linux-kernel - Re: kvm: RDTSCP on AMD

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Message-ID: <20181210203925.GG5482@zn.tnic>
Date:   Mon, 10 Dec 2018 21:39:25 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Eduardo Habkost <ehabkost@...hat.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Jörg Rödel <joro@...tes.org>,
        Andre Przywara <andre.przywara@....com>,
        kvm ML <kvm@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        "Daniel P. Berrange" <berrange@...hat.com>,
        Eric Blake <eblake@...hat.com>
Subject: Re: kvm: RDTSCP on AMD

On Mon, Dec 10, 2018 at 06:08:43PM -0200, Eduardo Habkost wrote:
> | The Opteron_G2, OpteronG3, Opteron_G4, and Opteron_G5 CPU
> | models require KVM support for RDTSCP, which was added on
> | Linux 4.5.

I've added that to the current diff:

"The OpteronG[345] CPU models require KVM support for RDTSCP, which was
added with Linux 4.5."

In the meantime, I tried executing RDTSCP on a K8 laptop and it gave
SIGILL so I'd say the AMD docs have a typo and family 0xf - at least the
A-E revisions of which model 6 is a part of - doesn't have RDTSCP.

But let's see...

Thx.

-- 
Regards/Gruss,
    Boris.

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