scsi: virtio_scsi: limit number of hw queues by nr_cpu_ids

mainline inclusion
from mainline-v5.1-rc2
commit 1978f30a
category: bugfix
bugzilla: https://gitee.com/src-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 <stefanha@redhat.com>
Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>
Signed-off-by: dingxudong <dingxudong1@huawei.com>