Re: [libvirt] [BUG] When PLUG a bridge interface to an active VM, the generated LIVE and CONFIG mac address are different
On Tue, Aug 27, 2019 at 02:13:28PM +0200, Michal Privoznik wrote:
On 8/22/19 10:43 AM, Xu Yandong (Yandong Xu) wrote:
>Hi,
>
>When plug a bridge interface to an active VM with both LIVE AND CONFIG flags,
>libvirt generate different mac address to LIVE and CONFIG instance, so After
>I reboot the VM, DHCP server doesn't assign the same IP address to the new
>bridge interface.
>
This is kind of expected. In general, live and inactive XMLs can be
significantly different.
Well, if the live and inactive XMLs have sufficiently diverged, then
I don't see the point of calling AttachDevice with both AFFECT_LIVE and
AFFECT_CONFIG - you might as well use two different API calls.
However for a guest with the definitions in sync, quietly accepting a
both flags while attaching a device with different MAC addresses (so
essentially two different devices) feels wrong.
And I guess it's out of libvirt's scope to
try and autofill missing data in such way that fits both libe and
inactive XMLs. For instance, a PCI address can be taken/free in live
XML because of hotplug/hotunplug but that might not be the case for
inactive XML. Should libvirt try and find a slot that suits both XMLs?
That possibly might be out of scope, but autofilling the mac address as
early as virDomainNetDefParseXML also is not ideal.
Jano
Michal
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