loongarch/kvm/vcpu.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
 */

#include <linux/kvm_host.h>
#include <asm/fpu.h>
#include <asm/lbt.h>
#include <asm/loongarch.h>
#include <asm/setup.h>
#include <asm/time.h>

#define CREATE_TRACE_POINTS
#include "trace.h"

const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
	KVM_GENERIC_VCPU_STATS(),
	STATS_DESC_COUNTER(VCPU, int_exits),
	STATS_DESC_COUNTER(VCPU, idle_exits),
	STATS_DESC_COUNTER(VCPU, cpucfg_exits),
	STATS_DESC_COUNTER(VCPU, signal_exits),
	STATS_DESC_COUNTER(VCPU, hypercall_exits),
	STATS_DESC_COUNTER(VCPU, ipi_read_exits),
	STATS_DESC_COUNTER(VCPU, ipi_write_exits),
	STATS_DESC_COUNTER(VCPU, eiointc_read_exits),
	STATS_DESC_COUNTER(VCPU, eiointc_write_exits),
	STATS_DESC_COUNTER(VCPU, pch_pic_read_exits),
	STATS_DESC_COUNTER(VCPU, pch_pic_write_exits)
};

const struct kvm_stats_header kvm_vcpu_stats_header = {
	.name_size = KVM_STATS_NAME_SIZE,
	.num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc),
	.id_offset = sizeof(struct kvm_stats_header),
	.desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
	.data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
		       sizeof(kvm_vcpu_stats_desc),
};

static inline void kvm_save_host_pmu(struct kvm_vcpu *vcpu)
{
	struct kvm_context *context;

	context = this_cpu_ptr(vcpu->kvm->arch.vmcs);
	context->perf_cntr[0] = read_csr_perfcntr0();
	context->perf_cntr[1] = read_csr_perfcntr1();
	context->perf_cntr[2] = read_csr_perfcntr2();
	context->perf_cntr[3] = read_csr_perfcntr3();
	context->perf_ctrl[0] = write_csr_perfctrl0(0);
	context->perf_ctrl[1] = write_csr_perfctrl1(0);
	context->perf_ctrl[2] = write_csr_perfctrl2(0);
	context->perf_ctrl[3] = write_csr_perfctrl3(0);
}

static inline void kvm_restore_host_pmu(struct kvm_vcpu *vcpu)
{
	struct kvm_context *context;

	context = this_cpu_ptr(vcpu->kvm->arch.vmcs);
	write_csr_perfcntr0(context->perf_cntr[0]);
	write_csr_perfcntr1(context->perf_cntr[1]);
	write_csr_perfcntr2(context->perf_cntr[2]);
	write_csr_perfcntr3(context->perf_cntr[3]);
	write_csr_perfctrl0(context->perf_ctrl[0]);
	write_csr_perfctrl1(context->perf_ctrl[1]);
	write_csr_perfctrl2(context->perf_ctrl[2]);
	write_csr_perfctrl3(context->perf_ctrl[3]);
}


static inline void kvm_save_guest_pmu(struct kvm_vcpu *vcpu)
{
	struct loongarch_csrs *csr = vcpu->arch.csr;

	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PERFCNTR0);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PERFCNTR1);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PERFCNTR2);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PERFCNTR3);
	kvm_read_clear_hw_gcsr(csr, LOONGARCH_CSR_PERFCTRL0);
	kvm_read_clear_hw_gcsr(csr, LOONGARCH_CSR_PERFCTRL1);
	kvm_read_clear_hw_gcsr(csr, LOONGARCH_CSR_PERFCTRL2);
	kvm_read_clear_hw_gcsr(csr, LOONGARCH_CSR_PERFCTRL3);
}

static inline void kvm_restore_guest_pmu(struct kvm_vcpu *vcpu)
{
	struct loongarch_csrs *csr = vcpu->arch.csr;

	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PERFCNTR0);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PERFCNTR1);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PERFCNTR2);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PERFCNTR3);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PERFCTRL0);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PERFCTRL1);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PERFCTRL2);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PERFCTRL3);
}

static int kvm_own_pmu(struct kvm_vcpu *vcpu)
{
	unsigned long val;

	if (!kvm_guest_has_pmu(&vcpu->arch))
		return -EINVAL;

	kvm_save_host_pmu(vcpu);

	/* Set PM0-PM(num) to guest */
	val = read_csr_gcfg() & ~CSR_GCFG_GPERF;
	val |= (kvm_get_pmu_num(&vcpu->arch) + 1) << CSR_GCFG_GPERF_SHIFT;
	write_csr_gcfg(val);

	kvm_restore_guest_pmu(vcpu);

	return 0;
}

static void kvm_lose_pmu(struct kvm_vcpu *vcpu)
{
	unsigned long val;
	struct loongarch_csrs *csr = vcpu->arch.csr;

	if (!(vcpu->arch.aux_inuse & KVM_LARCH_PMU))
		return;

	kvm_save_guest_pmu(vcpu);

	/* Disable pmu access from guest */
	write_csr_gcfg(read_csr_gcfg() & ~CSR_GCFG_GPERF);

	/*
	 * Clear KVM_LARCH_PMU if the guest is not using PMU CSRs when
	 * exiting the guest, so that the next time trap into the guest.
	 * We don't need to deal with PMU CSRs contexts.
	 *
	 * Otherwise set the request bit KVM_REQ_PMU to restore guest PMU
	 * before entering guest VM
	 */
	val = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_PERFCTRL0);
	val |= kvm_read_sw_gcsr(csr, LOONGARCH_CSR_PERFCTRL1);
	val |= kvm_read_sw_gcsr(csr, LOONGARCH_CSR_PERFCTRL2);
	val |= kvm_read_sw_gcsr(csr, LOONGARCH_CSR_PERFCTRL3);
	if (!(val & KVM_PMU_EVENT_ENABLED))
		vcpu->arch.aux_inuse &= ~KVM_LARCH_PMU;
	else
		kvm_make_request(KVM_REQ_PMU, vcpu);

	kvm_restore_host_pmu(vcpu);
}

static void kvm_check_pmu(struct kvm_vcpu *vcpu)
{
	if (kvm_check_request(KVM_REQ_PMU, vcpu)) {
		kvm_own_pmu(vcpu);
		vcpu->arch.aux_inuse |= KVM_LARCH_PMU;
	}
}

static void kvm_update_stolen_time(struct kvm_vcpu *vcpu)
{
	u32 version;
	u64 steal;
	gpa_t gpa;
	struct kvm_memslots *slots;
	struct kvm_steal_time __user *st;
	struct gfn_to_hva_cache *ghc;

	ghc = &vcpu->arch.st.cache;
	gpa = vcpu->arch.st.guest_addr;
	if (!(gpa & KVM_STEAL_PHYS_VALID))
		return;

	gpa &= KVM_STEAL_PHYS_MASK;
	slots = kvm_memslots(vcpu->kvm);
	if (slots->generation != ghc->generation || gpa != ghc->gpa) {
		if (kvm_gfn_to_hva_cache_init(vcpu->kvm, ghc, gpa, sizeof(*st))) {
			ghc->gpa = INVALID_GPA;
			return;
		}
	}

	st = (struct kvm_steal_time __user *)ghc->hva;
	unsafe_get_user(version, &st->version, out);
	if (version & 1)
		version += 1; /* first time write, random junk */

	version += 1;
	unsafe_put_user(version, &st->version, out);
	smp_wmb();

	unsafe_get_user(steal, &st->steal, out);
	steal += current->sched_info.run_delay - vcpu->arch.st.last_steal;
	vcpu->arch.st.last_steal = current->sched_info.run_delay;
	unsafe_put_user(steal, &st->steal, out);

	smp_wmb();
	version += 1;
	unsafe_put_user(version, &st->version, out);
out:
	mark_page_dirty_in_slot(vcpu->kvm, ghc->memslot, gpa_to_gfn(ghc->gpa));
}

