Re: [Xen-devel] [RFC PATCH 4/6] vm_event: Use slotted channels for sync requests.

[Petre Ovidiu PIRCALABU <ppircalabu@xxxxxxxxxxxxxxx>]

On Thu, 2018-12-20 at 12:05 +0000, Paul Durrant wrote:
> > The memory for the asynchronous ring and the synchronous channels
> > will
> > be allocated from domheap and mapped to the controlling domain
> > using the
> > foreignmemory_map_resource interface. Unlike the current
> > implementation,
> > the allocated pages are not part of the target DomU, so they will
> > not be
> > reclaimed when the vm_event domain is disabled.
> 
> Why re-invent the wheel here? The ioreq infrastructure already does
> pretty much everything you need AFAICT.
> 
>   Paul

I wanted preseve as much as possible from the existing vm_event DOMCTL
interface and add only the necessary code to allocate and map the
vm_event_pages.
Also, to my knowledge, the ioreq server is only supported for x86 hvm
targets. I didn't want to add an extra limitation to the vm_event
system.
//Petre

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