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Re: [libvirt] [Qemu-devel] [PATCH] qdev: DEVICE_DELETED event



Eric Blake <eblake redhat com> writes:

> [adding libvirt]
>
> On 03/06/2013 07:52 AM, Paolo Bonzini wrote:
>> Il 06/03/2013 15:44, Eric Blake ha scritto:
>>> Question - if libvirt misses the event (for example, if libvirtd
>>> requests a remove, but then gets restarted, and the event arrives before
>>> libvirtd is back up), is there a way to poll whether the the removal has
>>> completed?  The event is great to minimize polling overhead in the
>>> common case, but we generally provide this sort of information via a
>>> pollable interface at the same time.

General rule: no event without a way to poll.

>> Yes, you can use qom-list on /machine/peripheral.
>
> Which means libvirt should be patched to use qom-list right now, even
> before this event makes it in, in order to avoid its current bug of
> reusing a device id before the deletion has completed.  Adding the event
> is still useful, as polling is never nice; and we already know how to
> make libvirt do conditional code based on whether query-events shows
> that the event has been added to minimize polling where possible.

Yes.


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