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

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>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 7e95ff6..88eeb40 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -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)
 {
        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) {
-               vmx_set_segment(vcpu, save, seg);
-       } else {
-               u32 dpl = (vmcs_read16(sf->selector) & SELECTOR_RPL_MASK)
-                       << AR_DPL_SHIFT;
-               vmcs_write32(sf->ar_bytes, 0x93 | dpl);
+       if (!(vmcs_readl(sf->base) == tmp.base && tmp.s)) {
+               tmp.base = vmcs_readl(sf->base);
+               tmp.selector = vmcs_read16(sf->selector);
+               tmp.s = 1;
        }
+       vmx_set_segment(vcpu, &tmp, seg);
 }
 
 static void enter_pmode(struct kvm_vcpu *vcpu)