From: Cornelia Huck <cohuck@redhat.com>
To: Halil Pasic <pasic@linux.ibm.com>
Cc: linux-s390@vger.kernel.org, Eric Farman <farman@linux.ibm.com>,
Alex Williamson <alex.williamson@redhat.com>,
Pierre Morel <pmorel@linux.ibm.com>,
kvm@vger.kernel.org, Farhan Ali <alifm@linux.ibm.com>,
qemu-devel@nongnu.org, qemu-s390x@nongnu.org
Subject: Re: [Qemu-devel] [PATCH v2 2/5] vfio-ccw: concurrent I/O handling
Date: Mon, 28 Jan 2019 18:13:55 +0100 [thread overview]
Message-ID: <20190128181355.2d79cae7.cohuck@redhat.com> (raw)
In-Reply-To: <20190125170404.28c61eab@oc2783563651>
On Fri, 25 Jan 2019 17:04:04 +0100
Halil Pasic <pasic@linux.ibm.com> wrote:
> Do we expect userspace/QEMU to fence the bad scenarios as tries to do
> today, or is this supposed to change to hardware should sort out
> requests whenever possible.
Does my other mail answer that?
> The problem I see with the let the hardware sort it out is that, for that
> to work, we need to juggle multiple translations simultaneously (or am I
> wrong?). Doing that does not appear particularly simple to me.
None in the first stage, at most two in the second stage, I guess.
> Furthermore we would go through all that hassle knowingly that the sole
> reason is working around bugs. We still expect our Linux guests
> serializing it's ssch() stuff as it does today. Thus I would except this
> code not getting the love nor the coverage that would guard against bugs
> in that code.
So, we should have test code for that? (Any IBM-internal channel I/O
exercisers that may help?)
We should not rely on the guest being sane, although Linux probably is
in that respect.
next prev parent reply other threads:[~2019-01-28 17:14 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-21 11:03 [Qemu-devel] [PATCH v2 0/5] vfio-ccw: support hsch/csch (kernel part) Cornelia Huck
2019-01-21 11:03 ` [Qemu-devel] [PATCH v2 1/5] vfio-ccw: make it safe to access channel programs Cornelia Huck
2019-01-22 14:56 ` Halil Pasic
2019-01-22 15:19 ` Cornelia Huck
2019-01-21 11:03 ` [Qemu-devel] [PATCH v2 2/5] vfio-ccw: concurrent I/O handling Cornelia Huck
2019-01-21 20:20 ` Halil Pasic
2019-01-22 10:29 ` Cornelia Huck
2019-01-22 11:17 ` Halil Pasic
2019-01-22 11:53 ` Cornelia Huck
2019-01-22 12:46 ` Halil Pasic
2019-01-22 17:26 ` Cornelia Huck
2019-01-22 19:03 ` Halil Pasic
2019-01-23 10:34 ` Cornelia Huck
2019-01-23 13:06 ` Halil Pasic
2019-01-23 13:34 ` Cornelia Huck
2019-01-24 19:16 ` Eric Farman
2019-01-25 10:13 ` Cornelia Huck
2019-01-22 18:33 ` Halil Pasic
2019-01-23 10:21 ` Cornelia Huck
2019-01-23 13:30 ` Halil Pasic
2019-01-24 10:05 ` Cornelia Huck
2019-01-24 10:08 ` Pierre Morel
2019-01-24 10:19 ` Cornelia Huck
2019-01-24 11:18 ` Pierre Morel
2019-01-24 11:45 ` Halil Pasic
2019-01-24 19:14 ` Eric Farman
2019-01-25 2:25 ` Eric Farman
2019-01-25 2:37 ` Eric Farman
2019-01-25 10:24 ` Cornelia Huck
2019-01-25 12:58 ` Cornelia Huck
2019-01-25 14:01 ` Halil Pasic
2019-01-25 14:21 ` Cornelia Huck
2019-01-25 16:04 ` Halil Pasic
2019-01-28 17:13 ` Cornelia Huck [this message]
2019-01-28 19:30 ` Halil Pasic
2019-01-29 9:58 ` Cornelia Huck
2019-01-29 19:39 ` Halil Pasic
2019-01-30 13:29 ` Cornelia Huck
2019-01-30 14:32 ` Farhan Ali
2019-01-28 17:09 ` Cornelia Huck
2019-01-28 19:15 ` Halil Pasic
2019-01-28 21:48 ` Eric Farman
2019-01-29 10:20 ` Cornelia Huck
2019-01-29 14:14 ` Eric Farman
2019-01-29 18:53 ` Cornelia Huck
2019-01-29 10:10 ` Cornelia Huck
2019-01-25 15:57 ` Eric Farman
2019-01-28 17:24 ` Cornelia Huck
2019-01-28 21:50 ` Eric Farman
2019-01-25 20:22 ` Eric Farman
2019-01-28 17:31 ` Cornelia Huck
2019-01-25 13:09 ` Halil Pasic
2019-01-25 12:58 ` Halil Pasic
2019-01-25 20:21 ` Eric Farman
2019-01-21 11:03 ` [Qemu-devel] [PATCH v2 3/5] vfio-ccw: add capabilities chain Cornelia Huck
2019-01-23 15:57 ` [Qemu-devel] [qemu-s390x] " Halil Pasic
2019-01-25 16:19 ` [Qemu-devel] " Eric Farman
2019-01-25 21:00 ` Eric Farman
2019-01-28 17:34 ` Cornelia Huck
2019-01-21 11:03 ` [Qemu-devel] [PATCH v2 4/5] s390/cio: export hsch to modules Cornelia Huck
2019-01-22 15:21 ` [Qemu-devel] [qemu-s390x] " Halil Pasic
2019-01-21 11:03 ` [Qemu-devel] [PATCH v2 5/5] vfio-ccw: add handling for async channel instructions Cornelia Huck
2019-01-23 15:51 ` Halil Pasic
2019-01-24 10:06 ` Cornelia Huck
2019-01-24 10:37 ` Halil Pasic
2019-01-25 21:00 ` Eric Farman
2019-01-28 17:40 ` Cornelia Huck
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