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Re: [Qemu-devel] [RFC 00/28] s390x CPU models: exposing features
From: |
Jiri Denemark |
Subject: |
Re: [Qemu-devel] [RFC 00/28] s390x CPU models: exposing features |
Date: |
Wed, 22 Jun 2016 10:05:52 +0200 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
On Wed, Jun 22, 2016 at 09:54:51 +0200, David Hildenbrand wrote:
> > On Wed, Jun 22, 2016 at 09:34:49 +0200, David Hildenbrand wrote:
> > > I think the coffee didn't do its work already :) . I wanted to write that
> > > we can
> > > _with_ this additional query. Meaning the involved overhead would be ok -
> > > in my
> > > opinion for s390x.
> > >
> > > What we could do to avoid one compare operation would be:
> > >
> > > a) Expand the host model
> > > b) Expand the target model (because on s390x we could have migration
> > > unsafe
> > > model)
> > > c) Work with the runnability information returned via
> > > query-cpu-definitions
> > >
> > > But as we have to do b) either way on s390x, we can directly do a compare
> > > operation. (which makes implementation a lot simpler, because libvirt then
> > > doesn't have to deal with any feature/model names).
> >
> > But why do you even need to do any comparison? Isn't it possible to let
> > QEMU do it when a domain starts? The thing is we should avoid doing
> > completely different things on each architecture.
> >
>
> Sure, QEMU will of course double check when starting the guest! So trying to
> start and failing is of course an option! So no check is needed if that is
> acceptable.
Yeah, I think it's the safest and easiest option now.
Jirka
- Re: [Qemu-devel] [RFC 00/28] s390x CPU models: exposing features, (continued)
- Re: [Qemu-devel] [RFC 00/28] s390x CPU models: exposing features, Eduardo Habkost, 2016/06/21
- Re: [Qemu-devel] [RFC 00/28] s390x CPU models: exposing features, Jiri Denemark, 2016/06/21
- Re: [Qemu-devel] [RFC 00/28] s390x CPU models: exposing features, Eduardo Habkost, 2016/06/21
- Re: [Qemu-devel] [libvirt] [RFC 00/28] s390x CPU models: exposing features, Jiri Denemark, 2016/06/22
- Re: [Qemu-devel] [libvirt] [RFC 00/28] s390x CPU models: exposing features, David Hildenbrand, 2016/06/22
- Re: [Qemu-devel] [RFC 00/28] s390x CPU models: exposing features, David Hildenbrand, 2016/06/22
- Re: [Qemu-devel] [RFC 00/28] s390x CPU models: exposing features, Jiri Denemark, 2016/06/22
- Re: [Qemu-devel] [RFC 00/28] s390x CPU models: exposing features, David Hildenbrand, 2016/06/22
- Re: [Qemu-devel] [RFC 00/28] s390x CPU models: exposing features, Jiri Denemark, 2016/06/22
- Re: [Qemu-devel] [RFC 00/28] s390x CPU models: exposing features, David Hildenbrand, 2016/06/22
- Re: [Qemu-devel] [RFC 00/28] s390x CPU models: exposing features,
Jiri Denemark <=
- Re: [Qemu-devel] [RFC 00/28] s390x CPU models: exposing features, David Hildenbrand, 2016/06/23
Re: [Qemu-devel] [RFC 00/28] s390x CPU models: exposing features, Jiri Denemark, 2016/06/21
Re: [Qemu-devel] [RFC 00/28] s390x CPU models: exposing features, David Hildenbrand, 2016/06/30