scsi: support NDOB (no data-out buffer) for WRITE SAME commands

A NDOB bit set to one specifies that the disk shall not transfer data
from the data-out buffer and shall process the command as if the data-out
buffer contained user data set to all zeroes.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/tests/virtio-scsi-test.c b/tests/virtio-scsi-test.c
index 7393d69bb2..037872bb98 100644
--- a/tests/virtio-scsi-test.c
+++ b/tests/virtio-scsi-test.c
@@ -216,6 +216,9 @@ static void test_unaligned_write_same(void)
     const uint8_t write_same_cdb_2[VIRTIO_SCSI_CDB_SIZE] = {
         0x41, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x33, 0x00, 0x00
     };
+    const uint8_t write_same_cdb_ndob[VIRTIO_SCSI_CDB_SIZE] = {
+        0x41, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x33, 0x00, 0x00
+    };
 
     vs = qvirtio_scsi_pci_init(PCI_SLOT);
 
@@ -225,6 +228,9 @@ static void test_unaligned_write_same(void)
     g_assert_cmphex(0, ==,
         virtio_scsi_do_command(vs, write_same_cdb_2, NULL, 0, buf2, 512, NULL));
 
+    g_assert_cmphex(0, ==,
+        virtio_scsi_do_command(vs, write_same_cdb_ndob, NULL, 0, NULL, 0, NULL));
+
     qvirtio_scsi_pci_free(vs);
 }