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| author | Marcelo Tosatti <mtosatti@redhat.com> | 2009-11-11 20:29:49 +0100 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2010-03-01 16:35:38 +0100 |
| commit | cb84b55f6cde26c7c17beaf87da08645ae6ccbf9 (patch) | |
| tree | b40670344a303d3cfda44eff6c6816d561cc6c36 | |
| parent | KVM: x86: make double/triple fault promotion generic to all exceptions (diff) | |
| download | linux-cb84b55f6cde26c7c17beaf87da08645ae6ccbf9.tar.xz linux-cb84b55f6cde26c7c17beaf87da08645ae6ccbf9.zip | |
KVM: x86: raise TSS exception for NULL CS and SS segments
Windows 2003 uses task switch to triple fault and reboot (the other
exception being reserved pdptrs bits).
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
| -rw-r--r-- | arch/x86/kvm/x86.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 8d860e0301a0..279318677911 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4410,6 +4410,15 @@ static int is_vm86_segment(struct kvm_vcpu *vcpu, int seg) (kvm_get_rflags(vcpu) & X86_EFLAGS_VM); } +static void kvm_check_segment_descriptor(struct kvm_vcpu *vcpu, int seg, + u16 selector) +{ + /* NULL selector is not valid for CS and SS */ + if (seg == VCPU_SREG_CS || seg == VCPU_SREG_SS) + if (!selector) + kvm_queue_exception_e(vcpu, TS_VECTOR, selector >> 3); +} + int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, int type_bits, int seg) { @@ -4419,6 +4428,8 @@ int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, return kvm_load_realmode_segment(vcpu, selector, seg); if (load_segment_descriptor_to_kvm_desct(vcpu, selector, &kvm_seg)) return 1; + + kvm_check_segment_descriptor(vcpu, seg, selector); kvm_seg.type |= type_bits; if (seg != VCPU_SREG_SS && seg != VCPU_SREG_CS && |