SEV guests. */
	WARN_ON_ONCE(emul_type & (EMULTYPE_TRAP_UD |
				  EMULTYPE_TRAP_UD_FORCED |
				  EMULTYPE_VMWARE_GP));

	/*
	 * Emulation is impossible for SEV-ES guests as KVM doesn't have access
	 * to guest register state.
	 */
	if (is_sev_es_guest(vcpu))
		return X86EMUL_RETRY_INSTR;

	/*
	 * Emulation is possible if the instruction is already decoded, e.g.
	 * when completing I/O after returning from userspace.
	 */
	if (emul_type & EMULTYPE_NO_DECODE)
		return X86EMUL_CONTINUE;

	/*
	 * Emulation is possible for SEV guests if and only if a prefilled
	 * buffer containing the bytes of the intercepted instruction is
	 * available. SEV guest memory is encrypted with a guest specific key
	 * and cannot be decrypted by KVM, i.e. KVM would read ciphertext and
	 * decode garbage.
	 *
	 * If KVM is NOT trying to simply skip an instruction, inject #UD if
	 * KVM reached this point without an instruction buffer.  In practice,
	 * this path should never be hit by a well-behaved guest, e.g. KVM
	 * doesn't intercept #UD or #GP for SEV guests, but this path is still
	 * theoretically reachable, e.g. via unaccelerated fault-like AVIC
	 * access, and needs to be handled by KVM to avoid putting the guest
	 * into an infinite loop.   Injecting #UD is somewhat arbitrary, but
	 * its the least awful option given lack of insight into the guest.
	 *
	 * If KVM is trying to skip an instruction, simply resume the guest.
	 * If a #NPF occurs while the guest is vectoring an INT3/INTO, then KVM
	 * will attempt to re-inject the INT3/INTO and skip the instruction.
	 * In that scenario, retrying the INT3/INTO and hoping the guest will
	 * make forward progress is the only option that has a chance of
	 * success (and in practice it will work the vast majority of the time).
	 */
	if (unlikely(!insn)) {
		if (emul_type & EMULTYPE_SKIP)
			return X86EMUL_UNHANDLEABLE;

		kvm_queue_exception(vcpu, UD_VECTOR);
		return X86EMUL_PROPAGATE_FAULT;
	}

	/*
	 * Emulate for SEV guests if the insn buffer is not empty.  The buffer
	 * will be empty if the DecodeAssist microcode cannot fetch bytes for
	 * the faulting instruction because the code fetch itself faulted, e.g.
	 * the guest attempted to fetch from emulated MMIO or a guest page
	 * table used to translate CS:RIP resides in emulated MMIO.
	 */
	if (likely(insn_len))
		return X86EMUL_CONTINUE;

	/*
	 * Detect and workaround Errata 1096 Fam_17h_00_0Fh.
	 *
	 * Errata:
	 * When CPU raises #NPF on guest data access and vCPU CR4.SMAP=1, it is
	 * possible that CPU microcode implementing DecodeAssist will fail to
	 * read guest memory at CS:RIP and vmcb.GuestIntrBytes will incorrectly
	 * be '0'.  This happens because microcode reads CS:RIP using a _data_
	 * loap uop with CPL=0 privileges.  If the load hits a SMAP #PF, ucode
	 * gives up and does not fill the instruction bytes buffer.
	 *
	 * As above, KVM reaches this point iff the VM is an SEV guest, the CPU
	 * supports DecodeAssist, a #NPF was raised, KVM's page fault handler
	 * triggered emulation (e.g. for MMIO), and the CPU returned 0 in the
	 * GuestIntrBytes field of the VMCB.
	 *
	 * This does _not_ mean that the erratum has been encountered, as the
	 * DecodeAssist will also fail if the load for CS:RIP hits a legitimate
	 * #PF, e.g. if the guest attempt to execute from emulated MMIO and
	 * encountered a reserved/not-present #PF.
	 *
	 * To hit the erratum, the following conditions must be true:
	 *    1. CR4.SMAP=1 (obviously).
	 *    2. CR4.SMEP=0 || CPL=3.  If SMEP=1 and CPL<3, the erratum cannot
	 *       have been hit as the guest would have encountered a SMEP
	 *       violation #PF, not a #NPF.
	 *    3. The #NPF is not due to a code fetch, in which case failure to
	 *       retrieve the instruction bytes is legitimate (see abvoe).
	 *
	 * In addition, don't apply the erratum workaround if the #NPF occurred
	 * while translating guest page tables (see below).
	 */
	error_code = svm->vmcb->control.exit_info_1;
	if (error_code & (PFERR_GUEST_PAGE_MASK | PFERR_FETCH_MASK))
		goto resume_guest;

