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SubjectRe: [PATCH v2] virtio_net: CTRL_GUEST_OFFLOADS depends on CTRL_VQ
From: "Michael S. Tsirkin" <>
Date: Sun, 5 Jan 2020 08:22:07 -0500

> The only way for guest to control offloads (as enabled by
> VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) is by sending commands
> through CTRL_VQ. So it does not make sense to
> acknowledge VIRTIO_NET_F_CTRL_GUEST_OFFLOADS without
> The spec does not outlaw devices with such a configuration, so we have
> to support it. Simply clear VIRTIO_NET_F_CTRL_GUEST_OFFLOADS.
> Note that Linux is still crashing if it tries to
> change the offloads when there's no control vq.
> That needs to be fixed by another patch.
> Reported-by: Alistair Delva <>
> Reported-by: Willem de Bruijn <>
> Fixes: 3f93522ffab2 ("virtio-net: switch off offloads on demand if possible on XDP set")
> Signed-off-by: Michael S. Tsirkin <>
> ---
> Same patch as v1 but update documentation so it's clear it's not
> enough to fix the crash.

Where are we with this patch? There seems to still be some unresolved
discussion about how we should actually handle this case.


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