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Re: [libvirt] [PATCH 3/5] qemu: add QEMU_CAPS_MACHINE_VMPORT_OPT


On Tue, Apr 14, 2015 at 6:07 PM, Eric Blake <eblake redhat com> wrote:
> +    { "machine", "vmport", QEMU_CAPS_MACHINE_VMPORT_OPT },

Ouch.  qemu commit 0a7cf21 fixes what would have been a regression in
2.3 at exposing "mem-merge" through query-command-line-options, but it
does NOT expose "vmport", which is a per-architecture option rather than
a generic -machine option.  Which means that even though qemu 2.2
(perhaps wrongly) advertised "vmport" for all machines (even when it was
not supported), 2.3 will not advertise it, and we are hoping for a
better solution in 2.4 for properly advertising vmport on an
as-appropriate basis.

Thanks Eric for finding out this regression.

Is anybody working on a better solution? I can imagine either a new qmp machine-list-properties, or perhaps more reasonably a new properties array in query-machines reply.

Marc-André Lureau

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