https://bugzilla.redhat.com/show_bug.cgi?id=1140981 reports that
the qemu-kvm shipped as part of RHEL 7.0 intentionally cripples
block jobs by removing the 'block-stream' QMP command, but that
our probe for whether block jobs work was merely whether
'block-job-cancel' exists. Meanwhile, older qemu spelled the
two commands block_stream and block_job_cancel. We know of no
qemu build that has block-stream while lacking block-job-cancel,
so it is easiest to change our witness to the command that
starts a job rather than ends one. On RHEL, this results in
changing the message from an ugly:
error: Requested operation is not valid: Command 'block-stream' is not found
to a nicer:
error: unsupported configuration: block jobs not supported with this qemu binary
* src/qemu/qemu_capabilities.h (QEMU_CAPS_BLOCKJOB_SYNC): Tweak comment.
* src/qemu/qemu_capabilities.c (virQEMUCapsCommands): Look for stream
rather than cancel when determining the flavor of block jobs supported.
Signed-off-by: Eric Blake <eblake(a)redhat.com>
---
src/qemu/qemu_capabilities.c | 4 ++--
src/qemu/qemu_capabilities.h | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 6fcb5c7..b6c0f1b 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -1422,8 +1422,8 @@ struct virQEMUCapsStringFlags {
struct virQEMUCapsStringFlags virQEMUCapsCommands[] = {
{ "system_wakeup", QEMU_CAPS_WAKEUP },
{ "transaction", QEMU_CAPS_TRANSACTION },
- { "block_job_cancel", QEMU_CAPS_BLOCKJOB_SYNC },
- { "block-job-cancel", QEMU_CAPS_BLOCKJOB_ASYNC },
+ { "block_stream", QEMU_CAPS_BLOCKJOB_SYNC },
+ { "block-stream", QEMU_CAPS_BLOCKJOB_ASYNC },
{ "dump-guest-memory", QEMU_CAPS_DUMP_GUEST_MEMORY },
{ "query-spice", QEMU_CAPS_SPICE },
{ "query-kvm", QEMU_CAPS_KVM },
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 0214f30..c0e2172 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -127,8 +127,8 @@ typedef enum {
QEMU_CAPS_SCSI_DISK_CHANNEL = 87, /* Is scsi-disk.channel available? */
QEMU_CAPS_SCSI_BLOCK = 88, /* -device scsi-block */
QEMU_CAPS_TRANSACTION = 89, /* transaction monitor command */
- QEMU_CAPS_BLOCKJOB_SYNC = 90, /* RHEL 6.2 block_job_cancel */
- QEMU_CAPS_BLOCKJOB_ASYNC = 91, /* qemu 1.1 block-job-cancel */
+ QEMU_CAPS_BLOCKJOB_SYNC = 90, /* old block_job_cancel, block_stream */
+ QEMU_CAPS_BLOCKJOB_ASYNC = 91, /* new block-job-cancel, block-stream */
QEMU_CAPS_SCSI_CD = 92, /* -device scsi-cd */
QEMU_CAPS_IDE_CD = 93, /* -device ide-cd */
QEMU_CAPS_NO_USER_CONFIG = 94, /* -no-user-config */
--
1.9.3