diff options
| author | Avi Kivity <avi@redhat.com> | 2012-06-07 17:06:10 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-07-09 14:19:01 +0300 |
| commit | f0495f9b9992f80f82b14306946444b287193390 (patch) | |
| tree | 407c142b0b1ac05c28962143ef3253b34d9f912c /arch/x86/kvm | |
| parent | 510425ff3344df03a1f94bce49e659ae302e0d34 (diff) | |
KVM: VMX: Relax check on unusable segment
Some userspace (e.g. QEMU 1.1) munge the d and g bits of segment
descriptors, causing us not to recognize them as unusable segments
with emulate_invalid_guest_state=1. Relax the check by testing for
segment not present (a non-present segment cannot be usable).
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 486db2f9561b..82ab1fb2683e 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -3198,7 +3198,7 @@ static u32 vmx_segment_access_rights(struct kvm_segment *var) { u32 ar; - if (var->unusable) + if (var->unusable || !var->present) ar = 1 << 16; else { ar = var->type & 15; @@ -3210,8 +3210,6 @@ static u32 vmx_segment_access_rights(struct kvm_segment *var) ar |= (var->db & 1) << 14; ar |= (var->g & 1) << 15; } - if (ar == 0) /* a 0 value means unusable */ - ar = AR_UNUSABLE_MASK; return ar; } |