Re: [Xen-devel] No graphics with xen pv and Fedora qemu

[Michael Young <m.a.young@xxxxxxxxxxxx>]

On Wed, 29 Jun 2016, Michael Young wrote:

> I have been trying to trace a problem when using Fedora's qemu with a pv 
> guest which is that no graphics are available. I get the errors
> xen be core: xen be: watching backend path (backend/console/2) failed
> xen be core: xen be: watching backend path (backend/vkbd/2) failed
> xen be core: xen be: watching backend path (backend/vfb/2) failed
> xen be core: xen be: watching backend path (backend/qdisk/2) failed
> xen be core: xen be: watching backend path (backend/qnic/2) failed
>
> in the qemu log file in /var/log/xen . So far I have traced it to rbd 
> support in qemu, because qemu-system-i386 built with the --disable-rbd 
> does have working graphics.
I tracked this down eventually. The failure is in tools/xenstore/xs.c in 
xs_watch when it tries to create a read pthread, because the initial stack 
size of 16384 is apparently too small with qemu with rbd enabled. I did 
get it to work if I increased the stack size to 24576.
        Michael Young

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