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Re: [PATCH] hw/scsi: Fix sector translation bug in scsi_unmap_complete_n


From: Paolo Bonzini
Subject: Re: [PATCH] hw/scsi: Fix sector translation bug in scsi_unmap_complete_noio
Date: Fri, 21 May 2021 17:20:23 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1

On 21/05/21 16:28, Kit Westneat wrote:
check_lba_range expects sectors to be expressed in original qdev blocksize, but
scsi_unmap_complete_noio was translating them to 512 block sizes, which was
causing sense errors in the larger LBAs in devices using a 4k block size.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/345
Signed-off-by: Kit Westneat <kit.westneat@gmail.com>
---
  hw/scsi/scsi-disk.c | 12 +++++++-----
  1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
index 3580e7ee61..e8a547dbb7 100644
--- a/hw/scsi/scsi-disk.c
+++ b/hw/scsi/scsi-disk.c
@@ -1582,6 +1582,7 @@ invalid_field:
      scsi_check_condition(r, SENSE_CODE(INVALID_FIELD));
  }
+/* sector_num and nb_sectors expected to be in qdev blocksize */
  static inline bool check_lba_range(SCSIDiskState *s,
                                     uint64_t sector_num, uint32_t nb_sectors)
  {
@@ -1614,11 +1615,12 @@ static void scsi_unmap_complete_noio(UnmapCBData *data, 
int ret)
      assert(r->req.aiocb == NULL);
if (data->count > 0) {
-        r->sector = ldq_be_p(&data->inbuf[0])
-            * (s->qdev.blocksize / BDRV_SECTOR_SIZE);
-        r->sector_count = (ldl_be_p(&data->inbuf[8]) & 0xffffffffULL)
-            * (s->qdev.blocksize / BDRV_SECTOR_SIZE);
-        if (!check_lba_range(s, r->sector, r->sector_count)) {
+        uint64_t sector_num = ldq_be_p(&data->inbuf[0]);
+        uint32_t nb_sectors = ldl_be_p(&data->inbuf[8]) & 0xffffffffULL;
+        r->sector = sector_num * (s->qdev.blocksize / BDRV_SECTOR_SIZE);
+        r->sector_count = nb_sectors * (s->qdev.blocksize / BDRV_SECTOR_SIZE);
+
+        if (!check_lba_range(s, sector_num, nb_sectors)) {
              block_acct_invalid(blk_get_stats(s->qdev.conf.blk),
                                 BLOCK_ACCT_UNMAP);
              scsi_check_condition(r, SENSE_CODE(LBA_OUT_OF_RANGE));


Queued, thanks!

If you want to produce a testcase for tests/qtest/virtio-scsi-test.c, I won't complain.

Paolo




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