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 <[email protected]> --- 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. --- drivers/block/virtio_blk.c | 82 +++++++++++++++++++++++++-------- include/uapi/linux/virtio_blk.h | 19 ++++++++ 2 files changed, 83 insertions(+), 18 deletions(-) diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index 30255fcaf18..8a2f00cdf52 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -130,7 +130,7 @@ static int virtblk_add_req(struct virtqueue *vq, struct virtblk_req *vbr) return virtqueue_add_sgs(vq, sgs, num_out, num_in, vbr, GFP_ATOMIC); } -static int virtblk_setup_discard_write_zeroes(struct request *req, bool unmap) +static int virtblk_setup_discard_write_zeroes_erase(struct request *req, bool unmap) { unsigned short segments = blk_rq_nr_discard_segments(req); unsigned short n = 0; @@ -240,6 +240,9 @@ static blk_status_t virtblk_setup_cmd(struct virtio_device *vdev, type = VIRTIO_BLK_T_WRITE_ZEROES; unmap = !(req->cmd_flags & REQ_NOUNMAP); break; + case REQ_OP_SECURE_ERASE: + type = VIRTIO_BLK_T_SECURE_ERASE; + break; case REQ_OP_DRV_IN: type = VIRTIO_BLK_T_GET_ID; break; @@ -251,8 +254,9 @@ static blk_status_t virtblk_setup_cmd(struct virtio_device *vdev, vbr->out_hdr.type = cpu_to_virtio32(vdev, type); vbr->out_hdr.ioprio = cpu_to_virtio32(vdev, req_get_ioprio(req)); - if (type == VIRTIO_BLK_T_DISCARD || type == VIRTIO_BLK_T_WRITE_ZEROES) { - if (virtblk_setup_discard_write_zeroes(req, unmap)) + if (type == VIRTIO_BLK_T_DISCARD || type == VIRTIO_BLK_T_WRITE_ZEROES || + type == VIRTIO_BLK_T_SECURE_ERASE) { + if (virtblk_setup_discard_write_zeroes_erase(req, unmap)) return BLK_STS_RESOURCE; } @@ -889,6 +893,8 @@ static int virtblk_probe(struct virtio_device *vdev) int err, index; u32 v, blk_size, max_size, sg_elems, opt_io_size; + u32 max_discard_segs = 0; + u32 discard_granularity = 0; u16 min_io_size; u8 physical_block_exp, alignment_offset; unsigned int queue_depth; @@ -1046,27 +1052,14 @@ static int virtblk_probe(struct virtio_device *vdev) if (virtio_has_feature(vdev, VIRTIO_BLK_F_DISCARD)) { virtio_cread(vdev, struct virtio_blk_config, - discard_sector_alignment, &v); - if (v) - q->limits.discard_granularity = v << SECTOR_SHIFT; - else - q->limits.discard_granularity = blk_size; + discard_sector_alignment, &discard_granularity); virtio_cread(vdev, struct virtio_blk_config, max_discard_sectors, &v); blk_queue_max_discard_sectors(q, v ? v : UINT_MAX); virtio_cread(vdev, struct virtio_blk_config, max_discard_seg, - &v); - - /* - * max_discard_seg == 0 is out of spec but we always - * handled it. - */ - if (!v) - v = sg_elems; - blk_queue_max_discard_segments(q, - min(v, MAX_DISCARD_SEGMENTS)); + &max_discard_segs); } if (virtio_has_feature(vdev, VIRTIO_BLK_F_WRITE_ZEROES)) { @@ -1075,6 +1068,57 @@ static int virtblk_probe(struct virtio_device *vdev) blk_queue_max_write_zeroes_sectors(q, v ? v : UINT_MAX); } + if (virtio_has_feature(vdev, VIRTIO_BLK_F_SECURE_ERASE)) { + /* The discard alignment value should be the minimum between + * secure_erase_sector_alignment and discard_sector_alignment + * (if VIRTIO_BLK_F_DISCARD is negotiated). + */ + virtio_cread(vdev, struct virtio_blk_config, + secure_erase_sector_alignment, &v); + if (v) { + if (discard_granularity) + discard_granularity = min(discard_granularity, v); + else + discard_granularity = v; + } + + virtio_cread(vdev, struct virtio_blk_config, + max_secure_erase_sectors, &v); + blk_queue_max_secure_erase_sectors(q, v ? v : UINT_MAX); + + /* The max discard segments value should be the minimum between + * max_secure_erase_seg and max_discard_seg (if VIRTIO_BLK_F_DISCARD + * is negotiated). + */ + virtio_cread(vdev, struct virtio_blk_config, + max_secure_erase_seg, &v); + if (v) { + if (max_discard_segs) + max_discard_segs = min(max_discard_segs, v); + else + max_discard_segs = v; + } + } + + if (virtio_has_feature(vdev, VIRTIO_BLK_F_DISCARD) || + virtio_has_feature(vdev, VIRTIO_BLK_F_SECURE_ERASE)) { + + /* max_discard_seg == 0 or max_secure_erase_seg == 0 + * are out of spec but we always handled it. + */ + if (!max_discard_segs) + max_discard_segs = sg_elems; + + blk_queue_max_discard_segments(q, + min(max_discard_segs, MAX_DISCARD_SEGMENTS)); + + /* If alignemnt is 0, use block size alignment */ + if (discard_granularity) + q->limits.discard_granularity = discard_granularity << SECTOR_SHIFT; + else + q->limits.discard_granularity = blk_size; + } + virtblk_update_capacity(vblk, false); virtio_device_ready(vdev); @@ -1170,6 +1214,7 @@ static unsigned int features_legacy[] = { VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE, VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES, + VIRTIO_BLK_F_SECURE_ERASE, } ; static unsigned int features[] = { @@ -1177,6 +1222,7 @@ static unsigned int features[] = { VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE, VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES, + VIRTIO_BLK_F_SECURE_ERASE, }; static struct virtio_driver virtio_blk = { diff --git a/include/uapi/linux/virtio_blk.h b/include/uapi/linux/virtio_blk.h index d888f013d9f..58e70b24b50 100644 --- a/include/uapi/linux/virtio_blk.h +++ b/include/uapi/linux/virtio_blk.h @@ -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 -- 2.32.0 _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
