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Re: [Xen-devel] [PATCH v2 07/10] vm_event: Add vm_event_ng interface
- To: Petre Ovidiu PIRCALABU <ppircalabu@xxxxxxxxxxxxxxx>, Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>, Paul Durrant <Paul.Durrant@xxxxxxxxxx>
- From: Jan Beulich <JBeulich@xxxxxxxx>
- Date: Mon, 22 Jul 2019 07:59:20 +0000
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- Thread-topic: [PATCH v2 07/10] vm_event: Add vm_event_ng interface
On 19.07.2019 19:40, Petre Ovidiu PIRCALABU wrote:
> 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.
>
> 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
And validly so (imo), not the least because of also being HVM specific.
> 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.
By "wouldn't introduce" do you mean "wouldn't want to introduce" or do
you mean to say you in fact wouldn't and I'm not seeing why that is?
Jan
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