Re: [PATCH v4 0/3] vhost/vsock: fix device IOTLB feature lifecycle

[Stefano Garzarella <sgarzare@redhat.com>]

On Fri, Aug 14, 2026 at 03:29:00PM +0800, Jia Jia wrote:
>vhost-vsock leaves the device IOTLB attached when userspace clears
>VIRTIO_F_ACCESS_PLATFORM. It also replaces an existing IOTLB with an
>empty one whenever a later feature update keeps ACCESS_PLATFORM enabled.
>
>Patch 1 adds a common vhost helper that detaches the device IOTLB from
>all virtqueues, clears their metadata caches, drops queued IOTLB miss
>messages, and frees the old table after all virtqueues have released
>their pointers.

In the v3 you mentioned that this could be used also in vhost-net and 
maybe vhost-scsi. Would it be better to include the other patches in 
this series as well, since we're basically fixing the same issues, or 
have they already been merged?

Thanks,
Stefano

>
>Patch 2 uses the helper when vhost-vsock clears ACCESS_PLATFORM. The
>acked_features update remains in the vhost-vsock-specific loop.
>
>Patch 3 avoids replacing an existing IOTLB when ACCESS_PLATFORM remains
>enabled across a feature update.
>
>Changes since v3:
>- move the IOTLB teardown helper from vhost-vsock into common vhost code
>- keep acked_features updates in the backend-specific loop
>- add the common helper as a separate first patch
>
>Jia Jia (3):
>  vhost: add helper to clear device IOTLB
>  vhost/vsock: discard IOTLB when ACCESS_PLATFORM is cleared
>  vhost/vsock: keep IOTLB across feature updates
>
> drivers/vhost/vhost.c | 24 ++++++++++++++++++++++++
> drivers/vhost/vhost.h |  1 +
> drivers/vhost/vsock.c |  7 ++++++-
> 3 files changed, 31 insertions(+), 1 deletion(-)
>
>-- 
>2.34.1
>