x86/sev-es: Rename sev-es.{ch} to sev.{ch}

SEV-SNP builds upon the SEV-ES functionality while adding new hardware
protection. Version 2 of the GHCB specification adds new NAE events that
are SEV-SNP specific. Rename the sev-es.{ch} to sev.{ch} so that all
SEV* functionality can be consolidated in one place.

Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Joerg Roedel <jroedel@suse.de>
Link: https://lkml.kernel.org/r/20210427111636.1207-2-brijesh.singh@amd.com

1 files changed, 0 insertions, 1461 deletions

diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
deleted file mode 100644
index 73873b007838..000000000000
--- a/arch/x86/kernel/sev-es.c
+++ /dev/null
@@ -1,1461 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * AMD Memory Encryption Support
- *
- * Copyright (C) 2019 SUSE
- *
- * Author: Joerg Roedel <jroedel@suse.de>
- */
-
-#define pr_fmt(fmt)	"SEV-ES: " fmt
-
-#include <linux/sched/debug.h>	/* For show_regs() */
-#include <linux/percpu-defs.h>
-#include <linux/mem_encrypt.h>
-#include <linux/lockdep.h>
-#include <linux/printk.h>
-#include <linux/mm_types.h>
-#include <linux/set_memory.h>
-#include <linux/memblock.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-
-#include <asm/cpu_entry_area.h>
-#include <asm/stacktrace.h>
-#include <asm/sev-es.h>
-#include <asm/insn-eval.h>
-#include <asm/fpu/internal.h>
-#include <asm/processor.h>
-#include <asm/realmode.h>
-#include <asm/traps.h>
-#include <asm/svm.h>
-#include <asm/smp.h>
-#include <asm/cpu.h>
-
-#define DR7_RESET_VALUE        0x400
-
-/* For early boot hypervisor communication in SEV-ES enabled guests */
-static struct ghcb boot_ghcb_page __bss_decrypted __aligned(PAGE_SIZE);
-
-/*
- * Needs to be in the .data section because we need it NULL before bss is
- * cleared
- */
-static struct ghcb __initdata *boot_ghcb;
-
-/* #VC handler runtime per-CPU data */
-struct sev_es_runtime_data {
-	struct ghcb ghcb_page;
-
-	/* Physical storage for the per-CPU IST stack of the #VC handler */
-	char ist_stack[EXCEPTION_STKSZ] __aligned(PAGE_SIZE);
-
-	/*
-	 * Physical storage for the per-CPU fall-back stack of the #VC handler.
-	 * The fall-back stack is used when it is not safe to switch back to the
-	 * interrupted stack in the #VC entry code.
-	 */
-	char fallback_stack[EXCEPTION_STKSZ] __aligned(PAGE_SIZE);
-
-	/*
-	 * Reserve one page per CPU as backup storage for the unencrypted GHCB.
-	 * It is needed when an NMI happens while the #VC handler uses the real
-	 * GHCB, and the NMI handler itself is causing another #VC exception. In
-	 * that case the GHCB content of the first handler needs to be backed up
-	 * and restored.
-	 */
-	struct ghcb backup_ghcb;
-
-	/*
-	 * Mark the per-cpu GHCBs as in-use to detect nested #VC exceptions.
-	 * There is no need for it to be atomic, because nothing is written to
-	 * the GHCB between the read and the write of ghcb_active. So it is safe
-	 * to use it when a nested #VC exception happens before the write.
-	 *
-	 * This is necessary for example in the #VC->NMI->#VC case when the NMI
-	 * happens while the first #VC handler uses the GHCB. When the NMI code
-	 * raises a second #VC handler it might overwrite the contents of the
-	 * GHCB written by the first handler. To avoid this the content of the
-	 * GHCB is saved and restored when the GHCB is detected to be in use
-	 * already.
-	 */
-	bool ghcb_active;
-	bool backup_ghcb_active;
-
-	/*
-	 * Cached DR7 value - write it on DR7 writes and return it on reads.
-	 * That value will never make it to the real hardware DR7 as debugging
-	 * is currently unsupported in SEV-ES guests.
-	 */
-	unsigned long dr7;
-};
-
-struct ghcb_state {
-	struct ghcb *ghcb;
-};
-
-static DEFINE_PER_CPU(struct sev_es_runtime_data*, runtime_data);
-DEFINE_STATIC_KEY_FALSE(sev_es_enable_key);
-
-/* Needed in vc_early_forward_exception */
-void do_early_exception(struct pt_regs *regs, int trapnr);
-
-static void __init setup_vc_stacks(int cpu)
-{
-	struct sev_es_runtime_data *data;
-	struct cpu_entry_area *cea;
-	unsigned long vaddr;
-	phys_addr_t pa;
-
-	data = per_cpu(runtime_data, cpu);
-	cea  = get_cpu_entry_area(cpu);
-
-	/* Map #VC IST stack */
-	vaddr = CEA_ESTACK_BOT(&cea->estacks, VC);
-	pa    = __pa(data->ist_stack);
-	cea_set_pte((void *)vaddr, pa, PAGE_KERNEL);
-
-	/* Map VC fall-back stack */
-	vaddr = CEA_ESTACK_BOT(&cea->estacks, VC2);
-	pa    = __pa(data->fallback_stack);
-	cea_set_pte((void *)vaddr, pa, PAGE_KERNEL);
-}
-
-static __always_inline bool on_vc_stack(struct pt_regs *regs)
-{
-	unsigned long sp = regs->sp;
-
-	/* User-mode RSP is not trusted */
-	if (user_mode(regs))
-		return false;
-
-	/* SYSCALL gap still has user-mode RSP */
-	if (ip_within_syscall_gap(regs))
-		return false;
-
-	return ((sp >= __this_cpu_ist_bottom_va(VC)) && (sp < __this_cpu_ist_top_va(VC)));
-}
-
-/*
- * This function handles the case when an NMI is raised in the #VC
- * exception handler entry code, before the #VC handler has switched off
- * its IST stack. In this case, the IST entry for #VC must be adjusted,
- * so that any nested #VC exception will not overwrite the stack
- * contents of the interrupted #VC handler.
- *
- * The IST entry is adjusted unconditionally so that it can be also be
- * unconditionally adjusted back in __sev_es_ist_exit(). Otherwise a
- * nested sev_es_ist_exit() call may adjust back the IST entry too
- * early.
