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Re: [PATCH] Revert "evtchn: refuse EVTCHNOP_status for Xen-bound event channels"


  • To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Wed, 3 Apr 2024 08:52:21 +0200
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  • Cc: George Dunlap <George.Dunlap@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Daniel Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Wed, 03 Apr 2024 06:52:50 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 03.04.2024 08:16, Jan Beulich wrote:
> On 02.04.2024 19:06, Andrew Cooper wrote:
>> Whether to return information about a xen-owned evtchn is a matter of policy,
>> and it's not acceptable to short circuit the XSM on the matter.
> 
> I can certainly accept this as one possible view point. As in so many cases
> I'm afraid I dislike you putting it as if it was the only possible one.

Further to this: Is there even a way to express the same denial in XSM?
alloc_unbound_xen_event_channel() doesn't specifically "mark" such a
channel, and (yes, it could in principle be open-coded in Flask code)
consumer_is_xen() is private to event_channel.c. I also dare to question
whether in SILO mode status information like this should be available.

Jan



 


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