On Fri, Apr 26, 2013 at 05:39:15PM +0200, Igor Mammedov wrote: > On Fri, 26 Apr 2013 17:33:18 +0200 > Andreas Färber <afaer...@suse.de> wrote: > > > Am 26.04.2013 17:31, schrieb Eduardo Habkost: > > > On Fri, Apr 26, 2013 at 05:10:29PM +0200, Igor Mammedov wrote: > > >> On Thu, 25 Apr 2013 15:43:06 -0300 > > >> Eduardo Habkost <ehabk...@redhat.com> wrote: > > >> > > >>> The current code handling the CPUID 0xA leaf simply forwards all data > > >>> from GET_SUPPORTED_CPUID directly to the guest, breaking migration > > >>> between hosts with different number of PMU counters. > > >>> > > >>> This patch disables this behavior, except on older machine-types (for > > >>> compatibility) and on the "host" CPU model. > > >> Please, make it static property and use compat properties. > > >> Result will be simpler and much less will have to be redone/discarded > > >> after > > >> converting to the rest to properties and sub-classes. > > > > > > I was going to say that static properties were too much work to be done > > > in time for 1.5, but you are right: in this specific case adding a > > > static property for the cpuid_pmu_passthrough field looks very easy. I > > > will give it a try. > > > > I am hoping to get as initial set (though not all) of the static > > properties still into 1.5. Using them to fix CPUID bugs can then be done > > during Hard Freeze. :) > patch "[PATCH 02/10] target-i386: cpu: convert existing dynamic properties > into static properties" should be enough for using model,level compat > properties.
...except that we don't have X86CPU model subclasses yet, so we can't set model-specific compat properties using compat_props. Maybe we can make compat_props work for pmu-passthrough, but it may be not completely straightforward because I would like to keep it enabled by default on -cpu host. -- Eduardo