- *
- * The __sev_es_ist_enter() and __sev_es_ist_exit() functions always run
- * on the NMI IST stack, as they are only called from NMI handling code
- * right now.
- */
-void noinstr __sev_es_ist_enter(struct pt_regs *regs)
-{
-	unsigned long old_ist, new_ist;
-
-	/* Read old IST entry */
-	new_ist = old_ist = __this_cpu_read(cpu_tss_rw.x86_tss.ist[IST_INDEX_VC]);
-
-	/*
-	 * If NMI happened while on the #VC IST stack, set the new IST
-	 * value below regs->sp, so that the interrupted stack frame is
-	 * not overwritten by subsequent #VC exceptions.
-	 */
-	if (on_vc_stack(regs))
-		new_ist = regs->sp;
-
-	/*
-	 * Reserve additional 8 bytes and store old IST value so this
-	 * adjustment can be unrolled in __sev_es_ist_exit().
-	 */
-	new_ist -= sizeof(old_ist);
-	*(unsigned long *)new_ist = old_ist;
-
-	/* Set new IST entry */
-	this_cpu_write(cpu_tss_rw.x86_tss.ist[IST_INDEX_VC], new_ist);
-}
-
-void noinstr __sev_es_ist_exit(void)
-{
-	unsigned long ist;
-
-	/* Read IST entry */
-	ist = __this_cpu_read(cpu_tss_rw.x86_tss.ist[IST_INDEX_VC]);
-
-	if (WARN_ON(ist == __this_cpu_ist_top_va(VC)))
-		return;
-
-	/* Read back old IST entry and write it to the TSS */
-	this_cpu_write(cpu_tss_rw.x86_tss.ist[IST_INDEX_VC], *(unsigned long *)ist);
-}
-
-static __always_inline struct ghcb *sev_es_get_ghcb(struct ghcb_state *state)
-{
-	struct sev_es_runtime_data *data;
-	struct ghcb *ghcb;
-
-	data = this_cpu_read(runtime_data);
-	ghcb = &data->ghcb_page;
-
-	if (unlikely(data->ghcb_active)) {
-		/* GHCB is already in use - save its contents */
-
-		if (unlikely(data->backup_ghcb_active))
-			return NULL;
-
-		/* Mark backup_ghcb active before writing to it */
-		data->backup_ghcb_active = true;
-
-		state->ghcb = &data->backup_ghcb;
-
-		/* Backup GHCB content */
-		*state->ghcb = *ghcb;
-	} else {
-		state->ghcb = NULL;
-		data->ghcb_active = true;
-	}
-
-	return ghcb;
-}
-
-static __always_inline void sev_es_put_ghcb(struct ghcb_state *state)
-{
-	struct sev_es_runtime_data *data;
-	struct ghcb *ghcb;
-
-	data = this_cpu_read(runtime_data);
-	ghcb = &data->ghcb_page;
-
-	if (state->ghcb) {
-		/* Restore GHCB from Backup */
-		*ghcb = *state->ghcb;
-		data->backup_ghcb_active = false;
-		state->ghcb = NULL;
-	} else {
-		data->ghcb_active = false;
-	}
-}
-
-/* Needed in vc_early_forward_exception */
-void do_early_exception(struct pt_regs *regs, int trapnr);
-
-static inline u64 sev_es_rd_ghcb_msr(void)
-{
-	return __rdmsr(MSR_AMD64_SEV_ES_GHCB);
-}
-
-static __always_inline void sev_es_wr_ghcb_msr(u64 val)
-{
-	u32 low, high;
-
-	low  = (u32)(val);
-	high = (u32)(val >> 32);
-
-	native_wrmsr(MSR_AMD64_SEV_ES_GHCB, low, high);
-}
-
-static int vc_fetch_insn_kernel(struct es_em_ctxt *ctxt,
-				unsigned char *buffer)
-{
-	return copy_from_kernel_nofault(buffer, (unsigned char *)ctxt->regs->ip, MAX_INSN_SIZE);
-}
-
-static enum es_result __vc_decode_user_insn(struct es_em_ctxt *ctxt)
-{
-	char buffer[MAX_INSN_SIZE];
-	int res;
-
-	res = insn_fetch_from_user_inatomic(ctxt->regs, buffer);
-	if (!res) {
-		ctxt->fi.vector     = X86_TRAP_PF;
-		ctxt->fi.error_code = X86_PF_INSTR | X86_PF_USER;
-		ctxt->fi.cr2        = ctxt->regs->ip;
-		return ES_EXCEPTION;
-	}
-
-	if (!insn_decode_from_regs(&ctxt->insn, ctxt->regs, buffer, res))
-		return ES_DECODE_FAILED;
-
-	if (ctxt->insn.immediate.got)
-		return ES_OK;
-	else
-		return ES_DECODE_FAILED;
-}
-
-static enum es_result __vc_decode_kern_insn(struct es_em_ctxt *ctxt)
-{
-	char buffer[MAX_INSN_SIZE];
-	int res, ret;
-
-	res = vc_fetch_insn_kernel(ctxt, buffer);
-	if (res) {
-		ctxt->fi.vector     = X86_TRAP_PF;
-		ctxt->fi.error_code = X86_PF_INSTR;
-		ctxt->fi.cr2        = ctxt->regs->ip;
-		return ES_EXCEPTION;
-	}
-
-	ret = insn_decode(&ctxt->insn, buffer, MAX_INSN_SIZE, INSN_MODE_64);
-	if (ret < 0)
-		return ES_DECODE_FAILED;
-	else
-		return ES_OK;
-}
-
-static enum es_result vc_decode_insn(struct es_em_ctxt *ctxt)
-{
-	if (user_mode(ctxt->regs))
-		return __vc_decode_user_insn(ctxt);
-	else
-		return __vc_decode_kern_insn(ctxt);
-}
-
-static enum es_result vc_write_mem(struct es_em_ctxt *ctxt,
-				   char *dst, char *buf, size_t size)
-{
-	unsigned long error_code = X86_PF_PROT | X86_PF_WRITE;
-	char __user *target = (char __user *)dst;
-	u64 d8;
-	u32 d4;
-	u16 d2;
-	u8  d1;
-
-	/* If instruction ran in kernel mode and the I/O buffer is in kernel space */
-	if (!user_mode(ctxt->regs) && !access_ok(target, size)) {
-		memcpy(dst, buf, size);
-		return ES_OK;
-	}
-
-	switch (size) {
-	case 1:
-		memcpy(&d1, buf, 1);
-		if (put_user(d1, target))
-			goto fault;
-		break;
-	case 2:
-		memcpy(&d2, buf, 2);
-		if (put_user(d2, target))
