From: Cornelia Huck <cohuck@redhat.com>
To: Halil Pasic <pasic@linux.ibm.com>
Cc: Pierre Morel <pmorel@linux.vnet.ibm.com>,
Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>,
pasic@linux.vnet.ibm.com, linux-s390@vger.kernel.org,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [PATCH 01/10] vfio: ccw: Moving state change out of IRQ context
Date: Mon, 30 Apr 2018 15:56:16 +0200 [thread overview]
Message-ID: <20180430155616.38529d08.cohuck@redhat.com> (raw)
In-Reply-To: <bf8256f2-17a4-e1ec-ec35-a10bde734b65@linux.ibm.com>
On Wed, 25 Apr 2018 13:06:31 +0200
Halil Pasic <pasic@linux.ibm.com> wrote:
> On 04/25/2018 08:57 AM, Cornelia Huck wrote:
> >> AFAIU this will be the problem of the person implementing the clear
> >> and the halt for vfio-ccw. I.e. it's a non-problem right now.
> > Well, that person is me:) I will post some RFC Real Soon Now if I stop
> > getting sidetracked...
> >
>
> Makes sense. It should be fine either way AFAIU.
>
> CSCH, more precisely the clear function is supposed to clear the
> interruption request(s) too. But I guess there is no way of the CP to
> identify an I/O interrupt that should have been cleared -- that is catch
> us disrespecting the architecture. I can't think of a way to establish
> must happen before relationship...
>
> But discarding the first interrupt and delivering just one for the CSCH
> is fine too for the same reason.
Yes, both work. The calling code in the guest has to be able to handle
both anyway, since both can happen on real hardware as well (with a
smaller race window).
next prev parent reply other threads:[~2018-04-30 13:56 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-19 14:48 [PATCH 00/10] vfio: ccw: Refactoring the VFIO CCW state machine Pierre Morel
2018-04-19 14:48 ` [PATCH 01/10] vfio: ccw: Moving state change out of IRQ context Pierre Morel
[not found] ` <20180424065442.GV12194@bjsdjshi@linux.vnet.ibm.com>
2018-04-24 8:40 ` Pierre Morel
2018-04-24 9:59 ` Cornelia Huck
2018-04-24 11:49 ` Pierre Morel
2018-04-24 11:55 ` Cornelia Huck
2018-04-24 13:07 ` Pierre Morel
2018-04-24 16:42 ` Halil Pasic
2018-04-25 6:57 ` Cornelia Huck
2018-04-25 11:06 ` Halil Pasic
2018-04-30 13:56 ` Cornelia Huck [this message]
2018-04-19 14:48 ` [PATCH 02/10] vfio: ccw: Transform FSM functions to return state Pierre Morel
[not found] ` <20180424072550.GW12194@bjsdjshi@linux.vnet.ibm.com>
2018-04-24 8:22 ` Pierre Morel
2018-04-30 13:58 ` Cornelia Huck
2018-04-19 14:48 ` [PATCH 03/10] vfio: ccw: new SCH_EVENT event Pierre Morel
2018-04-25 8:25 ` Cornelia Huck
2018-04-25 13:54 ` Pierre Morel
[not found] ` <20180426065954.GP5428@bjsdjshi@linux.vnet.ibm.com>
2018-04-30 15:28 ` Cornelia Huck
2018-05-04 8:25 ` Pierre Morel
2018-04-19 14:48 ` [PATCH 04/10] vfio: ccw: replace IO_REQ event with SSCH_REQ event Pierre Morel
2018-04-25 8:41 ` Cornelia Huck
[not found] ` <24f638e4-2f7e-00e1-1efb-ff3fe524bca0@linux.vnet.ibm.com>
2018-04-30 15:30 ` Cornelia Huck
2018-05-03 12:06 ` Pierre Morel
2018-05-22 15:38 ` Cornelia Huck
2018-05-23 8:19 ` Pierre Morel
[not found] ` <20180426073053.GZ12194@bjsdjshi@linux.vnet.ibm.com>
[not found] ` <20180426074806.GB12194@bjsdjshi@linux.vnet.ibm.com>
2018-04-30 15:33 ` Cornelia Huck
[not found] ` <20180502074622.GV5428@bjsdjshi@linux.vnet.ibm.com>
2018-05-02 8:22 ` Cornelia Huck
2018-05-03 14:26 ` Pierre Morel
[not found] ` <20180504011916.GA26081@bjsdjshi@linux.ibm.com>
2018-05-04 11:02 ` Pierre Morel
2018-05-22 15:41 ` Cornelia Huck
2018-05-23 7:50 ` Pierre Morel
2018-05-23 8:10 ` Cornelia Huck
2018-04-19 14:48 ` [PATCH 05/10] vfio: ccw: Suppress unused event parameter Pierre Morel
[not found] ` <20180426073618.GA12194@bjsdjshi@linux.vnet.ibm.com>
2018-05-03 10:34 ` Pierre Morel
2018-04-19 14:48 ` [PATCH 06/10] vfio: ccw: Make FSM functions atomic Pierre Morel
2018-04-19 14:48 ` [PATCH 07/10] vfio: ccw: Introduce the INIT event Pierre Morel
2018-04-30 15:39 ` Cornelia Huck
2018-05-03 10:31 ` Pierre Morel
2018-04-19 14:48 ` [PATCH 08/10] vfio: ccw: Handling reset and shutdown with states Pierre Morel
2018-04-30 15:43 ` Cornelia Huck
2018-04-19 14:48 ` [PATCH 09/10] vfio: ccw: Suppressing the BOXED state Pierre Morel
2018-04-25 8:44 ` Cornelia Huck
2018-04-25 13:55 ` Pierre Morel
2018-04-30 15:47 ` Cornelia Huck
2018-05-03 9:02 ` Pierre Morel
2018-04-19 14:48 ` [PATCH 10/10] vfio: ccw: Let user wait when busy on IO Pierre Morel
2018-04-25 8:48 ` Cornelia Huck
2018-04-25 14:00 ` Pierre Morel
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