/*
 * kvm_check_requests - check and handle pending vCPU requests
 *
 * Return: RESUME_GUEST if we should enter the guest
 *         RESUME_HOST  if we should exit to userspace
 */
static int kvm_check_requests(struct kvm_vcpu *vcpu)
{
	if (!kvm_request_pending(vcpu))
		return RESUME_GUEST;

	if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
		vcpu->arch.vpid = 0;  /* Drop vpid for this vCPU */

	if (kvm_dirty_ring_check_request(vcpu))
		return RESUME_HOST;

	if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu))
		kvm_update_stolen_time(vcpu);

	return RESUME_GUEST;
}

static void kvm_late_check_requests(struct kvm_vcpu *vcpu)
{
	lockdep_assert_irqs_disabled();
	if (kvm_check_request(KVM_REQ_TLB_FLUSH_GPA, vcpu))
		if (vcpu->arch.flush_gpa != INVALID_GPA) {
			kvm_flush_tlb_gpa(vcpu, vcpu->arch.flush_gpa);
			vcpu->arch.flush_gpa = INVALID_GPA;
		}
}

/*
 * Check and handle pending signal and vCPU requests etc
 * Run with irq enabled and preempt enabled
 *
 * Return: RESUME_GUEST if we should enter the guest
 *         RESUME_HOST  if we should exit to userspace
 *         < 0 if we should exit to userspace, where the return value
 *         indicates an error
 */
static int kvm_enter_guest_check(struct kvm_vcpu *vcpu)
{
	int idx, ret;

	/*
	 * Check conditions before entering the guest
	 */
	ret = kvm_xfer_to_guest_mode_handle_work(vcpu);
	if (ret < 0)
		return ret;

	idx = srcu_read_lock(&vcpu->kvm->srcu);
	ret = kvm_check_requests(vcpu);
	srcu_read_unlock(&vcpu->kvm->srcu, idx);

	return ret;
}

/*
 * Called with irq enabled
 *
 * Return: RESUME_GUEST if we should enter the guest, and irq disabled
 *         Others if we should exit to userspace
 */
static int kvm_pre_enter_guest(struct kvm_vcpu *vcpu)
{
	int ret;

	do {
		ret = kvm_enter_guest_check(vcpu);
		if (ret != RESUME_GUEST)
			break;

		/*
		 * Handle vcpu timer, interrupts, check requests and
		 * check vmid before vcpu enter guest
		 */
		local_irq_disable();
		kvm_deliver_intr(vcpu);
		kvm_deliver_exception(vcpu);
		/* Make sure the vcpu mode has been written */
		smp_store_mb(vcpu->mode, IN_GUEST_MODE);
		kvm_check_vpid(vcpu);
		kvm_check_pmu(vcpu);

		/*
		 * Called after function kvm_check_vpid()
		 * Since it updates CSR.GSTAT used by kvm_flush_tlb_gpa(),
		 * and it may also clear KVM_REQ_TLB_FLUSH_GPA pending bit
		 */
		kvm_late_check_requests(vcpu);
		vcpu->arch.host_eentry = csr_read64(LOONGARCH_CSR_EENTRY);
		/* Clear KVM_LARCH_SWCSR_LATEST as CSR will change when enter guest */
		vcpu->arch.aux_inuse &= ~KVM_LARCH_SWCSR_LATEST;

		if (kvm_request_pending(vcpu) || xfer_to_guest_mode_work_pending()) {
			if (vcpu->arch.aux_inuse & KVM_LARCH_PMU) {
				kvm_lose_pmu(vcpu);
				kvm_make_request(KVM_REQ_PMU, vcpu);
			}
			/* make sure the vcpu mode has been written */
			smp_store_mb(vcpu->mode, OUTSIDE_GUEST_MODE);
			local_irq_enable();
			ret = -EAGAIN;
		}
	} while (ret != RESUME_GUEST);

	return ret;
}

/*
 * Return 1 for resume guest and "<= 0" for resume host.
 */
static int kvm_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
	int ret = RESUME_GUEST;
	unsigned long estat = vcpu->arch.host_estat;
	u32 intr = estat & CSR_ESTAT_IS;
	u32 ecode = (estat & CSR_ESTAT_EXC) >> CSR_ESTAT_EXC_SHIFT;

	vcpu->mode = OUTSIDE_GUEST_MODE;

	/* Set a default exit reason */
	run->exit_reason = KVM_EXIT_UNKNOWN;

	kvm_lose_pmu(vcpu);

	guest_timing_exit_irqoff();
	guest_state_exit_irqoff();
	local_irq_enable();

	trace_kvm_exit(vcpu, ecode);
	if (ecode) {
		ret = kvm_handle_fault(vcpu, ecode);
	} else {
		WARN(!intr, "vm exiting with suspicious irq\n");
		++vcpu->stat.int_exits;
	}

	if (ret == RESUME_GUEST)
		ret = kvm_pre_enter_guest(vcpu);

	if (ret != RESUME_GUEST) {
		local_irq_disable();
		return ret;
	}

	guest_timing_enter_irqoff();
	guest_state_enter_irqoff();
	trace_kvm_reenter(vcpu);

	return RESUME_GUEST;
}

int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
	return !!(vcpu->arch.irq_pending) &&
		vcpu->arch.mp_state.mp_state == KVM_MP_STATE_RUNNABLE;
}

int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
{
	return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
}

bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
{
	unsigned long val;

	preempt_disable();
	val = gcsr_read(LOONGARCH_CSR_CRMD);
	preempt_enable();

	return (val & CSR_PRMD_PPLV) == PLV_KERN;
}

#ifdef CONFIG_GUEST_PERF_EVENTS
unsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu)
{
	return vcpu->arch.pc;
}

/*
 * Returns true if a Performance Monitoring Interrupt (PMI), a.k.a. perf event,
 * arrived in guest context.  For LoongArch64, if PMU is not passthrough to VM,
 * any event that arrives while a vCPU is loaded is considered to be "in guest".
 */
bool kvm_arch_pmi_in_guest(struct kvm_vcpu *vcpu)
{
	return (vcpu && !(vcpu->arch.aux_inuse & KVM_LARCH_PMU));
}
#endif

bool kvm_arch_vcpu_preempted_in_kernel(struct kvm_vcpu *vcpu)
{
	return false;
}

vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
{
	return VM_FAULT_SIGBUS;
}

int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
				  struct kvm_translation *tr)
{
	return -EINVAL;
}

int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
	int ret;

