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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?cLMQZrRvIfvkSdN2l4D2ZtE5TEtTAU2JFYcM7zWYbCkd7v1vXICHT45WGb6M?= =?us-ascii?Q?axoMIi28t9PATOR0XIWCUHHUkZMKCgviAM954G6fuHFZf/qv8gp+NpEg6bVg?= =?us-ascii?Q?lu2jPU7KcKhaGwpXTVcsy0j5TpuRVLweb9o/jqM9VylpXetKP6pLGdn5ozbq?= =?us-ascii?Q?7Cv1JB3KoNL1O2bT2JUwtTNtWBFl1FpQZ2KEEJCcctfaKTlBqTuzK8yZhsls?= =?us-ascii?Q?nIog4qeVqV6z73odt9XNexHToM3S8jmnmMfHtL2DJyDGLgJohApAJ9YhL9Pu?= =?us-ascii?Q?8v9q+ZOJZ9OCUYfzzkk+xhVcP5Je0WkpYL6aEDG2XavzYYOIEOHt78unLrP8?= =?us-ascii?Q?YOOe2N15oZIBQ+XExzqNptv8sqXHBwByGdll5p+ogHY+chnMezleeBVFtmli?= =?us-ascii?Q?AZlYBe28D5yGYETf8lyj2bnPnYh/nrwZAxbkjF1G9s750bgAN30kDNJgz3in?= =?us-ascii?Q?gZ4rrnu5lZCBskWjNYIbzHCWTt7fY6ijYzEIDx4iczRk/QI4SFn0lcdk97aZ?= =?us-ascii?Q?qiWh0wBSy+yfbt1h7Ed9onm9lJ0OyeX4PyFPrnKvdh5aS545jsvxw0mpslUQ?= =?us-ascii?Q?gGSchDUJIBRCwCHZDtrmUOJBhe7GVSJOgejGbAOKH0Lfkma61Jrbm178cIYC?= =?us-ascii?Q?iM2KCSh1tTILKySkCI8ISsiMrTEZhq1dG2V+0Qrs7x6yjOD/amdbR3frYfIc?= =?us-ascii?Q?jbtkjrA/gw1srr7VkQzbfNylQ3jnyzFxi9lVaJ3gKz2x5H+Klc3o5eya8MKQ?= =?us-ascii?Q?96cQ66/BLUDxsRvsCoJjEQ5e7bMjbHGgkMi+8TRowh+4gTtf/z441XLrXcmJ?= =?us-ascii?Q?6GJxNvQJp0N8O1F62HpShVAphRxjsm6lp0HlUiFg3IHDXLdwq8tXO01xNLek?= =?us-ascii?Q?vqggCmopsFLEhlr0hArFPPd9HH2bt7Xxs1sFqAklKSmuhTFHHYVosn8TyxAH?= =?us-ascii?Q?10ZDFUsGHISWMaxiu+inlEzbyOXA84uQwE3jI0h0UxxLdUh/2OqF85TYEmPB?= =?us-ascii?Q?68QdYLrLluZeaRCSNT9R1ykm6soX++UFoy2z0Q/cX3cnzy+eIx4QZPNnUnPg?= =?us-ascii?Q?TtSMg2veqDG8iuLpbSriPIjWiIqsqkxjVs8HUnJFPPSkz2/U3pabh2SNz/JB?= =?us-ascii?Q?s1St88MyqaeIcuiXpw+m/EQ2TrI6Afc9dLmaN75ho1oIcDvxpr7f0UhAHuqK?= =?us-ascii?Q?5WP94hMkdqMK59uQs+CdZMVTa5qu3pVfD37TqOErZjKjYTko5OdM9CIQty12?= =?us-ascii?Q?/T3yfwN21t/3MOKQNtRBGuH3mXovI1OVTY1KTZ+bPu/10jAB0w4K9zw/+aSX?= =?us-ascii?Q?GBHGWdLNCvCoQGwLfZE2A8KOiVsfL4ZxJxE6huO2lDeVSnMd8OL+c3OtvA8g?= =?us-ascii?Q?SicomBFzvIyAhJSGo4iwyt0efeJOc4TIfkWBWFH+xsrLikzMcpykyfT5McjI?= =?us-ascii?Q?LO+yuzIfknaD3qryUa0HSZ1qTclCHCYhINSxc29Km37CqWdlL+Lrw1l8yGbp?= =?us-ascii?Q?KKZx0GJei77GMxmd9GXjGCdyDZv071I0N287VAWhzbSf9CLgStDQZiBeCUS4?= =?us-ascii?Q?EUmWKuEX4lGqe7fntfV6FhpiY8oVInuFKy14P5VslKcIBS/OB7PabJgIPPzX?= =?us-ascii?Q?Fu8BSSbqkP367mDN19gFgX/XqCMrmvTDD2JFs37H3K6fCx8OTibg8f8TmmJM?= =?us-ascii?Q?mfkCPOHd8VWJ3rbXULwto+pCEykOcwazfdATesTTdaaO+yDR?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3ef0e748-cdda-47e8-423f-08deef952b41 X-MS-Exchange-CrossTenant-AuthSource: CH1PR12MB9573.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Aug 2026 06:21:48.9236 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: AryqUIW0zSFXmtwWV3vsy4p1oZGbCR3rNBuSO9pgXKsMnLc1w9qkosK/Q1wXMNl4GMk55PR251lLJWxkVj4bkQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB6086 When creating many virtio-blk devices, probe starts failing with -ENOSPC (-28) because the system runs out of interrupt vectors: virtio_blk virtioNNN: probe with driver virtio_blk failed with error -28 By default virtio-blk uses managed IRQ affinity, which reserves an interrupt vector on every CPU for each device (about nr_cpus vectors per device). On a host with many CPUs and many devices this exhausts the vectors long before all devices are probed. Add use_irq_affinity (default true, no behaviour change). Set it to 0 to use unmanaged interrupts, so each device only uses a couple of vectors instead of one per CPU, allowing far more devices to probe. Signed-off-by: Liu, Changcheng diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index 32bf3ba07a9d..184f1c1f4485 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -41,6 +41,11 @@ static unsigned int poll_queues; module_param(poll_queues, uint, 0644); MODULE_PARM_DESC(poll_queues, "The number of dedicated virtqueues for polling I/O"); +static bool use_irq_affinity = true; +module_param(use_irq_affinity, bool, 0644); +MODULE_PARM_DESC(use_irq_affinity, + "Use managed IRQ affinity for virtqueues (default: true)"); + static int major; static DEFINE_IDA(vd_index_ida); @@ -1016,7 +1021,8 @@ static int init_vq(struct virtio_blk *vblk) } /* Discover virtqueues and write information to configuration. */ - err = virtio_find_vqs(vdev, num_vqs, vqs, vqs_info, &desc); + err = virtio_find_vqs(vdev, num_vqs, vqs, vqs_info, + use_irq_affinity ? &desc : NULL); if (err) goto out; -- 2.43.7