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    Subject[PATCH 26/38] KVM: mark segments accessed on HW task switch
    Date
    From: Gleb Natapov <gleb@redhat.com>

    On HW task switch newly loaded segments should me marked as accessed.

    Reported-by: Lorenzo Martignoni <martignlo@gmail.com>
    Signed-off-by: Gleb Natapov <gleb@redhat.com>
    Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
    ---
    arch/x86/kvm/x86.c | 22 +++++++++-------------
    1 files 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;
    }

    --
    1.6.5.3


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