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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-07 02:25:28 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-07 02:25:28 +0000 |
commit | a80d58b9b74ee560796b7d05522b85f8aac0f83d (patch) | |
tree | ae35ca367da23826dac3b62455bede286f20154f /drivers/vhost/vhost.c | |
parent | Releasing progress-linux version 6.1.85-1~progress6.99u1. (diff) | |
download | linux-a80d58b9b74ee560796b7d05522b85f8aac0f83d.tar.xz linux-a80d58b9b74ee560796b7d05522b85f8aac0f83d.zip |
Merging upstream version 6.1.90.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | drivers/vhost/vhost.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 61c72e62a..1b00ed5ef 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -2523,9 +2523,19 @@ bool vhost_vq_avail_empty(struct vhost_dev *dev, struct vhost_virtqueue *vq) r = vhost_get_avail_idx(vq, &avail_idx); if (unlikely(r)) return false; + vq->avail_idx = vhost16_to_cpu(vq, avail_idx); + if (vq->avail_idx != vq->last_avail_idx) { + /* Since we have updated avail_idx, the following + * call to vhost_get_vq_desc() will read available + * ring entries. Make sure that read happens after + * the avail_idx read. + */ + smp_rmb(); + return false; + } - return vq->avail_idx == vq->last_avail_idx; + return true; } EXPORT_SYMBOL_GPL(vhost_vq_avail_empty); @@ -2562,9 +2572,19 @@ bool vhost_enable_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq) &vq->avail->idx, r); return false; } + vq->avail_idx = vhost16_to_cpu(vq, avail_idx); + if (vq->avail_idx != vq->last_avail_idx) { + /* Since we have updated avail_idx, the following + * call to vhost_get_vq_desc() will read available + * ring entries. Make sure that read happens after + * the avail_idx read. + */ + smp_rmb(); + return true; + } - return vq->avail_idx != vq->last_avail_idx; + return false; } EXPORT_SYMBOL_GPL(vhost_enable_notify); |