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Wed, 1 Apr 2026 22:23:44 +0000 From: Aaron Tomlin To: axboe@kernel.dk, kbusch@kernel.org, hch@lst.de, sagi@grimberg.me, mst@redhat.com Cc: atomlin@atomlin.com, aacraid@microsemi.com, James.Bottomley@HansenPartnership.com, martin.petersen@oracle.com, liyihang9@h-partners.com, kashyap.desai@broadcom.com, sumit.saxena@broadcom.com, shivasharan.srikanteshwara@broadcom.com, chandrakanth.patil@broadcom.com, sathya.prakash@broadcom.com, sreekanth.reddy@broadcom.com, suganath-prabu.subramani@broadcom.com, ranjan.kumar@broadcom.com, jinpu.wang@cloud.ionos.com, tglx@kernel.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, akpm@linux-foundation.org, maz@kernel.org, ruanjinjie@huawei.com, bigeasy@linutronix.de, yphbchou0911@gmail.com, wagi@kernel.org, frederic@kernel.org, longman@redhat.com, chenridong@huawei.com, hare@suse.de, kch@nvidia.com, ming.lei@redhat.com, steve@abita.co, sean@ashe.io, chjohnst@gmail.com, neelx@suse.com, mproche@gmail.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, linux-nvme@lists.infradead.org, linux-scsi@vger.kernel.org, megaraidlinux.pdl@broadcom.com, mpi3mr-linuxdrv.pdl@broadcom.com, MPT-FusionLinux.pdl@broadcom.com Subject: [PATCH v10 08/13] virtio: blk/scsi: use block layer helpers to constrain queue affinity Date: Wed, 1 Apr 2026 18:23:07 -0400 Message-ID: <20260401222312.772334-9-atomlin@atomlin.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260401222312.772334-1-atomlin@atomlin.com> References: <20260401222312.772334-1-atomlin@atomlin.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: BN0PR04CA0011.namprd04.prod.outlook.com (2603:10b6:408:ee::16) To CWLP123MB3523.GBRP123.PROD.OUTLOOK.COM (2603:10a6:400:70::10) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CWLP123MB3523:EE_|CW1P123MB7844:EE_ X-MS-Office365-Filtering-Correlation-Id: f153671f-0c72-432e-079d-08de903d55f5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|376014|366016|56012099003|18002099003|22082099003; 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charset="utf-8" From: Daniel Wagner Ensure that IRQ affinity setup also respects the queue-to-CPU mapping constraints provided by the block layer. This allows the virtio drivers to avoid assigning interrupts to CPUs that the block layer has excluded (e.g., isolated CPUs). Reviewed-by: Hannes Reinecke Signed-off-by: Daniel Wagner Signed-off-by: Aaron Tomlin Reviewed-by: Martin K. Petersen --- drivers/block/virtio_blk.c | 4 +++- drivers/scsi/virtio_scsi.c | 5 ++++- 2 files changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index b1c9a27fe00f..9d737510454b 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -964,7 +964,9 @@ static int init_vq(struct virtio_blk *vblk) unsigned short num_vqs; unsigned short num_poll_vqs; struct virtio_device *vdev =3D vblk->vdev; - struct irq_affinity desc =3D { 0, }; + struct irq_affinity desc =3D { + .mask =3D blk_mq_possible_queue_affinity(), + }; =20 err =3D virtio_cread_feature(vdev, VIRTIO_BLK_F_MQ, struct virtio_blk_config, num_queues, diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c index 0ed8558dad72..520a7da5386e 100644 --- a/drivers/scsi/virtio_scsi.c +++ b/drivers/scsi/virtio_scsi.c @@ -849,7 +849,10 @@ static int virtscsi_init(struct virtio_device *vdev, u32 num_vqs, num_poll_vqs, num_req_vqs; struct virtqueue_info *vqs_info; struct virtqueue **vqs; - struct irq_affinity desc =3D { .pre_vectors =3D 2 }; + struct irq_affinity desc =3D { + .pre_vectors =3D 2, + .mask =3D blk_mq_possible_queue_affinity(), + }; =20 num_req_vqs =3D vscsi->num_queues; num_vqs =3D num_req_vqs + VIRTIO_SCSI_VQ_BASE; --=20 2.51.0