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Commit 42bf549f authored Apr 18, 2014 by Nadav Amit Committed by Marcelo Tosatti Apr 23, 2014

KVM: x86: Processor mode may be determined incorrectly



If EFER.LMA is off, cs.l does not determine execution mode.
Currently, the emulation engine assumes differently.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

parent e6e39f04

arch/x86/kvm/x86.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -4888,7 +4888,7 @@ static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
		ctxt->eip = kvm_rip_read(vcpu);
		ctxt->mode = (!is_protmode(vcpu)) ? X86EMUL_MODE_REAL :
		(ctxt->eflags & X86_EFLAGS_VM) ? X86EMUL_MODE_VM86 :
		cs_l ? X86EMUL_MODE_PROT64 :
		(cs_l && is_long_mode(vcpu)) ? X86EMUL_MODE_PROT64 :
		cs_db ? X86EMUL_MODE_PROT32 :
		X86EMUL_MODE_PROT16;
		ctxt->guest_mode = is_guest_mode(vcpu);