Re: [Qemu-devel] [BUGFIX][PATCH for 2.2 v3 1/1] -machine vmport=auto: Fix handling of VMWare ioport emulation for xen

[Paolo Bonzini]

On 20/11/2014 11:00, Dr. David Alan Gilbert wrote:
>> > I'm still not sure why the configuration should differ for "-M pc"
>> > depending on whether xen is enabled.
> I think this goes back to:
> 
> commit 1611977c3d8fdbdac6090cbd1f5555cee4aed6d9
> Author: Anthony PERARD <address@hidden>
> Date:   Tue May 3 17:06:54 2011 +0100
> 
>     pc, Disable vmport initialisation with Xen.
>     
>     This is because there is not synchronisation of the vcpu register
>     between Xen and QEMU, so vmport can't work properly.
>     
>     This patch introduces no_vmport parameter to pc_basic_device_init.
>     
>     Signed-off-by: Anthony PERARD <address@hidden>
>     Signed-off-by: Alexander Graf <address@hidden>

Yes, but Xen has since implemented vmport (commit 37f9e258).  It's fine
to have a conservative default for "-M xenfv" and possibly "-M pc-2.1",
but "-M pc" can require the latest hypervisor.

Paolo