	smep = kvm_is_cr4_bit_set(vcpu, X86_CR4_SMEP);
	smap = kvm_is_cr4_bit_set(vcpu, X86_CR4_SMAP);
	is_user = svm_get_cpl(vcpu) == 3;
	if (smap && (!smep || is_user)) {
		pr_err_ratelimited("SEV Guest triggered AMD Erratum 1096\n");

		/*
		 * If the fault occurred in userspace, arbitrarily inject #GP
		 * to avoid killing the guest and to hopefully avoid confusing
		 * the guest kernel too much, e.g. injecting #PF would not be
		 * coherent with respect to the guest's page tables.  Request
		 * triple fault if the fault occurred in the kernel as there's
		 * no fault that KVM can inject without confusing the guest.
		 * In practice, the triple fault is moot as no sane SEV kernel
		 * will execute from user memory while also running with SMAP=1.
		 */
		if (is_user)
			kvm_inject_gp(vcpu, 0);
		else
			kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
		return X86EMUL_PROPAGATE_FAULT;
	}

resume_guest:
	/*
	 * If the erratum was not hit, simply resume the guest and let it fault
	 * again.  While awful, e.g. the vCPU may get stuck in an infinite loop
	 * if the fault is at CPL=0, it's the lesser of all evils.  Exiting to
	 * userspace will kill the guest, and letting the emulator read garbage
	 * will yield random behavior and potentially corrupt the guest.
	 *
	 * Simply resuming the guest is technically not a violation of the SEV
	 * architecture.  AMD's APM states that all code fetches and page table
	 * accesses for SEV guest are encrypted, regardless of the C-Bit.  The
	 * APM also states that encrypted accesses to MMIO are "ignored", but
	 * doesn't explicitly define "ignored", i.e. doing nothing and letting
	 * the guest spin is technically "ignoring" the access.
	 */
	return X86EMUL_RETRY_INSTR;
}

static bool svm_apic_init_signal_blocked(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	return !gif_set(svm);
}

static void svm_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector)
{
	if (!is_sev_es_guest(vcpu))
		return kvm_vcpu_deliver_sipi_vector(vcpu, vector);

	sev_vcpu_deliver_sipi_vector(vcpu, vector);
}

static void svm_vm_destroy(struct kvm *kvm)
{
	avic_vm_destroy(kvm);
	sev_vm_destroy(kvm);

	svm_srso_vm_destroy();
}

static int svm_vm_init(struct kvm *kvm)
{
	sev_vm_init(kvm);

	if (!pause_filter_count || !pause_filter_thresh)
		kvm_disable_exits(kvm, KVM_X86_DISABLE_EXITS_PAUSE);

	svm_srso_vm_init();
	return 0;
}

static void *svm_alloc_apic_backing_page(struct kvm_vcpu *vcpu)
{
	struct page *page = snp_safe_alloc_page();

	if (!page)
		return NULL;

	return page_address(page);
}

struct kvm_x86_ops svm_x86_ops __initdata = {
	.name = KBUILD_MODNAME,

	.check_processor_compatibility = svm_check_processor_compat,

	.hardware_unsetup = svm_hardware_unsetup,
	.enable_virtualization_cpu = svm_enable_virtualization_cpu,
	.disable_virtualization_cpu = svm_disable_virtualization_cpu,
	.emergency_disable_virtualization_cpu = svm_emergency_disable_virtualization_cpu,
	.has_emulated_msr = svm_has_emulated_msr,

