x86/kernel/reboot.c

// SPDX-License-Identifier: GPL-2.0
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/export.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/pm.h>
#include <linux/efi.h>
#include <linux/dmi.h>
#include <linux/sched.h>
#include <linux/tboot.h>
#include <linux/delay.h>
#include <linux/objtool.h>
#include <linux/pgtable.h>
#include <acpi/reboot.h>
#include <asm/io.h>
#include <asm/apic.h>
#include <asm/io_apic.h>
#include <asm/desc.h>
#include <asm/hpet.h>
#include <asm/proto.h>
#include <asm/reboot_fixups.h>
#include <asm/reboot.h>
#include <asm/pci_x86.h>
#include <asm/cpu.h>
#include <asm/nmi.h>
#include <asm/smp.h>

#include <linux/ctype.h>
#include <linux/mc146818rtc.h>
#include <asm/realmode.h>
#include <asm/x86_init.h>
#include <asm/efi.h>

/*
 * Power off function, if any
 */
void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);

/*
 * This is set if we need to go through the 'emergency' path.
 * When machine_emergency_restart() is called, we may be on
 * an inconsistent state and won't be able to do a clean cleanup
 */
static int reboot_emergency;

/* This is set by the PCI code if either type 1 or type 2 PCI is detected */
bool port_cf9_safe = false;

/*
 * Reboot options and system auto-detection code provided by
 * Dell Inc. so their systems "just work". :-)
 */

/*
 * Some machines require the "reboot=a" commandline options
 */
static int __init set_acpi_reboot(const struct dmi_system_id *d)
{
	if (reboot_type != BOOT_ACPI) {
		reboot_type = BOOT_ACPI;
		pr_info("%s series board detected. Selecting %s-method for reboots.\n",
			d->ident, "ACPI");
	}
	return 0;
}

/*
 * Some machines require the "reboot=b" or "reboot=k"  commandline options,
 * this quirk makes that automatic.
 */
static int __init set_bios_reboot(const struct dmi_system_id *d)
{
	if (reboot_type != BOOT_BIOS) {
		reboot_type = BOOT_BIOS;
		pr_info("%s series board detected. Selecting %s-method for reboots.\n",
			d->ident, "BIOS");
	}
	return 0;
}

/*
 * Some machines don't handle the default ACPI reboot method and
 * require the EFI reboot method:
 */
static int __init set_efi_reboot(const struct dmi_system_id *d)
{
	if (reboot_type != BOOT_EFI && !efi_runtime_disabled()) {
		reboot_type = BOOT_EFI;
		pr_info("%s series board detected. Selecting EFI-method for reboot.\n", d->ident);
	}
	return 0;
}

void __noreturn machine_real_restart(unsigned int type)
{
	local_irq_disable();

	/*
	 * Write zero to CMOS register number 0x0f, which the BIOS POST
	 * routine will recognize as telling it to do a proper reboot.  (Well
	 * that's what this book in front of me says -- it may only apply to
	 * the Phoenix BIOS though, it's not clear).  At the same time,
	 * disable NMIs by setting the top bit in the CMOS address register,
	 * as we're about to do peculiar things to the CPU.  I'm not sure if
	 * `outb_p' is needed instead of just `outb'.  Use it to be on the
	 * safe side.  (Yes, CMOS_WRITE does outb_p's. -  Paul G.)
	 */
	spin_lock(&rtc_lock);
	CMOS_WRITE(0x00, 0x8f);
	spin_unlock(&rtc_lock);

	/*
	 * Switch to the trampoline page table.
	 */
	load_trampoline_pgtable();

	/* Jump to the identity-mapped low memory code */
#ifdef CONFIG_X86_32
	asm volatile("jmpl *%0" : :
		     "rm" (real_mode_header->machine_real_restart_asm),
		     "a" (type));
#else
	asm volatile("ljmpl *%0" : :
		     "m" (real_mode_header->machine_real_restart_asm),
		     "D" (type));
#endif
	unreachable();
}
#ifdef CONFIG_APM_MODULE
EXPORT_SYMBOL(machine_real_restart);
#endif
STACK_FRAME_NON_STANDARD(machine_real_restart);