	/* Protect from TOD sync and vcpu_load/put() */
	preempt_disable();
	ret = kvm_pending_timer(vcpu) ||
		kvm_read_hw_gcsr(LOONGARCH_CSR_ESTAT) & (1 << INT_TI);
	preempt_enable();

	return ret;
}

int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu)
{
	int i;

	kvm_debug("vCPU Register Dump:\n");
	kvm_debug("\tPC = 0x%08lx\n", vcpu->arch.pc);
	kvm_debug("\tExceptions: %08lx\n", vcpu->arch.irq_pending);

	for (i = 0; i < 32; i += 4) {
		kvm_debug("\tGPR%02d: %08lx %08lx %08lx %08lx\n", i,
		       vcpu->arch.gprs[i], vcpu->arch.gprs[i + 1],
		       vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]);
	}

	kvm_debug("\tCRMD: 0x%08lx, ESTAT: 0x%08lx\n",
		  kvm_read_hw_gcsr(LOONGARCH_CSR_CRMD),
		  kvm_read_hw_gcsr(LOONGARCH_CSR_ESTAT));

	kvm_debug("\tERA: 0x%08lx\n", kvm_read_hw_gcsr(LOONGARCH_CSR_ERA));

	return 0;
}

int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
				struct kvm_mp_state *mp_state)
{
	*mp_state = vcpu->arch.mp_state;

	return 0;
}

int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
				struct kvm_mp_state *mp_state)
{
	int ret = 0;

	switch (mp_state->mp_state) {
	case KVM_MP_STATE_RUNNABLE:
		vcpu->arch.mp_state = *mp_state;
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
					struct kvm_guest_debug *dbg)
{
	if (dbg->control & ~KVM_GUESTDBG_VALID_MASK)
		return -EINVAL;

	if (dbg->control & KVM_GUESTDBG_ENABLE)
		vcpu->guest_debug = dbg->control;
	else
		vcpu->guest_debug = 0;

	return 0;
}

static inline int kvm_set_cpuid(struct kvm_vcpu *vcpu, u64 val)
{
	int cpuid;
	struct kvm_phyid_map *map;
	struct loongarch_csrs *csr = vcpu->arch.csr;

	if (val >= KVM_MAX_PHYID)
		return -EINVAL;

	map = vcpu->kvm->arch.phyid_map;
	cpuid = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_CPUID);

	spin_lock(&vcpu->kvm->arch.phyid_map_lock);
	if ((cpuid < KVM_MAX_PHYID) && map->phys_map[cpuid].enabled) {
		/* Discard duplicated CPUID set operation */
		if (cpuid == val) {
			spin_unlock(&vcpu->kvm->arch.phyid_map_lock);
			return 0;
		}

		/*
		 * CPUID is already set before
		 * Forbid changing to a different CPUID at runtime
		 */
		spin_unlock(&vcpu->kvm->arch.phyid_map_lock);
		return -EINVAL;
	}

	if (map->phys_map[val].enabled) {
		/* Discard duplicated CPUID set operation */
		if (vcpu == map->phys_map[val].vcpu) {
			spin_unlock(&vcpu->kvm->arch.phyid_map_lock);
			return 0;
		}

		/*
		 * New CPUID is already set with other vcpu
		 * Forbid sharing the same CPUID between different vcpus
		 */
		spin_unlock(&vcpu->kvm->arch.phyid_map_lock);
		return -EINVAL;
	}

	kvm_write_sw_gcsr(csr, LOONGARCH_CSR_CPUID, val);
	map->phys_map[val].enabled	= true;
	map->phys_map[val].vcpu		= vcpu;
	spin_unlock(&vcpu->kvm->arch.phyid_map_lock);

	return 0;
}

static inline void kvm_drop_cpuid(struct kvm_vcpu *vcpu)
{
	int cpuid;
	struct kvm_phyid_map *map;
	struct loongarch_csrs *csr = vcpu->arch.csr;

	map = vcpu->kvm->arch.phyid_map;
	cpuid = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_CPUID);

	if (cpuid >= KVM_MAX_PHYID)
		return;

	spin_lock(&vcpu->kvm->arch.phyid_map_lock);
	if (map->phys_map[cpuid].enabled) {
		map->phys_map[cpuid].vcpu = NULL;
		map->phys_map[cpuid].enabled = false;
		kvm_write_sw_gcsr(csr, LOONGARCH_CSR_CPUID, KVM_MAX_PHYID);
	}
	spin_unlock(&vcpu->kvm->arch.phyid_map_lock);
}

struct kvm_vcpu *kvm_get_vcpu_by_cpuid(struct kvm *kvm, int cpuid)
{
	struct kvm_phyid_map *map;

	if (cpuid >= KVM_MAX_PHYID)
		return NULL;

	map = kvm->arch.phyid_map;
	if (!map->phys_map[cpuid].enabled)
		return NULL;

	return map->phys_map[cpuid].vcpu;
}

static int _kvm_getcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 *val)
{
	unsigned long gintc;
	struct loongarch_csrs *csr = vcpu->arch.csr;

	if (get_gcsr_flag(id) & INVALID_GCSR)
		return -EINVAL;

	if (id == LOONGARCH_CSR_ESTAT) {
		preempt_disable();
		vcpu_load(vcpu);
		/*
		 * Sync pending interrupts into ESTAT so that interrupt
		 * remains during VM migration stage
		 */
		kvm_deliver_intr(vcpu);
		vcpu->arch.aux_inuse &= ~KVM_LARCH_SWCSR_LATEST;
		vcpu_put(vcpu);
		preempt_enable();

		/* ESTAT IP0~IP7 get from GINTC */
		gintc = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_GINTC) & 0xff;
		*val = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_ESTAT) | (gintc << 2);
		return 0;
	}

	/*
	 * Get software CSR state since software state is consistent
	 * with hardware for synchronous ioctl
	 */
	*val = kvm_read_sw_gcsr(csr, id);

	return 0;
}

static int _kvm_setcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 val)
{
	int ret = 0, gintc;
	struct loongarch_csrs *csr = vcpu->arch.csr;

	if (get_gcsr_flag(id) & INVALID_GCSR)
		return -EINVAL;

	if (id == LOONGARCH_CSR_CPUID)
		return kvm_set_cpuid(vcpu, val);

	if (id == LOONGARCH_CSR_ESTAT) {
		/* ESTAT IP0~IP7 inject through GINTC */
		gintc = (val >> 2) & 0xff;
		kvm_set_sw_gcsr(csr, LOONGARCH_CSR_GINTC, gintc);

		gintc = val & ~(0xffUL << 2);
		kvm_set_sw_gcsr(csr, LOONGARCH_CSR_ESTAT, gintc);

		return ret;
	}

	kvm_write_sw_gcsr(csr, id, val);

