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KVM: x86: Optimize NMI watchdog delivery

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As suggested by Avi, this patch introduces a counter of VCPUs that have
LVT0 set to NMI mode. Only if the counter > 0, we push the PIT ticks via
all LAPIC LVT0 lines to enable NMI watchdog support.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Acked-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Jan Kiszka
2008-10-20 10:20:03 +02:00
committed by Avi Kivity
parent 8fdb2351d5
commit cc6e462cd5
3 changed files with 27 additions and 8 deletions
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arch/x86/include/asm/kvm_host.h
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@@ -361,6 +361,7 @@ struct kvm_arch{
struct kvm_ioapic *vioapic;
struct kvm_pit *vpit;
struct hlist_head irq_ack_notifier_list;
int vapics_in_nmi_mode;
int round_robin_prev_vcpu;
unsigned int tss_addr;