-			goto fault;
-		break;
-	case 4:
-		memcpy(&d4, buf, 4);
-		if (put_user(d4, target))
-			goto fault;
-		break;
-	case 8:
-		memcpy(&d8, buf, 8);
-		if (put_user(d8, target))
-			goto fault;
-		break;
-	default:
-		WARN_ONCE(1, "%s: Invalid size: %zu\n", __func__, size);
-		return ES_UNSUPPORTED;
-	}
-
-	return ES_OK;
-
-fault:
-	if (user_mode(ctxt->regs))
-		error_code |= X86_PF_USER;
-
-	ctxt->fi.vector = X86_TRAP_PF;
-	ctxt->fi.error_code = error_code;
-	ctxt->fi.cr2 = (unsigned long)dst;
-
-	return ES_EXCEPTION;
-}
-
-static enum es_result vc_read_mem(struct es_em_ctxt *ctxt,
-				  char *src, char *buf, size_t size)
-{
-	unsigned long error_code = X86_PF_PROT;
-	char __user *s = (char __user *)src;
-	u64 d8;
-	u32 d4;
-	u16 d2;
-	u8  d1;
-
-	/* If instruction ran in kernel mode and the I/O buffer is in kernel space */
-	if (!user_mode(ctxt->regs) && !access_ok(s, size)) {
-		memcpy(buf, src, size);
-		return ES_OK;
-	}
-
-	switch (size) {
-	case 1:
-		if (get_user(d1, s))
-			goto fault;
-		memcpy(buf, &d1, 1);
-		break;
-	case 2:
-		if (get_user(d2, s))
-			goto fault;
-		memcpy(buf, &d2, 2);
-		break;
-	case 4:
-		if (get_user(d4, s))
-			goto fault;
-		memcpy(buf, &d4, 4);
-		break;
-	case 8:
-		if (get_user(d8, s))
-			goto fault;
-		memcpy(buf, &d8, 8);
-		break;
-	default:
-		WARN_ONCE(1, "%s: Invalid size: %zu\n", __func__, size);
-		return ES_UNSUPPORTED;
-	}
-
-	return ES_OK;
-
-fault:
-	if (user_mode(ctxt->regs))
-		error_code |= X86_PF_USER;
-
-	ctxt->fi.vector = X86_TRAP_PF;
-	ctxt->fi.error_code = error_code;
-	ctxt->fi.cr2 = (unsigned long)src;
-
-	return ES_EXCEPTION;
-}
-
-static enum es_result vc_slow_virt_to_phys(struct ghcb *ghcb, struct es_em_ctxt *ctxt,
-					   unsigned long vaddr, phys_addr_t *paddr)
-{
-	unsigned long va = (unsigned long)vaddr;
-	unsigned int level;
-	phys_addr_t pa;
-	pgd_t *pgd;
-	pte_t *pte;
-
-	pgd = __va(read_cr3_pa());
-	pgd = &pgd[pgd_index(va)];
-	pte = lookup_address_in_pgd(pgd, va, &level);
-	if (!pte) {
-		ctxt->fi.vector     = X86_TRAP_PF;
-		ctxt->fi.cr2        = vaddr;
-		ctxt->fi.error_code = 0;
-
-		if (user_mode(ctxt->regs))
-			ctxt->fi.error_code |= X86_PF_USER;
-
-		return ES_EXCEPTION;
-	}
-
-	if (WARN_ON_ONCE(pte_val(*pte) & _PAGE_ENC))
-		/* Emulated MMIO to/from encrypted memory not supported */
-		return ES_UNSUPPORTED;
-
-	pa = (phys_addr_t)pte_pfn(*pte) << PAGE_SHIFT;
-	pa |= va & ~page_level_mask(level);
-
-	*paddr = pa;
-
-	return ES_OK;
-}
-
-/* Include code shared with pre-decompression boot stage */
-#include "sev-es-shared.c"
-
-void noinstr __sev_es_nmi_complete(void)
-{
-	struct ghcb_state state;
-	struct ghcb *ghcb;
-
-	ghcb = sev_es_get_ghcb(&state);
-
-	vc_ghcb_invalidate(ghcb);
-	ghcb_set_sw_exit_code(ghcb, SVM_VMGEXIT_NMI_COMPLETE);
-	ghcb_set_sw_exit_info_1(ghcb, 0);
-	ghcb_set_sw_exit_info_2(ghcb, 0);
-
-	sev_es_wr_ghcb_msr(__pa_nodebug(ghcb));
-	VMGEXIT();
-
-	sev_es_put_ghcb(&state);
-}
-
-static u64 get_jump_table_addr(void)
-{
-	struct ghcb_state state;
-	unsigned long flags;
-	struct ghcb *ghcb;
-	u64 ret = 0;
-
-	local_irq_save(flags);
-
-	ghcb = sev_es_get_ghcb(&state);
-
-	vc_ghcb_invalidate(ghcb);
-	ghcb_set_sw_exit_code(ghcb, SVM_VMGEXIT_AP_JUMP_TABLE);
-	ghcb_set_sw_exit_info_1(ghcb, SVM_VMGEXIT_GET_AP_JUMP_TABLE);
-	ghcb_set_sw_exit_info_2(ghcb, 0);
-
-	sev_es_wr_ghcb_msr(__pa(ghcb));
-	VMGEXIT();
-
-	if (ghcb_sw_exit_info_1_is_valid(ghcb) &&
-	    ghcb_sw_exit_info_2_is_valid(ghcb))
-		ret = ghcb->save.sw_exit_info_2;
-
-	sev_es_put_ghcb(&state);
-
-	local_irq_restore(flags);
-
-	return ret;
-}
-
-int sev_es_setup_ap_jump_table(struct real_mode_header *rmh)
-{
-	u16 startup_cs, startup_ip;
-	phys_addr_t jump_table_pa;
-	u64 jump_table_addr;
-	u16 __iomem *jump_table;
-
-	jump_table_addr = get_jump_table_addr();
-
-	/* On UP guests there is no jump table so this is not a failure */
-	if (!jump_table_addr)
-		return 0;
-
-	/* Check if AP Jump Table is page-aligned */
-	if (jump_table_addr & ~PAGE_MASK)
-		return -EINVAL;
-
-	jump_table_pa = jump_table_addr & PAGE_MASK;
-
-	startup_cs = (u16)(rmh->trampoline_start >> 4);
-	startup_ip = (u16)(rmh->sev_es_trampoline_start -
-			   rmh->trampoline_start);
-
-	jump_table = ioremap_encrypted(jump_table_pa, PAGE_SIZE);
-	if (!jump_table)
-		return -EIO;
-
-	writew(startup_ip, &jump_table[0]);
-	writew(startup_cs, &jump_table[1]);
-
-	iounmap(jump_table);
-
-	return 0;
-}
-
-/*
- * This is needed by the OVMF UEFI firmware which will use whatever it finds in
- * the GHCB MSR as its GHCB to talk to the hypervisor. So make sure the per-cpu
- * runtime GHCBs used by the kernel are also mapped in the EFI page-table.
