KVM: x86: Enable NMI Watchdog via in-kernel PIT source

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LINT0 of the LAPIC can be used to route PIT events as NMI watchdog ticks
into the guest. This patch aligns the in-kernel irqchip emulation with
the user space irqchip with already supports this feature. The trick is
to route PIT interrupts to all LAPIC's LVT0 lines.

Rebased and slightly polished patch originally posted by Sheng Yang.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Sheng Yang <sheng.yang@intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

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Jan Kiszka 2008-09-26 09:30:52 +02:00 • committed by Avi Kivity

parent 66a5a347c2

commit 23930f9521

3 changed files with 45 additions and 5 deletions

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15

arch/x86/kvm/i8254.c

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1

arch/x86/kvm/irq.h

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34

arch/x86/kvm/lapic.c

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