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-rw-r--r--drivers/vhost/net.c4
-rw-r--r--drivers/vhost/scsi.c2
-rw-r--r--drivers/vhost/vhost.c42
-rw-r--r--drivers/vhost/vhost.h3
-rw-r--r--drivers/vhost/vringh.c5
-rw-r--r--drivers/vhost/vsock.c30
6 files changed, 55 insertions, 31 deletions
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 5dc128a8da83..5dc34653274a 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -342,7 +342,7 @@ static int vhost_net_tx_get_vq_desc(struct vhost_net *net,
endtime = busy_clock() + vq->busyloop_timeout;
while (vhost_can_busy_poll(vq->dev, endtime) &&
vhost_vq_avail_empty(vq->dev, vq))
- cpu_relax_lowlatency();
+ cpu_relax();
preempt_enable();
r = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
out_num, in_num, NULL, NULL);
@@ -533,7 +533,7 @@ static int vhost_net_rx_peek_head_len(struct vhost_net *net, struct sock *sk)
while (vhost_can_busy_poll(&net->dev, endtime) &&
!sk_has_rx_data(sk) &&
vhost_vq_avail_empty(&net->dev, vq))
- cpu_relax_lowlatency();
+ cpu_relax();
preempt_enable();
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index b296985fda0d..253310cdaaca 100644
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -1748,7 +1748,6 @@ out:
static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
const char *name)
{
- struct se_portal_group *se_tpg;
struct vhost_scsi_nexus *tv_nexus;
mutex_lock(&tpg->tv_tpg_mutex);
@@ -1757,7 +1756,6 @@ static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
pr_debug("tpg->tpg_nexus already exists\n");
return -EEXIST;
}
- se_tpg = &tpg->se_tpg;
tv_nexus = kzalloc(sizeof(struct vhost_scsi_nexus), GFP_KERNEL);
if (!tv_nexus) {
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 06e8b81b6253..d6432603880c 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -49,7 +49,7 @@ enum {
INTERVAL_TREE_DEFINE(struct vhost_umem_node,
rb, __u64, __subtree_last,
- START, LAST, , vhost_umem_interval_tree);
+ START, LAST, static inline, vhost_umem_interval_tree);
#ifdef CONFIG_VHOST_CROSS_ENDIAN_LEGACY
static void vhost_disable_cross_endian(struct vhost_virtqueue *vq)
@@ -261,8 +261,8 @@ void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work)
if (!test_and_set_bit(VHOST_WORK_QUEUED, &work->flags)) {
/* We can only add the work to the list after we're
* sure it was not in the list.
+ * test_and_set_bit() implies a memory barrier.
*/
- smp_mb();
llist_add(&work->node, &dev->work_list);
wake_up_process(dev->worker);
}
@@ -290,6 +290,7 @@ static void vhost_vq_reset(struct vhost_dev *dev,
vq->avail = NULL;
vq->used = NULL;
vq->last_avail_idx = 0;
+ vq->last_used_event = 0;
vq->avail_idx = 0;
vq->last_used_idx = 0;
vq->signalled_used = 0;
@@ -719,7 +720,7 @@ static int memory_access_ok(struct vhost_dev *d, struct vhost_umem *umem,
static int translate_desc(struct vhost_virtqueue *vq, u64 addr, u32 len,
struct iovec iov[], int iov_size, int access);
-static int vhost_copy_to_user(struct vhost_virtqueue *vq, void *to,
+static int vhost_copy_to_user(struct vhost_virtqueue *vq, void __user *to,
const void *from, unsigned size)
{
int ret;
@@ -749,7 +750,7 @@ out:
}
static int vhost_copy_from_user(struct vhost_virtqueue *vq, void *to,
- void *from, unsigned size)
+ void __user *from, unsigned size)
{
int ret;
@@ -783,7 +784,7 @@ out:
}
static void __user *__vhost_get_user(struct vhost_virtqueue *vq,
- void *addr, unsigned size)
+ void __user *addr, unsigned size)
{
int ret;
@@ -934,8 +935,8 @@ static int umem_access_ok(u64 uaddr, u64 size, int access)
return 0;
}
-int vhost_process_iotlb_msg(struct vhost_dev *dev,
- struct vhost_iotlb_msg *msg)
+static int vhost_process_iotlb_msg(struct vhost_dev *dev,
+ struct vhost_iotlb_msg *msg)
{
int ret = 0;
@@ -1324,7 +1325,7 @@ long vhost_vring_ioctl(struct vhost_dev *d, int ioctl, void __user *argp)
r = -EINVAL;
break;
}
- vq->last_avail_idx = s.num;
+ vq->last_avail_idx = vq->last_used_event = s.num;
/* Forget the cached index value. */
vq->avail_idx = vq->last_avail_idx;
break;
@@ -2158,10 +2159,6 @@ static bool vhost_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
__u16 old, new;
__virtio16 event;
bool v;
- /* Flush out used index updates. This is paired
- * with the barrier that the Guest executes when enabling
- * interrupts. */
- smp_mb();
if (vhost_has_feature(vq, VIRTIO_F_NOTIFY_ON_EMPTY) &&
unlikely(vq->avail_idx == vq->last_avail_idx))
@@ -2169,6 +2166,10 @@ static bool vhost_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
if (!vhost_has_feature(vq, VIRTIO_RING_F_EVENT_IDX)) {
__virtio16 flags;
+ /* Flush out used index updates. This is paired