- */
-int __init sev_es_efi_map_ghcbs(pgd_t *pgd)
-{
-	struct sev_es_runtime_data *data;
-	unsigned long address, pflags;
-	int cpu;
-	u64 pfn;
-
-	if (!sev_es_active())
-		return 0;
-
-	pflags = _PAGE_NX | _PAGE_RW;
-
-	for_each_possible_cpu(cpu) {
-		data = per_cpu(runtime_data, cpu);
-
-		address = __pa(&data->ghcb_page);
-		pfn = address >> PAGE_SHIFT;
-
-		if (kernel_map_pages_in_pgd(pgd, pfn, address, 1, pflags))
-			return 1;
-	}
-
-	return 0;
-}
-
-static enum es_result vc_handle_msr(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
-{
-	struct pt_regs *regs = ctxt->regs;
-	enum es_result ret;
-	u64 exit_info_1;
-
-	/* Is it a WRMSR? */
-	exit_info_1 = (ctxt->insn.opcode.bytes[1] == 0x30) ? 1 : 0;
-
-	ghcb_set_rcx(ghcb, regs->cx);
-	if (exit_info_1) {
-		ghcb_set_rax(ghcb, regs->ax);
-		ghcb_set_rdx(ghcb, regs->dx);
-	}
-
-	ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_MSR, exit_info_1, 0);
-
-	if ((ret == ES_OK) && (!exit_info_1)) {
-		regs->ax = ghcb->save.rax;
-		regs->dx = ghcb->save.rdx;
-	}
-
-	return ret;
-}
-
-/*
- * This function runs on the first #VC exception after the kernel
- * switched to virtual addresses.
- */
-static bool __init sev_es_setup_ghcb(void)
-{
-	/* First make sure the hypervisor talks a supported protocol. */
-	if (!sev_es_negotiate_protocol())
-		return false;
-
-	/*
-	 * Clear the boot_ghcb. The first exception comes in before the bss
-	 * section is cleared.
-	 */
-	memset(&boot_ghcb_page, 0, PAGE_SIZE);
-
-	/* Alright - Make the boot-ghcb public */
-	boot_ghcb = &boot_ghcb_page;
-
-	return true;
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-static void sev_es_ap_hlt_loop(void)
-{
-	struct ghcb_state state;
-	struct ghcb *ghcb;
-
-	ghcb = sev_es_get_ghcb(&state);
-
-	while (true) {
-		vc_ghcb_invalidate(ghcb);
-		ghcb_set_sw_exit_code(ghcb, SVM_VMGEXIT_AP_HLT_LOOP);
-		ghcb_set_sw_exit_info_1(ghcb, 0);
-		ghcb_set_sw_exit_info_2(ghcb, 0);
-
-		sev_es_wr_ghcb_msr(__pa(ghcb));
-		VMGEXIT();
-
-		/* Wakeup signal? */
-		if (ghcb_sw_exit_info_2_is_valid(ghcb) &&
-		    ghcb->save.sw_exit_info_2)
-			break;
-	}
-
-	sev_es_put_ghcb(&state);
-}
-
-/*
- * Play_dead handler when running under SEV-ES. This is needed because
- * the hypervisor can't deliver an SIPI request to restart the AP.
- * Instead the kernel has to issue a VMGEXIT to halt the VCPU until the
- * hypervisor wakes it up again.
- */
-static void sev_es_play_dead(void)
-{
-	play_dead_common();
-
-	/* IRQs now disabled */
-
-	sev_es_ap_hlt_loop();
-
-	/*
-	 * If we get here, the VCPU was woken up again. Jump to CPU
-	 * startup code to get it back online.
