From 37c51741892a89cf5710f5ac231091fb0a6352c7 Mon Sep 17 00:00:00 2001 From: Fam Zheng Date: Wed, 28 Mar 2018 00:41:41 +0800 Subject: [PATCH] scsi-disk: Don't enlarge min_io_size to max_io_size 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 Signed-off-by: Fam Zheng Message-Id: <20180327164141.19075-1-famz@redhat.com> Signed-off-by: Paolo Bonzini --- hw/scsi/scsi-disk.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c index f5ab767ab5..f8ed8cf2b4 100644 --- a/hw/scsi/scsi-disk.c +++ b/hw/scsi/scsi-disk.c @@ -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; -- 2.11.4.GIT