linux-kernel - Re: [PATCH 0/4] KVM: x86: kvm_mwait_in

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Message-ID: <804dde7b-2eff-96e9-5fb8-f2f2678c1eec@redhat.com>
Date:   Mon, 8 May 2017 09:23:11 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     "Gabriel L. Somlo" <gsomlo@...il.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Alexander Graf <agraf@...e.de>,
        "Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH 0/4] KVM: x86: kvm_mwait_in_guest() cleanup and fixes



On 06/05/2017 18:48, Gabriel L. Somlo wrote:
> So, in conclusion; it's not important to *me* that this old machine
> keeps working, I'm just volunteering test data points. So please don't
> feel obligated in any way to go out of your way on my account. OTOH,
> I'm happy to provide feedback as long as you would like me to.
> 
> Along the same lines: Paolo, as the author of commit 2c82878b0cb38fd,
> is the Xeon chip listed above one of the "obsolete for virtualization"
> models ?

Yes - I hadn't tested this model in particular, and this one is a little
less obsolete compared to the ones I found without NMI support (a 64-bit
Prescott and a 32-bit Yonah), but I still believe it's saner to treat
them as obsolete.

Can you please run vmxcap (from QEMU's git repository) on that processor
and include the output?

Paolo

> In that case, it makes no sense for me to keep using it for
> tests, and the fact that it misbehaves with L1 MWAIT should also not
> matter at all.