* [PATCH v2 1/2] vhost: add method vhost_set_vring_err
2022-06-23 16:13 [PATCH v2 0/2] vhost: implement VHOST_SET_VRING_ERR Vladimir Sementsov-Ogievskiy
@ 2022-06-23 16:13 ` Vladimir Sementsov-Ogievskiy
2022-06-24 11:47 ` Roman Kagan
2022-06-23 16:13 ` [PATCH v2 2/2] vhost: setup error eventfd and dump errors Vladimir Sementsov-Ogievskiy
1 sibling, 1 reply; 5+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2022-06-23 16:13 UTC (permalink / raw)
To: qemu-devel
Cc: mst, vsementsov, yc-core, rvkagan, armbru, Konstantin Khlebnikov
From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Kernel and user vhost may report virtqueue errors via eventfd.
This is only reliable way to get notification about protocol error.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
---
hw/virtio/vhost-backend.c | 7 +++++++
hw/virtio/vhost-user.c | 6 ++++++
include/hw/virtio/vhost-backend.h | 3 +++
3 files changed, 16 insertions(+)
diff --git a/hw/virtio/vhost-backend.c b/hw/virtio/vhost-backend.c
index 4de8b6b3b0..8e581575c9 100644
--- a/hw/virtio/vhost-backend.c
+++ b/hw/virtio/vhost-backend.c
@@ -146,6 +146,12 @@ static int vhost_kernel_set_vring_call(struct vhost_dev *dev,
return vhost_kernel_call(dev, VHOST_SET_VRING_CALL, file);
}
+static int vhost_kernel_set_vring_err(struct vhost_dev *dev,
+ struct vhost_vring_file *file)
+{
+ return vhost_kernel_call(dev, VHOST_SET_VRING_ERR, file);
+}
+
static int vhost_kernel_set_vring_busyloop_timeout(struct vhost_dev *dev,
struct vhost_vring_state *s)
{
@@ -309,6 +315,7 @@ const VhostOps kernel_ops = {
.vhost_get_vring_base = vhost_kernel_get_vring_base,
.vhost_set_vring_kick = vhost_kernel_set_vring_kick,
.vhost_set_vring_call = vhost_kernel_set_vring_call,
+ .vhost_set_vring_err = vhost_kernel_set_vring_err,
.vhost_set_vring_busyloop_timeout =
vhost_kernel_set_vring_busyloop_timeout,
.vhost_set_features = vhost_kernel_set_features,
diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
index 4b9be26e84..75b8df21a4 100644
--- a/hw/virtio/vhost-user.c
+++ b/hw/virtio/vhost-user.c
@@ -1313,6 +1313,11 @@ static int vhost_user_set_vring_call(struct vhost_dev *dev,
return vhost_set_vring_file(dev, VHOST_USER_SET_VRING_CALL, file);
}
+static int vhost_user_set_vring_err(struct vhost_dev *dev,
+ struct vhost_vring_file *file)
+{
+ return vhost_set_vring_file(dev, VHOST_USER_SET_VRING_ERR, file);
+}
static int vhost_user_get_u64(struct vhost_dev *dev, int request, uint64_t *u64)
{
@@ -2616,6 +2621,7 @@ const VhostOps user_ops = {
.vhost_get_vring_base = vhost_user_get_vring_base,
.vhost_set_vring_kick = vhost_user_set_vring_kick,
.vhost_set_vring_call = vhost_user_set_vring_call,
+ .vhost_set_vring_err = vhost_user_set_vring_err,
.vhost_set_features = vhost_user_set_features,
.vhost_get_features = vhost_user_get_features,
.vhost_set_owner = vhost_user_set_owner,
diff --git a/include/hw/virtio/vhost-backend.h b/include/hw/virtio/vhost-backend.h
index 81bf3109f8..eab46d7f0b 100644
--- a/include/hw/virtio/vhost-backend.h
+++ b/include/hw/virtio/vhost-backend.h
@@ -69,6 +69,8 @@ typedef int (*vhost_set_vring_kick_op)(struct vhost_dev *dev,
struct vhost_vring_file *file);
typedef int (*vhost_set_vring_call_op)(struct vhost_dev *dev,
struct vhost_vring_file *file);
+typedef int (*vhost_set_vring_err_op)(struct vhost_dev *dev,
+ struct vhost_vring_file *file);
typedef int (*vhost_set_vring_busyloop_timeout_op)(struct vhost_dev *dev,
struct vhost_vring_state *r);
typedef int (*vhost_set_features_op)(struct vhost_dev *dev,
@@ -145,6 +147,7 @@ typedef struct VhostOps {
vhost_get_vring_base_op vhost_get_vring_base;
vhost_set_vring_kick_op vhost_set_vring_kick;
vhost_set_vring_call_op vhost_set_vring_call;
+ vhost_set_vring_err_op vhost_set_vring_err;
vhost_set_vring_busyloop_timeout_op vhost_set_vring_busyloop_timeout;
vhost_set_features_op vhost_set_features;
vhost_get_features_op vhost_get_features;
--
2.25.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH v2 2/2] vhost: setup error eventfd and dump errors
2022-06-23 16:13 [PATCH v2 0/2] vhost: implement VHOST_SET_VRING_ERR Vladimir Sementsov-Ogievskiy
2022-06-23 16:13 ` [PATCH v2 1/2] vhost: add method vhost_set_vring_err Vladimir Sementsov-Ogievskiy
@ 2022-06-23 16:13 ` Vladimir Sementsov-Ogievskiy
2022-06-24 13:11 ` Roman Kagan
1 sibling, 1 reply; 5+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2022-06-23 16:13 UTC (permalink / raw)
To: qemu-devel
Cc: mst, vsementsov, yc-core, rvkagan, armbru, Konstantin Khlebnikov
From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Vhost has error notifications, let's log them like other errors.
For each virt-queue setup eventfd for vring error notifications.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
[vsementsov: rename patch, change commit message and dump error like
other errors in the file]
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
---
hw/virtio/vhost.c | 37 +++++++++++++++++++++++++++++++++++++
include/hw/virtio/vhost.h | 1 +
2 files changed, 38 insertions(+)
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 6c41fa13e3..0827d631c0 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -1278,6 +1278,19 @@ static int vhost_virtqueue_set_busyloop_timeout(struct vhost_dev *dev,
return 0;
}
+static void vhost_virtqueue_error_notifier(EventNotifier *n)
+{
+ struct vhost_virtqueue *vq = container_of(n, struct vhost_virtqueue,
+ error_notifier);
+ struct vhost_dev *dev = vq->dev;
+ int index = vq - dev->vqs;
+
+ if (event_notifier_test_and_clear(n) && dev->vdev) {
+ VHOST_OPS_DEBUG(-EINVAL, "vhost vring error in virtqueue %d",
+ dev->vq_index + index);
+ }
+}
+
static int vhost_virtqueue_init(struct vhost_dev *dev,
struct vhost_virtqueue *vq, int n)
{
@@ -1299,7 +1312,27 @@ static int vhost_virtqueue_init(struct vhost_dev *dev,
vq->dev = dev;
+ if (dev->vhost_ops->vhost_set_vring_err) {
+ r = event_notifier_init(&vq->error_notifier, 0);
+ if (r < 0) {
+ goto fail_call;
+ }
+
+ file.fd = event_notifier_get_fd(&vq->error_notifier);
+ r = dev->vhost_ops->vhost_set_vring_err(dev, &file);
+ if (r) {
+ VHOST_OPS_DEBUG(r, "vhost_set_vring_err failed");
+ goto fail_err;
+ }
+
+ event_notifier_set_handler(&vq->error_notifier,
+ vhost_virtqueue_error_notifier);
+ }
+
return 0;
+
+fail_err:
+ event_notifier_cleanup(&vq->error_notifier);
fail_call:
event_notifier_cleanup(&vq->masked_notifier);
return r;
@@ -1308,6 +1341,10 @@ fail_call:
static void vhost_virtqueue_cleanup(struct vhost_virtqueue *vq)
{
event_notifier_cleanup(&vq->masked_notifier);
+ if (vq->dev->vhost_ops->vhost_set_vring_err) {
+ event_notifier_set_handler(&vq->error_notifier, NULL);
+ event_notifier_cleanup(&vq->error_notifier);
+ }
}
int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h
index b291fe4e24..1e7cbd9a10 100644
--- a/include/hw/virtio/vhost.h
+++ b/include/hw/virtio/vhost.h
@@ -29,6 +29,7 @@ struct vhost_virtqueue {
unsigned long long used_phys;
unsigned used_size;
EventNotifier masked_notifier;
+ EventNotifier error_notifier;
struct vhost_dev *dev;
};
--
2.25.1
^ permalink raw reply related [flat|nested] 5+ messages in thread