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Re: [Xen-devel] RFC Userspace hypercalls

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 should be done with the evtchn driver.

Even for tests I think it should return to kernel mode to perform
hypercalls.  Tests should not run in a "magic" mode that normal guests
won't use.

If there are failure cases where return to kernel isn't possible and
some logging would be useful, perhaps writing to a memory buffer and
retrieving this via a crash dump would be ok?


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