[libvirt] CLZERO support for AMD
Daniel P. Berrangé
berrange at redhat.com
Mon Dec 2 11:52:38 UTC 2019
On Wed, Nov 27, 2019 at 11:10:21AM +0000, Ani Sinha wrote:
> Hi :
>
> I see a commit in qemu that adds support for CLZERO but in CPUIDs. :
>
> commit e900135dcfb676a4019dc206395e02db5d1de0d6
> Author: Sebastian Andrzej Siewior <bigeasy at linutronix.de>
> Date: Wed Sep 25 23:49:48 2019 +0200
>
> i386: Add CPUID bit for CLZERO and XSAVEERPTR
>
> The CPUID bits CLZERO and XSAVEERPTR are availble on AMD's ZEN platform
> and could be passed to the guest.
>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy at linutronix.de>
> Signed-off-by: Paolo Bonzini <pbonzini at redhat.com>
>
> Is there a corresponding change in libvirt adding this capability? Libvirt complains when I add it manually in the vm xml:
>
> # virsh create newvm.xml
> error: Failed to create domain from newvm.xml
> error: unsupported configuration: unknown CPU feature: clzero
>
> # grep clzero newvm.xml
> <feature policy='require' name='clzero'/>
>
> Should we add it?
Yes, if it is supported by QEMU to expose to a guest, then it should be
added to libvirt too.
Presumably only needs add an addition to src/cpu_maps/x86_features.xml
Regards,
Daniel
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