Re: [PATCH] conf: cpu: Add <signature family=X model=X stepping=X/>
On Sat, Jun 11, 2022 at 12:46:26PM -0400, Cole Robinson wrote:
Internally we already collect x86 host family + model + stepping
numeric values. This exposed them in capabilities CPU output.
Example:
$ sudo virsh capabilities | grep -A1 -B1 signature
<microcode version='240'/>
<signature family='6' model='94' stepping='3'/>
<counter name='tsc' frequency='3408010000'
scaling='no'/>
Users need to know these values to calculate an expected.
SEV-ES/SEV-SNP launch measurement.
More specifically, the VMSA register dumps contain a field that
encodes the family+model+stepping. So given a generic machine
portable VMSA blob, we need to be able to update it with the
family+model+stepping of the specific host executing a VM to
get a machine specific VMSA blob. This is then used in the
launjch measurement validation.
With regards,
Daniel
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