Re: KVM: x86: use smp_send_reschedule in kvm_vcpu_kick

[Avi Kivity <avi@redhat.com>]

Marcelo Tosatti wrote:
> OK, reworked patch:
> - change ia64 in addition to x86
> - add comment on smp send reschedule handlers about KVM's usage
>
> Untested on IA64.
>
> KVM: use smp_send_reschedule in kvm_vcpu_kick
>
> KVM uses a function call IPI to cause the exit of a guest running on a
> physical cpu. For virtual interrupt notification there is no need to
> wait on IPI receival, or to execute any function.
>
> This is exactly what the reschedule IPI does, without the overhead
> of function IPI. So use it instead of smp_call_function_single in
> kvm_vcpu_kick.
>
> Also change the "guest_mode" variable to a bit in vcpu->requests, and
> use that to collapse multiple IPI's that would be issued between the
> first one and zeroing of guest mode.
>
> This allows kvm_vcpu_kick to called with interrupts disabled.
>   

Looks good. Will wait for Xiantao's test-n-ack before applying.

-- 
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