| commit | e828a46e7038ae7593462e965328bee7ec2570bd | [log] [tgz] |
|---|---|---|
| author | Xuewei Zhang <[email protected]> | Thu Sep 06 20:46:29 2018 |
| committer | ChromeOS Commit Bot <[email protected]> | Sat Sep 08 06:17:18 2018 |
| tree | 99bae28199a119ee1384b6e5fae1635446a0e555 | |
| parent | f5aaf89463119a94471444e29ce12dd49b4d654e [diff] |
BACKPORT: FROMLIST: scsi: sd: Contribute to randomness when running rotational device
Currently a scsi device won't contribute to kernel randomness when it
uses blk-mq. Since we commonly use scsi on rotational device with
blk-mq, it make sense to keep contributing to kernel randomness in these
cases. This is especially important for virtual machines.
commit b5b6e8c8d3b4 ("scsi: virtio_scsi: fix IO hang caused by automatic
irq vector affinity") made all virtio-scsi device to use blk-mq, which
does not contribute to randomness today. So for a virtual machine only
having virtio-scsi disk (which is common), it will simple stop getting
randomness from its disks in today's implementation.
With this patch, if the above VM has rotational virtio-scsi device, then
it can still benefit from the entropy generated from the disk.
Reported-by: Xuewei Zhang <[email protected]>
Signed-off-by: Xuewei Zhang <[email protected]>
BUG=b:113183351
TEST=COS validation test
(am from https://patchwork.kernel.org/patch/10591031/)
Change-Id: Ia1822f1ec9f1887474e7c67edd695d6f1bfb823e
Reviewed-on: https://chromium-review.googlesource.com/1212547
Reviewed-by: Guenter Roeck <[email protected]>
Commit-Queue: Xuewei Zhang <[email protected]>
Tested-by: Xuewei Zhang <[email protected]>