-	 */
-	start_cpu0();
-}
-#else  /* CONFIG_HOTPLUG_CPU */
-#define sev_es_play_dead	native_play_dead
-#endif /* CONFIG_HOTPLUG_CPU */
-
-#ifdef CONFIG_SMP
-static void __init sev_es_setup_play_dead(void)
-{
-	smp_ops.play_dead = sev_es_play_dead;
-}
-#else
-static inline void sev_es_setup_play_dead(void) { }
-#endif
-
-static void __init alloc_runtime_data(int cpu)
-{
-	struct sev_es_runtime_data *data;
-
-	data = memblock_alloc(sizeof(*data), PAGE_SIZE);
-	if (!data)
-		panic("Can't allocate SEV-ES runtime data");
-
-	per_cpu(runtime_data, cpu) = data;
-}
-
-static void __init init_ghcb(int cpu)
-{
-	struct sev_es_runtime_data *data;
-	int err;
-
-	data = per_cpu(runtime_data, cpu);
-
-	err = early_set_memory_decrypted((unsigned long)&data->ghcb_page,
-					 sizeof(data->ghcb_page));
-	if (err)
-		panic("Can't map GHCBs unencrypted");
-
-	memset(&data->ghcb_page, 0, sizeof(data->ghcb_page));
-
-	data->ghcb_active = false;
-	data->backup_ghcb_active = false;
-}
-
-void __init sev_es_init_vc_handling(void)
-{
-	int cpu;
-
-	BUILD_BUG_ON(offsetof(struct sev_es_runtime_data, ghcb_page) % PAGE_SIZE);
-
-	if (!sev_es_active())
-		return;
-
-	if (!sev_es_check_cpu_features())
-		panic("SEV-ES CPU Features missing");
-
-	/* Enable SEV-ES special handling */
-	static_branch_enable(&sev_es_enable_key);
-
-	/* Initialize per-cpu GHCB pages */
-	for_each_possible_cpu(cpu) {
-		alloc_runtime_data(cpu);
-		init_ghcb(cpu);
-		setup_vc_stacks(cpu);
-	}
-
-	sev_es_setup_play_dead();
-
-	/* Secondary CPUs use the runtime #VC handler */
-	initial_vc_handler = (unsigned long)safe_stack_exc_vmm_communication;
-}
-
-static void __init vc_early_forward_exception(struct es_em_ctxt *ctxt)
-{
-	int trapnr = ctxt->fi.vector;
-
-	if (trapnr == X86_TRAP_PF)
-		native_write_cr2(ctxt->fi.cr2);
-
-	ctxt->regs->orig_ax = ctxt->fi.error_code;
-	do_early_exception(ctxt->regs, trapnr);
-}
-
-static long *vc_insn_get_reg(struct es_em_ctxt *ctxt)
-{
-	long *reg_array;
-	int offset;
-
-	reg_array = (long *)ctxt->regs;
-	offset    = insn_get_modrm_reg_off(&ctxt->insn, ctxt->regs);
-
-	if (offset < 0)
-		return NULL;
-
-	offset /= sizeof(long);
-
-	return reg_array + offset;
-}
-
-static long *vc_insn_get_rm(struct es_em_ctxt *ctxt)
-{
-	long *reg_array;
-	int offset;
-
-	reg_array = (long *)ctxt->regs;
-	offset    = insn_get_modrm_rm_off(&ctxt->insn, ctxt->regs);
-
-	if (offset < 0)
-		return NULL;
-
-	offset /= sizeof(long);
-
-	return reg_array + offset;
-}
-static enum es_result vc_do_mmio(struct ghcb *ghcb, struct es_em_ctxt *ctxt,
-				 unsigned int bytes, bool read)
-{
-	u64 exit_code, exit_info_1, exit_info_2;
-	unsigned long ghcb_pa = __pa(ghcb);
-	enum es_result res;
-	phys_addr_t paddr;
-	void __user *ref;
-
-	ref = insn_get_addr_ref(&ctxt->insn, ctxt->regs);
-	if (ref == (void __user *)-1L)
-		return ES_UNSUPPORTED;
-
-	exit_code = read ? SVM_VMGEXIT_MMIO_READ : SVM_VMGEXIT_MMIO_WRITE;
-
-	res = vc_slow_virt_to_phys(ghcb, ctxt, (unsigned long)ref, &paddr);
-	if (res != ES_OK) {
-		if (res == ES_EXCEPTION && !read)
-			ctxt->fi.error_code |= X86_PF_WRITE;
-
-		return res;
-	}
-
-	exit_info_1 = paddr;
-	/* Can never be greater than 8 */
-	exit_info_2 = bytes;
-
-	ghcb_set_sw_scratch(ghcb, ghcb_pa + offsetof(struct ghcb, shared_buffer));
-
-	return sev_es_ghcb_hv_call(ghcb, ctxt, exit_code, exit_info_1, exit_info_2);
-}
-
-static enum es_result vc_handle_mmio_twobyte_ops(struct ghcb *ghcb,
-						 struct es_em_ctxt *ctxt)
-{
-	struct insn *insn = &ctxt->insn;
-	unsigned int bytes = 0;
-	enum es_result ret;
-	int sign_byte;
-	long *reg_data;
-
-	switch (insn->opcode.bytes[1]) {
-		/* MMIO Read w/ zero-extension */
-	case 0xb6:
-		bytes = 1;
-		fallthrough;
-	case 0xb7:
-		if (!bytes)
-			bytes = 2;
-
-		ret = vc_do_mmio(ghcb, ctxt, bytes, true);
-		if (ret)
-			break;
-
-		/* Zero extend based on operand size */
-		reg_data = vc_insn_get_reg(ctxt);
-		if (!reg_data)
-			return ES_DECODE_FAILED;
-
-		memset(reg_data, 0, insn->opnd_bytes);
-
-		memcpy(reg_data, ghcb->shared_buffer, bytes);
-		break;
-
-		/* MMIO Read w/ sign-extension */
-	case 0xbe:
-		bytes = 1;
-		fallthrough;
-	case 0xbf:
-		if (!bytes)
-			bytes = 2;
-
-		ret = vc_do_mmio(ghcb, ctxt, bytes, true);
-		if (ret)
-			break;
-
-		/* Sign extend based on operand size */
-		reg_data = vc_insn_get_reg(ctxt);
-		if (!reg_data)
-			return ES_DECODE_FAILED;
-
-		if (bytes == 1) {
-			u8 *val = (u8 *)ghcb->shared_buffer;
-
-			sign_byte = (*val & 0x80) ? 0xff : 0x00;
-		} else {
-			u16 *val = (u16 *)ghcb->shared_buffer;
-
-			sign_byte = (*val & 0x8000) ? 0xff : 0x00;
-		}
-		memset(reg_data, sign_byte, insn->opnd_bytes);
-
-		memcpy(reg_data, ghcb->shared_buffer, bytes);
-		break;
-
-	default:
-		ret = ES_UNSUPPORTED;
-	}
-
-	return ret;
-}
-
-/*
- * The MOVS instruction has two memory operands, which raises the
- * problem that it is not known whether the access to the source or the
- * destination caused the #VC exception (and hence whether an MMIO read
- * or write operation needs to be emulated).
- *
- * Instead of playing games with walking page-tables and trying to guess
- * whether the source or destination is an MMIO range, split the move
- * into two operations, a read and a write with only one memory operand.
- * This will cause a nested #VC exception on the MMIO address which can
- * then be handled.
- *
- * This implementation has the benefit that it also supports MOVS where
- * source _and_ destination are MMIO regions.
- *
- * It will slow MOVS on MMIO down a lot, but in SEV-ES guests it is a
- * rare operation. If it turns out to be a performance problem the split
- * operations can be moved to memcpy_fromio() and memcpy_toio().
