Re: [Xen-devel] [PATCH] libxl: fix cirrus vga video memory setting with upstream qemu

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 9 May 2014, Ian Campbell wrote:
> On Fri, 2014-05-09 at 10:01 +0200, Fabio Fantoni wrote:
> > Il 08/05/2014 17:19, Ian Campbell ha scritto:
> > > On Thu, 2014-05-08 at 17:03 +0200, Fabio Fantoni wrote:
> > >> Il 08/05/2014 13:33, Ian Campbell ha scritto:
> > >>> On Thu, 2014-05-08 at 12:41 +0200, Fabio Fantoni wrote:
> > >>>
> > >>>> About qemu version when vgamem_mb property is added is qemu 1.3, I
> > >>>> already did detailed reply about it in stdvga patch:
> > >>>> http://lists.xen.org/archives/html/xen-devel/2014-05/msg00259.html
> > >>>> Or you mean something other?
> > >>> "in the commit message" is the bit you keep missing.
> > >> I not found 1399030886.32736.63.camel@xxxxxxxxxxxxxxxxxxxxxx with google
> > >> or thunderbird on mail archive, I not understand what post you refer :(
> > > mid.gmane.org is a good way to find these things. e.g.:
> > > http://mid.gmane.org/<1399030886.32736.63.camel@xxxxxxxxxxxxxxxxxxxxxx>
> > >
> > > Note that the <> which I quoted *are* part of the message id.
> > >
> > > The questions there were:
> > >          Is this change correct for all versions of mainline qemu which
> > >          people might be using with Xen?
> > 
> > vgamem_mb property was added in qemu 1.3 (same for stdvga patch),
> 
> How was the video RAM size controller in qemu prior to that? Or was it
> not possible?
> 
> >  xen 
> > 4.4 from source use qemu 1.6, and from distributions package is newer 
> > all case I saw, then FWIK there should be no problems. Xen 4.4 if I 
> > remember good change other important qemu value for hvm domUs that 
> > require qemu>=1.6. (1.6.1 because 1.6.0 have critical regression for all 
> > hvm domUs)
> 
> Stefano/Anthony -- can you confirm that we already depend on qemu >=
> 1.6.x (or otherwise that it is OK to depend on qemu >= 1.3)?

From upstream QEMU POV anything older than 1.7 is "ancient" and
unmaintained.

From Xen POV the upstream QEMU version that we released with Xen 4.2 was
based on QEMU v1.0.1, the one we released with Xen 4.3 was based on
v1.3.0.

Given that upstream QEMU with Xen 4.2 was a tech preview and that if I
am not mistaken we don't maintain Xen 4.2 anymore, it should be OK to
depend on QEMU >= 1.3.


> An ack from you guys on this change would be appreciated.

I think the change is OK but I wonder if we should write down somewhere,
maybe in the 4.5 release notes or on the wiki, that we depend on QEMU >=
1.3.


> It's also been proposed that we backport this to stable branches, how
> far back would it be safe/acceptable for us to go with that?
> [...]

Anything newer than 4.2 should be OK.

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