Re: [Xen-devel] [PATCH] x86/cpuid: Enable new SSE/AVX/AVX512 cpu features

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 27.10.17 at 16:18, <yang.zhong@xxxxxxxxx> wrote:
> Intel IceLake cpu has added new cpu features: AVX512VBMI2/GFNI/
> VAES/AVX512VNNI/AVX512BITALG/VPCLMULQDQ. Those new cpu features
> need expose to guest.wq

First of all, please don't forget to Cc relevant maintainers.

> The bit definition:
> CPUID.(EAX=7,ECX=0):ECX[bit 06] AVX512VBMI2
> CPUID.(EAX=7,ECX=0):ECX[bit 08] GFNI
> CPUID.(EAX=7,ECX=0):ECX[bit 09] VAES
> CPUID.(EAX=7,ECX=0):ECX[bit 10] VPCLMULQDQ

These last three have VEX (and for GFNI even legacy) encodings.
While it wouldn't be reasonable yet to request EVEX encoded insn
support to be added to the emulator while enabling new ISA
extensions, I think legacy and VEX encoded ones should be taken
care of with the state the emulator is currently in.

Jan


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