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Re: [Qemu-devel] [PATCH RFC] i386: Enable NPT and NRIPSAVE for Epyc CPUs


From: Vitaly Kuznetsov
Subject: Re: [Qemu-devel] [PATCH RFC] i386: Enable NPT and NRIPSAVE for Epyc CPUs
Date: Fri, 21 Dec 2018 15:52:20 +0100

Vitaly Kuznetsov <address@hidden> writes:

> Epyc CPUs support NPT and NRIPSAVE features and KVM exposes these when
> present. Add them to EPYC and EPYC-IBPB cpu models.
>
> Signed-off-by: Vitaly Kuznetsov <address@hidden>
> ---
> - RFC part: I'm not sure when these features first appeared, we may want to
>   modify some Opteron_* models too.

According to http://instlatx64.atw.hu/ data (thanks to Radim!) NRIPSAVE
apeared somewhere in Opteron_G3 lifetime (e.g. QuadCore AMD Opteron 2378
has is, QuadCore AMD Opteron HE 2344 doesn't), NPT was introduced a bit
earlier.

To be on the safe side we can probably add NPT and NRIPSAVE to
Opteron_G4 and Opteron_G5 too and leave Opteron_G3 as it is.

-- 
Vitaly



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