Anthony Liguori <aliguori@xxxxxxxxxx> writes:
> Hi Rusty,
>
> Rusty Russell <rusty@xxxxxxxxxxxxxxx> writes:
>
>> Anthony Liguori <aliguori@xxxxxxxxxx> writes:
>>> 4) Do virtio-pcie, make it PCI-e friendly (drop the IO BAR completely), give
>>> it a new device/vendor ID. Continue to use virtio-pci for existing
>>> devices potentially adding virtio-{net,blk,...}-pcie variants for
>>> people that care to use them.
>>
>> Now you have a different compatibility problem; how do you know the
>> guest supports the new virtio-pcie net?
>
> We don't care.
>
> We would still use virtio-pci for existing devices. Only new devices
> would use virtio-pcie.
My concern is that new features make the virtio-pcie driver so desirable
that libvirt is pressured to use it ASAP. Have we just punted the
problem upstream?
(Of course, feature bits were supposed to avoid such a transition issue,
but mistakes accumulate).
Cheers,
Rusty.
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