RE: ...\n

Durrant, Paul
2022-06-01T09:21:23Z

> -----Original Message-----
> From: Paolo Bonzini <pbonzini@redhat.com>
> Sent: 01 June 2022 09:57
> To: Durrant, Paul <pdurrant@amazon.co.uk>; Vitaly Kuznetsov <vkuznets@redhat.com>; Peter Zijlstra
> <peterz@infradead.org>
> Cc: Allister, Jack <jalliste@amazon.com>; bp@alien8.de; diapop@amazon.co.uk; hpa@zytor.com;
> jmattson@google.com; joro@8bytes.org; kvm@vger.kernel.org; linux-kernel@vger.kernel.org;
> metikaya@amazon.co.uk; mingo@redhat.com; rkrcmar@redhat.com; sean.j.christopherson@intel.com;
> tglx@linutronix.de; wanpengli@tencent.com; x86@kernel.org
> Subject: RE: [EXTERNAL]...\n
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> On 6/1/22 10:54, Durrant, Paul wrote:
> > That is exactly the case. This is not 'some hare-brained money
> > scheme'; there is genuine concern that moving a VM from old h/w to
> > new h/w may cause it to run 'too fast', breaking any such calibration
> > done by the guest OS/application. I also don't have any real-world
> > examples, but bugs may well be reported and having a lever to address
> > them is IMO a good idea. However, I also agree with Paolo that KVM
> > doesn't really need to be doing this when the VMM could do the job
> > using cpufreq, so we'll pursue that option instead. (FWIW the reason
> > for involving KVM was to do the freq adjustment right before entering
> > the guest and then remove the cap right after VMEXIT).
>
> But if so, you still would submit the full feature, wouldn't you?
>

Yes; the commit message should have at least said that we'd follow up... but a full series would have been a better idea.

> Paul, thanks for chiming in, and sorry for leaving you out of the list
> of people that can help Jack with his upstreaming efforts. :)
>

NP.

Paul

> Paolo