Re: [Xen-devel] [PATCH] common/vm_event: Initialize vm_event lists on domain creation

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 26/06/17 12:39, Konrad Rzeszutek Wilk wrote:
> On June 26, 2017 5:48:17 AM EDT, Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx> 
> wrote:
>> Pending livepatch code wants to check if the vm_event wait queues
>> are active, and this is made harder by the fact that they were
>
> Hmm, it wants to? Is there an missing patch that hasn't been posted for this?
>
> If you mean to post this _before_ the other one please adjust the commit 
> description.

I was intending patch is only for XenServer.  Its a stopgap solution to
prevent livepatching from crashing the hypervisor if there are active
waitqueues.

The longterm solution is to get multipage rings working (so there are
guaranteed to be sufficient slots not to block) and drop waitqueues
entirely.  In the short term however, I suppose a variant of it might be
useful, depending on how supported vm_event actually is.


Razvan: I'd reword this to not mention livepatching.  Simply having
list_empty() working is a good enough reason alone.

~Andrew

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