From: David Vrabel <david.vrabel@citrix.com>
To: Jan Beulich <JBeulich@suse.com>,
Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Keir Fraser <keir@xen.org>, Tim Deegan <tim@xen.org>,
Xen-devel List <xen-devel@lists.xen.org>
Subject: Re: RFC Userspace hypercalls
Date: Wed, 6 Jan 2016 16:41:18 +0000 [thread overview]
Message-ID: <568D43AE.1030007@citrix.com> (raw)
In-Reply-To: <568D4F6502000078000C418C@prv-mh.provo.novell.com>
On 06/01/16 16:31, Jan Beulich wrote:
>>>> On 06.01.16 at 15:44, <andrew.cooper3@citrix.com> 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?
David
next prev parent reply other threads:[~2016-01-06 16:41 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-06 11:44 RFC Userspace hypercalls Andrew Cooper
2016-01-06 14:14 ` Jan Beulich
2016-01-06 14:44 ` Andrew Cooper
2016-01-06 16:09 ` Jan Beulich
2016-01-06 16:20 ` Andrew Cooper
2016-01-06 16:24 ` Jan Beulich
2016-01-06 16:31 ` Jan Beulich
2016-01-06 16:38 ` Andrew Cooper
2016-01-06 16:49 ` Jan Beulich
2016-01-06 17:06 ` Andrew Cooper
2016-01-06 16:41 ` David Vrabel [this message]
2016-01-07 10:42 ` Ian Campbell
2016-01-07 10:55 ` Andrew Cooper
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