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

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.


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