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]> --- 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
