diff options
| author | Shannon Nelson <shannon.nelson@amd.com> | 2023-04-24 15:50:30 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-06-14 11:09:57 +0200 |
| commit | cfa91c0573a563a51d33513883d2e96b4f4e193b (patch) | |
| tree | d05b25a6035342707506b8026c10eac98e34f3a3 /drivers/vhost | |
| parent | 461c88caa889d95ebfa6cc66da86e3ac835cb78a (diff) | |
vhost: support PACKED when setting-getting vring_base
[ Upstream commit 55d8122f5cd62d5aaa225d7167dcd14a44c850b9 ]
Use the right structs for PACKED or split vqs when setting and
getting the vring base.
Fixes: 4c8cf31885f6 ("vhost: introduce vDPA-based backend")
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Message-Id: <20230424225031.18947-3-shannon.nelson@amd.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/vhost')
| -rw-r--r-- | drivers/vhost/vhost.c | 18 | ||||
| -rw-r--r-- | drivers/vhost/vhost.h | 8 |
2 files changed, 19 insertions, 7 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 1f9a1554ce5f..de110363af52 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -1621,17 +1621,25 @@ long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *arg r = -EFAULT; break; } - if (s.num > 0xffff) { - r = -EINVAL; - break; + if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED)) { + vq->last_avail_idx = s.num & 0xffff; + vq->last_used_idx = (s.num >> 16) & 0xffff; + } else { + if (s.num > 0xffff) { + r = -EINVAL; + break; + } + vq->last_avail_idx = s.num; } - vq->last_avail_idx = s.num; /* Forget the cached index value. */ vq->avail_idx = vq->last_avail_idx; break; case VHOST_GET_VRING_BASE: s.index = idx; - s.num = vq->last_avail_idx; + if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED)) + s.num = (u32)vq->last_avail_idx | ((u32)vq->last_used_idx << 16); + else + s.num = vq->last_avail_idx; if (copy_to_user(argp, &s, sizeof s)) r = -EFAULT; break; diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index 8f80d6b0d843..e00347f2b4d3 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -87,13 +87,17 @@ struct vhost_virtqueue { /* The routine to call when the Guest pings us, or timeout. */ vhost_work_fn_t handle_kick; - /* Last available index we saw. */ + /* Last available index we saw. + * Values are limited to 0x7fff, and the high bit is used as + * a wrap counter when using VIRTIO_F_RING_PACKED. */ u16 last_avail_idx; /* Caches available index value from user. */ u16 avail_idx; - /* Last index we used. */ + /* Last index we used. + * Values are limited to 0x7fff, and the high bit is used as + * a wrap counter when using VIRTIO_F_RING_PACKED. */ u16 last_used_idx; /* Used flags */ |