From e01c2426149d70dc6dd46ad0453195656b6eeaa4 Mon Sep 17 00:00:00 2001 From: Gleb Natapov Date: Mon, 25 Jan 2010 12:01:04 +0200 Subject: [PATCH] KVM: mark segments accessed on HW task switch On HW task switch newly loaded segments should me marked as accessed. Reported-by: Lorenzo Martignoni Signed-off-by: Gleb Natapov Signed-off-by: Marcelo Tosatti --- arch/x86/kvm/x86.c | 22 +++++++++------------- 1 file changed, 9 insertions(+), 13 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 3b90298..d47ceda 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4697,18 +4697,6 @@ static u16 get_segment_selector(struct kvm_vcpu *vcpu, int seg) return kvm_seg.selector; } -static int load_segment_descriptor_to_kvm_desct(struct kvm_vcpu *vcpu, - u16 selector, - struct kvm_segment *kvm_seg) -{ - struct desc_struct seg_desc; - - if (load_guest_segment_descriptor(vcpu, selector, &seg_desc)) - return 1; - seg_desct_to_kvm_desct(&seg_desc, selector, kvm_seg); - return 0; -} - static int kvm_load_realmode_segment(struct kvm_vcpu *vcpu, u16 selector, int seg) { struct kvm_segment segvar = { @@ -4749,11 +4737,14 @@ int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, int type_bits, int seg) { struct kvm_segment kvm_seg; + struct desc_struct seg_desc; if (is_vm86_segment(vcpu, seg) || !is_protmode(vcpu)) return kvm_load_realmode_segment(vcpu, selector, seg); - if (load_segment_descriptor_to_kvm_desct(vcpu, selector, &kvm_seg)) + + if (load_guest_segment_descriptor(vcpu, selector, &seg_desc)) return 1; + seg_desct_to_kvm_desct(&seg_desc, selector, &kvm_seg); kvm_check_segment_descriptor(vcpu, seg, selector); kvm_seg.type |= type_bits; @@ -4764,6 +4755,11 @@ int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, kvm_seg.unusable = 1; kvm_set_segment(vcpu, &kvm_seg, seg); + if (selector && !kvm_seg.unusable && kvm_seg.s) { + /* mark segment as accessed */ + seg_desc.type |= 1; + save_guest_segment_descriptor(vcpu, selector, &seg_desc); + } return 0; } -- 2.7.4