diff options
| author | Glauber Costa <glommer@redhat.com> | 2009-05-12 16:21:06 -0400 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-06-10 11:48:54 +0300 |
| commit | 310b5d306c1aee7ebe32f702c0e33e7988d50646 (patch) | |
| tree | 101bb4c72f1bb3eb3d4f60406435703f538c0ced /arch/x86/kvm/x86.c | |
| parent | 2809f5d2c4cfad171167b131bb2a21ab65eba40f (diff) | |
KVM: Deal with interrupt shadow state for emulated instructions
We currently unblock shadow interrupt state when we skip an instruction,
but failing to do so when we actually emulate one. This blocks interrupts
in key instruction blocks, in particular sti; hlt; sequences
If the instruction emulated is an sti, we have to block shadow interrupts.
The same goes for mov ss. pop ss also needs it, but we don't currently
emulate it.
Without this patch, I cannot boot gpxe option roms at vmx machines.
This is described at https://bugzilla.redhat.com/show_bug.cgi?id=494469
Signed-off-by: Glauber Costa <glommer@redhat.com>
CC: H. Peter Anvin <hpa@zytor.com>
CC: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 7475b029b2a..48f744ff0bc 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2379,7 +2379,7 @@ int emulate_instruction(struct kvm_vcpu *vcpu, u16 error_code, int emulation_type) { - int r; + int r, shadow_mask; struct decode_cache *c; kvm_clear_exception_queue(vcpu); @@ -2433,6 +2433,10 @@ int emulate_instruction(struct kvm_vcpu *vcpu, } r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops); + shadow_mask = vcpu->arch.emulate_ctxt.interruptibility; + + if (r == 0) + kvm_x86_ops->set_interrupt_shadow(vcpu, shadow_mask); if (vcpu->arch.pio.string) return EMULATE_DO_MMIO; |