Re: [Qemu-devel] default slot used for vga device on q35 machines

[Laine Stump]

On 08/02/2013 03:23 AM, Markus Armbruster wrote:
> Gerd Hoffmann <address@hidden> writes:
>
>>   Hi,
>>
>>>   qemu-kvm -M q35 -nodefaults -nodefconfig -qmp unix:/tmp/qemu,server
>>> -vnc :15 -vga std -usb
>>>
>>> Then ran "query-pci" in the qmp monitor and found that the vga device is
>>> put at slot 1 instead of slot 2.
>>>
>>> My questions:
>>>
>>> 1) Is this difference intentional, or a bug?
>> The vga simply goes into the first free slot.  That happens to be #2
>> with i440fx and #1 with q35.
> The slot used by -vga depends on the machine type, and can be expected
> to remain stable.  We've kept it stable even for the machine type family
> i440FX.
>
> Nevertheless, if you require the graphics adapter to go into a specific
> slot, I very much recommend to control its placement with -device.

Right. We prefer explicitly specifying the pci address for everything,
but apparently in the case of multihead qxl devices, this isn't an
option (is this correct, or has there been a misunderstanding?)