	.vcpu_precreate = avic_vcpu_precreate,
	.vcpu_create = svm_vcpu_create,
	.vcpu_free = svm_vcpu_free,
	.vcpu_reset = svm_vcpu_reset,

	.vm_size = sizeof(struct kvm_svm),
	.vm_init = svm_vm_init,
	.vm_pre_destroy = avic_vm_pre_destroy,
	.vm_destroy = svm_vm_destroy,

	.prepare_switch_to_guest = svm_prepare_switch_to_guest,
	.vcpu_load = svm_vcpu_load,
	.vcpu_put = svm_vcpu_put,
	.vcpu_blocking = avic_vcpu_blocking,
	.vcpu_unblocking = avic_vcpu_unblocking,

	.update_exception_bitmap = svm_update_exception_bitmap,
	.get_feature_msr = svm_get_feature_msr,
	.get_msr = svm_get_msr,
	.set_msr = svm_set_msr,
	.get_segment_base = svm_get_segment_base,
	.get_segment = svm_get_segment,
	.set_segment = svm_set_segment,
	.get_cpl = svm_get_cpl,
	.get_cpl_no_cache = svm_get_cpl,
	.get_cs_db_l_bits = svm_get_cs_db_l_bits,
	.is_valid_cr0 = svm_is_valid_cr0,
	.set_cr0 = svm_set_cr0,
	.post_set_cr3 = sev_post_set_cr3,
	.is_valid_cr4 = svm_is_valid_cr4,
	.set_cr4 = svm_set_cr4,
	.set_efer = svm_set_efer,
	.get_idt = svm_get_idt,
	.set_idt = svm_set_idt,
	.get_gdt = svm_get_gdt,
	.set_gdt = svm_set_gdt,
	.set_dr7 = svm_set_dr7,
	.sync_dirty_debug_regs = svm_sync_dirty_debug_regs,
	.cache_reg = svm_cache_reg,
	.get_rflags = svm_get_rflags,
	.set_rflags = svm_set_rflags,
	.get_if_flag = svm_get_if_flag,

	.flush_tlb_all = svm_flush_tlb_all,
	.flush_tlb_current = svm_flush_tlb_current,
	.flush_tlb_gva = svm_flush_tlb_gva,
	.flush_tlb_guest = svm_flush_tlb_guest,

	.vcpu_run = svm_vcpu_run,
	.handle_exit = svm_handle_exit,
	.skip_emulated_instruction = svm_skip_emulated_instruction,
	.update_emulated_instruction = NULL,
	.set_interrupt_shadow = svm_set_interrupt_shadow,
	.get_interrupt_shadow = svm_get_interrupt_shadow,
	.patch_hypercall = svm_patch_hypercall,
	.inject_irq = svm_inject_irq,
	.inject_nmi = svm_inject_nmi,
	.is_vnmi_pending = svm_is_vnmi_pending,
	.set_vnmi_pending = svm_set_vnmi_pending,
	.inject_exception = svm_inject_exception,
	.cancel_injection = svm_cancel_injection,
	.interrupt_allowed = svm_interrupt_allowed,
	.nmi_allowed = svm_nmi_allowed,
	.get_nmi_mask = svm_get_nmi_mask,
	.set_nmi_mask = svm_set_nmi_mask,
	.enable_nmi_window = svm_enable_nmi_window,
	.enable_irq_window = svm_enable_irq_window,
	.update_cr8_intercept = svm_update_cr8_intercept,

