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KVM: VMX: Retain limit and attributes when entering protected mode

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Real processors don't change segment limits and attributes while in
real mode.  Mimic that behaviour.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Avi Kivity 2012-08-21 17:07:01 +03:00 committed by Marcelo Tosatti
parent f5f7b2fe3b
commit c865c43de6
1 changed files with 6 additions and 6 deletions
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12
arch/x86/kvm/vmx.c
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@ -2696,14 +2696,14 @@ static __exit void hardware_unsetup(void)
static void fix_pmode_dataseg(struct kvm_vcpu *vcpu, int seg, struct kvm_segment *save) static void fix_pmode_dataseg(struct kvm_vcpu *vcpu, int seg, struct kvm_segment *save)
{ {
struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
struct kvm_segment tmp = *save;
if (vmcs_readl(sf->base) == save->base && save->s) { if (!(vmcs_readl(sf->base) == tmp.base && tmp.s)) {
vmx_set_segment(vcpu, save, seg); tmp.base = vmcs_readl(sf->base);
} else { tmp.selector = vmcs_read16(sf->selector);
u32 dpl = (vmcs_read16(sf->selector) & SELECTOR_RPL_MASK) tmp.s = 1;
<< AR_DPL_SHIFT;
vmcs_write32(sf->ar_bytes, 0x93 | dpl);
} }
vmx_set_segment(vcpu, &tmp, seg);
} }
static void enter_pmode(struct kvm_vcpu *vcpu) static void enter_pmode(struct kvm_vcpu *vcpu)