From c865c43de66dc973865bda337022f03b6e16c8df Mon Sep 17 00:00:00 2001 From: Avi Kivity 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 Signed-off-by: Marcelo Tosatti --- 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)