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: [PATCH v2 2/5] vfio-ccw: concurrent I/O handling
Date: Fri, 25 Jan 2019 15:21:54 +0100 [thread overview]
Message-ID: <20190125152154.05120461.cohuck@redhat.com> (raw)
In-Reply-To: <20190125150101.3b61f0a1@oc2783563651>
On Fri, 25 Jan 2019 15:01:01 +0100
Halil Pasic <pasic@linux.ibm.com> wrote:
> On Fri, 25 Jan 2019 13:58:35 +0100
> Cornelia Huck <cohuck@redhat.com> wrote:
> > - We currently do not want the user space to submit another channel
> > program while the first one is still in flight. As submitting another
> > one is a valid request, however, we should allow this in the future
> > (once we have the code to handle that in place).
>
> I don't agree. There is at most one channel program processed by a
> subchannel at any time. I would prefer an early error code if channel
> programs are issued on top of each other (our virtual subchannel
> is channel pending or FC start function bit set or similar).
You can submit a new request if the subchannel is pending with primary,
but not with secondary state.
Regardless of that, I think it is much easier to push as much as
possible of sorting out of requests to the hardware.
WARNING: multiple messages have this Message-ID (diff)
From: Cornelia Huck <cohuck@redhat.com>
To: Halil Pasic <pasic@linux.ibm.com>
Cc: Eric Farman <farman@linux.ibm.com>,
Farhan Ali <alifm@linux.ibm.com>,
Pierre Morel <pmorel@linux.ibm.com>,
linux-s390@vger.kernel.org, kvm@vger.kernel.org,
qemu-devel@nongnu.org, qemu-s390x@nongnu.org,
Alex Williamson <alex.williamson@redhat.com>
Subject: Re: [Qemu-devel] [PATCH v2 2/5] vfio-ccw: concurrent I/O handling
Date: Fri, 25 Jan 2019 15:21:54 +0100 [thread overview]
Message-ID: <20190125152154.05120461.cohuck@redhat.com> (raw)
In-Reply-To: <20190125150101.3b61f0a1@oc2783563651>
On Fri, 25 Jan 2019 15:01:01 +0100
Halil Pasic <pasic@linux.ibm.com> wrote:
> On Fri, 25 Jan 2019 13:58:35 +0100
> Cornelia Huck <cohuck@redhat.com> wrote:
> > - We currently do not want the user space to submit another channel
> > program while the first one is still in flight. As submitting another
> > one is a valid request, however, we should allow this in the future
> > (once we have the code to handle that in place).
>
> I don't agree. There is at most one channel program processed by a
> subchannel at any time. I would prefer an early error code if channel
> programs are issued on top of each other (our virtual subchannel
> is channel pending or FC start function bit set or similar).
You can submit a new request if the subchannel is pending with primary,
but not with secondary state.
Regardless of that, I think it is much easier to push as much as
possible of sorting out of requests to the hardware.
next prev parent reply other threads:[~2019-01-25 14:21 UTC|newest]
Thread overview: 134+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-21 11:03 [PATCH v2 0/5] vfio-ccw: support hsch/csch (kernel part) Cornelia Huck
2019-01-21 11:03 ` [Qemu-devel] " Cornelia Huck
2019-01-21 11:03 ` [PATCH v2 1/5] vfio-ccw: make it safe to access channel programs Cornelia Huck
2019-01-21 11:03 ` [Qemu-devel] " Cornelia Huck
2019-01-22 14:56 ` Halil Pasic
2019-01-22 14:56 ` [Qemu-devel] " Halil Pasic
2019-01-22 15:19 ` Cornelia Huck
2019-01-22 15:19 ` [Qemu-devel] " Cornelia Huck
2019-01-21 11:03 ` [PATCH v2 2/5] vfio-ccw: concurrent I/O handling Cornelia Huck
2019-01-21 11:03 ` [Qemu-devel] " Cornelia Huck
2019-01-21 20:20 ` Halil Pasic
2019-01-21 20:20 ` [Qemu-devel] " Halil Pasic
2019-01-22 10:29 ` Cornelia Huck
2019-01-22 10:29 ` [Qemu-devel] " Cornelia Huck
2019-01-22 11:17 ` Halil Pasic
2019-01-22 11:17 ` [Qemu-devel] " Halil Pasic
2019-01-22 11:53 ` Cornelia Huck
2019-01-22 11:53 ` [Qemu-devel] " Cornelia Huck
2019-01-22 12:46 ` Halil Pasic
2019-01-22 12:46 ` [Qemu-devel] " Halil Pasic
