From c865c43de66dc973865bda337022f03b6e16c8df Mon Sep 17 00:00:00 2001
From: Avi Kivity <avi@redhat.com>
Date: Tue, 21 Aug 2012 17:07:01 +0300
Subject: [PATCH] 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>
---
arch/x86/kvm/vmx.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 7e95ff68b9daa..88eeb405560f4 100644
--- 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)