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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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4
include/linux/kvm.h
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@ -396,6 +396,9 @@ struct kvm_trace_rec {
#if defined(CONFIG_X86)
#define KVM_CAP_SET_GUEST_DEBUG 23
#endif
#if defined(CONFIG_X86)
#define KVM_CAP_REINJECT_CONTROL 24
#endif
/*
* ioctls for VM fds
@ -429,6 +432,7 @@ struct kvm_trace_rec {
struct kvm_assigned_pci_dev)
#define KVM_ASSIGN_IRQ _IOR(KVMIO, 0x70, \
struct kvm_assigned_irq)
#define KVM_REINJECT_CONTROL _IO(KVMIO, 0x71)
/*
* ioctls for vcpu fds