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Re: [Qemu-devel] [PATCH RFC] i386: Enable NPT and NRIPSAVE for Epyc CPUs
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From: |
Vitaly Kuznetsov |
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Subject: |
Re: [Qemu-devel] [PATCH RFC] i386: Enable NPT and NRIPSAVE for Epyc CPUs |
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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