On Fri, Jul 31, 2026 at 06:34:14PM +0800, Jia Jia wrote:
> VHOST_SET_FEATURES is also used to update logging while a device is
> running. When ACCESS_PLATFORM stays enabled, allocating a new empty
> IOTLB on every call drops valid translations and forces avoidable
> misses.
>
> Initialize the device IOTLB only when one does not already exist.
>
> Signed-off-by: Jia Jia <[email protected]>
You did not CCc all maintainers and lists with this patchset.
./scripts/get_maintainer.pl -f drivers/vhost/vsock.c
will help find out whom to copy.
thanks!
> ---
> drivers/vhost/vsock.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
> index 562b9e139a76..3703fd219039 100644
> --- a/drivers/vhost/vsock.c
> +++ b/drivers/vhost/vsock.c
> @@ -893,7 +893,8 @@ static int vhost_vsock_set_features(struct vhost_vsock
> *vsock, u64 features)
> goto err;
> }
>
> - if ((features & (1ULL << VIRTIO_F_ACCESS_PLATFORM))) {
> + if ((features & (1ULL << VIRTIO_F_ACCESS_PLATFORM)) &&
> + !vsock->dev.iotlb) {
> if (vhost_init_device_iotlb(&vsock->dev))
> goto err;
> }
> --
> 2.34.1
