Avoid regressions by disallowing the BLOCKDEV capability.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
---
 src/qemu/qemu_capabilities.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 4ed995d59f..09d48282a5 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -4332,6 +4332,11 @@ virQEMUCapsInitQMPMonitor(virQEMUCapsPtr qemuCaps,
             virQEMUCapsClear(qemuCaps, QEMU_CAPS_SEV_GUEST);
     }

+    /* To avoid guest ABI regression, blockdev shall be enabled only when
+     * we are able to pass the custom 'device_id' for SCSI disks and cdroms. */
+    if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_SCSI_DISK_DEVICE_ID))
+        virQEMUCapsClear(qemuCaps, QEMU_CAPS_BLOCKDEV);
+
     ret = 0;
  cleanup:
     return ret;
-- 
2.20.1

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