From: Avi Kivity Date: Tue, 21 Aug 2012 14:07:08 +0000 (+0300) Subject: KVM: VMX: Preserve segment limit and access rights in real mode X-Git-Tag: firefly_0821_release~3680^2~1917^2~29 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=1390a28b274e2e45f89bac67c435cbcbc5cc0790;p=firefly-linux-kernel-4.4.55.git KVM: VMX: Preserve segment limit and access rights in real mode While this is undocumented, real processors do not reload the segment limit and access rights when loading a segment register in real mode. Real programs rely on it so we need to comply with this behaviour. Signed-off-by: Avi Kivity Signed-off-by: Marcelo Tosatti --- diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 0d6872621ab5..6e6421aeca03 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -3113,6 +3113,9 @@ static void vmx_get_segment(struct kvm_vcpu *vcpu, if (seg == VCPU_SREG_TR || var->selector == vmx_read_guest_seg_selector(vmx, seg)) return; + var->base = vmx_read_guest_seg_base(vmx, seg); + var->selector = vmx_read_guest_seg_selector(vmx, seg); + return; } var->base = vmx_read_guest_seg_base(vmx, seg); var->limit = vmx_read_guest_seg_limit(vmx, seg);