	.x2apic_icr_is_split = true,
	.set_virtual_apic_mode = avic_refresh_virtual_apic_mode,
	.refresh_apicv_exec_ctrl = avic_refresh_apicv_exec_ctrl,
	.apicv_post_state_restore = avic_apicv_post_state_restore,
	.required_apicv_inhibits = AVIC_REQUIRED_APICV_INHIBITS,

	.get_exit_info = svm_get_exit_info,
	.get_entry_info = svm_get_entry_info,

	.vcpu_after_set_cpuid = svm_vcpu_after_set_cpuid,

	.has_wbinvd_exit = svm_has_wbinvd_exit,

	.get_l2_tsc_offset = svm_get_l2_tsc_offset,
	.get_l2_tsc_multiplier = svm_get_l2_tsc_multiplier,
	.write_tsc_offset = svm_write_tsc_offset,
	.write_tsc_multiplier = svm_write_tsc_multiplier,

	.load_mmu_pgd = svm_load_mmu_pgd,
	.tdp_has_smep = svm_tdp_has_smep,

	.check_intercept = svm_check_intercept,
	.handle_exit_irqoff = svm_handle_exit_irqoff,

	.deliver_interrupt = svm_deliver_interrupt,
	.pi_update_irte = avic_pi_update_irte,
	.setup_mce = svm_setup_mce,

#ifdef CONFIG_KVM_SMM
	.smi_allowed = svm_smi_allowed,
	.enter_smm = svm_enter_smm,
	.leave_smm = svm_leave_smm,
	.enable_smi_window = svm_enable_smi_window,
#endif

#ifdef CONFIG_KVM_AMD_SEV
	.vcpu_needs_initialization = sev_vcpu_needs_initialization,
	.dev_get_attr = sev_dev_get_attr,
	.mem_enc_ioctl = sev_mem_enc_ioctl,
	.mem_enc_register_region = sev_mem_enc_register_region,
	.mem_enc_unregister_region = sev_mem_enc_unregister_region,
	.guest_memory_reclaimed = sev_guest_memory_reclaimed,
	.reload_vmsa = sev_snp_reload_vmsa,

	.vm_copy_enc_context_from = sev_vm_copy_enc_context_from,
	.vm_move_enc_context_from = sev_vm_move_enc_context_from,

	.gmem_make_private = sev_gmem_make_private,
	.gmem_make_shared = sev_gmem_make_shared,
	.gmem_invalidate_range = sev_gmem_invalidate_range,
	.gmem_max_mapping_level = sev_gmem_max_mapping_level,
#endif
	.check_emulate_instruction = svm_check_emulate_instruction,

	.apic_init_signal_blocked = svm_apic_init_signal_blocked,

	.recalc_intercepts = svm_recalc_intercepts,
	.complete_emulated_msr = svm_complete_emulated_msr,

	.vcpu_deliver_sipi_vector = svm_vcpu_deliver_sipi_vector,
	.vcpu_get_apicv_inhibit_reasons = avic_vcpu_get_apicv_inhibit_reasons,
	.alloc_apic_backing_page = svm_alloc_apic_backing_page,
};

/*
 * The default MMIO mask is a single bit (excluding the present bit),
 * which could conflict with the memory encryption bit. Check for
 * memory encryption support and override the default MMIO mask if
 * memory encryption is enabled.
 */
static __init void svm_adjust_mmio_mask(void)
{
	unsigned int enc_bit, mask_bit;
	u64 msr, mask;

	/* If there is no memory encryption support, use existing mask */
	if (cpuid_eax(0x80000000) < 0x8000001f)
		return;

	/* If memory encryption is not enabled, use existing mask */
	rdmsrq(MSR_AMD64_SYSCFG, msr);
	if (!(msr & MSR_AMD64_SYSCFG_MEM_ENCRYPT))
		return;

	enc_bit = cpuid_ebx(0x8000001f) & 0x3f;
	mask_bit = boot_cpu_data.x86_phys_bits;

	/* Increment the mask bit if it is the same as the encryption bit */
	if (enc_bit == mask_bit)
		mask_bit++;

