Re: [Xen-devel] VM Feature levelling improvements proposal (draft C)

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 02/18/2014 12:57 PM, Andrew Cooper wrote:
> AMD has the CPUID override MSRs 0xc001100{4,5} which cover the basic and
> extended feature leaves.  Are there any MSRs to cover
> CPUID.0000_000D[ecx=1].eax which contains the 'XSAVEOPT' bit, or
> CPUID.0000_0007[ecx=1].ebx which is the "structured extended" feature
> map?  I cant find any reference to new override MSRs in the manuals (or
> with google), or to having cpuid faulting support like Intel cpus.

Re: XSAVEOPT --- there is a bit for XSAVE (MSRC001_1004[58]). And since 
you can't use XSAVEOPT without XSAVE (you use the latter to initialize 
the save area) I think using this bit would be sufficient.

-boris

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