Re: [Qemu-devel] [RFC] virtio-mmio: implement modern (v2) personality (virtio-1)

[Sergio Lopez <slp@redhat.com>]

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Laszlo Ersek <lersek@redhat.com> writes:

> On 07/29/19 14:57, Sergio Lopez wrote:
>> Implement the modern (v2) personality, according to the VirtIO 1.0
>> specification.
>> 
>> Support for v2 among guests is not as widespread as it'd be
>> desirable. While the Linux driver has had it for a while, support is
>> missing, at least, from Tianocore EDK II, NetBSD and FreeBSD.
>
> That's right; not only are there no plans to implement virtio-mmio/1.0
> for OVMF (to my knowledge), I'd even argue against such efforts.

That's good to know, because I was planning to work on that (the changes
are quite small, actually) in a couple weeks. ;-)

> OVMF is a heavy-weight guest firmware, which I see entirely out of scope
> for "micro VMs". And so virtio-mmio/1.0 would seem like a needless &
> unwelcome complication, from the OVMF maintainership perspective.
>
> (This should not be construed as an argument against "micro VMs" -- I
> always say, identify your use case, then pick the right components for
> it. I never try to convince people to use OVMF indiscriminately.)
>
>> For this reason, the v2 personality is disabled, keeping the legacy
>> behavior as default. Machine types willing to use v2, can enable it
>> using MachineClass's compat_props.
>
> This approach makes me happy (with the understanding that edk2 guest
> firmware is not going to target the new machine type(s) in question).
>
> Thanks!
> Laszlo


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