Re: [Xen-devel] RFC Userspace hypercalls

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 06.01.16 at 17:38, <andrew.cooper3@xxxxxxxxxx> wrote:
> On 06/01/16 16:31, Jan Beulich wrote:
>>>>> On 06.01.16 at 15:44, <andrew.cooper3@xxxxxxxxxx> wrote:
>>> We did have an internal request for an HVM guest userspace netfront
>>> driver to be able to use evntchnop calls directly.
>> And this can't be accomplished using the evtchn and/or privcmd
>> drivers?
> 
> It can, and I don't believe the worry about extra overhead is well
> placed.  (There many areas of lower hanging fruit in this specific case).
> 
> However, a userspace backend isn't in principle a bad idea.

Backend? Earlier you said frontend. Nor can I see how using
the evtchn/privcmd devices would preclude that. After all their
purpose is to avoid having to expose hypercalls directly.

Jan


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