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Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models |
Date: |
Wed, 24 Jun 2015 16:56:18 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 |
On 24/06/2015 16:54, Peter Maydell wrote:
> > It's certainly okay for libvirt and OpenStack to use the host CPU
> > features in order to check whether a node will run a given VM. However,
> > libvirt should trust that QEMU developers will not prevent a VM from
> > running on a previously viable host, just because you change the machine
> > type.
>
> Note that this might be true for x86 but isn't (in full generality)
> necessarily so for other architectures like ARM. For instance if
> you have a host machine with a GICv3 with no v2-back-compatibility
> support, then you can run a VM whose machine type specifies a GICv3,
> but not machine types that require a GICv2...
Hmm, that was too terse. Just because you change the machine type *to a
newer version* with the same chipset.
Paolo
- Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models, (continued)
- Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models, Eduardo Habkost, 2015/06/24
- Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models, Michael S. Tsirkin, 2015/06/24
- Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models, Andreas Färber, 2015/06/24
- Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models, Michael S. Tsirkin, 2015/06/24
- Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models, Andreas Färber, 2015/06/24
- Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models, Paolo Bonzini, 2015/06/24
- Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models, Peter Maydell, 2015/06/24
- Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models,
Paolo Bonzini <=
- Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models, Eduardo Habkost, 2015/06/24
- Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models, Paolo Bonzini, 2015/06/24
- Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models, Andreas Färber, 2015/06/23
- Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models, Daniel P. Berrange, 2015/06/23
- Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models, Andreas Färber, 2015/06/23
- Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models, Eduardo Habkost, 2015/06/23
- Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models, Daniel P. Berrange, 2015/06/23
- Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models, Eduardo Habkost, 2015/06/23
- Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models, Andreas Färber, 2015/06/23
- Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models, Daniel P. Berrange, 2015/06/23