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scsi-disk: Don't enlarge min_io_size to max_io_size

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Some backends report big max_io_sectors. Making min_io_size the same
value in this case will make it impossible for guest to align memory,
therefore the disk may not be usable at all.

Do not enlarge them when they are zero.

Reported-by: David Gibson <dgibson@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>

Message-Id: <20180327164141.19075-1-famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Fam Zheng 2018-03-28 00:41:41 +08:00 committed by Paolo Bonzini
parent db1b5f135c
commit 37c5174189
1 changed files with 6 additions and 4 deletions
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10
hw/scsi/scsi-disk.c
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@ -714,10 +714,12 @@ static int scsi_disk_emulate_inquiry(SCSIRequest *req, uint8_t *outbuf)
/* min_io_size and opt_io_size can't be greater than
* max_io_sectors */
min_io_size =
MIN_NON_ZERO(min_io_size, max_io_sectors);
opt_io_size =
MIN_NON_ZERO(opt_io_size, max_io_sectors);
if (min_io_size) {
min_io_size = MIN(min_io_size, max_io_sectors);
}
if (opt_io_size) {
opt_io_size = MIN(opt_io_size, max_io_sectors);
}
}
/* required VPD size with unmap support */
buflen = 0x40;