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virtio_blk: add SECURE ERASE command support

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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>
Message-Id: <20220921082729.2516779-1-alvaro.karsz@solid-run.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Alvaro Karsz
2022-09-21 11:27:29 +03:00
committed by Michael S. Tsirkin
parent c1ca352d37
commit e60d640742
2 changed files with 111 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
include/uapi/linux/virtio_blk.h
View File

@@ -40,6 +40,7 @@
#define VIRTIO_BLK_F_MQ 12 /* support more than one vq */
#define VIRTIO_BLK_F_DISCARD 13 /* DISCARD is supported */
#define VIRTIO_BLK_F_WRITE_ZEROES 14 /* WRITE ZEROES is supported */
#define VIRTIO_BLK_F_SECURE_ERASE 16 /* Secure Erase is supported */
/* Legacy feature bits */
#ifndef VIRTIO_BLK_NO_LEGACY
@@ -121,6 +122,21 @@ struct virtio_blk_config {
__u8 write_zeroes_may_unmap;
__u8 unused1[3];
/* the next 3 entries are guarded by VIRTIO_BLK_F_SECURE_ERASE */
/*
* The maximum secure erase sectors (in 512-byte sectors) for
* one segment.
*/
__virtio32 max_secure_erase_sectors;
/*
* The maximum number of secure erase segments in a
* secure erase command.
*/
__virtio32 max_secure_erase_seg;
/* Secure erase commands must be aligned to this number of sectors. */
__virtio32 secure_erase_sector_alignment;
} __attribute__((packed));
/*
@@ -155,6 +171,9 @@ struct virtio_blk_config {
/* Write zeroes command */
#define VIRTIO_BLK_T_WRITE_ZEROES 13
/* Secure erase command */
#define VIRTIO_BLK_T_SECURE_ERASE 14
#ifndef VIRTIO_BLK_NO_LEGACY
/* Barrier before this op. */
#define VIRTIO_BLK_T_BARRIER 0x80000000