On Fri, 2012-08-03 at 15:05 -0300, Marcelo Tosatti wrote: > See kvm_arch_process_async_events() call to qemu_system_reset_request() > in target-i386/kvm.c. > > The whole thing is fragile, though: we rely on the order events > are processed inside KVM_RUN, in x86: > > 1) If there is pending MMIO, process it. > 2) If not, return with -EINTR (and KVM_EXIT_INTR) in case > there is a signal pending. > > That way, the vcpu will not process the stop event from the main loop > (ie not exit from the kvm_cpu_exec() loop), until MMIO is finished.
Right, it is fragile, thankfully we appear to adhere to the same ordering on powerpc so far :-) So we'll need to test but it looks like we might be able to fix our problem without a kernel or API change, just by changing qemu to do the same exit_request trick for our reboot hypercall. Long run however, I wonder whether we should consider an explicit ioctl to complete those pending operations instead... Cheers, Ben. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
