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authorMarcelo Tosatti <mtosatti@redhat.com>2009-05-07 17:55:12 -0300
committerAvi Kivity <avi@redhat.com>2009-06-10 11:48:53 +0300
commit32f8840064d88cc3f6e85203aec7b6b57bebcb97 (patch)
tree29a42942c71e9bdf1f3e71aa1674a29aa13ce320 /arch/x86/kernel/smp.c
parentd149c731e4f71982247a14409951259f36271dd7 (diff)
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. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kernel/smp.c')
-rw-r--r--arch/x86/kernel/smp.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c
index 13f33ea8ccaa..3b2e55e8ad2b 100644
--- a/arch/x86/kernel/smp.c
+++ b/arch/x86/kernel/smp.c
@@ -172,6 +172,9 @@ void smp_reschedule_interrupt(struct pt_regs *regs)
{
ack_APIC_irq();
inc_irq_stat(irq_resched_count);
+ /*
+ * KVM uses this interrupt to force a cpu out of guest mode
+ */
}
void smp_call_function_interrupt(struct pt_regs *regs)