/*
 * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
 */
static int __init set_pci_reboot(const struct dmi_system_id *d)
{
	if (reboot_type != BOOT_CF9_FORCE) {
		reboot_type = BOOT_CF9_FORCE;
		pr_info("%s series board detected. Selecting %s-method for reboots.\n",
			d->ident, "PCI");
	}
	return 0;
}

static int __init set_kbd_reboot(const struct dmi_system_id *d)
{
	if (reboot_type != BOOT_KBD) {
		reboot_type = BOOT_KBD;
		pr_info("%s series board detected. Selecting %s-method for reboot.\n",
			d->ident, "KBD");
	}
	return 0;
}

/*
 * This is a single dmi_table handling all reboot quirks.
 */
static const struct dmi_system_id reboot_dmi_table[] __initconst = {

	/* Acer */
	{	/* Handle reboot issue on Acer Aspire one */
		.callback = set_kbd_reboot,
		.ident = "Acer Aspire One A110",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
		},
	},
	{	/* Handle reboot issue on Acer TravelMate X514-51T */
		.callback = set_efi_reboot,
		.ident = "Acer TravelMate X514-51T",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate X514-51T"),
		},
	},

	/* Apple */
	{	/* Handle problems with rebooting on Apple MacBook5 */
		.callback = set_pci_reboot,
		.ident = "Apple MacBook5",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
		},
	},
	{	/* Handle problems with rebooting on Apple MacBook6,1 */
		.callback = set_pci_reboot,
		.ident = "Apple MacBook6,1",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "MacBook6,1"),
		},
	},
	{	/* Handle problems with rebooting on Apple MacBookPro5 */
		.callback = set_pci_reboot,
		.ident = "Apple MacBookPro5",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"),
		},
	},
	{	/* Handle problems with rebooting on Apple Macmini3,1 */
		.callback = set_pci_reboot,
		.ident = "Apple Macmini3,1",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"),
		},
	},
	{	/* Handle problems with rebooting on the iMac9,1. */
		.callback = set_pci_reboot,
		.ident = "Apple iMac9,1",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"),
		},
	},
	{	/* Handle problems with rebooting on the iMac10,1. */
		.callback = set_pci_reboot,
		.ident = "Apple iMac10,1",
		.matches = {
		    DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
		    DMI_MATCH(DMI_PRODUCT_NAME, "iMac10,1"),
		},
	},

	/* ASRock */
	{	/* Handle problems with rebooting on ASRock Q1900DC-ITX */
		.callback = set_pci_reboot,
		.ident = "ASRock Q1900DC-ITX",
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "ASRock"),
			DMI_MATCH(DMI_BOARD_NAME, "Q1900DC-ITX"),
		},
	},

	/* ASUS */
	{	/* Handle problems with rebooting on ASUS P4S800 */
		.callback = set_bios_reboot,
		.ident = "ASUS P4S800",
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
			DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
		},
	},
	{	/* Handle problems with rebooting on ASUS EeeBook X205TA */
		.callback = set_acpi_reboot,
		.ident = "ASUS EeeBook X205TA",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
			DMI_MATCH(DMI_PRODUCT_NAME, "X205TA"),
		},
	},
	{	/* Handle problems with rebooting on ASUS EeeBook X205TAW */
		.callback = set_acpi_reboot,
		.ident = "ASUS EeeBook X205TAW",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
			DMI_MATCH(DMI_PRODUCT_NAME, "X205TAW"),
		},
	},

	/* Certec */
	{       /* Handle problems with rebooting on Certec BPC600 */
		.callback = set_pci_reboot,
		.ident = "Certec BPC600",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Certec"),
			DMI_MATCH(DMI_PRODUCT_NAME, "BPC600"),
		},
	},

