diff options
| author | Gleb Natapov <gleb@redhat.com> | 2012-12-10 16:05:55 +0400 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2012-12-14 05:05:21 +0400 |
| commit | f3200d00ea42e485772ff92d6d649aa8eeb640c0 (patch) | |
| tree | 78324a59e921b1d3f1ed48bbdc6f1bf7fb96f147 /arch/x86/kvm/i8259.c | |
| parent | 5e2c688351f4aee9981918661b6c1679f4155f06 (diff) | |
| download | linux-f3200d00ea42e485772ff92d6d649aa8eeb640c0.tar.xz | |
KVM: inject ExtINT interrupt before APIC interrupts
According to Intel SDM Volume 3 Section 10.8.1 "Interrupt Handling with
the Pentium 4 and Intel Xeon Processors" and Section 10.8.2 "Interrupt
Handling with the P6 Family and Pentium Processors" ExtINT interrupts are
sent directly to the processor core for handling. Currently KVM checks
APIC before it considers ExtINT interrupts for injection which is
backwards from the spec. Make code behave according to the SDM.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Acked-by: "Zhang, Yang Z" <yang.z.zhang@intel.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/x86/kvm/i8259.c')
| -rw-r--r-- | arch/x86/kvm/i8259.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c index 848206df0967..cc31f7c06d3d 100644 --- a/arch/x86/kvm/i8259.c +++ b/arch/x86/kvm/i8259.c @@ -241,6 +241,8 @@ int kvm_pic_read_irq(struct kvm *kvm) int irq, irq2, intno; struct kvm_pic *s = pic_irqchip(kvm); + s->output = 0; + pic_lock(s); irq = pic_get_irq(&s->pics[0]); if (irq >= 0) { |