- */
-static enum es_result vc_handle_mmio_movs(struct es_em_ctxt *ctxt,
-					  unsigned int bytes)
-{
-	unsigned long ds_base, es_base;
-	unsigned char *src, *dst;
-	unsigned char buffer[8];
-	enum es_result ret;
-	bool rep;
-	int off;
-
-	ds_base = insn_get_seg_base(ctxt->regs, INAT_SEG_REG_DS);
-	es_base = insn_get_seg_base(ctxt->regs, INAT_SEG_REG_ES);
-
-	if (ds_base == -1L || es_base == -1L) {
-		ctxt->fi.vector = X86_TRAP_GP;
-		ctxt->fi.error_code = 0;
-		return ES_EXCEPTION;
-	}
-
-	src = ds_base + (unsigned char *)ctxt->regs->si;
-	dst = es_base + (unsigned char *)ctxt->regs->di;
-
-	ret = vc_read_mem(ctxt, src, buffer, bytes);
-	if (ret != ES_OK)
-		return ret;
-
-	ret = vc_write_mem(ctxt, dst, buffer, bytes);
-	if (ret != ES_OK)
-		return ret;
-
-	if (ctxt->regs->flags & X86_EFLAGS_DF)
-		off = -bytes;
-	else
-		off =  bytes;
-
-	ctxt->regs->si += off;
-	ctxt->regs->di += off;
-
-	rep = insn_has_rep_prefix(&ctxt->insn);
-	if (rep)
-		ctxt->regs->cx -= 1;
-
-	if (!rep || ctxt->regs->cx == 0)
-		return ES_OK;
-	else
-		return ES_RETRY;
-}
-
-static enum es_result vc_handle_mmio(struct ghcb *ghcb,
-				     struct es_em_ctxt *ctxt)
-{
-	struct insn *insn = &ctxt->insn;
-	unsigned int bytes = 0;
-	enum es_result ret;
-	long *reg_data;
-
-	switch (insn->opcode.bytes[0]) {
-	/* MMIO Write */
-	case 0x88:
-		bytes = 1;
-		fallthrough;
-	case 0x89:
-		if (!bytes)
-			bytes = insn->opnd_bytes;
-
-		reg_data = vc_insn_get_reg(ctxt);
-		if (!reg_data)
-			return ES_DECODE_FAILED;
-
-		memcpy(ghcb->shared_buffer, reg_data, bytes);
-
-		ret = vc_do_mmio(ghcb, ctxt, bytes, false);
-		break;
-
-	case 0xc6:
-		bytes = 1;
-		fallthrough;
-	case 0xc7:
-		if (!bytes)
-			bytes = insn->opnd_bytes;
-
-		memcpy(ghcb->shared_buffer, insn->immediate1.bytes, bytes);
-
-		ret = vc_do_mmio(ghcb, ctxt, bytes, false);
-		break;
-
-		/* MMIO Read */
-	case 0x8a:
-		bytes = 1;
-		fallthrough;
-	case 0x8b:
-		if (!bytes)
-			bytes = insn->opnd_bytes;
-
-		ret = vc_do_mmio(ghcb, ctxt, bytes, true);
-		if (ret)
-			break;
-
-		reg_data = vc_insn_get_reg(ctxt);
-		if (!reg_data)
-			return ES_DECODE_FAILED;
-
-		/* Zero-extend for 32-bit operation */
-		if (bytes == 4)
-			*reg_data = 0;
-
-		memcpy(reg_data, ghcb->shared_buffer, bytes);
-		break;
-
-		/* MOVS instruction */
-	case 0xa4:
-		bytes = 1;
-		fallthrough;
-	case 0xa5:
-		if (!bytes)
-			bytes = insn->opnd_bytes;
-
-		ret = vc_handle_mmio_movs(ctxt, bytes);
-		break;
-		/* Two-Byte Opcodes */
-	case 0x0f:
-		ret = vc_handle_mmio_twobyte_ops(ghcb, ctxt);
-		break;
-	default:
-		ret = ES_UNSUPPORTED;
-	}
-
-	return ret;
-}
-
-static enum es_result vc_handle_dr7_write(struct ghcb *ghcb,
-					  struct es_em_ctxt *ctxt)
-{
-	struct sev_es_runtime_data *data = this_cpu_read(runtime_data);
-	long val, *reg = vc_insn_get_rm(ctxt);
-	enum es_result ret;
-
-	if (!reg)
-		return ES_DECODE_FAILED;
-
-	val = *reg;
-
-	/* Upper 32 bits must be written as zeroes */
-	if (val >> 32) {
-		ctxt->fi.vector = X86_TRAP_GP;
-		ctxt->fi.error_code = 0;
-		return ES_EXCEPTION;
-	}
-
-	/* Clear out other reserved bits and set bit 10 */
-	val = (val & 0xffff23ffL) | BIT(10);
-
-	/* Early non-zero writes to DR7 are not supported */
-	if (!data && (val & ~DR7_RESET_VALUE))
-		return ES_UNSUPPORTED;
-
-	/* Using a value of 0 for ExitInfo1 means RAX holds the value */
-	ghcb_set_rax(ghcb, val);
-	ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_WRITE_DR7, 0, 0);
-	if (ret != ES_OK)
-		return ret;
-
-	if (data)
-		data->dr7 = val;
-
-	return ES_OK;
-}
-
-static enum es_result vc_handle_dr7_read(struct ghcb *ghcb,
-					 struct es_em_ctxt *ctxt)
-{
-	struct sev_es_runtime_data *data = this_cpu_read(runtime_data);
-	long *reg = vc_insn_get_rm(ctxt);
-
-	if (!reg)
-		return ES_DECODE_FAILED;
-
-	if (data)
-		*reg = data->dr7;
-	else
-		*reg = DR7_RESET_VALUE;
-
-	return ES_OK;
-}
-
-static enum es_result vc_handle_wbinvd(struct ghcb *ghcb,
-				       struct es_em_ctxt *ctxt)
-{
-	return sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_WBINVD, 0, 0);
-}
-
-static enum es_result vc_handle_rdpmc(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
-{
-	enum es_result ret;
-
-	ghcb_set_rcx(ghcb, ctxt->regs->cx);
-
-	ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_RDPMC, 0, 0);
-	if (ret != ES_OK)
-		return ret;
-
-	if (!(ghcb_rax_is_valid(ghcb) && ghcb_rdx_is_valid(ghcb)))
-		return ES_VMM_ERROR;
-
-	ctxt->regs->ax = ghcb->save.rax;
-	ctxt->regs->dx = ghcb->save.rdx;
-
-	return ES_OK;
-}
-
-static enum es_result vc_handle_monitor(struct ghcb *ghcb,
-					struct es_em_ctxt *ctxt)
-{
-	/*
-	 * Treat it as a NOP and do not leak a physical address to the
-	 * hypervisor.
