Commit 7fe864dc942c ("KVM: x86: Emulator considers imm as memory operand")
marked VEX instructions as such in protected mode. VEX-prefix instructions are
not supported relevant on real-mode and VM86, but should cause #UD instead of
being decoded as LES/LDS.
Fix this behaviour to be consistent with real hardware.
Signed-off-by: Nadav Amit <namit@xxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/emulate.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index db8cb4d6..24b0df7 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -4505,8 +4505,7 @@ done_prefixes:
/* vex-prefix instructions are not implemented */
if (ctxt->opcode_len == 1 && (ctxt->b == 0xc5 || ctxt->b == 0xc4) &&
- (mode == X86EMUL_MODE_PROT64 ||
- (mode >= X86EMUL_MODE_PROT16 && (ctxt->modrm & 0x80)))) {
+ (mode == X86EMUL_MODE_PROT64 || (ctxt->modrm & 0x80))) {
ctxt->d = NotImpl;
}
--
1.9.1
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