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Re: [libvirt] [PATCH] Add Skylake Cpu Model



On Tue, May 17, 2016 at 08:45:37 +0000, Qiao, Liyong wrote:
> Hi Jirka
> Thanks for your comments,, the qemu patch is on the way, check
> https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg03951.html

Right, once the CPU model is added to QEMU, we'll update our CPU map
too.

> Even we cann't use qemu to boot a Skylake cpu virtual machine, but if
> we specify in host mode, we still can  

Yes, but you can do that even if libvirt does not report the host CPU as
Skylake.

> And besides, the follow cpu feature has already in qemu tree.
> 
> +    <!-- XSAVE CPUID[EAX=0xd,ECX=1].EAX -->
> +    <feature name='xsaveopt'>
> +      <cpuid function='0xd' eax='0x00000001'/>
> +    </feature>
> +    <feature name='xsavec'>
> +      <cpuid function='0xd' eax='0x00000002'/>
> +    </feature>
> +    <feature name='xgetbv1'>
> +      <cpuid function='0xd' eax='0x00000004'/>
> +    </feature>
> +    <feature name='xsaves' migratable='no'>
> +      <cpuid function='0xd' eax='0x00000008'/>
> +    </feature>

Yes, these features could be added even now, although this patch is not
enough. I'll take care of adding the features to libvirt.

Jirka


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