Re: [Xen-devel] [PATCH v2 07/10] vm_event: Add vm_event_ng interface

[Petre Ovidiu PIRCALABU <ppircalabu@xxxxxxxxxxxxxxx>]

On Fri, 2019-07-19 at 08:26 +0000, Paul Durrant wrote:
> > -----Original Message-----
> > From: Jan Beulich <JBeulich@xxxxxxxx>
> > Sent: 19 July 2019 09:22
> > To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>
> > Cc: 'Petre Ovidiu PIRCALABU' <ppircalabu@xxxxxxxxxxxxxxx>;
> > JulienGrall <julien.grall@xxxxxxx>;
> > Alexandru Stefan ISAILA <aisaila@xxxxxxxxxxxxxxx>; Razvan Cojocaru
> > <rcojocaru@xxxxxxxxxxxxxxx>; Andrew
> > Cooper <Andrew.Cooper3@xxxxxxxxxx>; George Dunlap <
> > George.Dunlap@xxxxxxxxxx>; Ian Jackson
> > <Ian.Jackson@xxxxxxxxxx>; Roger Pau Monne <roger.pau@xxxxxxxxxx>;
> > Stefano Stabellini
> > <sstabellini@xxxxxxxxxx>; xen-devel@xxxxxxxxxxxxxxxxxxxx;
> > KonradRzeszutek Wilk
> > <konrad.wilk@xxxxxxxxxx>; Tamas K Lengyel <tamas@xxxxxxxxxxxxx>;
> > Tim (Xen.org) <tim@xxxxxxx>; Wei Liu
> > <wl@xxxxxxx>
> > Subject: Re: [PATCH v2 07/10] vm_event: Add vm_event_ng interface
> > 
> > On 19.07.2019 09:56, Paul Durrant wrote:
> > > > From: Petre Ovidiu PIRCALABU <ppircalabu@xxxxxxxxxxxxxxx>
> > > > Sent: 18 July 2019 14:59
> > > > 
> > > > So, at this point the most promising solution is allocating the
> > > > memory
> > > > in XEN, sharing it with ID using share_xen_page_with_guest, and
> > > > mapping
> > > > it with xenforeignmemory_map_resource (with the flag
> > > > XENMEM_rsrc_acq_caller_owned set)
> > > 
> > > If that page is shared with the ID then
> > > XENMEM_rsrc_acq_caller_owned
> > > should *not* be set. Also, that flag is an 'out' flag... the
> > > caller
> > > doesn't decide who owns the resource.
> > 
> > I had implied that it's really MD that's meant here, but maybe I
> > was
> > wrong doing so.
> > 
> > > TBH I regret ever introducing the flag; it caused a lot of
> > > problems,
> > > which is why it is no longer used.
> > 
> > It's a tools only interface - why don't we drop the flag if you now
> > think it was a bad idea to introduce it?
> 
> I was indeed thinking I should find enough tuits to do that in the
> near future.
> 
>   Paul
> 
> > 
> > Jan
Sorry, my mistake. I meant to say it's shared with MD. 

Many thanks for your support,
Petre

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