vhost: Add Error parameter to vhost_dev_init()

This allows callers to return better error messages instead of making
one up while the real error ends up on stderr. Most callers can
immediately make use of this because they already have an Error
parameter themselves. The others just keep printing the error with
error_report_err().

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20210609154658.350308-2-kwolf@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

diff --git a/backends/cryptodev-vhost.c b/backends/cryptodev-vhost.c
index 8231e7f1bca9d3c35f90232c0d038abc77cc0e57..bc13e466b4f017675cc1ea9095ce8a62208518ca 100644 (file)
--- a/backends/cryptodev-vhost.c
+++ b/backends/cryptodev-vhost.c
@@ -52,6 +52,7 @@ cryptodev_vhost_init(
 {
     int r;
     CryptoDevBackendVhost *crypto;
+    Error *local_err = NULL;
 
     crypto = g_new(CryptoDevBackendVhost, 1);
     crypto->dev.max_queues = 1;
@@ -66,8 +67,10 @@ cryptodev_vhost_init(
     /* vhost-user needs vq_index to initiate a specific queue pair */
     crypto->dev.vq_index = crypto->cc->queue_index * crypto->dev.nvqs;
 
-    r = vhost_dev_init(&crypto->dev, options->opaque, options->backend_type, 0);
+    r = vhost_dev_init(&crypto->dev, options->opaque, options->backend_type, 0,
+                       &local_err);
     if (r < 0) {
+        error_report_err(local_err);
         goto fail;
     }
 

diff --git a/backends/vhost-user.c b/backends/vhost-user.c
index b366610e16e3181a2499be1c7884e5fba65e08c3..10b39992d21dc20107d8ed41a0cf889cdf0fbea3 100644 (file)
--- a/backends/vhost-user.c
+++ b/backends/vhost-user.c
@@ -48,9 +48,9 @@ vhost_user_backend_dev_init(VhostUserBackend *b, VirtIODevice *vdev,
     b->dev.nvqs = nvqs;
     b->dev.vqs = g_new0(struct vhost_virtqueue, nvqs);
 
-    ret = vhost_dev_init(&b->dev, &b->vhost_user, VHOST_BACKEND_TYPE_USER, 0);
+    ret = vhost_dev_init(&b->dev, &b->vhost_user, VHOST_BACKEND_TYPE_USER, 0,
+                         errp);
     if (ret < 0) {
-        error_setg_errno(errp, -ret, "vhost initialization failed");
         return -1;
     }
 

diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c
index c6210fad0c1359039638f4f084f9e20b2bf25bb3..0cb56baefb94cbcf3195a24b24f24e7347c6aea1 100644 (file)
--- a/hw/block/vhost-user-blk.c
+++ b/hw/block/vhost-user-blk.c
@@ -332,9 +332,9 @@ static int vhost_user_blk_connect(DeviceState *dev, Error **errp)
 
     vhost_dev_set_config_notifier(&s->dev, &blk_ops);
 
-    ret = vhost_dev_init(&s->dev, &s->vhost_user, VHOST_BACKEND_TYPE_USER, 0);
+    ret = vhost_dev_init(&s->dev, &s->vhost_user, VHOST_BACKEND_TYPE_USER, 0,
+                         errp);
     if (ret < 0) {
-        error_setg_errno(errp, -ret, "vhost initialization failed");
         return ret;
     }
 

diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index 44c1ed92dcd10f5f24fff30fd70d66619801e09e..447b119f854dc1f4029b7de1318f029717ee4b04 100644 (file)
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -22,6 +22,7 @@
 #include "standard-headers/linux/vhost_types.h"
 #include "hw/virtio/virtio-net.h"
 #include "net/vhost_net.h"
+#include "qapi/error.h"
 #include "qemu/error-report.h"
 #include "qemu/main-loop.h"
 