	/*
	 * If the mask bit location is below 52, then some bits above the
	 * physical addressing limit will always be reserved, so use the
	 * rsvd_bits() function to generate the mask. This mask, along with
	 * the present bit, will be used to generate a page fault with
	 * PFER.RSV = 1.
	 *
	 * If the mask bit location is 52 (or above), then clear the mask.
	 */
	mask = (mask_bit < 52) ? rsvd_bits(mask_bit, 51) | PT_PRESENT_MASK : 0;

	kvm_mmu_set_mmio_spte_mask(mask, mask, PT_WRITABLE_MASK | PT_USER_MASK);
}

static __init void svm_set_cpu_caps(void)
{
	kvm_initialize_cpu_caps();

	kvm_caps.supported_perf_cap = 0;

	kvm_cpu_cap_clear(X86_FEATURE_IBT);

	/* CPUID 0x80000001 and 0x8000000A (SVM features) */
	if (nested) {
		kvm_cpu_cap_set(X86_FEATURE_SVM);
		kvm_cpu_cap_set(X86_FEATURE_VMCBCLEAN);

		/*
		 * KVM currently flushes TLBs on *every* nested SVM transition,
		 * and so for all intents and purposes KVM supports flushing by
		 * ASID, i.e. KVM is guaranteed to honor every L1 ASID flush.
		 */
		kvm_cpu_cap_set(X86_FEATURE_FLUSHBYASID);

		if (nrips)
			kvm_cpu_cap_set(X86_FEATURE_NRIPS);

		if (npt_enabled)
			kvm_cpu_cap_set(X86_FEATURE_NPT);

		if (tsc_scaling)
			kvm_cpu_cap_set(X86_FEATURE_TSCRATEMSR);

		if (vls)
			kvm_cpu_cap_set(X86_FEATURE_V_VMSAVE_VMLOAD);
		if (lbrv)
			kvm_cpu_cap_set(X86_FEATURE_LBRV);

		if (boot_cpu_has(X86_FEATURE_PAUSEFILTER))
			kvm_cpu_cap_set(X86_FEATURE_PAUSEFILTER);

		if (boot_cpu_has(X86_FEATURE_PFTHRESHOLD))
			kvm_cpu_cap_set(X86_FEATURE_PFTHRESHOLD);

		if (gmet_enabled)
			kvm_cpu_cap_set(X86_FEATURE_GMET);

		if (vgif)
			kvm_cpu_cap_set(X86_FEATURE_VGIF);

		if (vnmi)
			kvm_cpu_cap_set(X86_FEATURE_VNMI);

		/* Nested VM can receive #VMEXIT instead of triggering #GP */
		kvm_cpu_cap_set(X86_FEATURE_SVME_ADDR_CHK);
	}

	if (cpu_feature_enabled(X86_FEATURE_BUS_LOCK_THRESHOLD))
		kvm_caps.has_bus_lock_exit = true;

	/* CPUID 0x80000008 */
	if (boot_cpu_has(X86_FEATURE_LS_CFG_SSBD) ||
	    boot_cpu_has(X86_FEATURE_AMD_SSBD))
		kvm_cpu_cap_set(X86_FEATURE_VIRT_SSBD);

	if (enable_pmu) {
		/*
		 * Enumerate support for PERFCTR_CORE if and only if KVM has
		 * access to enough counters to virtualize "core" support,
		 * otherwise limit vPMU support to the legacy number of counters.
		 */
		if (kvm_pmu_cap.num_counters_gp < AMD64_NUM_COUNTERS_CORE)
			kvm_pmu_cap.num_counters_gp = min(AMD64_NUM_COUNTERS,
							  kvm_pmu_cap.num_counters_gp);
		else
			kvm_cpu_cap_check_and_set(X86_FEATURE_PERFCTR_CORE);

		if (kvm_pmu_cap.version != 2 ||
		    !kvm_cpu_cap_has(X86_FEATURE_PERFCTR_CORE))
			kvm_cpu_cap_clear(X86_FEATURE_PERFMON_V2);
	}

