diff --git a/kernel.spec b/kernel.spec index 85bfffa..c359e30 100644 --- a/kernel.spec +++ b/kernel.spec @@ -32,7 +32,7 @@ Name: kernel Version: 4.19.90 -Release: %{hulkrelease}.0237 +Release: %{hulkrelease}.0238 Summary: Linux Kernel License: GPLv2 URL: http://www.kernel.org/ @@ -836,6 +836,9 @@ fi %endif %changelog +* Thu Nov 9 2023 Kunkun Jiang - 4.19.90-2311.1.0.0238 +- scsi: virtio_scsi: limit number of hw queues by nr_cpu_ids + * Tue Nov 7 2023 YaQiang Chen - 4.19.90-2311.1.0.0237 - spec: fix the problem that patches are not packaged in src.rpm diff --git a/patches/0117-scsi-virtio_scsi-limit-number-of-hw-queues-by-nr_cpu.patch b/patches/0117-scsi-virtio_scsi-limit-number-of-hw-queues-by-nr_cpu.patch new file mode 100644 index 0000000..1e3ba27 --- /dev/null +++ b/patches/0117-scsi-virtio_scsi-limit-number-of-hw-queues-by-nr_cpu.patch @@ -0,0 +1,52 @@ +From 0e50e0bfb9bef1d26243038f0714db65a2c0e9a5 Mon Sep 17 00:00:00 2001 +From: Dongli Zhang +Date: Wed, 27 Mar 2019 18:36:35 +0800 +Subject: [PATCH] scsi: virtio_scsi: limit number of hw queues by nr_cpu_ids + +mainline inclusion +from mainline-v5.1-rc2 +commit 1978f30a87732d4d9072a20abeded9fe17884f1b +category: bugfix +bugzilla: https://gitee.com/openeuler/kernel/issues/I8F6P4 +CVE: NA + +Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1978f30a87732d4d9072a20abeded9fe17884f1b + +----------------------------------- + +When tag_set->nr_maps is 1, the block layer limits the number of hw queues +by nr_cpu_ids. No matter how many hw queues are used by virtio-scsi, as it +has (tag_set->nr_maps == 1), it can use at most nr_cpu_ids hw queues. + +In addition, specifically for pci scenario, when the 'num_queues' specified +by qemu is more than maxcpus, virtio-scsi would not be able to allocate +more than maxcpus vectors in order to have a vector for each queue. As a +result, it falls back into MSI-X with one vector for config and one shared +for queues. + +Considering above reasons, this patch limits the number of hw queues used +by virtio-scsi by nr_cpu_ids. + +Reviewed-by: Stefan Hajnoczi +Signed-off-by: Dongli Zhang +Signed-off-by: Jens Axboe +Signed-off-by: Kunkun Jiang +--- + drivers/scsi/virtio_scsi.c | 1 + + 1 file changed, 1 insertion(+) + +diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c +index 8118c06f491b..ba84514b662a 100644 +--- a/drivers/scsi/virtio_scsi.c ++++ b/drivers/scsi/virtio_scsi.c +@@ -858,6 +858,7 @@ static int virtscsi_probe(struct virtio_device *vdev) + + /* We need to know how many queues before we allocate. */ + num_queues = virtscsi_config_get(vdev, num_queues) ? : 1; ++ num_queues = min_t(unsigned int, nr_cpu_ids, num_queues); + + num_targets = virtscsi_config_get(vdev, max_target) + 1; + +-- +2.27.0 + diff --git a/series.conf b/series.conf index c02d844..44b2f18 100644 --- a/series.conf +++ b/series.conf @@ -117,3 +117,4 @@ patches/0113-perf-auxtrace-arm-Refactor-event-list-iteration-in-a.patch patches/0114-perf-auxtrace-arm64-Add-support-for-HiSilicon-PCIe-T.patch patches/0115-perf-auxtrace-arm64-Add-support-for-parsing-HiSilico.patch patches/0116-Fix-the-header-file-location-error-and-adjust-the-fu.patch +patches/0117-scsi-virtio_scsi-limit-number-of-hw-queues-by-nr_cpu.patch