Re: [libvirt] [PATCHv9.5 1/2] blockjob: add qemu capabilities related to block jobs

Upstream qemu 1.3 is adding two new monitor commands, 'drive-mirror' and 'block-job-complete'[1], which can drive live block copy and storage migration. [Additionally, RHEL 6.3 had backported an earlier version of most of the same functionality, but under the names '__com.redhat_drive-mirror' and '__com.redhat_drive-reopen' and with slightly different JSON arguments, and has been using patches similar to these upstream patches for several months now.] The libvirt API virDomainBlockRebase as already committed for 0.9.12 is flexible enough to expose the basics of block copy, but some additional features in the 'drive-mirror' qemu command, such as setting error policy, setting granularity, or using a persistent bitmap, may later require a new libvirt API virDomainBlockCopy. I will wait to add that API until we know more about what qemu 1.3 will finally provide. This patch caters only to the upstream qemu 1.3 interface, although I have proven that the changes for RHEL 6.3 can be isolated to just qemu_monitor_json.c, and the rest of this series will gracefully handle either interface once the JSON differences are papered over in a downstream patch. For consistency with other block job commands, libvirt must handle the bandwidth argument as MiB/sec from the user, even though qemu exposes the speed argument as bytes/sec; then again, qemu rounds up to cluster size internally, so using MiB hides the worst effects of that rounding if you pass small numbers. [1]https://lists.gnu.org/archive/html/qemu-devel/2012-10/msg04123.html * src/qemu/qemu_capabilities.h (QEMU_CAPS_DRIVE_MIRROR) (QEMU_CAPS_DRIVE_REOPEN): New bits. * src/qemu/qemu_capabilities.c (qemuCaps): Name them. * src/qemu/qemu_monitor_json.c (qemuMonitorJSONCheckCommands): Set them. (qemuMonitorJSONDriveMirror, qemuMonitorDrivePivot): New functions. * src/qemu/qemu_monitor_json.h (qemuMonitorJSONDriveMirror) (qemuMonitorDrivePivot): Declare them. * src/qemu/qemu_monitor.c (qemuMonitorDriveMirror) (qemuMonitorDrivePivot): New passthroughs. * src/qemu/qemu_monitor.h (qemuMonitorDriveMirror) (qemuMonitorDrivePivot): Declare them. --- v9.5: Update the commit message to point to Kevin's PULL request (we're one step closer to having drive-mirror in upstream qemu.git, and a PULL request means the interface is now stable). Drop consideration for RHEL 6.3, by dropping the 'bool reopen' parameter; later patches in the series will trivially rebase that part out. src/qemu/qemu_capabilities.c | 4 +++ src/qemu/qemu_capabilities.h | 1 + src/qemu/qemu_monitor.c | 56 +++++++++++++++++++++++++++++++++++++++-- src/qemu/qemu_monitor.h | 12 +++++++++ src/qemu/qemu_monitor_json.c | 60 ++++++++++++++++++++++++++++++++++++++++++++ src/qemu/qemu_monitor_json.h | 19 ++++++++++++-- 6 files changed, 148 insertions(+), 4 deletions(-)