diff options
| author | Qing He <qing.he@intel.com> | 2007-09-17 10:47:13 +0400 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2007-10-13 12:18:26 +0400 |
| commit | 40487c680d5855459dfdce340df13d40071bb774 (patch) | |
| tree | abc0ec56ecb1b6d1533b918621c060a1d38fccef /drivers/kvm/irq.c | |
| parent | 5cd4f6fd8506f59cb8a232f364c54f6bd8e5150a (diff) | |
| download | linux-40487c680d5855459dfdce340df13d40071bb774.tar.xz | |
KVM: deliver PIC interrupt only to vcpu0
This patch changes the PIC interrupts delivery. Now it is only delivered
to vcpu0 when either condition is met (on vcpu0):
1. local APIC is hardware disabled
2. LVT0 is unmasked and configured to delivery mode ExtInt
It fixes the 2x faster wall clock on x86_64 and SMP i386 Linux guests
Signed-off-by: Eddie (Yaozu) Dong <eddie.dong@intel.com>
Signed-off-by: Qing He <qing.he@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm/irq.c')
| -rw-r--r-- | drivers/kvm/irq.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/drivers/kvm/irq.c b/drivers/kvm/irq.c index b88e50115588..7628c7ff628f 100644 --- a/drivers/kvm/irq.c +++ b/drivers/kvm/irq.c @@ -33,8 +33,11 @@ int kvm_cpu_has_interrupt(struct kvm_vcpu *v) struct kvm_pic *s; if (kvm_apic_has_interrupt(v) == -1) { /* LAPIC */ - s = pic_irqchip(v->kvm); /* PIC */ - return s->output; + if (kvm_apic_accept_pic_intr(v)) { + s = pic_irqchip(v->kvm); /* PIC */ + return s->output; + } else + return 0; } return 1; } @@ -50,9 +53,11 @@ int kvm_cpu_get_interrupt(struct kvm_vcpu *v) vector = kvm_get_apic_interrupt(v); /* APIC */ if (vector == -1) { - s = pic_irqchip(v->kvm); - s->output = 0; /* PIC */ - vector = kvm_pic_read_irq(s); + if (kvm_apic_accept_pic_intr(v)) { + s = pic_irqchip(v->kvm); + s->output = 0; /* PIC */ + vector = kvm_pic_read_irq(s); + } } return vector; } |