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KVM: PIT: provide an option to disable interrupt reinjection

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Certain clocks (such as TSC) in older 2.6 guests overaccount for lost
ticks, causing severe time drift. Interrupt reinjection magnifies the
problem.

Provide an option to disable it.

[avi: allow room for expansion in case we want to disable reinjection
      of other timers]

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Marcelo Tosatti
2008-12-30 15:55:06 -02:00
committed by Avi Kivity
parent 61a6bd672b
commit 52d939a0bf
5 changed files with 35 additions and 0 deletions
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5
arch/x86/include/asm/kvm.h
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@@ -233,4 +233,9 @@ struct kvm_guest_debug_arch {
struct kvm_pit_state {
struct kvm_pit_channel_state channels[3];
};
struct kvm_reinject_control {
__u8 pit_reinject;
__u8 reserved[31];
};
#endif /* _ASM_X86_KVM_H */