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


From: Laszlo Ersek
Subject: Re: [Qemu-devel] [RFC] virtio-mmio: implement modern (v2) personality (virtio-1)
Date: Tue, 30 Jul 2019 18:06:42 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

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.

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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