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[Qemu-devel] Re: [PATCH] introduce kvm64 CPU

From: Andre Przywara
Subject: [Qemu-devel] Re: [PATCH] introduce kvm64 CPU
Date: Fri, 21 Aug 2009 23:59:39 +0200
User-agent: Thunderbird (X11/20081105)

Avi Kivity wrote:
On 08/21/2009 12:34 AM, Andre Przywara wrote:
In addition to the TCG based qemu64 type let's introduce a kvm64 CPU type,
which is the least common denominator of all KVM-capable x86-CPUs
(based on Intel Pentium 4 Prescott). It can be used as a base type
for migration.
Typically users will want more specialized greatest common denomiator cpu types; if a site has standardized on recent hardware they will want the features of that hardware exposed.
Sure, but this was not the purpose of this patch. Currently KVM guests see a CPU type which is TCG dependent, so I just wanted to get rid of this. Features of TCG and features of the host processor are totally uncorrelated. This new type should be KVM's default, leaving -cpu host as the alternative for the non-migration case.

I think this is best left to management software, which has more information about the migration pool.


Andre Przywara
AMD-Operating System Research Center (OSRC), Dresden, Germany
Tel: +49 351 488-3567-12
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