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[PATCH v3 09/12] block/export: fix vhost-user-blk export sector number c

From: Stefan Hajnoczi
Subject: [PATCH v3 09/12] block/export: fix vhost-user-blk export sector number calculation
Date: Tue, 23 Feb 2021 14:46:50 +0000

The driver is supposed to honor the blk_size field but the protocol
still uses 512-byte sector numbers. It is incorrect to multiply
req->sector_num by blk_size.

VIRTIO 1.1 5.2.5 Device Initialization says:

  blk_size can be read to determine the optimal sector size for the
  driver to use. This does not affect the units used in the protocol
  (always 512 bytes), but awareness of the correct value can affect

Fixes: 3578389bcf76c824a5d82e6586a6f0c71e56f2aa ("block/export: vhost-user 
block device backend server")
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
 block/export/vhost-user-blk-server.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/export/vhost-user-blk-server.c 
index 2614a63791..f74796241c 100644
--- a/block/export/vhost-user-blk-server.c
+++ b/block/export/vhost-user-blk-server.c
@@ -144,7 +144,7 @@ static void coroutine_fn vu_blk_virtio_process_req(void 
-        int64_t offset = req->sector_num * vexp->blk_size;
+        int64_t offset = req->sector_num << VIRTIO_BLK_SECTOR_BITS;
         QEMUIOVector qiov;
         if (is_write) {
             qemu_iovec_init_external(&qiov, out_iov, out_num);

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