-	 */
-	return ES_OK;
-}
-
-static enum es_result vc_handle_mwait(struct ghcb *ghcb,
-				      struct es_em_ctxt *ctxt)
-{
-	/* Treat the same as MONITOR/MONITORX */
-	return ES_OK;
-}
-
-static enum es_result vc_handle_vmmcall(struct ghcb *ghcb,
-					struct es_em_ctxt *ctxt)
-{
-	enum es_result ret;
-
-	ghcb_set_rax(ghcb, ctxt->regs->ax);
-	ghcb_set_cpl(ghcb, user_mode(ctxt->regs) ? 3 : 0);
-
-	if (x86_platform.hyper.sev_es_hcall_prepare)
-		x86_platform.hyper.sev_es_hcall_prepare(ghcb, ctxt->regs);
-
-	ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_VMMCALL, 0, 0);
-	if (ret != ES_OK)
-		return ret;
-
-	if (!ghcb_rax_is_valid(ghcb))
-		return ES_VMM_ERROR;
-
-	ctxt->regs->ax = ghcb->save.rax;
-
-	/*
-	 * Call sev_es_hcall_finish() after regs->ax is already set.
-	 * This allows the hypervisor handler to overwrite it again if
-	 * necessary.
-	 */
-	if (x86_platform.hyper.sev_es_hcall_finish &&
-	    !x86_platform.hyper.sev_es_hcall_finish(ghcb, ctxt->regs))
-		return ES_VMM_ERROR;
-
-	return ES_OK;
-}
-
-static enum es_result vc_handle_trap_ac(struct ghcb *ghcb,
-					struct es_em_ctxt *ctxt)
-{
-	/*
-	 * Calling ecx_alignment_check() directly does not work, because it
-	 * enables IRQs and the GHCB is active. Forward the exception and call
-	 * it later from vc_forward_exception().
-	 */
-	ctxt->fi.vector = X86_TRAP_AC;
-	ctxt->fi.error_code = 0;
-	return ES_EXCEPTION;
-}
-
-static __always_inline void vc_handle_trap_db(struct pt_regs *regs)
-{
-	if (user_mode(regs))
-		noist_exc_debug(regs);
-	else
-		exc_debug(regs);
-}
-
-static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,
-					 struct ghcb *ghcb,
-					 unsigned long exit_code)
-{
-	enum es_result result;
-
-	switch (exit_code) {
-	case SVM_EXIT_READ_DR7:
-		result = vc_handle_dr7_read(ghcb, ctxt);
-		break;
-	case SVM_EXIT_WRITE_DR7:
-		result = vc_handle_dr7_write(ghcb, ctxt);
-		break;
-	case SVM_EXIT_EXCP_BASE + X86_TRAP_AC:
-		result = vc_handle_trap_ac(ghcb, ctxt);
-		break;
-	case SVM_EXIT_RDTSC:
-	case SVM_EXIT_RDTSCP:
-		result = vc_handle_rdtsc(ghcb, ctxt, exit_code);
-		break;
-	case SVM_EXIT_RDPMC:
-		result = vc_handle_rdpmc(ghcb, ctxt);
-		break;
-	case SVM_EXIT_INVD:
-		pr_err_ratelimited("#VC exception for INVD??? Seriously???\n");
-		result = ES_UNSUPPORTED;
-		break;
-	case SVM_EXIT_CPUID:
-		result = vc_handle_cpuid(ghcb, ctxt);
-		break;
-	case SVM_EXIT_IOIO:
-		result = vc_handle_ioio(ghcb, ctxt);
-		break;
-	case SVM_EXIT_MSR:
-		result = vc_handle_msr(ghcb, ctxt);
-		break;
-	case SVM_EXIT_VMMCALL:
-		result = vc_handle_vmmcall(ghcb, ctxt);
-		break;
-	case SVM_EXIT_WBINVD:
-		result = vc_handle_wbinvd(ghcb, ctxt);
-		break;
-	case SVM_EXIT_MONITOR:
-		result = vc_handle_monitor(ghcb, ctxt);
-		break;
-	case SVM_EXIT_MWAIT:
-		result = vc_handle_mwait(ghcb, ctxt);
-		break;
-	case SVM_EXIT_NPF:
-		result = vc_handle_mmio(ghcb, ctxt);
-		break;
-	default:
-		/*
-		 * Unexpected #VC exception
-		 */
-		result = ES_UNSUPPORTED;
-	}
-
-	return result;
-}
-
-static __always_inline void vc_forward_exception(struct es_em_ctxt *ctxt)
-{
-	long error_code = ctxt->fi.error_code;
-	int trapnr = ctxt->fi.vector;
-
-	ctxt->regs->orig_ax = ctxt->fi.error_code;
-
-	switch (trapnr) {
-	case X86_TRAP_GP:
-		exc_general_protection(ctxt->regs, error_code);
-		break;
-	case X86_TRAP_UD:
-		exc_invalid_op(ctxt->regs);
-		break;
-	case X86_TRAP_AC:
-		exc_alignment_check(ctxt->regs, error_code);
-		break;
-	default:
-		pr_emerg("Unsupported exception in #VC instruction emulation - can't continue\n");
-		BUG();
-	}
-}
-
-static __always_inline bool on_vc_fallback_stack(struct pt_regs *regs)
-{
-	unsigned long sp = (unsigned long)regs;
-
-	return (sp >= __this_cpu_ist_bottom_va(VC2) && sp < __this_cpu_ist_top_va(VC2));
-}
-
-/*
- * Main #VC exception handler. It is called when the entry code was able to
- * switch off the IST to a safe kernel stack.
- *
- * With the current implementation it is always possible to switch to a safe
- * stack because #VC exceptions only happen at known places, like intercepted
- * instructions or accesses to MMIO areas/IO ports. They can also happen with
- * code instrumentation when the hypervisor intercepts #DB, but the critical
- * paths are forbidden to be instrumented, so #DB exceptions currently also
- * only happen in safe places.