@@ -157,6 +158,7 @@ struct vhost_net *vhost_net_init(VhostNetOptions *options)
     bool backend_kernel = options->backend_type == VHOST_BACKEND_TYPE_KERNEL;
     struct vhost_net *net = g_new0(struct vhost_net, 1);
     uint64_t features = 0;
+    Error *local_err = NULL;
 
     if (!options->net_backend) {
         fprintf(stderr, "vhost-net requires net backend to be setup\n");
@@ -187,8 +189,10 @@ struct vhost_net *vhost_net_init(VhostNetOptions *options)
     }
 
     r = vhost_dev_init(&net->dev, options->opaque,
-                       options->backend_type, options->busyloop_timeout);
+                       options->backend_type, options->busyloop_timeout,
+                       &local_err);
     if (r < 0) {
+        error_report_err(local_err);
         goto fail;
     }
     if (backend_kernel) {

diff --git a/hw/scsi/vhost-scsi.c b/hw/scsi/vhost-scsi.c
index 4d70fa036bbe5bcb0ad16aae5833292b7a5889b5..8c611bfd2d2e28d59524663b81dd8e33656b520f 100644 (file)
--- a/hw/scsi/vhost-scsi.c
+++ b/hw/scsi/vhost-scsi.c
@@ -219,10 +219,8 @@ static void vhost_scsi_realize(DeviceState *dev, Error **errp)
     vsc->dev.backend_features = 0;
 
     ret = vhost_dev_init(&vsc->dev, (void *)(uintptr_t)vhostfd,
-                         VHOST_BACKEND_TYPE_KERNEL, 0);
+                         VHOST_BACKEND_TYPE_KERNEL, 0, errp);
     if (ret < 0) {
-        error_setg(errp, "vhost-scsi: vhost initialization failed: %s",
-                   strerror(-ret));
         goto free_vqs;
     }
 

diff --git a/hw/scsi/vhost-user-scsi.c b/hw/scsi/vhost-user-scsi.c
index 466601944289c1a2835e2952c7f85a21fc29f66f..1b2f7eed98895b8851bf13661881209c10e0676a 100644 (file)
--- a/hw/scsi/vhost-user-scsi.c
+++ b/hw/scsi/vhost-user-scsi.c
@@ -122,10 +122,8 @@ static void vhost_user_scsi_realize(DeviceState *dev, Error **errp)
     vqs = vsc->dev.vqs;
 
     ret = vhost_dev_init(&vsc->dev, &s->vhost_user,
-                         VHOST_BACKEND_TYPE_USER, 0);
+                         VHOST_BACKEND_TYPE_USER, 0, errp);
     if (ret < 0) {
-        error_setg(errp, "vhost-user-scsi: vhost initialization failed: %s",
-                   strerror(-ret));
         goto free_vhost;
     }
 

diff --git a/hw/virtio/vhost-user-fs.c b/hw/virtio/vhost-user-fs.c
index 6f7f91533d29b50228257427586007d860f70852..c59595798397ee447e804b83044f4e93ceb9683c 100644 (file)
--- a/hw/virtio/vhost-user-fs.c
+++ b/hw/virtio/vhost-user-fs.c
@@ -235,9 +235,8 @@ static void vuf_device_realize(DeviceState *dev, Error **errp)
     fs->vhost_dev.nvqs = 1 + fs->conf.num_request_queues;
     fs->vhost_dev.vqs = g_new0(struct vhost_virtqueue, fs->vhost_dev.nvqs);
     ret = vhost_dev_init(&fs->vhost_dev, &fs->vhost_user,
-                         VHOST_BACKEND_TYPE_USER, 0);
+                         VHOST_BACKEND_TYPE_USER, 0, errp);
     if (ret < 0) {
-        error_setg_errno(errp, -ret, "vhost_dev_init failed");
         goto err_virtio;
     }
 

diff --git a/hw/virtio/vhost-user-vsock.c b/hw/virtio/vhost-user-vsock.c
index a6f08c26b9a78febd5b025438f67fd7aad99a197..b6a4a25ea16103450f544113f23d4e9d9e54a94e 100644 (file)
--- a/hw/virtio/vhost-user-vsock.c
+++ b/hw/virtio/vhost-user-vsock.c
@@ -108,9 +108,8 @@ static void vuv_device_realize(DeviceState *dev, Error **errp)
     vhost_dev_set_config_notifier(&vvc->vhost_dev, &vsock_ops);
 
     ret = vhost_dev_init(&vvc->vhost_dev, &vsock->vhost_user,
-                         VHOST_BACKEND_TYPE_USER, 0);
+                         VHOST_BACKEND_TYPE_USER, 0, errp);
     if (ret < 0) {
-        error_setg_errno(errp, -ret, "vhost_dev_init failed");
         goto err_virtio;
     }
 

