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Re: [Qemu-devel] [libvirt] Question about the host-model CPU mode
From: |
David Hildenbrand |
Subject: |
Re: [Qemu-devel] [libvirt] Question about the host-model CPU mode |
Date: |
Fri, 20 Oct 2017 15:16:07 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 |
> Hi all,
>
> we recently encountered the problem that the 'host-model' [1] has to be
> related to the machine type of a domain. We have following problem:
>
> Let's assume we've a z13 system with a QEMU 2.9 and we define a
> domain using the default s390-virtio-ccw machine together with the
> host-model CPU mode [1]. The definition will have the machine
> expanded to s390-virtio-ccw-2.9 but retain the host-model CPU mode
> in the domain definition. In a next step we upgrade to QEMU 2.10
> (first version to recognize z14). Everything is still fine, even
> though the machine runs in 2.9 compatibility mode. Finally we
> upgrade to a z14. As a consequence it is not possible to start the
> domain anymore as the machine type doesn't support our CPU host
> model (which is expanded at start time of the domain).
Actually, what is the cause of that problem? I assume it is the gs
feature (gs_allowed)?
We should really avoid such things (..._allowed) for CPU model features
in the future and clue all new such stuff to cpumodel_allowed.
--
Thanks,
David
- Re: [Qemu-devel] [libvirt] Question about the host-model CPU mode, Marc Hartmayer, 2017/10/20
- Re: [Qemu-devel] [libvirt] Question about the host-model CPU mode, David Hildenbrand, 2017/10/20
- Re: [Qemu-devel] [libvirt] Question about the host-model CPU mode, Jiri Denemark, 2017/10/20
- Re: [Qemu-devel] [libvirt] Question about the host-model CPU mode,
David Hildenbrand <=
- Re: [Qemu-devel] [libvirt] Question about the host-model CPU mode, Christian Borntraeger, 2017/10/20
- Re: [Qemu-devel] [libvirt] Question about the host-model CPU mode, David Hildenbrand, 2017/10/20
- Re: [Qemu-devel] [libvirt] Question about the host-model CPU mode, Christian Borntraeger, 2017/10/20
- Re: [Qemu-devel] [libvirt] Question about the host-model CPU mode, David Hildenbrand, 2017/10/20
- Re: [Qemu-devel] [libvirt] Question about the host-model CPU mode, Christian Borntraeger, 2017/10/20
- Re: [Qemu-devel] [libvirt] Question about the host-model CPU mode, David Hildenbrand, 2017/10/20
- Re: [Qemu-devel] [libvirt] Question about the host-model CPU mode, Christian Borntraeger, 2017/10/20
- Re: [Qemu-devel] [libvirt] Question about the host-model CPU mode, Halil Pasic, 2017/10/20
- Re: [Qemu-devel] [libvirt] Question about the host-model CPU mode, David Hildenbrand, 2017/10/20