	/* CPUID 0x8000001F (SME/SEV features) */
	sev_set_cpu_caps();

	/*
	 * Clear capabilities that are automatically configured by common code,
	 * but that require explicit SVM support (that isn't yet implemented).
	 */
	kvm_cpu_cap_clear(X86_FEATURE_BUS_LOCK_DETECT);
	kvm_cpu_cap_clear(X86_FEATURE_MSR_IMM);

	kvm_setup_xss_caps();
	kvm_finalize_cpu_caps();
}

static __init int svm_hardware_setup(void)
{
	void *iopm_va;
	int cpu, r;

	/*
	 * NX is required for shadow paging and for NPT if the NX huge pages
	 * mitigation is enabled.
	 */
	if (!boot_cpu_has(X86_FEATURE_NX)) {
		pr_err_ratelimited("NX (Execute Disable) not supported\n");
		return -EOPNOTSUPP;
	}

	kvm_caps.supported_xcr0 &= ~(XFEATURE_MASK_BNDREGS |
				     XFEATURE_MASK_BNDCSR);

	if (tsc_scaling) {
		if (!boot_cpu_has(X86_FEATURE_TSCRATEMSR)) {
			tsc_scaling = false;
		} else {
			pr_info("TSC scaling supported\n");
			kvm_caps.has_tsc_control = true;
		}
	}
	kvm_caps.max_tsc_scaling_ratio = SVM_TSC_RATIO_MAX;
	kvm_caps.tsc_scaling_ratio_frac_bits = 32;

	tsc_aux_uret_slot = kvm_add_user_return_msr(MSR_TSC_AUX);

	/* Check for pause filtering support */
	if (!boot_cpu_has(X86_FEATURE_PAUSEFILTER)) {
		pause_filter_count = 0;
		pause_filter_thresh = 0;
	} else if (!boot_cpu_has(X86_FEATURE_PFTHRESHOLD)) {
		pause_filter_thresh = 0;
	}

	if (nested) {
		pr_info("Nested Virtualization enabled\n");
		r = nested_svm_init_msrpm_merge_offsets();
		if (r)
			return r;
	}
	svm_nested_ops.enabled = nested;

	/*
	 * KVM's MMU doesn't support using 2-level paging for itself, and thus
	 * NPT isn't supported if the host is using 2-level paging since host
	 * CR4 is unchanged on VMRUN.
	 */
	if (!IS_ENABLED(CONFIG_X86_64) && !IS_ENABLED(CONFIG_X86_PAE))
		npt_enabled = false;

	if (!boot_cpu_has(X86_FEATURE_NPT))
		npt_enabled = false;

	if (!npt_enabled || !boot_cpu_has(X86_FEATURE_GMET))
		gmet_enabled = false;

	/* Force VM NPT level equal to the host's paging level */
	kvm_configure_mmu(npt_enabled, get_npt_level(),
			  get_npt_level(), PG_LEVEL_1G);
	pr_info("Nested Paging %s\n", str_enabled_disabled(npt_enabled));

	/*
	 * It seems that on AMD processors PTE's accessed bit is
	 * being set by the CPU hardware before the NPF vmexit.
	 * This is not expected behaviour and our tests fail because
	 * of it.
	 * A workaround here is to disable support for
	 * GUEST_MAXPHYADDR < HOST_MAXPHYADDR if NPT is enabled.
	 * In this case userspace can know if there is support using
	 * KVM_CAP_SMALLER_MAXPHYADDR extension and decide how to handle
	 * it
	 * If future AMD CPU models change the behaviour described above,
	 * this variable can be changed accordingly
	 */
	allow_smaller_maxphyaddr = !npt_enabled;