diff --git a/hw/virtio/vhost-vsock.c b/hw/virtio/vhost-vsock.c
index 8ddfb9abfe1bfda8062275eb5eeceaa09593b864..777cafe70db299347bcd9532c61a5d374eb7ba12 100644 (file)
--- a/hw/virtio/vhost-vsock.c
+++ b/hw/virtio/vhost-vsock.c
@@ -170,9 +170,8 @@ static void vhost_vsock_device_realize(DeviceState *dev, Error **errp)
     vhost_vsock_common_realize(vdev, "vhost-vsock");
 
     ret = vhost_dev_init(&vvc->vhost_dev, (void *)(uintptr_t)vhostfd,
-                         VHOST_BACKEND_TYPE_KERNEL, 0);
+                         VHOST_BACKEND_TYPE_KERNEL, 0, errp);
     if (ret < 0) {
-        error_setg_errno(errp, -ret, "vhost-vsock: vhost_dev_init failed");
         goto err_virtio;
     }
 

diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 7b7bde7657c9c4a869217c51db00bc9d00955add..991c67ddcd19275a45fc90f758e5807a4046c518 100644 (file)
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -1286,7 +1286,8 @@ static void vhost_virtqueue_cleanup(struct vhost_virtqueue *vq)
 }
 
 int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
-                   VhostBackendType backend_type, uint32_t busyloop_timeout)
+                   VhostBackendType backend_type, uint32_t busyloop_timeout,
+                   Error **errp)
 {
     uint64_t features;
     int i, r, n_initialized_vqs = 0;
@@ -1300,24 +1301,26 @@ int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
 
     r = hdev->vhost_ops->vhost_backend_init(hdev, opaque);
     if (r < 0) {
+        error_setg(errp, "vhost_backend_init failed");
         goto fail;
     }
 
     r = hdev->vhost_ops->vhost_set_owner(hdev);
     if (r < 0) {
-        VHOST_OPS_DEBUG("vhost_set_owner failed");
+        error_setg(errp, "vhost_set_owner failed");
         goto fail;
     }
 
     r = hdev->vhost_ops->vhost_get_features(hdev, &features);
     if (r < 0) {
-        VHOST_OPS_DEBUG("vhost_get_features failed");
+        error_setg(errp, "vhost_get_features failed");
         goto fail;
     }
 
     for (i = 0; i < hdev->nvqs; ++i, ++n_initialized_vqs) {
         r = vhost_virtqueue_init(hdev, hdev->vqs + i, hdev->vq_index + i);
         if (r < 0) {
+            error_setg_errno(errp, -r, "Failed to initialize virtqueue %d", i);
             goto fail;
         }
     }
@@ -1327,6 +1330,7 @@ int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
             r = vhost_virtqueue_set_busyloop_timeout(hdev, hdev->vq_index + i,
                                                      busyloop_timeout);
             if (r < 0) {
+                error_setg(errp, "Failed to set busyloop timeout");
                 goto fail_busyloop;
             }
         }
@@ -1367,7 +1371,7 @@ int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
     if (hdev->migration_blocker != NULL) {
         r = migrate_add_blocker(hdev->migration_blocker, &local_err);
         if (local_err) {
-            error_report_err(local_err);
+            error_propagate(errp, local_err);
             error_free(hdev->migration_blocker);
             goto fail_busyloop;
         }
@@ -1384,8 +1388,8 @@ int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
     QLIST_INSERT_HEAD(&vhost_devices, hdev, entry);
 
     if (used_memslots > hdev->vhost_ops->vhost_backend_memslots_limit(hdev)) {
-        error_report("vhost backend memory slots limit is less"
-                " than current number of present memory slots");
+        error_setg(errp, "vhost backend memory slots limit is less"
+                   " than current number of present memory slots");
         r = -1;
         goto fail_busyloop;
     }

diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h
index 21a9a52088dd01838099046587fd5bb03f1d5961..2d7aaad67b29fa9ea1f062b0d3b3b75d3d5edd4a 100644 (file)
--- a/include/hw/virtio/vhost.h
+++ b/include/hw/virtio/vhost.h
@@ -104,7 +104,7 @@ struct vhost_net {
 
 int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
                    VhostBackendType backend_type,
-                   uint32_t busyloop_timeout);
+                   uint32_t busyloop_timeout, Error **errp);
 void vhost_dev_cleanup(struct vhost_dev *hdev);
 int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev);
 void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev);