Merge tag 'block-pull-request' of https://gitlab.com/stefanha/qemu into staging

Pull request

Note that we're still discussing "block/blkio: Make driver nvme-io_uring take a
"path" instead of a "filename"". I have sent the pull request now so everything
is ready for the soft freeze tomorrow if we decide to go ahead with the patch.

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# gpg:                using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [ultimate]
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>" [ultimate]
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* tag 'block-pull-request' of https://gitlab.com/stefanha/qemu:
  block/blkio: Make driver nvme-io_uring take a "path" instead of a "filename"
  block/blkio: Tolerate device size changes
  block/blkio: Add virtio-blk-vfio-pci BlockDriver

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

block/blkio.c

@@ -25,6 +25,7 @@
  */
 #define DRIVER_IO_URING "io_uring"
 #define DRIVER_NVME_IO_URING "nvme-io_uring"
+#define DRIVER_VIRTIO_BLK_VFIO_PCI "virtio-blk-vfio-pci"
 #define DRIVER_VIRTIO_BLK_VHOST_USER "virtio-blk-vhost-user"
 #define DRIVER_VIRTIO_BLK_VHOST_VDPA "virtio-blk-vhost-vdpa"
 
@@ -639,12 +640,17 @@ static int blkio_io_uring_open(BlockDriverState *bs, QDict *options, int flags,
 static int blkio_nvme_io_uring(BlockDriverState *bs, QDict *options, int flags,
                                Error **errp)
 {
-    const char *filename = qdict_get_str(options, "filename");
+    const char *path = qdict_get_try_str(options, "path");
     BDRVBlkioState *s = bs->opaque;
     int ret;
 
-    ret = blkio_set_str(s->blkio, "path", filename);
-    qdict_del(options, "filename");
+    if (!path) {
+        error_setg(errp, "missing 'path' option");
+        return -EINVAL;
+    }
+
+    ret = blkio_set_str(s->blkio, "path", path);
+    qdict_del(options, "path");
     if (ret < 0) {
         error_setg_errno(errp, -ret, "failed to set path: %s",
                          blkio_get_error_msg());
@@ -704,6 +710,8 @@ static int blkio_file_open(BlockDriverState *bs, QDict *options, int flags,
         ret = blkio_io_uring_open(bs, options, flags, errp);
     } else if (strcmp(blkio_driver, DRIVER_NVME_IO_URING) == 0) {
         ret = blkio_nvme_io_uring(bs, options, flags, errp);
+    } else if (strcmp(blkio_driver, DRIVER_VIRTIO_BLK_VFIO_PCI) == 0) {
+        ret = blkio_virtio_blk_common_open(bs, options, flags, errp);
     } else if (strcmp(blkio_driver, DRIVER_VIRTIO_BLK_VHOST_USER) == 0) {
         ret = blkio_virtio_blk_common_open(bs, options, flags, errp);
     } else if (strcmp(blkio_driver, DRIVER_VIRTIO_BLK_VHOST_VDPA) == 0) {
@@ -845,6 +853,31 @@ static int64_t blkio_getlength(BlockDriverState *bs)
     return capacity;
 }
 