	/*
	 * After modifying the PMU CSR register value of the vcpu.
	 * If the PMU CSRs are used, we need to set KVM_REQ_PMU.
	 */
	if (id >= LOONGARCH_CSR_PERFCTRL0 && id <= LOONGARCH_CSR_PERFCNTR3) {
		unsigned long val;

		val = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_PERFCTRL0) |
		      kvm_read_sw_gcsr(csr, LOONGARCH_CSR_PERFCTRL1) |
		      kvm_read_sw_gcsr(csr, LOONGARCH_CSR_PERFCTRL2) |
		      kvm_read_sw_gcsr(csr, LOONGARCH_CSR_PERFCTRL3);

		if (val & KVM_PMU_EVENT_ENABLED)
			kvm_make_request(KVM_REQ_PMU, vcpu);
	}

	return ret;
}

static int _kvm_get_cpucfg_mask(int id, u64 *v)
{
	if (id < 0 || id >= KVM_MAX_CPUCFG_REGS)
		return -EINVAL;

	switch (id) {
	case LOONGARCH_CPUCFG0:
		*v = GENMASK(31, 0);
		return 0;
	case LOONGARCH_CPUCFG1:
		/* CPUCFG1_MSGINT is not supported by KVM */
		*v = GENMASK(25, 0);
		return 0;
	case LOONGARCH_CPUCFG2:
		/* CPUCFG2 features unconditionally supported by KVM */
		*v = CPUCFG2_FP     | CPUCFG2_FPSP  | CPUCFG2_FPDP     |
		     CPUCFG2_FPVERS | CPUCFG2_LLFTP | CPUCFG2_LLFTPREV |
		     CPUCFG2_LSPW | CPUCFG2_LAM;
		/*
		 * For the ISA extensions listed below, if one is supported
		 * by the host, then it is also supported by KVM.
		 */
		if (cpu_has_lsx)
			*v |= CPUCFG2_LSX;
		if (cpu_has_lasx)
			*v |= CPUCFG2_LASX;
		if (cpu_has_lbt_x86)
			*v |= CPUCFG2_X86BT;
		if (cpu_has_lbt_arm)
			*v |= CPUCFG2_ARMBT;
		if (cpu_has_lbt_mips)
			*v |= CPUCFG2_MIPSBT;
		if (cpu_has_ptw)
			*v |= CPUCFG2_PTW;

		return 0;
	case LOONGARCH_CPUCFG3:
		*v = GENMASK(16, 0);
		return 0;
	case LOONGARCH_CPUCFG4:
	case LOONGARCH_CPUCFG5:
		*v = GENMASK(31, 0);
		return 0;
	case LOONGARCH_CPUCFG6:
		if (cpu_has_pmp)
			*v = GENMASK(14, 0);
		else
			*v = 0;
		return 0;
	case LOONGARCH_CPUCFG16:
		*v = GENMASK(16, 0);
		return 0;
	case LOONGARCH_CPUCFG17 ... LOONGARCH_CPUCFG20:
		*v = GENMASK(30, 0);
		return 0;
	default:
		/*
		 * CPUCFG bits should be zero if reserved by HW or not
		 * supported by KVM.
		 */
		*v = 0;
		return 0;
	}
}

static int kvm_check_cpucfg(int id, u64 val)
{
	int ret;
	u64 mask = 0;

	ret = _kvm_get_cpucfg_mask(id, &mask);
	if (ret)
		return ret;

	if (val & ~mask)
		/* Unsupported features and/or the higher 32 bits should not be set */
		return -EINVAL;

	switch (id) {
	case LOONGARCH_CPUCFG2:
		if (!(val & CPUCFG2_LLFTP))
			/* Guests must have a constant timer */
			return -EINVAL;
		if ((val & CPUCFG2_FP) && (!(val & CPUCFG2_FPSP) || !(val & CPUCFG2_FPDP)))
			/* Single and double float point must both be set when FP is enabled */
			return -EINVAL;
		if ((val & CPUCFG2_LSX) && !(val & CPUCFG2_FP))
			/* LSX architecturally implies FP but val does not satisfy that */
			return -EINVAL;
		if ((val & CPUCFG2_LASX) && !(val & CPUCFG2_LSX))
			/* LASX architecturally implies LSX and FP but val does not satisfy that */
			return -EINVAL;
		return 0;
	case LOONGARCH_CPUCFG6:
		if (val & CPUCFG6_PMP) {
			u32 host = read_cpucfg(LOONGARCH_CPUCFG6);
			if ((val & CPUCFG6_PMBITS) != (host & CPUCFG6_PMBITS))
				return -EINVAL;
			if ((val & CPUCFG6_PMNUM) > (host & CPUCFG6_PMNUM))
				return -EINVAL;
			if ((val & CPUCFG6_UPM) && !(host & CPUCFG6_UPM))
				return -EINVAL;
		}
		return 0;
	default:
		/*
		 * Values for the other CPUCFG IDs are not being further validated
		 * besides the mask check above.
		 */
		return 0;
	}
}

static int kvm_get_one_reg(struct kvm_vcpu *vcpu,
		const struct kvm_one_reg *reg, u64 *v)
{
	int id, ret = 0;
	u64 type = reg->id & KVM_REG_LOONGARCH_MASK;

	switch (type) {
	case KVM_REG_LOONGARCH_CSR:
		id = KVM_GET_IOC_CSR_IDX(reg->id);
		ret = _kvm_getcsr(vcpu, id, v);
		break;
	case KVM_REG_LOONGARCH_CPUCFG:
		id = KVM_GET_IOC_CPUCFG_IDX(reg->id);
		if (id >= 0 && id < KVM_MAX_CPUCFG_REGS)
			*v = vcpu->arch.cpucfg[id];
		else
			ret = -EINVAL;
		break;
	case KVM_REG_LOONGARCH_LBT:
		if (!kvm_guest_has_lbt(&vcpu->arch))
			return -ENXIO;

		switch (reg->id) {
		case KVM_REG_LOONGARCH_LBT_SCR0:
			*v = vcpu->arch.lbt.scr0;
			break;
		case KVM_REG_LOONGARCH_LBT_SCR1:
			*v = vcpu->arch.lbt.scr1;
			break;
		case KVM_REG_LOONGARCH_LBT_SCR2:
			*v = vcpu->arch.lbt.scr2;
			break;
		case KVM_REG_LOONGARCH_LBT_SCR3:
			*v = vcpu->arch.lbt.scr3;
			break;
		case KVM_REG_LOONGARCH_LBT_EFLAGS:
			*v = vcpu->arch.lbt.eflags;
			break;
		case KVM_REG_LOONGARCH_LBT_FTOP:
			*v = vcpu->arch.fpu.ftop;
			break;
		default:
			ret = -EINVAL;
			break;
		}
		break;
	case KVM_REG_LOONGARCH_KVM:
		switch (reg->id) {
		case KVM_REG_LOONGARCH_COUNTER:
			*v = drdtime() + vcpu->kvm->arch.time_offset;
			break;
		case KVM_REG_LOONGARCH_DEBUG_INST:
			*v = INSN_HVCL | KVM_HCALL_SWDBG;
			break;
		default:
			ret = -EINVAL;
			break;
		}
		break;
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static int kvm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
{
	int ret = 0;
	u64 v, size = reg->id & KVM_REG_SIZE_MASK;

	switch (size) {
	case KVM_REG_SIZE_U64:
		ret = kvm_get_one_reg(vcpu, reg, &v);
		if (ret)
			return ret;
		ret = put_user(v, (u64 __user *)(long)reg->addr);
		break;
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static int kvm_set_one_reg(struct kvm_vcpu *vcpu,
			const struct kvm_one_reg *reg, u64 v)
{
	int id, ret = 0;
	u64 type = reg->id & KVM_REG_LOONGARCH_MASK;

	switch (type) {
	case KVM_REG_LOONGARCH_CSR:
		id = KVM_GET_IOC_CSR_IDX(reg->id);
		ret = _kvm_setcsr(vcpu, id, v);
		break;
	case KVM_REG_LOONGARCH_CPUCFG:
		id = KVM_GET_IOC_CPUCFG_IDX(reg->id);
		ret = kvm_check_cpucfg(id, v);
		if (ret)
			break;
		vcpu->arch.cpucfg[id] = (u32)v;
		if (id == LOONGARCH_CPUCFG6)
			vcpu->arch.max_pmu_csrid =
				LOONGARCH_CSR_PERFCTRL0 + 2 * kvm_get_pmu_num(&vcpu->arch) + 1;
		break;
	case KVM_REG_LOONGARCH_LBT:
		if (!kvm_guest_has_lbt(&vcpu->arch))
			return -ENXIO;

		switch (reg->id) {
		case KVM_REG_LOONGARCH_LBT_SCR0:
			vcpu->arch.lbt.scr0 = v;
			break;
		case KVM_REG_LOONGARCH_LBT_SCR1:
			vcpu->arch.lbt.scr1 = v;
			break;
		case KVM_REG_LOONGARCH_LBT_SCR2:
			vcpu->arch.lbt.scr2 = v;
			break;
		case KVM_REG_LOONGARCH_LBT_SCR3:
			vcpu->arch.lbt.scr3 = v;
			break;
		case KVM_REG_LOONGARCH_LBT_EFLAGS:
			vcpu->arch.lbt.eflags = v;
			break;
		case KVM_REG_LOONGARCH_LBT_FTOP:
			vcpu->arch.fpu.ftop = v;
			break;
		default:
			ret = -EINVAL;
			break;
		}
		break;
	case KVM_REG_LOONGARCH_KVM:
		switch (reg->id) {
		case KVM_REG_LOONGARCH_COUNTER:
			/*
			 * gftoffset is relative with board, not vcpu
			 * only set for the first time for smp system
			 */
			if (vcpu->vcpu_id == 0)
				vcpu->kvm->arch.time_offset = (signed long)(v - drdtime());
			break;
		case KVM_REG_LOONGARCH_VCPU_RESET:
			vcpu->arch.st.guest_addr = 0;
			memset(&vcpu->arch.irq_pending, 0, sizeof(vcpu->arch.irq_pending));
			memset(&vcpu->arch.irq_clear, 0, sizeof(vcpu->arch.irq_clear));

			/*
			 * When vCPU reset, clear the ESTAT and GINTC registers
			 * Other CSR registers are cleared with function _kvm_setcsr().
			 */
			kvm_write_sw_gcsr(vcpu->arch.csr, LOONGARCH_CSR_GINTC, 0);
			kvm_write_sw_gcsr(vcpu->arch.csr, LOONGARCH_CSR_ESTAT, 0);
			break;
		default:
			ret = -EINVAL;
			break;
		}
		break;
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static int kvm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
{
	int ret = 0;
	u64 v, size = reg->id & KVM_REG_SIZE_MASK;

	switch (size) {
	case KVM_REG_SIZE_U64:
		ret = get_user(v, (u64 __user *)(long)reg->addr);
		if (ret)
			return ret;
		break;
	default:
		return -EINVAL;
	}

	return kvm_set_one_reg(vcpu, reg, v);
}

int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
{
	return -ENOIOCTLCMD;
}

int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
{
	return -ENOIOCTLCMD;
}

int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
		regs->gpr[i] = vcpu->arch.gprs[i];

	regs->pc = vcpu->arch.pc;

	return 0;
}

int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
	int i;

	for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
		vcpu->arch.gprs[i] = regs->gpr[i];

	vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */
	vcpu->arch.pc = regs->pc;

	return 0;
}

static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
				     struct kvm_enable_cap *cap)
{
	/* FPU is enabled by default, will support LSX/LASX later. */
	return -EINVAL;
}

static int kvm_loongarch_cpucfg_has_attr(struct kvm_vcpu *vcpu,
					 struct kvm_device_attr *attr)
{
	switch (attr->attr) {
	case LOONGARCH_CPUCFG2:
	case LOONGARCH_CPUCFG6:
		return 0;
	case CPUCFG_KVM_FEATURE:
		return 0;
	default:
		return -ENXIO;
	}

	return -ENXIO;
}

static int kvm_loongarch_pvtime_has_attr(struct kvm_vcpu *vcpu,
					 struct kvm_device_attr *attr)
{
	if (!kvm_guest_has_pv_feature(vcpu, KVM_FEATURE_STEAL_TIME)
			|| attr->attr != KVM_LOONGARCH_VCPU_PVTIME_GPA)
		return -ENXIO;

	return 0;
}

static int kvm_loongarch_vcpu_has_attr(struct kvm_vcpu *vcpu,
				       struct kvm_device_attr *attr)
{
	int ret = -ENXIO;

	switch (attr->group) {
	case KVM_LOONGARCH_VCPU_CPUCFG:
		ret = kvm_loongarch_cpucfg_has_attr(vcpu, attr);
		break;
	case KVM_LOONGARCH_VCPU_PVTIME_CTRL:
		ret = kvm_loongarch_pvtime_has_attr(vcpu, attr);
		break;
	default:
		break;
	}

	return ret;
}

static int kvm_loongarch_cpucfg_get_attr(struct kvm_vcpu *vcpu,
					 struct kvm_device_attr *attr)
{
	int ret = 0;
	uint64_t val;
	uint64_t __user *uaddr = (uint64_t __user *)attr->addr;

	switch (attr->attr) {
	case 0 ... (KVM_MAX_CPUCFG_REGS - 1):
		ret = _kvm_get_cpucfg_mask(attr->attr, &val);
		if (ret)
			return ret;
		break;
	case CPUCFG_KVM_FEATURE:
		val = vcpu->kvm->arch.pv_features & LOONGARCH_PV_FEAT_MASK;
		break;
	default:
		return -ENXIO;
	}

	put_user(val, uaddr);

	return ret;
}

static int kvm_loongarch_pvtime_get_attr(struct kvm_vcpu *vcpu,
					 struct kvm_device_attr *attr)
{
	u64 gpa;
	u64 __user *user = (u64 __user *)attr->addr;

	if (!kvm_guest_has_pv_feature(vcpu, KVM_FEATURE_STEAL_TIME)
			|| attr->attr != KVM_LOONGARCH_VCPU_PVTIME_GPA)
		return -ENXIO;

	gpa = vcpu->arch.st.guest_addr;
	if (put_user(gpa, user))
		return -EFAULT;

	return 0;
}

static int kvm_loongarch_vcpu_get_attr(struct kvm_vcpu *vcpu,
				       struct kvm_device_attr *attr)
{
	int ret = -ENXIO;

	switch (attr->group) {
	case KVM_LOONGARCH_VCPU_CPUCFG:
		ret = kvm_loongarch_cpucfg_get_attr(vcpu, attr);
		break;
	case KVM_LOONGARCH_VCPU_PVTIME_CTRL:
		ret = kvm_loongarch_pvtime_get_attr(vcpu, attr);
		break;
	default:
		break;
	}

	return ret;
}

static int kvm_loongarch_cpucfg_set_attr(struct kvm_vcpu *vcpu,
					 struct kvm_device_attr *attr)
{
	u64 val, valid;
	u64 __user *user = (u64 __user *)attr->addr;
	struct kvm *kvm = vcpu->kvm;

	switch (attr->attr) {
	case CPUCFG_KVM_FEATURE:
		if (get_user(val, user))
			return -EFAULT;

		valid = LOONGARCH_PV_FEAT_MASK;
		if (val & ~valid)
			return -EINVAL;

		/* All vCPUs need set the same PV features */
		if ((kvm->arch.pv_features & LOONGARCH_PV_FEAT_UPDATED)
				&& ((kvm->arch.pv_features & valid) != val))
			return -EINVAL;
		kvm->arch.pv_features = val | LOONGARCH_PV_FEAT_UPDATED;
		return 0;
	default:
		return -ENXIO;
	}
}

static int kvm_loongarch_pvtime_set_attr(struct kvm_vcpu *vcpu,
					 struct kvm_device_attr *attr)
{
	int idx, ret = 0;
	u64 gpa, __user *user = (u64 __user *)attr->addr;
	struct kvm *kvm = vcpu->kvm;

	if (!kvm_guest_has_pv_feature(vcpu, KVM_FEATURE_STEAL_TIME)
			|| attr->attr != KVM_LOONGARCH_VCPU_PVTIME_GPA)
		return -ENXIO;

	if (get_user(gpa, user))
		return -EFAULT;

	if (gpa & ~(KVM_STEAL_PHYS_MASK | KVM_STEAL_PHYS_VALID))
		return -EINVAL;

	if (!(gpa & KVM_STEAL_PHYS_VALID)) {
		vcpu->arch.st.guest_addr = gpa;
		return 0;
	}

	/* Check the address is in a valid memslot */
	idx = srcu_read_lock(&kvm->srcu);
	if (kvm_is_error_hva(gfn_to_hva(kvm, gpa >> PAGE_SHIFT)))
		ret = -EINVAL;
	srcu_read_unlock(&kvm->srcu, idx);

	if (!ret) {
		vcpu->arch.st.guest_addr = gpa;
		vcpu->arch.st.last_steal = current->sched_info.run_delay;
		kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
	}

	return ret;
}

static int kvm_loongarch_vcpu_set_attr(struct kvm_vcpu *vcpu,
				       struct kvm_device_attr *attr)
{
	int ret = -ENXIO;

	switch (attr->group) {
	case KVM_LOONGARCH_VCPU_CPUCFG:
		ret = kvm_loongarch_cpucfg_set_attr(vcpu, attr);
		break;
	case KVM_LOONGARCH_VCPU_PVTIME_CTRL:
		ret = kvm_loongarch_pvtime_set_attr(vcpu, attr);
		break;
	default:
		break;
	}

	return ret;
}

long kvm_arch_vcpu_ioctl(struct file *filp,
			 unsigned int ioctl, unsigned long arg)
{
	long r;
	struct kvm_device_attr attr;
	void __user *argp = (void __user *)arg;
	struct kvm_vcpu *vcpu = filp->private_data;

	/*
	 * Only software CSR should be modified
	 *
	 * If any hardware CSR register is modified, vcpu_load/vcpu_put pair
	 * should be used. Since CSR registers owns by this vcpu, if switch
	 * to other vcpus, other vcpus need reload CSR registers.
	 *
	 * If software CSR is modified, bit KVM_LARCH_HWCSR_USABLE should
	 * be clear in vcpu->arch.aux_inuse, and vcpu_load will check
	 * aux_inuse flag and reload CSR registers form software.
	 */

	switch (ioctl) {
	case KVM_SET_ONE_REG:
	case KVM_GET_ONE_REG: {
		struct kvm_one_reg reg;

		r = -EFAULT;
		if (copy_from_user(&reg, argp, sizeof(reg)))
			break;
		if (ioctl == KVM_SET_ONE_REG) {
			r = kvm_set_reg(vcpu, &reg);
			vcpu->arch.aux_inuse &= ~KVM_LARCH_HWCSR_USABLE;
		} else
			r = kvm_get_reg(vcpu, &reg);
		break;
	}
	case KVM_ENABLE_CAP: {
		struct kvm_enable_cap cap;

		r = -EFAULT;
		if (copy_from_user(&cap, argp, sizeof(cap)))
			break;
		r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
		break;
	}
	case KVM_HAS_DEVICE_ATTR: {
		r = -EFAULT;
		if (copy_from_user(&attr, argp, sizeof(attr)))
			break;
		r = kvm_loongarch_vcpu_has_attr(vcpu, &attr);
		break;
	}
	case KVM_GET_DEVICE_ATTR: {
		r = -EFAULT;
		if (copy_from_user(&attr, argp, sizeof(attr)))
			break;
		r = kvm_loongarch_vcpu_get_attr(vcpu, &attr);
		break;
	}
	case KVM_SET_DEVICE_ATTR: {
		r = -EFAULT;
		if (copy_from_user(&attr, argp, sizeof(attr)))
			break;
		r = kvm_loongarch_vcpu_set_attr(vcpu, &attr);
		break;
	}
	default:
		r = -ENOIOCTLCMD;
		break;
	}

	return r;
}

int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
	int i = 0;

	fpu->fcc = vcpu->arch.fpu.fcc;
	fpu->fcsr = vcpu->arch.fpu.fcsr;
	for (i = 0; i < NUM_FPU_REGS; i++)
		memcpy(&fpu->fpr[i], &vcpu->arch.fpu.fpr[i], FPU_REG_WIDTH / 64);

	return 0;
}

int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
	int i = 0;

	vcpu->arch.fpu.fcc = fpu->fcc;
	vcpu->arch.fpu.fcsr = fpu->fcsr;
	for (i = 0; i < NUM_FPU_REGS; i++)
		memcpy(&vcpu->arch.fpu.fpr[i], &fpu->fpr[i], FPU_REG_WIDTH / 64);

	return 0;
}

#ifdef CONFIG_CPU_HAS_LBT
int kvm_own_lbt(struct kvm_vcpu *vcpu)
{
	if (!kvm_guest_has_lbt(&vcpu->arch))
		return -EINVAL;

	preempt_disable();
	if (!(vcpu->arch.aux_inuse & KVM_LARCH_LBT)) {
		set_csr_euen(CSR_EUEN_LBTEN);
		_restore_lbt(&vcpu->arch.lbt);
		vcpu->arch.aux_inuse |= KVM_LARCH_LBT;
	}
	preempt_enable();

	return 0;
}

static void kvm_lose_lbt(struct kvm_vcpu *vcpu)
{
	preempt_disable();
	if (vcpu->arch.aux_inuse & KVM_LARCH_LBT) {
		_save_lbt(&vcpu->arch.lbt);
		clear_csr_euen(CSR_EUEN_LBTEN);
		vcpu->arch.aux_inuse &= ~KVM_LARCH_LBT;
	}
	preempt_enable();
}

static void kvm_check_fcsr(struct kvm_vcpu *vcpu, unsigned long fcsr)
{
	/*
	 * If TM is enabled, top register save/restore will
	 * cause lbt exception, here enable lbt in advance
	 */
	if (fcsr & FPU_CSR_TM)
		kvm_own_lbt(vcpu);
}

static void kvm_check_fcsr_alive(struct kvm_vcpu *vcpu)
{
	if (vcpu->arch.aux_inuse & KVM_LARCH_FPU) {
		if (vcpu->arch.aux_inuse & KVM_LARCH_LBT)
			return;
		kvm_check_fcsr(vcpu, read_fcsr(LOONGARCH_FCSR0));
	}
}
#else
static inline void kvm_lose_lbt(struct kvm_vcpu *vcpu) { }
static inline void kvm_check_fcsr(struct kvm_vcpu *vcpu, unsigned long fcsr) { }
static inline void kvm_check_fcsr_alive(struct kvm_vcpu *vcpu) { }
#endif

/* Enable FPU and restore context */
void kvm_own_fpu(struct kvm_vcpu *vcpu)
{
	preempt_disable();

	/*
	 * Enable FPU for guest
	 * Set FR and FRE according to guest context
	 */
	kvm_check_fcsr(vcpu, vcpu->arch.fpu.fcsr);
	set_csr_euen(CSR_EUEN_FPEN);

	kvm_restore_fpu(&vcpu->arch.fpu);
	vcpu->arch.aux_inuse |= KVM_LARCH_FPU;
	trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE, KVM_TRACE_AUX_FPU);

	preempt_enable();
}

#ifdef CONFIG_CPU_HAS_LSX
/* Enable LSX and restore context */
int kvm_own_lsx(struct kvm_vcpu *vcpu)
{
	if (!kvm_guest_has_fpu(&vcpu->arch) || !kvm_guest_has_lsx(&vcpu->arch))
		return -EINVAL;

	preempt_disable();

	/* Enable LSX for guest */
	kvm_check_fcsr(vcpu, vcpu->arch.fpu.fcsr);
	set_csr_euen(CSR_EUEN_LSXEN | CSR_EUEN_FPEN);
	switch (vcpu->arch.aux_inuse & KVM_LARCH_FPU) {
	case KVM_LARCH_FPU:
		/*
		 * Guest FPU state already loaded,
		 * only restore upper LSX state
		 */
		_restore_lsx_upper(&vcpu->arch.fpu);
		break;
	default:
		/* Neither FP or LSX already active,
		 * restore full LSX state
		 */
		kvm_restore_lsx(&vcpu->arch.fpu);
		break;
	}

	trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE, KVM_TRACE_AUX_LSX);
	vcpu->arch.aux_inuse |= KVM_LARCH_LSX | KVM_LARCH_FPU;
	preempt_enable();

	return 0;
}
#endif

#ifdef CONFIG_CPU_HAS_LASX
/* Enable LASX and restore context */
int kvm_own_lasx(struct kvm_vcpu *vcpu)
{
	if (!kvm_guest_has_fpu(&vcpu->arch) || !kvm_guest_has_lsx(&vcpu->arch) || !kvm_guest_has_lasx(&vcpu->arch))
		return -EINVAL;

	preempt_disable();

	kvm_check_fcsr(vcpu, vcpu->arch.fpu.fcsr);
	set_csr_euen(CSR_EUEN_FPEN | CSR_EUEN_LSXEN | CSR_EUEN_LASXEN);
	switch (vcpu->arch.aux_inuse & (KVM_LARCH_FPU | KVM_LARCH_LSX)) {
	case KVM_LARCH_LSX:
	case KVM_LARCH_LSX | KVM_LARCH_FPU:
		/* Guest LSX state already loaded, only restore upper LASX state */
		_restore_lasx_upper(&vcpu->arch.fpu);
		break;
	case KVM_LARCH_FPU:
		/* Guest FP state already loaded, only restore upper LSX & LASX state */
		_restore_lsx_upper(&vcpu->arch.fpu);
		_restore_lasx_upper(&vcpu->arch.fpu);
		break;
	default:
		/* Neither FP or LSX already active, restore full LASX state */
		kvm_restore_lasx(&vcpu->arch.fpu);
		break;
	}

	trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE, KVM_TRACE_AUX_LASX);
	vcpu->arch.aux_inuse |= KVM_LARCH_LASX | KVM_LARCH_LSX | KVM_LARCH_FPU;
	preempt_enable();

	return 0;
}
#endif

/* Save context and disable FPU */
void kvm_lose_fpu(struct kvm_vcpu *vcpu)
{
	preempt_disable();

	kvm_check_fcsr_alive(vcpu);
	if (vcpu->arch.aux_inuse & KVM_LARCH_LASX) {
		kvm_save_lasx(&vcpu->arch.fpu);
		vcpu->arch.aux_inuse &= ~(KVM_LARCH_LSX | KVM_LARCH_FPU | KVM_LARCH_LASX);
		trace_kvm_aux(vcpu, KVM_TRACE_AUX_SAVE, KVM_TRACE_AUX_LASX);

		/* Disable LASX & LSX & FPU */
		clear_csr_euen(CSR_EUEN_FPEN | CSR_EUEN_LSXEN | CSR_EUEN_LASXEN);
	} else if (vcpu->arch.aux_inuse & KVM_LARCH_LSX) {
		kvm_save_lsx(&vcpu->arch.fpu);
		vcpu->arch.aux_inuse &= ~(KVM_LARCH_LSX | KVM_LARCH_FPU);
		trace_kvm_aux(vcpu, KVM_TRACE_AUX_SAVE, KVM_TRACE_AUX_LSX);

		/* Disable LSX & FPU */
		clear_csr_euen(CSR_EUEN_FPEN | CSR_EUEN_LSXEN);
	} else if (vcpu->arch.aux_inuse & KVM_LARCH_FPU) {
		kvm_save_fpu(&vcpu->arch.fpu);
		vcpu->arch.aux_inuse &= ~KVM_LARCH_FPU;
		trace_kvm_aux(vcpu, KVM_TRACE_AUX_SAVE, KVM_TRACE_AUX_FPU);

		/* Disable FPU */
		clear_csr_euen(CSR_EUEN_FPEN);
	}
	kvm_lose_lbt(vcpu);

	preempt_enable();
}

int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
{
	int intr = (int)irq->irq;

	if (intr > 0)
		kvm_queue_irq(vcpu, intr);
	else if (intr < 0)
		kvm_dequeue_irq(vcpu, -intr);
	else {
		kvm_err("%s: invalid interrupt ioctl %d\n", __func__, irq->irq);
		return -EINVAL;
	}

	kvm_vcpu_kick(vcpu);

	return 0;
}

long kvm_arch_vcpu_async_ioctl(struct file *filp,
			       unsigned int ioctl, unsigned long arg)
{
	void __user *argp = (void __user *)arg;
	struct kvm_vcpu *vcpu = filp->private_data;

	if (ioctl == KVM_INTERRUPT) {
		struct kvm_interrupt irq;

		if (copy_from_user(&irq, argp, sizeof(irq)))
			return -EFAULT;

		kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__, irq.irq);

		return kvm_vcpu_ioctl_interrupt(vcpu, &irq);
	}

	return -ENOIOCTLCMD;
}

int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
{
	return 0;
}

int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
{
	unsigned long timer_hz;
	struct loongarch_csrs *csr;

	vcpu->arch.vpid = 0;
	vcpu->arch.flush_gpa = INVALID_GPA;

	hrtimer_setup(&vcpu->arch.swtimer, kvm_swtimer_wakeup, CLOCK_MONOTONIC,
		      HRTIMER_MODE_ABS_PINNED_HARD);

	/* Get GPA (=HVA) of PGD for kvm hypervisor */
	vcpu->arch.kvm_pgd = __pa(vcpu->kvm->arch.pgd);

	/*
	 * Get PGD for primary mmu, virtual address is used since there is
	 * memory access after loading from CSR_PGD in tlb exception fast path.
	 */
	vcpu->arch.host_pgd = (unsigned long)vcpu->kvm->mm->pgd;

	vcpu->arch.handle_exit = kvm_handle_exit;
	vcpu->arch.guest_eentry = (unsigned long)kvm_loongarch_ops->exc_entry;
	vcpu->arch.csr = kzalloc(sizeof(struct loongarch_csrs), GFP_KERNEL);
	if (!vcpu->arch.csr)
		return -ENOMEM;

	/*
	 * All kvm exceptions share one exception entry, and host <-> guest
	 * switch also switch ECFG.VS field, keep host ECFG.VS info here.
	 */
	vcpu->arch.host_ecfg = (read_csr_ecfg() & CSR_ECFG_VS);

