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Re: [Xen-devel] [PATCH v2 07/10] vm_event: Add vm_event_ng interface
- To: Jan Beulich <JBeulich@xxxxxxxx>, Paul Durrant <Paul.Durrant@xxxxxxxxxx>, Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
- From: Petre Ovidiu PIRCALABU <ppircalabu@xxxxxxxxxxxxxxx>
- Date: Fri, 19 Jul 2019 17:40:02 +0000
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- Thread-topic: [PATCH v2 07/10] vm_event: Add vm_event_ng interface
On Fri, 2019-07-19 at 12:59 +0000, Jan Beulich wrote:
> On 19.07.2019 14:37, Paul Durrant wrote:
> > > From: Jan Beulich <JBeulich@xxxxxxxx>
> > > Sent: 19 July 2019 13:32
> > >
> > > On 19.07.2019 14:11, Paul Durrant wrote:
> > > > > -----Original Message-----
> > > > > From: Petre Ovidiu PIRCALABU <ppircalabu@xxxxxxxxxxxxxxx>
> > > > > Sent: 19 July 2019 12:24
> > > > >
> > > > > Sorry, my mistake. I meant to say it's shared with MD.
> > > > >
> > > > > Many thanks for your support,
> > > >
> > > > Ok, in that case please share with the ID instead.
> > >
> > > But that's exactly what we want to avoid: If sharing at all, then
> > > please with the more privileged entity.
> >
> > Why? We're talking HVM guests only here IIUC so this is equivalent
> > to IOREQ server...
>
> Not sure: The main vm_event.c files live in common/ and arch/x86/
> respectively, so I thought at least architecturally VM events were
> possible for PV as well. If it's indeed HVM-only, then following
> the IOREQ server model in its entirety would of course be fine.
>
> Jan
In one of the previous version of the patchset there was a suggestion
to implement the new vm_event transport using IOREQ, but it was dropped
.
https://lists.xenproject.org/archives/html/xen-devel/2019-04/msg00173.html
Also, unless there isn't a proper way allocate the necessary pages, I
wouldn't introduce a HVM-only limitation because, other than the HVM
param used to keep track of the ring pfn, the vm_event mechanism is
quite generic.
Many thanks for your support,
Petre
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