From: Stephane Eranian <eranian-sDzT885Ts8HQT0dZR+AlfA@public.gmane.org>
To: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: CPUID emulation
Date: Thu, 31 May 2007 04:44:47 -0700 [thread overview]
Message-ID: <20070531114447.GF22798@frankl.hpl.hp.com> (raw)
In-Reply-To: <465EB310.7080402-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
Avi,
On Thu, May 31, 2007 at 02:35:44PM +0300, Avi Kivity wrote:
> >>
> >>
> >In the case of heterogeneous migration, clearly performance counters
> >will not work well, especially for unmodified guests.
>
> Right.
>
> >But I can also
> >see problems when migrating from Intel Core to older P4 for instance.
> >
> >
>
> If the guest cpuid is set to a least common denominator, it should work.
>
There is no common denominator between a P4 and Intel Core 2 Duo for the
performance counters. So you cannot simply use a generic member of family
15 to fake the guest cpuid runnning on Intel Core 2 Duo host.
--
-Stephane
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next prev parent reply other threads:[~2007-05-31 11:44 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-31 8:20 CPUID emulation Stephane Eranian
[not found] ` <20070531082006.GB22798-HU54gidqsKnWxDs0y9d3MAC/G2K4zDHf@public.gmane.org>
2007-05-31 8:39 ` Avi Kivity
[not found] ` <465E89A8.9020201-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-05-31 11:29 ` Stephane Eranian
[not found] ` <20070531112906.GC22798-HU54gidqsKnWxDs0y9d3MAC/G2K4zDHf@public.gmane.org>
2007-05-31 11:35 ` Avi Kivity
[not found] ` <465EB310.7080402-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-05-31 11:44 ` Stephane Eranian [this message]
[not found] ` <20070531114447.GF22798-HU54gidqsKnWxDs0y9d3MAC/G2K4zDHf@public.gmane.org>
2007-05-31 11:52 ` Avi Kivity
[not found] ` <465EB6E5.7000000-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-05-31 11:58 ` Stephane Eranian
[not found] ` <20070531115841.GG22798-HU54gidqsKnWxDs0y9d3MAC/G2K4zDHf@public.gmane.org>
2007-05-31 15:12 ` Troy Benjegerdes
[not found] ` <20070531151244.GC6474-na1kE3HDu0idQnJuSAr7PQ@public.gmane.org>
2007-05-31 15:38 ` ron minnich
2007-05-31 18:30 ` Ulrich Drepper
[not found] ` <465F145F.5040003-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2007-06-01 1:12 ` H. Peter Anvin
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