Merge branch 'vhost-net-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

1 files changed, 23 insertions, 21 deletions

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 94701ff3a23a..38244f59cdd9 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -15,6 +15,7 @@
 #include <linux/vhost.h>
 #include <linux/virtio_net.h>
 #include <linux/mm.h>
+#include <linux/mmu_context.h>
 #include <linux/miscdevice.h>
 #include <linux/mutex.h>
 #include <linux/rcupdate.h>
@@ -29,8 +30,6 @@
 #include <linux/if_packet.h>
 #include <linux/if_arp.h>
 
-#include <net/sock.h>
-
 #include "vhost.h"
 
 enum {
@@ -157,7 +156,6 @@ static void vhost_vq_reset(struct vhost_dev *dev,
 	vq->avail_idx = 0;
 	vq->last_used_idx = 0;
 	vq->used_flags = 0;
-	vq->used_flags = 0;
 	vq->log_used = false;
 	vq->log_addr = -1ull;
 	vq->vhost_hlen = 0;
@@ -178,6 +176,8 @@ static int vhost_worker(void *data)
 	struct vhost_work *work = NULL;
 	unsigned uninitialized_var(seq);
 
+	use_mm(dev->mm);
+
 	for (;;) {
 		/* mb paired w/ kthread_stop */
 		set_current_state(TASK_INTERRUPTIBLE);
@@ -192,7 +192,7 @@ static int vhost_worker(void *data)
 		if (kthread_should_stop()) {
 			spin_unlock_irq(&dev->work_lock);
 			__set_current_state(TASK_RUNNING);
-			return 0;
+			break;
 		}
 		if (!list_empty(&dev->work_list)) {
 			work = list_first_entry(&dev->work_list,
@@ -210,6 +210,8 @@ static int vhost_worker(void *data)
 			schedule();
 
 	}
+	unuse_mm(dev->mm);
+	return 0;
 }
 
 /* Helper to allocate iovec buffers for all vqs. */
@@ -402,15 +404,14 @@ void vhost_dev_cleanup(struct vhost_dev *dev)
 	kfree(rcu_dereference_protected(dev->memory,
 					lockdep_is_held(&dev->mutex)));
 	RCU_INIT_POINTER(dev->memory, NULL);
-	if (dev->mm)
-		mmput(dev->mm);
-	dev->mm = NULL;
-
 	WARN_ON(!list_empty(&dev->work_list));
 	if (dev->worker) {
 		kthread_stop(dev->worker);
 		dev->worker = NULL;
 	}
+	if (dev->mm)
+		mmput(dev->mm);
+	dev->mm = NULL;
 }
 
 static int log_access_ok(void __user *log_base, u64 addr, unsigned long sz)
@@ -881,14 +882,15 @@ static int set_bit_to_user(int nr, void __user *addr)
 static int log_write(void __user *log_base,
 		     u64 write_address, u64 write_length)
 {
+	u64 write_page = write_address / VHOST_PAGE_SIZE;
 	int r;
 	if (!write_length)
 		return 0;
-	write_address /= VHOST_PAGE_SIZE;
+	write_length += write_address % VHOST_PAGE_SIZE;
 	for (;;) {
 		u64 base = (u64)(unsigned long)log_base;
-		u64 log = base + write_address / 8;
-		int bit = write_address % 8;
+		u64 log = base + write_page / 8;
+		int bit = write_page % 8;
 		if ((u64)(unsigned long)log != log)
 			return -EFAULT;
 		r = set_bit_to_user(bit, (void __user *)(unsigned long)log);
@@ -897,7 +899,7 @@ static int log_write(void __user *log_base,
 		if (write_length <= VHOST_PAGE_SIZE)
 			break;
 		write_length -= VHOST_PAGE_SIZE;
-		write_address += VHOST_PAGE_SIZE;
+		write_page += 1;
 	}
 	return r;
 }
@@ -1092,7 +1094,7 @@ int vhost_get_vq_desc(struct vhost_dev *dev, struct vhost_virtqueue *vq,
 
 	/* Check it isn't doing very strange things with descriptor numbers. */
 	last_avail_idx = vq->last_avail_idx;
-	if (unlikely(get_user(vq->avail_idx, &vq->avail->idx))) {
+	if (unlikely(__get_user(vq->avail_idx, &vq->avail->idx))) {
 		vq_err(vq, "Failed to access avail idx at %p\n",
 		       &vq->avail->idx);
 		return -EFAULT;
@@ -1113,8 +1115,8 @@ int vhost_get_vq_desc(struct vhost_dev *dev, struct vhost_virtqueue *vq,
 
 	/* Grab the next descriptor number they're advertising, and increment
 	 * the index we've seen. */
-	if (unlikely(get_user(head,
-			      &vq->avail->ring[last_avail_idx % vq->num]))) {
+	if (unlikely(__get_user(head,
+				&vq->avail->ring[last_avail_idx % vq->num]))) {
 		vq_err(vq, "Failed to read head: idx %d address %p\n",
 		       last_avail_idx,
 		       &vq->avail->ring[last_avail_idx % vq->num]);
@@ -1213,17 +1215,17 @@ int vhost_add_used(struct vhost_virtqueue *vq, unsigned int head, int len)
 	/* The virtqueue contains a ring of used buffers.  Get a pointer to the
 	 * next entry in that used ring. */
 	used = &vq->used->ring[vq->last_used_idx % vq->num];
-	if (put_user(head, &used->id)) {
+	if (__put_user(head, &used->id)) {
 		vq_err(vq, "Failed to write used id");
 		return -EFAULT;
 	}
-	if (put_user(len, &used->len)) {
+	if (__put_user(len, &used->len)) {
 		vq_err(vq, "Failed to write used len");
 		return -EFAULT;
 	}
 	/* Make sure buffer is written before we update index. */
 	smp_wmb();
-	if (put_user(vq->last_used_idx + 1, &vq->used->idx)) {
+	if (__put_user(vq->last_used_idx + 1, &vq->used->idx)) {
 		vq_err(vq, "Failed to increment used idx");
 		return -EFAULT;
 	}
@@ -1255,7 +1257,7 @@ static int __vhost_add_used_n(struct vhost_virtqueue *vq,
 
 	start = vq->last_used_idx % vq->num;
 	used = vq->used->ring + start;
-	if (copy_to_user(used, heads, count * sizeof *used)) {
+	if (__copy_to_user(used, heads, count * sizeof *used)) {
 		vq_err(vq, "Failed to write used");
 		return -EFAULT;
 	}
@@ -1316,7 +1318,7 @@ void vhost_signal(struct vhost_dev *dev, struct vhost_virtqueue *vq)
 	 * interrupts. */
 	smp_mb();
 
-	if (get_user(flags, &vq->avail->flags)) {
+	if (__get_user(flags, &vq->avail->flags)) {
 		vq_err(vq, "Failed to get flags");
 		return;
 	}
@@ -1367,7 +1369,7 @@ bool vhost_enable_notify(struct vhost_virtqueue *vq)
 	/* They could have slipped one in as we were doing that: make
 	 * sure it's written, then check again. */
 	smp_mb();
-	r = get_user(avail_idx, &vq->avail->idx);
+	r = __get_user(avail_idx, &vq->avail->idx);
 	if (r) {
 		vq_err(vq, "Failed to check avail idx at %p: %d\n",
 		       &vq->avail->idx, r);