Red Hat Bugzilla – Bug 903910
RHEL7 does not have equivalent functionality for __com.redhat_qxl_screendump
Last modified: 2018-03-05 00:48:13 EST
Description of problem: KVM QE compared the list of cmd line and devices difference between rhel6.4 and rhel7.0. Found lot of vnc and spice related commands are different. From KVM QE POV, RHEL7 vnc & spice related commands result should much closer RHEL not upstream. Display options -vnc & -spice RHEL6.4 __com.redhat_set_password(set password for vnc or spice) __com.redhat_qxl_screendump(save screen from qxl device 'id' into PPM image 'filename') __com.redhat_spice_migrate_info(send migration info to spice client) RHEL7.0 set_password(set password for vnc or spice) no command for saving screen from qxl device 'id' into PPM image 'filename' client_migrate_info(send migration info to spice client) Version-Release number of selected component (if applicable): Host Kernel #uname -r 3.7.0-0.30.el7.x86_64 qemu-kvm version qemu-kvm-1.3.0-3.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1. 2. 3. Actual results: Display options -vnc & -spice RHEL6.4 __com.redhat_set_password(set password for vnc or spice) __com.redhat_qxl_screendump(save screen from qxl device 'id' into PPM image 'filename') __com.redhat_spice_migrate_info(send migration info to spice client) RHEL7.0 set_password(set password for vnc or spice) no command for saving screen from qxl device 'id' into PPM image 'filename' client_migrate_info(send migration info to spice client) Expected results: RHEL7 vnc & spice related commands result should much closer RHEL not upstream Additional info:
RHEL-6 has the upstream commands (set_password, client_migrate_info) too. They should be prefered even on RHEL-6. They will not be forward-ported to RHEL-7. Bringing __com.redhat_qxl_screendump to RHEL-7 is a valid request though as upstream has no command for that (yet?).
Status update: __com.redhat_qxl_screendump will not come back in rhel-7. qemu console subsystem gets reworked upstream, screen dumps from any gfx device will be possible when done, no need for a special qxl hack. First chunk of patches is merged, /me hopes to get it finished in time for qemu 1.5. Not clear yet how the interface will look like, probably the normal screendump monitor command gets an optional parameter.
Status update: qemu console subsystem rewrite is in 1.5, screendump monitor command update didn't made it and will be defered to 1.6. So I'll go backport the new/updated upstream monitor command once merged upstream. Failing that there is the fallback option to reimplement __com.redhat_qxl_screendump on rhel-7 (should be easy on top of the console subsystem rewrite).
Created attachment 783834 [details] The ppm image got from __com.redhat_qxl_screendump
Fix included in qemu-kvm-1.5.2-4.el7
Created attachment 788727 [details] Successfully get the ppm image via __com.redhat_qxl_screendump by qemu-kvm1.5.4
I'm afraid the backport lost command documentation. RHEL-6 has it in qemu-monitor.hx. RHEL-7 needs it in qmp-commands.hx. Without it, the command isn't documented in qemu-doc.{info,html}.
Err, make that qemu-doc.html. We don't actually ship qemu-doc.info. Add qmp-commands.txt. Command is missing there in RHEL-6.
Created attachment 834887 [details] Proposed documentation patch
Fix included in qemu-kvm-1.5.3-36.el7
Reproduced this bug. Host: qemu-kvm-1.3.0-3.el7.x86_64 ipxe-roms-qemu-20130517-2.gitc4bce43.el7.noarch qemu-img-1.3.0-3.el7.x86_64 qemu-kvm-tools-1.3.0-3.el7.x86_64 qemu-kvm-common-1.3.0-3.el7.x86_64 qemu-kvm-debuginfo-1.3.0-3.el7.x86_64 kernel-3.7.0-0.36.el7.x86_64 Result: Not found command "__com.redhat_qxl_screendump" {"QMP": {"version": {"qemu": {"micro": 0, "minor": 3, "major": 1}, "package": ""}, "capabilities": []}} {"execute":"qmp_capabilities"} {"return": {}} {"execute": "query-commands"} {"return": [{"name": "query-target"}, {"name": "query-cpu-definitions"}, {"name": "query-machines"}, {"name": "device-list-properties"}, {"name": "qom-list-types"}, {"name": "change-vnc-password"}, {"name": "nbd-server-stop"}, {"name": "nbd-server-add"}, {"name": "nbd-server-start"}, {"name": "qom-get"}, {"name": "qom-set"}, {"name": "qom-list"}, {"name": "query-block-jobs"}, {"name": "query-balloon"}, {"name": "query-migrate-capabilities"}, {"name": "migrate-set-capabilities"}, {"name": "query-migrate"}, {"name": "query-uuid"}, {"name": "query-name"}, {"name": "query-spice"}, {"name": "query-vnc"}, {"name": "query-mice"}, {"name": "query-status"}, {"name": "query-kvm"}, {"name": "query-pci"}, {"name": "query-cpus"}, {"name": "query-blockstats"}, {"name": "query-block"}, {"name": "query-chardev"}, {"name": "query-events"}, {"name": "query-commands"}, {"name": "query-version"}, {"name": "human-monitor-command"}, {"name": "qmp_capabilities"}, {"name": "add_client"}, {"name": "expire_password"}, {"name": "set_password"}, {"name": "block_set_io_throttle"}, {"name": "block_passwd"}, {"name": "query-fdsets"}, {"name": "remove-fd"}, {"name": "add-fd"}, {"name": "closefd"}, {"name": "getfd"}, {"name": "set_link"}, {"name": "balloon"}, {"name": "drive-mirror"}, {"name": "blockdev-snapshot-sync"}, {"name": "transaction"}, {"name": "block-job-complete"}, {"name": "block-job-resume"}, {"name": "block-job-pause"}, {"name": "block-job-cancel"}, {"name": "block-job-set-speed"}, {"name": "block-commit"}, {"name": "block-stream"}, {"name": "block_resize"}, {"name": "netdev_del"}, {"name": "netdev_add"}, {"name": "dump-guest-memory"}, {"name": "client_migrate_info"}, {"name": "migrate_set_downtime"}, {"name": "migrate_set_speed"}, {"name": "query-migrate-cache-size"}, {"name": "migrate-set-cache-size"}, {"name": "migrate_cancel"}, {"name": "migrate"}, {"name": "xen-set-global-dirty-log"}, {"name": "xen-save-devices-state"}, {"name": "inject-nmi"}, {"name": "pmemsave"}, {"name": "memsave"}, {"name": "cpu"}, {"name": "send-key"}, {"name": "device_del"}, {"name": "device_add"}, {"name": "system_powerdown"}, {"name": "system_reset"}, {"name": "system_wakeup"}, {"name": "cont"}, {"name": "stop"}, {"name": "screendump"}, {"name": "change"}, {"name": "eject"}, {"name": "quit"}]} Verified this bug with qemu-kvm-1.5.3-38.el7.x86_64. Result: {"QMP": {"version": {"qemu": {"micro": 3, "minor": 5, "major": 1}, "package": " (qemu-kvm-1.5.3-38.el7)"}, "capabilities": []}} {"execute":"qmp_capabilities"} {"return": {}} {"execute":"__com.redhat_qxl_screendump","arguments":{"id":"video1","filename":"v1.ppm"}} {"return": {}} # ll v1.ppm -rw-r--r--. 1 root root 921615 Jan 21 16:48 v1.ppm So this bug has been fixed.
This request was resolved in Red Hat Enterprise Linux 7.0. Contact your manager or support representative in case you have further questions about the request.