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

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----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
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