On Wed, Sep 21, 2022 at 11:27:29AM +0300, Alvaro Karsz wrote:

Support for the VIRTIO_BLK_F_SECURE_ERASE VirtIO feature.

A device that offers this feature can receive VIRTIO_BLK_T_SECURE_ERASE
commands.

A device which supports this feature has the following fields in the
virtio config:

- max_secure_erase_sectors
- max_secure_erase_seg
- secure_erase_sector_alignment

max_secure_erase_sectors and secure_erase_sector_alignment are expressed
in 512-byte units.

Every secure erase command has the following fields:

- sectors: The starting offset in 512-byte units.
- num_sectors: The number of sectors.

Signed-off-by: Alvaro Karsz <alvaro.karsz@solid-run.com>
---
v2:
	- Set queue max discard segments as the minimum between
	  max_secure_erase_seg and max_discard_seg.
	- Set queue discard granularity as the minimum between
	  secure_erase_sector_alignment and discard_sector_alignment.

v3:
	- Usage of min_not_zero.
	- Fail probe if any of the secure erase parameters in the virtio
	  config is 0.
	- Add a comment explaining why we use the minimum between the discard
	  and secure erase limits.
---
 drivers/block/virtio_blk.c      | 110 ++++++++++++++++++++++++++------
 include/uapi/linux/virtio_blk.h |  19 ++++++
 2 files changed, 111 insertions(+), 18 deletions(-)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>