Avi Kivity wrote: > 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. kvm-ia64 is broken due to recent check-ins about irq-bits, and we are trying to fix it. For this patch, ia64 has to export the symbol smp_send_reschedule before applying the patch. Xiantao-- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
