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Re: [Qemu-devel] [libvirt] qapi DEVICE_DELETED event issued *before* ins
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [libvirt] qapi DEVICE_DELETED event issued *before* instance_finalize?! |
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Date: |
Tue, 6 Sep 2016 16:26:45 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 |
On 06/09/2016 16:02, Laine Stump wrote:
>>>
>> It seems like this is just pointing out another flaw in the semantics
>> of DEVICE_DELETED, a device can linger without a device id, so there's
>> no way to reference it via QMP.
>
> Ah, right. I hadn't caught that. Yeah, since it's the device id that's
> used to keep track of which device the event is for, then it seems
> impossible to have an event that's issued after the device id is already
> recycled.
If a device lingers for more than say a second (most likely less---what
you're looking for is one or two synchronize_rcu cycles), it would be a
bug in QEMU.
Paolo