- */
-DEFINE_IDTENTRY_VC_SAFE_STACK(exc_vmm_communication)
-{
-	struct sev_es_runtime_data *data = this_cpu_read(runtime_data);
-	irqentry_state_t irq_state;
-	struct ghcb_state state;
-	struct es_em_ctxt ctxt;
-	enum es_result result;
-	struct ghcb *ghcb;
-
-	/*
-	 * Handle #DB before calling into !noinstr code to avoid recursive #DB.
-	 */
-	if (error_code == SVM_EXIT_EXCP_BASE + X86_TRAP_DB) {
-		vc_handle_trap_db(regs);
-		return;
-	}
-
-	irq_state = irqentry_nmi_enter(regs);
-	lockdep_assert_irqs_disabled();
-	instrumentation_begin();
-
-	/*
-	 * This is invoked through an interrupt gate, so IRQs are disabled. The
-	 * code below might walk page-tables for user or kernel addresses, so
-	 * keep the IRQs disabled to protect us against concurrent TLB flushes.
-	 */
-
-	ghcb = sev_es_get_ghcb(&state);
-	if (!ghcb) {
-		/*
-		 * Mark GHCBs inactive so that panic() is able to print the
-		 * message.
-		 */
-		data->ghcb_active        = false;
-		data->backup_ghcb_active = false;
-
-		panic("Unable to handle #VC exception! GHCB and Backup GHCB are already in use");
-	}
-
-	vc_ghcb_invalidate(ghcb);
-	result = vc_init_em_ctxt(&ctxt, regs, error_code);
-
-	if (result == ES_OK)
-		result = vc_handle_exitcode(&ctxt, ghcb, error_code);
-
-	sev_es_put_ghcb(&state);
-
-	/* Done - now check the result */
-	switch (result) {
-	case ES_OK:
-		vc_finish_insn(&ctxt);
-		break;
-	case ES_UNSUPPORTED:
-		pr_err_ratelimited("Unsupported exit-code 0x%02lx in early #VC exception (IP: 0x%lx)\n",
-				   error_code, regs->ip);
-		goto fail;
-	case ES_VMM_ERROR:
-		pr_err_ratelimited("Failure in communication with VMM (exit-code 0x%02lx IP: 0x%lx)\n",
-				   error_code, regs->ip);
-		goto fail;
-	case ES_DECODE_FAILED:
-		pr_err_ratelimited("Failed to decode instruction (exit-code 0x%02lx IP: 0x%lx)\n",
-				   error_code, regs->ip);
-		goto fail;
-	case ES_EXCEPTION:
-		vc_forward_exception(&ctxt);
-		break;
-	case ES_RETRY:
-		/* Nothing to do */
-		break;
-	default:
-		pr_emerg("Unknown result in %s():%d\n", __func__, result);
-		/*
-		 * Emulating the instruction which caused the #VC exception
-		 * failed - can't continue so print debug information
-		 */
-		BUG();
-	}
-
-out:
-	instrumentation_end();
-	irqentry_nmi_exit(regs, irq_state);
-
-	return;
-
-fail:
-	if (user_mode(regs)) {
-		/*
-		 * Do not kill the machine if user-space triggered the
-		 * exception. Send SIGBUS instead and let user-space deal with
-		 * it.
-		 */
-		force_sig_fault(SIGBUS, BUS_OBJERR, (void __user *)0);
-	} else {
-		pr_emerg("PANIC: Unhandled #VC exception in kernel space (result=%d)\n",
-			 result);
-
-		/* Show some debug info */
-		show_regs(regs);
-
-		/* Ask hypervisor to sev_es_terminate */
-		sev_es_terminate(GHCB_SEV_ES_REASON_GENERAL_REQUEST);
-
-		/* If that fails and we get here - just panic */
-		panic("Returned from Terminate-Request to Hypervisor\n");
-	}
-
-	goto out;
-}
-
-/* This handler runs on the #VC fall-back stack. It can cause further #VC exceptions */
-DEFINE_IDTENTRY_VC_IST(exc_vmm_communication)
-{
-	instrumentation_begin();
-	panic("Can't handle #VC exception from unsupported context\n");
-	instrumentation_end();
-}
-
-DEFINE_IDTENTRY_VC(exc_vmm_communication)
-{
-	if (likely(!on_vc_fallback_stack(regs)))
-		safe_stack_exc_vmm_communication(regs, error_code);
-	else
-		ist_exc_vmm_communication(regs, error_code);
-}
-
-bool __init handle_vc_boot_ghcb(struct pt_regs *regs)
-{
-	unsigned long exit_code = regs->orig_ax;
-	struct es_em_ctxt ctxt;
-	enum es_result result;
-
-	/* Do initial setup or terminate the guest */
-	if (unlikely(boot_ghcb == NULL && !sev_es_setup_ghcb()))
-		sev_es_terminate(GHCB_SEV_ES_REASON_GENERAL_REQUEST);
-
-	vc_ghcb_invalidate(boot_ghcb);
-
-	result = vc_init_em_ctxt(&ctxt, regs, exit_code);
-	if (result == ES_OK)
-		result = vc_handle_exitcode(&ctxt, boot_ghcb, exit_code);
-
-	/* Done - now check the result */
-	switch (result) {
-	case ES_OK:
-		vc_finish_insn(&ctxt);
-		break;
-	case ES_UNSUPPORTED:
-		early_printk("PANIC: Unsupported exit-code 0x%02lx in early #VC exception (IP: 0x%lx)\n",
-				exit_code, regs->ip);
-		goto fail;
-	case ES_VMM_ERROR:
-		early_printk("PANIC: Failure in communication with VMM (exit-code 0x%02lx IP: 0x%lx)\n",
-				exit_code, regs->ip);
-		goto fail;
-	case ES_DECODE_FAILED:
-		early_printk("PANIC: Failed to decode instruction (exit-code 0x%02lx IP: 0x%lx)\n",
-				exit_code, regs->ip);
-		goto fail;
-	case ES_EXCEPTION:
-		vc_early_forward_exception(&ctxt);
-		break;
-	case ES_RETRY:
-		/* Nothing to do */
-		break;
-	default:
-		BUG();
-	}
-
-	return true;
-
-fail:
-	show_regs(regs);
-
-	while (true)
-		halt();
-}