On Thu, Jul 28, 2011 at 10:31:43AM -0300, Luiz Capitulino wrote: > On Thu, 28 Jul 2011 10:23:22 +0300 > Avi Kivity <a...@redhat.com> wrote: > > > On 07/28/2011 12:44 AM, Blue Swirl wrote: > > > On Wed, Jul 27, 2011 at 9:42 PM, Luiz Capitulino<lcapitul...@redhat.com> > > > wrote: > > > > This function should be used when the VM is not supposed to resume > > > > execution (eg. by issuing 'cont' monitor command). > > > > > > > > Today, we allow the user to resume execution even when: > > > > > > > > o the guest shuts down and -no-shutdown is used > > > > o there's a kvm internal error > > > > o loading the VM state with -loadvm or "loadvm" in the monitor fails > > > > > > > > I think only badness can happen from the cases above. > > > > > > I'd suppose a system_reset should bring the system back to sanity and > > > then clear vm_permanent_stopped (where's -ly?) > > What's -ly? > > > > except maybe for KVM > > > internal error if that can't be recovered. Then it would not very > > > permanent anymore, so the name would need adjusting. > > > > Currently, all kvm internal errors are recoverable by reset (and > > possibly by fiddling with memory/registers). > > Ok, but a poweroff in the guest isn't recoverable with system_reset > right? Or does it depend on the guest? > > I get funny results if qemu is started with -no-shutdown and I run cont after > a poweroff in a F15 guest. Sometimes qemu will exit after a few seconds, > sometimes 'info status' will say 'running'.
libvirt uses this approach to fake a controlled soft reboot of guests. eg $ qemu .... -no-shutdown ...some time later... system_shutdown ...wait for SHUTDOWN event... system_reset cont Previous releases of QEMU had a bug in some device backends which would cause a crash sometimes, but in general it ought to work IMHO. Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
