Avi, On Thu, May 31, 2007 at 02:52:05PM +0300, Avi Kivity wrote: > Stephane Eranian wrote: > >> > >>If the guest cpuid is set to a least common denominator, it should work. > >> > >> > >There is no common denominator between a P4 and Intel Core 2 Duo for the > >performance counters. So you cannot simply use a generic member of family > >15 to fake the guest cpuid runnning on Intel Core 2 Duo host. > > > > > > So, the performance counter functionality will not be available if you > have a mixed server farm with these processors. > That's like what is going to happen.
> If applications use model version to detect performance counters, and > not cpuid bits, then there is no way to prevent guests using performance > counters. Fortunately this is limited to specialized applications. > They use cpuid. I expect more and more applications/OS will rely on performance counters to boost performance at runtime. -- -Stephane ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ kvm-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/kvm-devel
