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Re: [Xen-devel] [PATCH 1/2] vm_event: sync domctl

  • To: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
  • From: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
  • Date: Wed, 23 Dec 2015 17:41:15 +0200
  • Cc: Wei Liu <wei.liu2@xxxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Ian Campbell <ian.campbell@xxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
  • Comment: DomainKeys? See http://domainkeys.sourceforge.net/
  • Delivery-date: Wed, 23 Dec 2015 15:40:38 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xen.org>

On 12/23/2015 04:53 PM, Tamas K Lengyel wrote:
> Introduce new vm_event domctl option which allows an event subscriber
> to request all vCPUs not currently pending a vm_event request to be paused,
> thus allowing the subscriber to sync up on the state of the domain. This
> is especially useful when the subscribed wants to disable certain events
> from being delivered and wants to ensure no more requests are pending on the
> ring before doing so.
> Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
> Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
> Cc: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
> Signed-off-by: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>

This certainly looks very interesting. Would xc_domain_pause() not be
enough for your use case then?


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