	/* Dell */
	{	/* Handle problems with rebooting on Dell DXP061 */
		.callback = set_bios_reboot,
		.ident = "Dell DXP061",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
		},
	},
	{	/* Handle problems with rebooting on Dell E520's */
		.callback = set_bios_reboot,
		.ident = "Dell E520",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
		},
	},
	{	/* Handle problems with rebooting on the Latitude E5410. */
		.callback = set_pci_reboot,
		.ident = "Dell Latitude E5410",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5410"),
		},
	},
	{	/* Handle problems with rebooting on the Latitude E5420. */
		.callback = set_pci_reboot,
		.ident = "Dell Latitude E5420",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"),
		},
	},
	{	/* Handle problems with rebooting on the Latitude E6320. */
		.callback = set_pci_reboot,
		.ident = "Dell Latitude E6320",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"),
		},
	},
	{	/* Handle problems with rebooting on the Latitude E6420. */
		.callback = set_pci_reboot,
		.ident = "Dell Latitude E6420",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"),
		},
	},
	{	/* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
		.callback = set_bios_reboot,
		.ident = "Dell OptiPlex 330",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
			DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
		},
	},
	{	/* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
		.callback = set_bios_reboot,
		.ident = "Dell OptiPlex 360",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
			DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
		},
	},
	{	/* Handle problems with rebooting on Dell Optiplex 745's SFF */
		.callback = set_bios_reboot,
		.ident = "Dell OptiPlex 745",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
		},
	},
	{	/* Handle problems with rebooting on Dell Optiplex 745's DFF */
		.callback = set_bios_reboot,
		.ident = "Dell OptiPlex 745",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
			DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
		},
	},
	{	/* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
		.callback = set_bios_reboot,
		.ident = "Dell OptiPlex 745",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
			DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
		},
	},
	{	/* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */
		.callback = set_bios_reboot,
		.ident = "Dell OptiPlex 760",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
			DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
		},
	},
	{	/* Handle problems with rebooting on the OptiPlex 990. */
		.callback = set_pci_reboot,
		.ident = "Dell OptiPlex 990 BIOS A0x",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"),
			DMI_MATCH(DMI_BIOS_VERSION, "A0"),
		},
	},
	{	/* Handle problems with rebooting on Dell 300's */
		.callback = set_bios_reboot,
		.ident = "Dell PowerEdge 300",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
			DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
		},
	},
	{	/* Handle problems with rebooting on Dell 1300's */
		.callback = set_bios_reboot,
		.ident = "Dell PowerEdge 1300",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
			DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
		},
	},
	{	/* Handle problems with rebooting on Dell 2400's */
		.callback = set_bios_reboot,
		.ident = "Dell PowerEdge 2400",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
			DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
		},
	},
	{	/* Handle problems with rebooting on the Dell PowerEdge C6100. */
		.callback = set_pci_reboot,
		.ident = "Dell PowerEdge C6100",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
			DMI_MATCH(DMI_PRODUCT_NAME, "C6100"),
		},
	},
	{	/* Handle problems with rebooting on the Precision M6600. */
		.callback = set_pci_reboot,
		.ident = "Dell Precision M6600",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"),
		},
	},
	{	/* Handle problems with rebooting on Dell T5400's */
		.callback = set_bios_reboot,
		.ident = "Dell Precision T5400",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
		},
	},
	{	/* Handle problems with rebooting on Dell T7400's */
		.callback = set_bios_reboot,
		.ident = "Dell Precision T7400",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
		},
	},
	{	/* Handle problems with rebooting on Dell XPS710 */
		.callback = set_bios_reboot,
		.ident = "Dell XPS710",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
		},
	},
	{	/* Handle problems with rebooting on Dell Optiplex 7450 AIO */
		.callback = set_acpi_reboot,
		.ident = "Dell OptiPlex 7450 AIO",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 7450 AIO"),
		},
	},

	/* Hewlett-Packard */
	{	/* Handle problems with rebooting on HP laptops */
		.callback = set_bios_reboot,
		.ident = "HP Compaq Laptop",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
			DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
		},
	},

	{	/* PCIe Wifi card isn't detected after reboot otherwise */
		.callback = set_pci_reboot,
		.ident = "Zotac ZBOX CI327 nano",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "NA"),
			DMI_MATCH(DMI_PRODUCT_NAME, "ZBOX-CI327NANO-GS-01"),
		},
	},

	/* Sony */
	{	/* Handle problems with rebooting on Sony VGN-Z540N */
		.callback = set_bios_reboot,
		.ident = "Sony VGN-Z540N",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
			DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
		},
	},

	{ }
};

static int __init reboot_init(void)
{
	int rv;

	/*
	 * Only do the DMI check if reboot_type hasn't been overridden
	 * on the command line
	 */
	if (!reboot_default)
		return 0;

	/*
	 * The DMI quirks table takes precedence. If no quirks entry
	 * matches and the ACPI Hardware Reduced bit is set and EFI
	 * runtime services are enabled, force EFI reboot.
	 */
	rv = dmi_check_system(reboot_dmi_table);

	if (!rv && efi_reboot_required() && !efi_runtime_disabled())
		reboot_type = BOOT_EFI;

	return 0;
}
core_initcall(reboot_init);

static inline void kb_wait(void)
{
	int i;

	for (i = 0; i < 0x10000; i++) {
		if ((inb(0x64) & 0x02) == 0)
			break;
		udelay(2);
	}
}

static inline void nmi_shootdown_cpus_on_restart(void);

#if IS_ENABLED(CONFIG_KVM_INTEL) || IS_ENABLED(CONFIG_KVM_AMD)
/* RCU-protected callback to disable virtualization prior to reboot. */
static cpu_emergency_virt_cb __rcu *cpu_emergency_virt_callback;

void cpu_emergency_register_virt_callback(cpu_emergency_virt_cb *callback)
{
	if (WARN_ON_ONCE(rcu_access_pointer(cpu_emergency_virt_callback)))
		return;

	rcu_assign_pointer(cpu_emergency_virt_callback, callback);
}
EXPORT_SYMBOL_GPL(cpu_emergency_register_virt_callback);

void cpu_emergency_unregister_virt_callback(cpu_emergency_virt_cb *callback)
{
	if (WARN_ON_ONCE(rcu_access_pointer(cpu_emergency_virt_callback) != callback))
		return;

	rcu_assign_pointer(cpu_emergency_virt_callback, NULL);
	synchronize_rcu();
}
EXPORT_SYMBOL_GPL(cpu_emergency_unregister_virt_callback);

/*
 * Disable virtualization, i.e. VMX or SVM, to ensure INIT is recognized during
 * reboot.  VMX blocks INIT if the CPU is post-VMXON, and SVM blocks INIT if
 * GIF=0, i.e. if the crash occurred between CLGI and STGI.
 */
void cpu_emergency_disable_virtualization(void)
{
	cpu_emergency_virt_cb *callback;

	/*
	 * IRQs must be disabled as KVM enables virtualization in hardware via
	 * function call IPIs, i.e. IRQs need to be disabled to guarantee
	 * virtualization stays disabled.
	 */
	lockdep_assert_irqs_disabled();

	rcu_read_lock();
	callback = rcu_dereference(cpu_emergency_virt_callback);
	if (callback)
		callback();
	rcu_read_unlock();
}

static void emergency_reboot_disable_virtualization(void)
{
	local_irq_disable();

	/*
	 * Disable virtualization on all CPUs before rebooting to avoid hanging
	 * the system, as VMX and SVM block INIT when running in the host.
	 *
	 * We can't take any locks and we may be on an inconsistent state, so
	 * use NMIs as IPIs to tell the other CPUs to disable VMX/SVM and halt.
	 *
	 * Do the NMI shootdown even if virtualization is off on _this_ CPU, as
	 * other CPUs may have virtualization enabled.
	 */
	if (rcu_access_pointer(cpu_emergency_virt_callback)) {
		/* Safely force _this_ CPU out of VMX/SVM operation. */
		cpu_emergency_disable_virtualization();

		/* Disable VMX/SVM and halt on other CPUs. */
		nmi_shootdown_cpus_on_restart();
	}
}
#else
static void emergency_reboot_disable_virtualization(void) { }
#endif /* CONFIG_KVM_INTEL || CONFIG_KVM_AMD */

void __attribute__((weak)) mach_reboot_fixups(void)
{
}

/*
 * To the best of our knowledge Windows compatible x86 hardware expects
 * the following on reboot:
 *
 * 1) If the FADT has the ACPI reboot register flag set, try it
 * 2) If still alive, write to the keyboard controller
 * 3) If still alive, write to the ACPI reboot register again
 * 4) If still alive, write to the keyboard controller again
 * 5) If still alive, call the EFI runtime service to reboot
 * 6) If no EFI runtime service, call the BIOS to do a reboot
 *
 * We default to following the same pattern. We also have
 * two other reboot methods: 'triple fault' and 'PCI', which
 * can be triggered via the reboot= kernel boot option or
 * via quirks.
 *
 * This means that this function can never return, it can misbehave
 * by not rebooting properly and hanging.
 */
static void native_machine_emergency_restart(void)
{
	int i;
	int attempt = 0;
	int orig_reboot_type = reboot_type;
	unsigned short mode;

	if (reboot_emergency)
		emergency_reboot_disable_virtualization();

	tboot_shutdown(TB_SHUTDOWN_REBOOT);

	/* Tell the BIOS if we want cold or warm reboot */
	mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0;
	*((unsigned short *)__va(0x472)) = mode;

	/*
	 * If an EFI capsule has been registered with the firmware then
	 * override the reboot= parameter.
	 */
	if (efi_capsule_pending(NULL)) {
		pr_info("EFI capsule is pending, forcing EFI reboot.\n");
		reboot_type = BOOT_EFI;
	}

	for (;;) {
		/* Could also try the reset bit in the Hammer NB */
		switch (reboot_type) {
		case BOOT_ACPI:
			acpi_reboot();
			reboot_type = BOOT_KBD;
			break;

		case BOOT_KBD:
			mach_reboot_fixups(); /* For board specific fixups */

			for (i = 0; i < 10; i++) {
				kb_wait();
				udelay(50);
				outb(0xfe, 0x64); /* Pulse reset low */
				udelay(50);
			}
			if (attempt == 0 && orig_reboot_type == BOOT_ACPI) {
				attempt = 1;
				reboot_type = BOOT_ACPI;
			} else {
				reboot_type = BOOT_EFI;
			}
			break;

		case BOOT_EFI:
			efi_reboot(reboot_mode, NULL);
			reboot_type = BOOT_BIOS;
			break;

		case BOOT_BIOS:
			machine_real_restart(MRR_BIOS);

			/* We're probably dead after this, but... */
			reboot_type = BOOT_CF9_SAFE;
			break;

		case BOOT_CF9_FORCE:
			port_cf9_safe = true;
			fallthrough;

		case BOOT_CF9_SAFE:
			if (port_cf9_safe) {
				u8 reboot_code = reboot_mode == REBOOT_WARM ?  0x06 : 0x0E;
				u8 cf9 = inb(0xcf9) & ~reboot_code;
				outb(cf9|2, 0xcf9); /* Request hard reset */
				udelay(50);
				/* Actually do the reset */
				outb(cf9|reboot_code, 0xcf9);
				udelay(50);
			}
			reboot_type = BOOT_TRIPLE;
			break;

		case BOOT_TRIPLE:
			idt_invalidate();
			__asm__ __volatile__("int3");

			/* We're probably dead after this, but... */
			reboot_type = BOOT_KBD;
			break;
		}
	}
}

void native_machine_shutdown(void)
{
	/* Stop the cpus and apics */
#ifdef CONFIG_X86_IO_APIC
	/*
	 * Disabling IO APIC before local APIC is a workaround for
	 * erratum AVR31 in "Intel Atom Processor C2000 Product Family
	 * Specification Update". In this situation, interrupts that target
	 * a Logical Processor whose Local APIC is either in the process of
	 * being hardware disabled or software disabled are neither delivered
	 * nor discarded. When this erratum occurs, the processor may hang.
	 *
	 * Even without the erratum, it still makes sense to quiet IO APIC
	 * before disabling Local APIC.
	 */
	clear_IO_APIC();
#endif

#ifdef CONFIG_SMP
	/*
	 * Stop all of the others. Also disable the local irq to
	 * not receive the per-cpu timer interrupt which may trigger
	 * scheduler's load balance.
	 */
	local_irq_disable();
	stop_other_cpus();
#endif

	lapic_shutdown();
	restore_boot_irq_mode();

#ifdef CONFIG_HPET_TIMER
	hpet_disable();
#endif

#ifdef CONFIG_X86_64
	x86_platform.iommu_shutdown();
#endif
}

static void __machine_emergency_restart(int emergency)
{
	reboot_emergency = emergency;
	machine_ops.emergency_restart();
}

static void native_machine_restart(char *__unused)
{
	pr_notice("machine restart\n");

	if (!reboot_force)
		machine_shutdown();
	__machine_emergency_restart(0);
}

static void native_machine_halt(void)
{
	/* Stop other cpus and apics */
	machine_shutdown();

	tboot_shutdown(TB_SHUTDOWN_HALT);

	stop_this_cpu(NULL);
}

static void native_machine_power_off(void)
{
	if (kernel_can_power_off()) {
		if (!reboot_force)
			machine_shutdown();
		do_kernel_power_off();
	}
	/* A fallback in case there is no PM info available */
	tboot_shutdown(TB_SHUTDOWN_HALT);
}

struct machine_ops machine_ops __ro_after_init = {
	.power_off = native_machine_power_off,
	.shutdown = native_machine_shutdown,
	.emergency_restart = native_machine_emergency_restart,
	.restart = native_machine_restart,
	.halt = native_machine_halt,
#ifdef CONFIG_CRASH_DUMP
	.crash_shutdown = native_machine_crash_shutdown,
#endif
};

void machine_power_off(void)
{
	machine_ops.power_off();
}

void machine_shutdown(void)
{
	machine_ops.shutdown();
}

void machine_emergency_restart(void)
{
	__machine_emergency_restart(1);
}

void machine_restart(char *cmd)
{
	machine_ops.restart(cmd);
}

void machine_halt(void)
{
	machine_ops.halt();
}

#ifdef CONFIG_CRASH_DUMP
void machine_crash_shutdown(struct pt_regs *regs)
{
	machine_ops.crash_shutdown(regs);
}
#endif

/* This is the CPU performing the emergency shutdown work. */
int crashing_cpu = -1;

#if defined(CONFIG_SMP)

static nmi_shootdown_cb shootdown_callback;

static atomic_t waiting_for_crash_ipi;
static int crash_ipi_issued;

static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
{
	int cpu;

	cpu = raw_smp_processor_id();

	/*
	 * Don't do anything if this handler is invoked on crashing cpu.
	 * Otherwise, system will completely hang. Crashing cpu can get
	 * an NMI if system was initially booted with nmi_watchdog parameter.
	 */
	if (cpu == crashing_cpu)
		return NMI_HANDLED;
	local_irq_disable();

	if (shootdown_callback)
		shootdown_callback(cpu, regs);

	/*
	 * Prepare the CPU for reboot _after_ invoking the callback so that the
	 * callback can safely use virtualization instructions, e.g. VMCLEAR.
	 */
	cpu_emergency_disable_virtualization();

	atomic_dec(&waiting_for_crash_ipi);
	/* Assume hlt works */
	halt();
	for (;;)
		cpu_relax();

	return NMI_HANDLED;
}

/**
 * nmi_shootdown_cpus - Stop other CPUs via NMI
 * @callback:	Optional callback to be invoked from the NMI handler
 *
 * The NMI handler on the remote CPUs invokes @callback, if not
 * NULL, first and then disables virtualization to ensure that
 * INIT is recognized during reboot.
 *
 * nmi_shootdown_cpus() can only be invoked once. After the first
 * invocation all other CPUs are stuck in crash_nmi_callback() and
 * cannot respond to a second NMI.
 */
void nmi_shootdown_cpus(nmi_shootdown_cb callback)
{
	unsigned long msecs;

	local_irq_disable();

	/*
	 * Avoid certain doom if a shootdown already occurred; re-registering
	 * the NMI handler will cause list corruption, modifying the callback
	 * will do who knows what, etc...
	 */
	if (WARN_ON_ONCE(crash_ipi_issued))
		return;

	/* Make a note of crashing cpu. Will be used in NMI callback. */
	crashing_cpu = safe_smp_processor_id();

	shootdown_callback = callback;

	atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
	/* Would it be better to replace the trap vector here? */
	if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback,
				 NMI_FLAG_FIRST, "crash"))
		return;		/* Return what? */
	/*
	 * Ensure the new callback function is set before sending
	 * out the NMI
	 */
	wmb();

	apic_send_IPI_allbutself(NMI_VECTOR);

	/* Kick CPUs looping in NMI context. */
	WRITE_ONCE(crash_ipi_issued, 1);

	msecs = 1000; /* Wait at most a second for the other cpus to stop */
	while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
		mdelay(1);
		msecs--;
	}

	/*
	 * Leave the nmi callback set, shootdown is a one-time thing.  Clearing
	 * the callback could result in a NULL pointer dereference if a CPU
	 * (finally) responds after the timeout expires.
	 */
}

static inline void nmi_shootdown_cpus_on_restart(void)
{
	if (!crash_ipi_issued)
		nmi_shootdown_cpus(NULL);
}

/*
 * Check if the crash dumping IPI got issued and if so, call its callback
 * directly. This function is used when we have already been in NMI handler.
 * It doesn't return.
 */
void run_crash_ipi_callback(struct pt_regs *regs)
{
	if (crash_ipi_issued)
		crash_nmi_callback(0, regs);
}

/* Override the weak function in kernel/panic.c */
void __noreturn nmi_panic_self_stop(struct pt_regs *regs)
{
	while (1) {
		/* If no CPU is preparing crash dump, we simply loop here. */
		run_crash_ipi_callback(regs);
		cpu_relax();
	}
}

#else /* !CONFIG_SMP */
void nmi_shootdown_cpus(nmi_shootdown_cb callback)
{
	/* No other CPUs to shoot down */
}

static inline void nmi_shootdown_cpus_on_restart(void) { }

void run_crash_ipi_callback(struct pt_regs *regs)
{
}
#endif