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xen-devel
[Xen-devel] Re: [PATCH v5] xen_console: support the new extended xenstor
On Mon, 4 Jul 2011, Alexander Graf wrote:
>
> On 30.06.2011, at 19:26, <stefano.stabellini@xxxxxxxxxxxxx>
> <stefano.stabellini@xxxxxxxxxxxxx> wrote:
>
> > From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> >
> > Since CS 21994 on xen-unstable.hg and CS
> > 466608f3a32e1f9808acdf832a5843af37e5fcec on qemu-xen-unstable.git, few
> > changes have been introduced to the PV console xenstore protocol, as
> > described by the document docs/misc/console.txt under xen-unstable.hg.
> >
> > From the Qemu point of view, very few modifications are needed to
> > correctly support the protocol: read from xenstore the "output" node
> > that tell us what the output of the PV console is going to be.
> > In case the output is a tty, write to xenstore the device name.
>
> This one breaks my usual smoke test case of executing a Xen PV machine:
>
> $ ./x86_64-softmmu/qemu-system-x86_64 -xen-create -xen-domid 2 -M xenpv
> -kernel /boot/vmlinux-xen -initrd /boot/initrd-xen -append 'xencons=tty
> root=/dev/null' -nographic
>
> How about this patch on top? That way you can still override Qemu's serial
> choice with xenstore, but keep the Qemu infrastructure in place for people
> who don't want to use it. This will be especially important when Xenner comes
> around, where a Xen PV VM feels the same as any other Qemu machine.
>
I think it is a reasonable compromise.
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