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| author |   Avi Kivity <avi@qumranet.com> | 2008-08-20 15:51:42 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-10-15 10:15:21 +0200 |
| commit | f4bbd9aaaae23007e4d79536d35a30cbbb11d407 (patch) | |
| tree | 95d1624fb9847b246a806ddedca38d00de08f56d /arch/x86/kvm/x86.c | |
| parent | KVM: VMX: Change segment dpl at reset to 3 (diff) | |
| download | linux-dev-f4bbd9aaaae23007e4d79536d35a30cbbb11d407.tar.xz linux-dev-f4bbd9aaaae23007e4d79536d35a30cbbb11d407.zip | |
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>
Diffstat (limited to '')
| -rw-r--r-- | arch/x86/kvm/x86.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 22edd95712ee..bfc7c332c5d7 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3588,11 +3588,33 @@ static int load_segment_descriptor_to_kvm_desct(struct kvm_vcpu *vcpu, return 0; } +int kvm_load_realmode_segment(struct kvm_vcpu *vcpu, u16 selector, int seg) +{ + struct kvm_segment segvar = { + .base = selector << 4, + .limit = 0xffff, + .selector = selector, + .type = 3, + .present = 1, + .dpl = 3, + .db = 0, + .s = 1, + .l = 0, + .g = 0, + .avl = 0, + .unusable = 0, + }; + kvm_x86_ops->set_segment(vcpu, &segvar, seg); + return 0; +} + int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, int type_bits, int seg) { struct kvm_segment kvm_seg; + if (!(vcpu->arch.cr0 & X86_CR0_PE)) + return kvm_load_realmode_segment(vcpu, selector, seg); if (load_segment_descriptor_to_kvm_desct(vcpu, selector, &kvm_seg)) return 1; kvm_seg.type |= type_bits; |