Re: [PATCH v2 0/2] vhost/vsock: fix device IOTLB feature lifecycle

[Michael S. Tsirkin]

On Fri, Jul 31, 2026 at 06:34:12PM +0800, Jia Jia wrote:
> As suggested, split the changes into two patches.
> 
> Patch 1 detaches and frees the device IOTLB when ACCESS_PLATFORM is
> cleared. The device and virtqueue IOTLB pointers, metadata caches, and
> acked features are updated while all virtqueue mutexes are held. It also
> drops old IOTLB miss messages and wakes readers.
> 
> Patch 2 keeps the current IOTLB when ACCESS_PLATFORM remains enabled,
> so a runtime logging update does not discard valid translations.

pls do not post v2 as reply to v1. confuses tools. thanks!
> Changes since v1:
> - discard the existing IOTLB instead of returning -EBUSY
> - serialize the switch against all virtqueues
> - clear old IOTLB messages and wake readers
> - move the existing-IOTLB preservation change to a separate patch
> 
> Jia Jia (2):
>   vhost/vsock: discard IOTLB when ACCESS_PLATFORM is cleared
>   vhost/vsock: keep IOTLB across feature updates
> 
>  drivers/vhost/vsock.c | 46 +++++++++++++++++++++++++++++++++++++------
>  1 file changed, 40 insertions(+), 6 deletions(-)
> 
> -- 
> 2.34.1