	/* Setup shadow_me_value and shadow_me_mask */
	kvm_mmu_set_me_spte_mask(sme_me_mask, sme_me_mask);

	svm_adjust_mmio_mask();

	nrips = nrips && boot_cpu_has(X86_FEATURE_NRIPS);

	if (lbrv) {
		if (!boot_cpu_has(X86_FEATURE_LBRV))
			lbrv = false;
		else
			pr_info("LBR virtualization supported\n");
	}

	iopm_va = svm_alloc_permissions_map(IOPM_SIZE, GFP_KERNEL);
	if (!iopm_va)
		return -ENOMEM;

	iopm_base = __sme_set(__pa(iopm_va));

	/*
	 * Note, SEV setup consumes npt_enabled and enable_mmio_caching (which
	 * may be modified by svm_adjust_mmio_mask()), as well as nrips.
	 */
	sev_hardware_setup();

	svm_hv_hardware_setup();

	enable_apicv = avic_hardware_setup();
	if (!enable_apicv) {
		enable_ipiv = false;
		svm_x86_ops.vcpu_precreate = NULL;
		svm_x86_ops.vm_pre_destroy = NULL;
		svm_x86_ops.vcpu_blocking = NULL;
		svm_x86_ops.vcpu_unblocking = NULL;
		svm_x86_ops.vcpu_get_apicv_inhibit_reasons = NULL;
	}

	if (vls) {
		if (!npt_enabled ||
		    !boot_cpu_has(X86_FEATURE_V_VMSAVE_VMLOAD) ||
		    !IS_ENABLED(CONFIG_X86_64)) {
			vls = false;
		} else {
			pr_info("Virtual VMLOAD VMSAVE supported\n");
		}
	}

	if (boot_cpu_has(X86_FEATURE_SVME_ADDR_CHK))
		svm_gp_erratum_intercept = false;

	if (vgif) {
		if (!boot_cpu_has(X86_FEATURE_VGIF))
			vgif = false;
		else
			pr_info("Virtual GIF supported\n");
	}

	vnmi = vgif && vnmi && boot_cpu_has(X86_FEATURE_VNMI);
	if (vnmi)
		pr_info("Virtual NMI enabled\n");

	if (!vnmi) {
		svm_x86_ops.is_vnmi_pending = NULL;
		svm_x86_ops.set_vnmi_pending = NULL;
	}

	if (!enable_pmu)
		pr_info("PMU virtualization is disabled\n");

	svm_set_cpu_caps();

	kvm_caps.inapplicable_quirks &= ~KVM_X86_QUIRK_CD_NW_CLEARED;

	for_each_possible_cpu(cpu) {
		r = svm_cpu_init(cpu);
		if (r)
			goto err;
	}

	return 0;

err:
	svm_hardware_unsetup();
	return r;
}


static struct kvm_x86_init_ops svm_init_ops __initdata = {
	.hardware_setup = svm_hardware_setup,

	.runtime_ops = &svm_x86_ops,
	.pmu_ops = &amd_pmu_ops,
	.nested_ops = &svm_nested_ops,
};

static void __svm_exit(void)
{
	kvm_x86_vendor_exit();
}

static int __init svm_init(void)
{
	int r;

	KVM_SANITY_CHECK_VM_STRUCT_SIZE(kvm_svm);

	__unused_size_checks();

	if (!kvm_is_svm_supported())
		return -EOPNOTSUPP;

	r = kvm_x86_vendor_init(&svm_init_ops);
	if (r)
		return r;

	/*
	 * Common KVM initialization _must_ come last, after this, /dev/kvm is
	 * exposed to userspace!
	 */
	r = kvm_init(sizeof(struct vcpu_svm), __alignof__(struct vcpu_svm),
		     THIS_MODULE);
	if (r)
		goto err_kvm_init;

	return 0;

err_kvm_init:
	__svm_exit();
	return r;
}

static void __exit svm_exit(void)
{
	kvm_exit();
	__svm_exit();
}

module_init(svm_init)
module_exit(svm_exit)