	/* Init */
	vcpu->arch.last_sched_cpu = -1;

	/* Init ipi_state lock */
	spin_lock_init(&vcpu->arch.ipi_state.lock);

	/*
	 * Initialize guest register state to valid architectural reset state.
	 */
	timer_hz = calc_const_freq();
	kvm_init_timer(vcpu, timer_hz);

	/* Set Initialize mode for guest */
	csr = vcpu->arch.csr;
	kvm_write_sw_gcsr(csr, LOONGARCH_CSR_CRMD, CSR_CRMD_DA);

	/* Set cpuid */
	kvm_write_sw_gcsr(csr, LOONGARCH_CSR_TMID, vcpu->vcpu_id);
	kvm_write_sw_gcsr(csr, LOONGARCH_CSR_CPUID, KVM_MAX_PHYID);

	/* Start with no pending virtual guest interrupts */
	csr->csrs[LOONGARCH_CSR_GINTC] = 0;

	return 0;
}

void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
{
}

void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
	int cpu;
	struct kvm_context *context;

	hrtimer_cancel(&vcpu->arch.swtimer);
	kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_cache);
	kvm_drop_cpuid(vcpu);
	kfree(vcpu->arch.csr);

	/*
	 * If the vCPU is freed and reused as another vCPU, we don't want the
	 * matching pointer wrongly hanging around in last_vcpu.
	 */
	for_each_possible_cpu(cpu) {
		context = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu);
		if (context->last_vcpu == vcpu)
			context->last_vcpu = NULL;
	}
}

static int _kvm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
	bool migrated;
	struct kvm_context *context;
	struct loongarch_csrs *csr = vcpu->arch.csr;

	/*
	 * Have we migrated to a different CPU?
	 * If so, any old guest TLB state may be stale.
	 */
	migrated = (vcpu->arch.last_sched_cpu != cpu);

	/*
	 * Was this the last vCPU to run on this CPU?
	 * If not, any old guest state from this vCPU will have been clobbered.
	 */
	context = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu);
	if (migrated || (context->last_vcpu != vcpu))
		vcpu->arch.aux_inuse &= ~KVM_LARCH_HWCSR_USABLE;
	context->last_vcpu = vcpu;

	/* Restore timer state regardless */
	kvm_restore_timer(vcpu);
	kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);

	/* Don't bother restoring registers multiple times unless necessary */
	if (vcpu->arch.aux_inuse & KVM_LARCH_HWCSR_USABLE)
		return 0;

	write_csr_gcntc((ulong)vcpu->kvm->arch.time_offset);

	/* Restore guest CSR registers */
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_CRMD);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PRMD);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_EUEN);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_MISC);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ECFG);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ERA);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_BADV);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_BADI);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_EENTRY);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBIDX);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBEHI);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBELO0);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBELO1);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ASID);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PGDL);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PGDH);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PWCTL0);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PWCTL1);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_STLBPGSIZE);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_RVACFG);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_CPUID);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS0);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS1);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS2);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS3);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS4);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS5);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS6);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS7);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TMID);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_CNTC);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRENTRY);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRBADV);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRERA);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRSAVE);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRELO0);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRELO1);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBREHI);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRPRMD);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN0);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN1);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN2);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN3);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_LLBCTL);

	/* Restore Root.GINTC from unused Guest.GINTC register */
	write_csr_gintc(csr->csrs[LOONGARCH_CSR_GINTC]);

	/*
	 * We should clear linked load bit to break interrupted atomics. This
	 * prevents a SC on the next vCPU from succeeding by matching a LL on
	 * the previous vCPU.
	 */
	if (vcpu->kvm->created_vcpus > 1)
		set_gcsr_llbctl(CSR_LLBCTL_WCLLB);

	vcpu->arch.aux_inuse |= KVM_LARCH_HWCSR_USABLE;

	return 0;
}

void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
	unsigned long flags;

	local_irq_save(flags);
	/* Restore guest state to registers */
	_kvm_vcpu_load(vcpu, cpu);
	local_irq_restore(flags);
}

static int _kvm_vcpu_put(struct kvm_vcpu *vcpu, int cpu)
{
	struct loongarch_csrs *csr = vcpu->arch.csr;

	kvm_lose_fpu(vcpu);

	/*
	 * Update CSR state from hardware if software CSR state is stale,
	 * most CSR registers are kept unchanged during process context
	 * switch except CSR registers like remaining timer tick value and
	 * injected interrupt state.
	 */
	if (vcpu->arch.aux_inuse & KVM_LARCH_SWCSR_LATEST)
		goto out;

	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_CRMD);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PRMD);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_EUEN);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_MISC);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ECFG);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ERA);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_BADV);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_BADI);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_EENTRY);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBIDX);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBEHI);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBELO0);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBELO1);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ASID);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PGDL);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PGDH);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PWCTL0);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PWCTL1);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_STLBPGSIZE);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_RVACFG);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_CPUID);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PRCFG1);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PRCFG2);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PRCFG3);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS0);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS1);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS2);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS3);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS4);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS5);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS6);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS7);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TMID);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_CNTC);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_LLBCTL);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRENTRY);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRBADV);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRERA);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRSAVE);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRELO0);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRELO1);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBREHI);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRPRMD);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN0);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN1);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN2);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN3);

	vcpu->arch.aux_inuse |= KVM_LARCH_SWCSR_LATEST;

out:
	kvm_save_timer(vcpu);
	/* Save Root.GINTC into unused Guest.GINTC register */
	csr->csrs[LOONGARCH_CSR_GINTC] = read_csr_gintc();

	return 0;
}

void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
	int cpu;
	unsigned long flags;

	local_irq_save(flags);
	cpu = smp_processor_id();
	vcpu->arch.last_sched_cpu = cpu;

	/* Save guest state in registers */
	_kvm_vcpu_put(vcpu, cpu);
	local_irq_restore(flags);
}

int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
{
	int r = -EINTR;
	struct kvm_run *run = vcpu->run;

	if (vcpu->mmio_needed) {
		if (!vcpu->mmio_is_write)
			kvm_complete_mmio_read(vcpu, run);
		vcpu->mmio_needed = 0;
	}

	switch (run->exit_reason) {
	case KVM_EXIT_HYPERCALL:
		kvm_complete_user_service(vcpu, run);
		break;
	case KVM_EXIT_LOONGARCH_IOCSR:
		if (!run->iocsr_io.is_write)
			kvm_complete_iocsr_read(vcpu, run);
		break;
	}

	if (!vcpu->wants_to_run)
		return r;

	/* Clear exit_reason */
	run->exit_reason = KVM_EXIT_UNKNOWN;
	lose_fpu(1);
	vcpu_load(vcpu);
	kvm_sigset_activate(vcpu);
	r = kvm_pre_enter_guest(vcpu);
	if (r != RESUME_GUEST)
		goto out;

	guest_timing_enter_irqoff();
	guest_state_enter_irqoff();
	trace_kvm_enter(vcpu);
	r = kvm_loongarch_ops->enter_guest(run, vcpu);

	trace_kvm_out(vcpu);
	/*
	 * Guest exit is already recorded at kvm_handle_exit()
	 * return value must not be RESUME_GUEST
	 */
	local_irq_enable();
out:
	kvm_sigset_deactivate(vcpu);
	vcpu_put(vcpu);

	return r;
}