+static int coroutine_fn blkio_truncate(BlockDriverState *bs, int64_t offset,
+                                       bool exact, PreallocMode prealloc,
+                                       BdrvRequestFlags flags, Error **errp)
+{
+    int64_t current_length;
+
+    if (prealloc != PREALLOC_MODE_OFF) {
+        error_setg(errp, "Unsupported preallocation mode '%s'",
+                   PreallocMode_str(prealloc));
+        return -ENOTSUP;
+    }
+
+    current_length = blkio_getlength(bs);
+
+    if (offset > current_length) {
+        error_setg(errp, "Cannot grow device");
+        return -EINVAL;
+    } else if (exact && offset != current_length) {
+        error_setg(errp, "Cannot resize device");
+        return -ENOTSUP;
+    }
+
+    return 0;
+}
+
 static int blkio_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
 {
     return 0;
@@ -960,10 +993,12 @@ static void blkio_refresh_limits(BlockDriverState *bs, Error **errp)
     { \
         .format_name             = name, \
         .protocol_name           = name, \
+        .has_variable_length     = true, \
         .instance_size           = sizeof(BDRVBlkioState), \
         .bdrv_file_open          = blkio_file_open, \
         .bdrv_close              = blkio_close, \
         .bdrv_getlength          = blkio_getlength, \
+        .bdrv_co_truncate        = blkio_truncate, \
         .bdrv_get_info           = blkio_get_info, \
         .bdrv_attach_aio_context = blkio_attach_aio_context, \
         .bdrv_detach_aio_context = blkio_detach_aio_context, \
@@ -986,7 +1021,10 @@ static BlockDriver bdrv_io_uring = BLKIO_DRIVER(
 
 static BlockDriver bdrv_nvme_io_uring = BLKIO_DRIVER(
     DRIVER_NVME_IO_URING,
-    .bdrv_needs_filename = true,
+);
+
+static BlockDriver bdrv_virtio_blk_vfio_pci = BLKIO_DRIVER(
+    DRIVER_VIRTIO_BLK_VFIO_PCI
 );
 
 static BlockDriver bdrv_virtio_blk_vhost_user = BLKIO_DRIVER(
@@ -1001,6 +1039,7 @@ static void bdrv_blkio_init(void)
 {
     bdrv_register(&bdrv_io_uring);
     bdrv_register(&bdrv_nvme_io_uring);
+    bdrv_register(&bdrv_virtio_blk_vfio_pci);
     bdrv_register(&bdrv_virtio_blk_vhost_user);
     bdrv_register(&bdrv_virtio_blk_vhost_vdpa);
 }

qapi/block-core.json

@@ -2960,6 +2960,7 @@
             'raw', 'rbd',
             { 'name': 'replication', 'if': 'CONFIG_REPLICATION' },
             'ssh', 'throttle', 'vdi', 'vhdx',
+            { 'name': 'virtio-blk-vfio-pci', 'if': 'CONFIG_BLKIO' },
             { 'name': 'virtio-blk-vhost-user', 'if': 'CONFIG_BLKIO' },
             { 'name': 'virtio-blk-vhost-vdpa', 'if': 'CONFIG_BLKIO' },
             'vmdk', 'vpc', 'vvfat' ] }
@@ -3703,12 +3704,26 @@
 #
 # Driver specific block device options for the nvme-io_uring backend.
 #
-# @filename: path to the image file
+# @path: path to the image file
 #
 # Since: 7.2
 ##
 { 'struct': 'BlockdevOptionsNvmeIoUring',
-  'data': { 'filename': 'str' },
+  'data': { 'path': 'str' },
+  'if': 'CONFIG_BLKIO' }
+
+##
+# @BlockdevOptionsVirtioBlkVfioPci:
+#
+# Driver specific block device options for the virtio-blk-vfio-pci backend.
+#
+# @path: path to the PCI device's sysfs directory (e.g.
+#        /sys/bus/pci/devices/0000:00:01.0).
+#
+# Since: 7.2
+##
+{ 'struct': 'BlockdevOptionsVirtioBlkVfioPci',
+  'data': { 'path': 'str' },
   'if': 'CONFIG_BLKIO' }
 
 ##
@@ -4390,6 +4405,9 @@
       'throttle':   'BlockdevOptionsThrottle',
       'vdi':        'BlockdevOptionsGenericFormat',
       'vhdx':       'BlockdevOptionsGenericFormat',
+      'virtio-blk-vfio-pci':
+                    { 'type': 'BlockdevOptionsVirtioBlkVfioPci',
+                      'if': 'CONFIG_BLKIO' },
       'virtio-blk-vhost-user':
                     { 'type': 'BlockdevOptionsVirtioBlkVhostUser',
                       'if': 'CONFIG_BLKIO' },