KVM: use smp_send_reschedule in kvm_vcpu_kick

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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.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

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This commit is contained in:

Marcelo Tosatti 2009-05-07 17:55:12 -03:00 • committed by Avi Kivity

parent d149c731e4

commit 32f8840064

5 changed files with 26 additions and 40 deletions

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3

arch/ia64/kernel/irq_ia64.c

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22

arch/ia64/kvm/kvm-ia64.c

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3

arch/x86/kernel/smp.c

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36

arch/x86/kvm/x86.c

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2

include/linux/kvm_host.h

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