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docs: drvqemu: Decrease expectations about command line from 'virsh domxml-to-native'

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In the qemu driver certain configs such as disk throttling or CPU
hotplug is configured by interacting with the monitor at the startup
phase of the hypervisor and thus is not part of the "native config".

Add a paragraph into the documentation outlining that the native
configuration might not be completely usable.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
This commit is contained in:
Peter Krempa 2022-05-16 13:03:24 +02:00
parent 6272e780e2
commit 5b9c880e89
1 changed files with 10 additions and 4 deletions
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docs/drvqemu.rst
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@ -443,10 +443,16 @@ Converting from domain XML to QEMU args
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The ``virsh domxml-to-native`` provides a way to convert a guest description
using libvirt Domain XML, into a set of QEMU args that can be run manually. Note
that currently the command line formatted by libvirt is no longer suited for
manually running qemu as the configuration expects various resources and open
file descriptors passed to the process which are usually prepared by libvirtd.
using libvirt Domain XML, into a set of QEMU args that would be used by libvirt
to start the qemu process.
Note that currently the command line formatted by libvirt is no longer suited
for manually running qemu as the configuration expects various resources and
open file descriptors passed to the process which are usually prepared by
libvirtd as well as certain features being configured via the monitor.
The qemu arguments as returned by ``virsh domxml-to-native`` thus are not
trivially usable outside of libvirt.
Pass-through of arbitrary qemu commands
---------------------------------------