Re: [Xen-devel] [PATCH v4 5/8] arm/vm_event: get/set registers

[Tamas K Lengyel <tamas@xxxxxxxxxxxxx>]

On Mon, May 30, 2016 at 2:46 PM, Razvan Cojocaru
<rcojocaru@xxxxxxxxxxxxxxx> wrote:
> On 05/30/16 23:37, Tamas K Lengyel wrote:
>> Well, as we discussed it in the previous revision, there is no
>> hard-set rule of what can and cannot be transmitted here. The only
>> thing to keep in mind is to not grow this struct to be too large. The
>> registers sent right now represent a "best guess" of what may be
>> useful for performance-sensitive vm_event applications on ARM. It can
>> be adjusted in the future if applications require other registers.
>
> Obviously I agree with Tamas here, my only comment would be that in my
> humble opinion multipage vm_event ring buffers are probably the way to
> go in the long run. I'm not sure if other parts of Xen already employ
> such devices (or if indeed there's support for this at all at this
> time), but this might be something worth looking into.
>
> Again, this does not imply that there's anything wrong with this patch
> or that this is an issue this series should address.

Yeap, something ackin to libvchan would be very handy to have for
guest-hypervisor communication as well. I recall it popping up on the
mailinglist before, not sure if there was any consensus on it in the
end.

Tamas

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