+ * with the barrier that the Guest executes when enabling
+ * interrupts. */
+ smp_mb();
if (vhost_get_user(vq, flags, &vq->avail->flags)) {
vq_err(vq, "Failed to get flags");
return true;
@@ -2183,11 +2184,26 @@ static bool vhost_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
if (unlikely(!v))
return true;
+ /* We're sure if the following conditions are met, there's no
+ * need to notify guest:
+ * 1) cached used event is ahead of new
+ * 2) old to new updating does not cross cached used event. */
+ if (vring_need_event(vq->last_used_event, new + vq->num, new) &&
+ !vring_need_event(vq->last_used_event, new, old))
+ return false;
+
+ /* Flush out used index updates. This is paired
+ * with the barrier that the Guest executes when enabling
+ * interrupts. */
+ smp_mb();
+
if (vhost_get_user(vq, event, vhost_used_event(vq))) {
vq_err(vq, "Failed to get used event idx");
return true;
}
- return vring_need_event(vhost16_to_cpu(vq, event), new, old);
+ vq->last_used_event = vhost16_to_cpu(vq, event);
+
+ return vring_need_event(vq->last_used_event, new, old);
}
/* This actually signals the guest, using eventfd. */
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index 78f3c5fc02e4..a9cbbb148f46 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -107,6 +107,9 @@ struct vhost_virtqueue {
/* Last index we used. */
u16 last_used_idx;
+ /* Last used evet we've seen */
+ u16 last_used_event;
+
/* Used flags */
u16 used_flags;
diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c
index 3bb02c60a2f5..bb8971f2a634 100644
--- a/drivers/vhost/vringh.c
+++ b/drivers/vhost/vringh.c
@@ -3,6 +3,7 @@
*
* Since these may be in userspace, we use (inline) accessors.
*/
+#include <linux/compiler.h>
#include <linux/module.h>
#include <linux/vringh.h>
#include <linux/virtio_ring.h>
@@ -820,13 +821,13 @@ EXPORT_SYMBOL(vringh_need_notify_user);
static inline int getu16_kern(const struct vringh *vrh,
u16 *val, const __virtio16 *p)
{
- *val = vringh16_to_cpu(vrh, ACCESS_ONCE(*p));
+ *val = vringh16_to_cpu(vrh, READ_ONCE(*p));
return 0;
}
static inline int putu16_kern(const struct vringh *vrh, __virtio16 *p, u16 val)
{
- ACCESS_ONCE(*p) = cpu_to_vringh16(vrh, val);
+ WRITE_ONCE(*p, cpu_to_vringh16(vrh, val));
return 0;
}
diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index e3b30ea9ece5..bbbf588540ed 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -50,11 +50,10 @@ static u32 vhost_transport_get_local_cid(void)
return VHOST_VSOCK_DEFAULT_HOST_CID;
}
-static struct vhost_vsock *vhost_vsock_get(u32 guest_cid)
+static struct vhost_vsock *__vhost_vsock_get(u32 guest_cid)
{
struct vhost_vsock *vsock;
- spin_lock_bh(&vhost_vsock_lock);
list_for_each_entry(vsock, &vhost_vsock_list, list) {
u32 other_cid = vsock->guest_cid;
@@ -63,15 +62,24 @@ static struct vhost_vsock *vhost_vsock_get(u32 guest_cid)
continue;
if (other_cid == guest_cid) {
- spin_unlock_bh(&vhost_vsock_lock);
return vsock;
}
}
- spin_unlock_bh(&vhost_vsock_lock);
return NULL;
}
+static struct vhost_vsock *vhost_vsock_get(u32 guest_cid)
+{
+ struct vhost_vsock *vsock;
+
+ spin_lock_bh(&vhost_vsock_lock);
+ vsock = __vhost_vsock_get(guest_cid);
+ spin_unlock_bh(&vhost_vsock_lock);
+
+ return vsock;
+}
+
static void
vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
struct vhost_virtqueue *vq)
@@ -195,7 +203,6 @@ static int
vhost_transport_send_pkt(struct virtio_vsock_pkt *pkt)
{
struct vhost_vsock *vsock;
- struct vhost_virtqueue *vq;
int len = pkt->len;
/* Find the vhost_vsock according to guest context id */
@@ -205,8 +212,6 @@ vhost_transport_send_pkt(struct virtio_vsock_pkt *pkt)
return -ENODEV;
}
- vq = &vsock->vqs[VSOCK_VQ_RX];
-
if (pkt->reply)
atomic_inc(&vsock->queued_replies);
@@ -506,7 +511,7 @@ static void vhost_vsock_reset_orphans(struct sock *sk)
* executing.
*/
- if (!vhost_vsock_get(vsk->local_addr.svm_cid)) {
+ if (!vhost_vsock_get(vsk->remote_addr.svm_cid)) {
sock_set_flag(sk, SOCK_DONE);
vsk->peer_shutdown = SHUTDOWN_MASK;
sk->sk_state = SS_UNCONNECTED;
@@ -562,11 +567,12 @@ static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid)
return -EINVAL;
/* Refuse if CID is already in use */
- other = vhost_vsock_get(guest_cid);
- if (other && other != vsock)
- return -EADDRINUSE;
-
spin_lock_bh(&vhost_vsock_lock);
+ other = __vhost_vsock_get(guest_cid);
+ if (other && other != vsock) {
+ spin_unlock_bh(&vhost_vsock_lock);
+ return -EADDRINUSE;
+ }
vsock->guest_cid = guest_cid;
spin_unlock_bh(&vhost_vsock_lock);
generated by cgit (git 2.34.1) at 2024-05-27 19:23:44 +0000