Re: [Xen-devel] [qemu-upstream-unstable test] 21375: regressions - FAIL

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

On Fri, Nov 01, 2013 at 12:06:51PM +0000, Ian Campbell wrote:
> On Fri, 2013-11-01 at 11:58 +0000, Anthony PERARD wrote:
> > On Fri, Nov 01, 2013 at 10:43:16AM +0000, Ian Campbell wrote:
> > > On Fri, 2013-11-01 at 10:38 +0000, xen.org wrote:
> > > > flight 21375 qemu-upstream-unstable real [real]
> > > > http://www.chiark.greenend.org.uk/~xensrcts/logs/21375/
> > > > 
> > > > Regressions :-(
> > > > 
> > > > Tests which did not succeed and are blocking,
> > > > including tests which could not be run:
> > > >  test-amd64-i386-qemuu-rhel6hvm-intel  7 redhat-install    fail REGR. 
> > > > vs. 20054
> > > 
> > > Anythony, have you made any progress on this? It's been failing for ages
> > > now...
> > 
> > Yes, looks like the bug it trigger during a vesa resolution change. I
> > have try to use the vgabios blob that we use for qemu-traditionnal and
> > it works fine. But with the vgabios blob provided by qemu, it does not
> > work... I'm still not sure of what the bug is, but I'm getting closer to
> > it.
> 
> Yay!
> 
> > Also, this happen only on an Intel machine, on an AMD machine,
> > everything works like a charm.
> > 
> > More detail, if anyone want to know:
> > It's look like syslinux is doing a int 10h call that never return to set
> > video mode:
> > Int 0x10, with AX=0x4F02
> 
> This looks like it might be handled by SeaBIOS vgasrc/vbe.c:vbe_104f00 ?
> There seem to be a few changes in upstream seabios since the version
> referenced in xen.git:Config.mk. Many of them are cleanups/code motion
> but a few look worth investigating. 

I've been able to get the things working by applying a patch to vgabios
that is in xen tree: a0e7ccf6864c196906d58b54cd0996b4dbc1b022
This patch allow to clear the framebuffer much faster.

But it those not really help be to understand why the guest freeze. A
couple more printf might.

-- 
Anthony PERARD

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