> -----Original Message----- > From: Jan Beulich [mailto:jbeul...@suse.com] > Sent: Tuesday, June 7, 2016 3:39 PM > To: Hao, Xudong <xudong....@intel.com> > Cc: Wei Liu <wei.l...@citrix.com>; Zhang, Haozhong > <haozhong.zh...@intel.com>; Xen-devel <xen-de...@lists.xenproject.org> > Subject: Re: [Xen-devel] live migration from new platform to old platform > > >>> On 07.06.16 at 09:02, <xudong....@intel.com> wrote: > > Guessing HVM context of some new instruction can't be restored to an > > old platform. Current Xen xl has cupid parameter parsing implement > > "cupid" in guest config, like cupid='host,xsave=0' > > or > > cpuid=[ '1:ecx=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx0' ] > > > > So I tried to disable some new cupid in guest config, both of the two > > below method doesn't work, the HVM guest didn't disable those cupid > > such as "hle, rtm, rdseed...". > > cpuid='host,3dnowprefetch=0,hle=0,rtm=0,rdseed=0,adx=0,smap=0' > > cpuid=['7:ebx=xxxxxxxxxxx000xxxxxx0xxxxxx0xxxx'] > > This derivation of yours doesn't look right: Leaf 7 requires a sub-leaf to be > specified (I don't recall off the top of my head what the exact syntax is). > So I first > of all wonder - did you verify that your CPUID adjustments actually too > effect (in > the sense of making it into > d->arch.cpuids[])? Because once there, I can't see how the guest > could get presented anything other than those values. >
Jan, Thanks. Yes, there is a Sub-leaf after leaf 7, with below additional line, migration succeed from Broadwell to Haswell. cpuid=['7,0:ebx=xxxxxxxxxxx000xxxxxx0xxxxxx0xxxx'] _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
