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KVM: VMX: relax check for CS register in rmode_segment_valid()

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rmode_segment_valid() checks if segment descriptor can be used to enter
vm86 mode. VMX spec mandates that in vm86 mode CS register will be of
type data, not code. Lets allow guest entry with vm86 mode if the only
problem with CS register is incorrect type. Otherwise entire real mode
will be emulated.

Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Gleb Natapov 2012-12-12 19:10:50 +02:00
parent 07f42f5f25
commit 0647f4aa8c
1 changed files with 2 additions and 0 deletions
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2
arch/x86/kvm/vmx.c
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@ -3383,6 +3383,8 @@ static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg)
var.dpl = 0x3;
var.g = 0;
var.db = 0;
if (seg == VCPU_SREG_CS)
var.type = 0x3;
ar = vmx_segment_access_rights(&var);
if (var.base != (var.selector << 4))