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Re: [Qemu-devel] [PATCH v3 00/26] q35 qemu support
From: |
Anthony Liguori |
Subject: |
Re: [Qemu-devel] [PATCH v3 00/26] q35 qemu support |
Date: |
Mon, 22 Oct 2012 10:37:56 -0500 |
User-agent: |
Notmuch/0.13.2+93~ged93d79 (http://notmuchmail.org) Emacs/23.3.1 (x86_64-pc-linux-gnu) |
"Michael S. Tsirkin" <address@hidden> writes:
> On Mon, Oct 22, 2012 at 12:37:39PM +0200, Gerd Hoffmann wrote:
>> On 10/22/12 12:08, Michael S. Tsirkin wrote:
>> > On Mon, Oct 22, 2012 at 07:58:32AM +0200, Gerd Hoffmann wrote:
>> >> Hi,
>> >>
>> >>> Would it make sense to temporarily rename the machine type e.g.
>> >>> pc-q35-experimental to stress it's not fully supported?
>> >>
>> >> I don't think this is needed as piix will continue to be the default.
>> >
>> > Well q35 is not yet 100% ready.
>>
>> I know.
>>
>> > The point was to hide it from libvirt.
>> > libvirt should support pc-q35 not pc-q35-experimental, then
>> > it will not cause trouble.
>>
>> You'll not going to hide it that way. Libvirt will just 'qemu -M ?'
>> where q35 will show up even if you rename it to be postfixed -experimental.
>>
>> But as long as 'pc' continues to be the default the causal user will
>> never ever notice q35 is there, at least not with virt-manager (dunno
>> about boxes) as there is simply no gui way to pick the machine type.
>> You'll have to explicitly "virsh edit $guest" to switch it to q35.
>>
>> So I'm not sure what you are worryed about.
>
> I worry about need to maintain bug for bug compatibility on the
> unlikely chance that the work to complete it gets delayed and we release
> it in an unready state.
>
>> But in any case this needs
>> discussion with the libvirt folks to make sure it will actually work as
>> intended. /me tends to think a experimental bit in machine_info (which
>> is then printed by 'qemu -M ?' and the QOM-version of that) is more
>> useful than playing tricks with the name.
>>
>> cheers,
>> Gerd
>
> I agree it's best to ask libvirt folks what's the right way to hide
> a machine type from it. Add a flag so it's not listed in -M ? ?
> Jason, do you know?
We don't need to hide it from libvirt.
What I'd suggest is that for q35, we don't introduce QEMU versioned
machine types but instead provide a machine-level version.
IOW:
q35-next <- bleeding edge version of code. No compatibility guarantee
q35-0.1 <- if we decide we want to have a "tech preview" of q35 that's
incomplete but will be supported for compat
q35-1.0 <- the first "complete" release of q35 with full compat support
I think we should also alias 'q35' to 'q35-next'.
Regards,
Anthony Liguori
>
> --
> MST
- Re: [Qemu-devel] [PATCH v3 00/26] q35 qemu support, (continued)
- Re: [Qemu-devel] [PATCH v3 00/26] q35 qemu support, Michael S. Tsirkin, 2012/10/21
- Re: [Qemu-devel] [PATCH v3 00/26] q35 qemu support, Michael S. Tsirkin, 2012/10/21
- Re: [Qemu-devel] [PATCH v3 00/26] q35 qemu support, Gerd Hoffmann, 2012/10/22
- Re: [Qemu-devel] [PATCH v3 00/26] q35 qemu support, Michael S. Tsirkin, 2012/10/22
- Re: [Qemu-devel] [PATCH v3 00/26] q35 qemu support, Gerd Hoffmann, 2012/10/22
- Re: [Qemu-devel] [PATCH v3 00/26] q35 qemu support, Michael S. Tsirkin, 2012/10/22
- Re: [Qemu-devel] [PATCH v3 00/26] q35 qemu support, Eric Blake, 2012/10/22
- Re: [Qemu-devel] [PATCH v3 00/26] q35 qemu support, Michael S. Tsirkin, 2012/10/22
- Re: [Qemu-devel] [PATCH v3 00/26] q35 qemu support, Eric Blake, 2012/10/22
- Re: [Qemu-devel] [PATCH v3 00/26] q35 qemu support, Alexander Graf, 2012/10/22
- Re: [Qemu-devel] [PATCH v3 00/26] q35 qemu support,
Anthony Liguori <=
- Re: [Qemu-devel] [PATCH v3 00/26] q35 qemu support, Michael Tokarev, 2012/10/27
Re: [Qemu-devel] [PATCH v3 00/26] q35 qemu support, Michael S. Tsirkin, 2012/10/22