VDUSE requires that virtqueues are first enabled before the DRIVER_OK
status flag is set; with the current API of the kernel module, it is
impossible to enable the opposite order in our block export code because
userspace is not notified when a virtqueue is enabled.
This requirement also mathces the normal initialisation order as done by
the generic vhost code in QEMU. However, commit 6c482547 accidentally
changed the order for vdpa-dev and broke access to VDUSE devices with
this.
This changes vdpa-dev to use the normal order again and use the standard
vhost callback .vhost_set_vring_enable for this. VDUSE devices can be
used with vdpa-dev again after this fix.
Cc: qemu-sta...@nongnu.org
Fixes: 6c4825476a4351530bcac17abab72295b75ffe98
Signed-off-by: Kevin Wolf <kw...@redhat.com>
---
hw/virtio/vdpa-dev.c | 5 +----
hw/virtio/vhost-vdpa.c | 17 +++++++++++++++++
2 files changed, 18 insertions(+), 4 deletions(-)
diff --git a/hw/virtio/vdpa-dev.c b/hw/virtio/vdpa-dev.c
index eb9ecea83b..13e87f06f6 100644
--- a/hw/virtio/vdpa-dev.c
+++ b/hw/virtio/vdpa-dev.c
@@ -253,14 +253,11 @@ static int vhost_vdpa_device_start(VirtIODevice *vdev,
Error **errp)
s->dev.acked_features = vdev->guest_features;
- ret = vhost_dev_start(&s->dev, vdev, false);
+ ret = vhost_dev_start(&s->dev, vdev, true);
if (ret < 0) {
error_setg_errno(errp, -ret, "Error starting vhost");
goto err_guest_notifiers;
}
- for (i = 0; i < s->dev.nvqs; ++i) {
- vhost_vdpa_set_vring_ready(&s->vdpa, i);
- }
s->started = true;
/*
diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index 3a43beb312..c4574d56c5 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -904,6 +904,22 @@ int vhost_vdpa_set_vring_ready(struct vhost_vdpa *v,
unsigned idx)
return r;
}
+static int vhost_vdpa_set_vring_enable(struct vhost_dev *dev, int enable)
+{
+ struct vhost_vdpa *v = dev->opaque;
+ unsigned int i;
+ int ret;
+
+ for (i = 0; i < dev->nvqs; ++i) {
+ ret = vhost_vdpa_set_vring_ready(v, i);
+ if (ret < 0) {
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
static int vhost_vdpa_set_config_call(struct vhost_dev *dev,
int fd)
{
@@ -1524,6 +1540,7 @@ const VhostOps vdpa_ops = {
.vhost_set_features = vhost_vdpa_set_features,
.vhost_reset_device = vhost_vdpa_reset_device,
.vhost_get_vq_index = vhost_vdpa_get_vq_index,
+ .vhost_set_vring_enable = vhost_vdpa_set_vring_enable,
.vhost_get_config = vhost_vdpa_get_config,
.vhost_set_config = vhost_vdpa_set_config,
.vhost_requires_shm_log = NULL,
--
2.43.0
