Re: [libvirt] [Qemu-devel] [PATCH v2] hmp: allow cpu index for "info lapic"
[adding libvirt]
On 07/19/2017 07:41 AM, Eduardo Habkost wrote:
> virsh qemu-monitor-command --domain rhel6.8 --hmp --cmd
"cpu 1"
> virsh qemu-monitor-command --domain rhel6.8 --hmp --cmd "info lapic"
> dumping local APIC state for CPU 0
Right, the "cpu" command is useless inside a
'human-monitor-command' QMP command. The 'cpu-index' argument
should be used instead. should make "cpu" print an error if ran
inside 'human-monitor-command' instead of silently pretend it
worked.
If virsh doesn't support the 'cpu-index' argument to
'human-monitor-command',
It doesn't. Perhaps we should add that as a future libvirt-qemu.so API
addition, although it's probably easier to just use QMP than HMP when
using 'virsh qemu-monitor-command' if HMP doesn't do what you want.
it's possible to work around that
limitation by building your own QMP command. e.g.:
# virsh qemu-monitor-command f26test
'{"execute":"human-monitor-command",
"arguments":{"command-line":"info lapic",
"cpu-index":1}}' | jq -r '.return'
Indeed, there's the use of QMP to work around the HMP deficiency.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
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