KVM: Load real mode segments correctly
Real mode segments to not reference the GDT or LDT; they simply compute base = selector * 16. Signed-off-by: Avi Kivity <avi@qumranet.com>
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@ -3588,11 +3588,33 @@ static int load_segment_descriptor_to_kvm_desct(struct kvm_vcpu *vcpu,
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return 0;
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return 0;
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}
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}
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int kvm_load_realmode_segment(struct kvm_vcpu *vcpu, u16 selector, int seg)
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{
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struct kvm_segment segvar = {
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.base = selector << 4,
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.limit = 0xffff,
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.selector = selector,
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.type = 3,
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.present = 1,
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.dpl = 3,
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.db = 0,
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.s = 1,
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.l = 0,
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.g = 0,
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.avl = 0,
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.unusable = 0,
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};
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kvm_x86_ops->set_segment(vcpu, &segvar, seg);
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return 0;
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}
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int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
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int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
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int type_bits, int seg)
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int type_bits, int seg)
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{
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{
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struct kvm_segment kvm_seg;
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struct kvm_segment kvm_seg;
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if (!(vcpu->arch.cr0 & X86_CR0_PE))
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return kvm_load_realmode_segment(vcpu, selector, seg);
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if (load_segment_descriptor_to_kvm_desct(vcpu, selector, &kvm_seg))
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if (load_segment_descriptor_to_kvm_desct(vcpu, selector, &kvm_seg))
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return 1;
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return 1;
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kvm_seg.type |= type_bits;
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kvm_seg.type |= type_bits;
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