2019-01-22 17:26 ` Cornelia Huck
2019-01-22 17:26 ` [Qemu-devel] " Cornelia Huck
2019-01-22 19:03 ` Halil Pasic
2019-01-22 19:03 ` [Qemu-devel] " Halil Pasic
2019-01-23 10:34 ` Cornelia Huck
2019-01-23 10:34 ` [Qemu-devel] " Cornelia Huck
2019-01-23 13:06 ` Halil Pasic
2019-01-23 13:06 ` [Qemu-devel] " Halil Pasic
2019-01-23 13:34 ` Cornelia Huck
2019-01-23 13:34 ` [Qemu-devel] " Cornelia Huck
2019-01-24 19:16 ` Eric Farman
2019-01-24 19:16 ` [Qemu-devel] " Eric Farman
2019-01-25 10:13 ` Cornelia Huck
2019-01-25 10:13 ` [Qemu-devel] " Cornelia Huck
2019-01-22 18:33 ` Halil Pasic
2019-01-22 18:33 ` [Qemu-devel] " Halil Pasic
2019-01-23 10:21 ` Cornelia Huck
2019-01-23 10:21 ` [Qemu-devel] " Cornelia Huck
2019-01-23 13:30 ` Halil Pasic
2019-01-23 13:30 ` [Qemu-devel] " Halil Pasic
2019-01-24 10:05 ` Cornelia Huck
2019-01-24 10:05 ` [Qemu-devel] " Cornelia Huck
2019-01-24 10:08 ` Pierre Morel
2019-01-24 10:08 ` [Qemu-devel] " Pierre Morel
2019-01-24 10:19 ` Cornelia Huck
2019-01-24 10:19 ` [Qemu-devel] " Cornelia Huck
2019-01-24 11:18 ` Pierre Morel
2019-01-24 11:18 ` [Qemu-devel] " Pierre Morel
2019-01-24 11:45 ` Halil Pasic
2019-01-24 11:45 ` [Qemu-devel] " Halil Pasic
2019-01-24 19:14 ` Eric Farman
2019-01-24 19:14 ` [Qemu-devel] " Eric Farman
2019-01-25 2:25 ` Eric Farman
2019-01-25 2:25 ` [Qemu-devel] " Eric Farman
2019-01-25 2:37 ` Eric Farman
2019-01-25 2:37 ` [Qemu-devel] " Eric Farman
2019-01-25 10:24 ` Cornelia Huck
2019-01-25 10:24 ` [Qemu-devel] " Cornelia Huck
2019-01-25 12:58 ` Cornelia Huck
2019-01-25 12:58 ` [Qemu-devel] " Cornelia Huck
2019-01-25 14:01 ` Halil Pasic
2019-01-25 14:01 ` [Qemu-devel] " Halil Pasic
2019-01-25 14:21 ` Cornelia Huck [this message]
2019-01-25 14:21 ` Cornelia Huck
2019-01-25 16:04 ` Halil Pasic
2019-01-25 16:04 ` [Qemu-devel] " Halil Pasic
2019-01-28 17:13 ` Cornelia Huck
2019-01-28 17:13 ` [Qemu-devel] " Cornelia Huck
2019-01-28 19:30 ` Halil Pasic
2019-01-28 19:30 ` [Qemu-devel] " Halil Pasic
2019-01-29 9:58 ` Cornelia Huck
2019-01-29 9:58 ` [Qemu-devel] " Cornelia Huck
2019-01-29 19:39 ` Halil Pasic
2019-01-29 19:39 ` [Qemu-devel] " Halil Pasic
2019-01-30 13:29 ` Cornelia Huck
2019-01-30 13:29 ` [Qemu-devel] " Cornelia Huck
2019-01-30 14:32 ` Farhan Ali
2019-01-30 14:32 ` [Qemu-devel] " Farhan Ali
2019-01-28 17:09 ` Cornelia Huck
2019-01-28 17:09 ` [Qemu-devel] " Cornelia Huck
2019-01-28 19:15 ` Halil Pasic
2019-01-28 19:15 ` [Qemu-devel] " Halil Pasic
2019-01-28 21:48 ` Eric Farman
2019-01-28 21:48 ` [Qemu-devel] " Eric Farman
2019-01-29 10:20 ` Cornelia Huck
2019-01-29 10:20 ` [Qemu-devel] " Cornelia Huck
2019-01-29 14:14 ` Eric Farman
2019-01-29 14:14 ` [Qemu-devel] " Eric Farman
2019-01-29 18:53 ` Cornelia Huck
2019-01-29 18:53 ` [Qemu-devel] " Cornelia Huck
2019-01-29 10:10 ` Cornelia Huck
2019-01-29 10:10 ` [Qemu-devel] " Cornelia Huck
2019-01-25 15:57 ` Eric Farman
2019-01-25 15:57 ` [Qemu-devel] " Eric Farman
2019-01-28 17:24 ` Cornelia Huck
2019-01-28 17:24 ` [Qemu-devel] " Cornelia Huck
2019-01-28 21:50 ` Eric Farman
2019-01-28 21:50 ` [Qemu-devel] " Eric Farman
2019-01-25 20:22 ` Eric Farman
2019-01-25 20:22 ` [Qemu-devel] " Eric Farman
2019-01-28 17:31 ` Cornelia Huck
2019-01-28 17:31 ` [Qemu-devel] " Cornelia Huck
2019-01-25 13:09 ` Halil Pasic
2019-01-25 13:09 ` [Qemu-devel] " Halil Pasic
2019-01-25 12:58 ` Halil Pasic
2019-01-25 12:58 ` [Qemu-devel] " Halil Pasic
2019-01-25 20:21 ` Eric Farman
2019-01-25 20:21 ` [Qemu-devel] " Eric Farman
2019-01-21 11:03 ` [PATCH v2 3/5] vfio-ccw: add capabilities chain Cornelia Huck
2019-01-21 11:03 ` [Qemu-devel] " Cornelia Huck
2019-01-23 15:57 ` [qemu-s390x] " Halil Pasic
2019-01-23 15:57 ` [Qemu-devel] " Halil Pasic
2019-01-25 16:19 ` Eric Farman
2019-01-25 16:19 ` [Qemu-devel] " Eric Farman
2019-01-25 21:00 ` Eric Farman
2019-01-25 21:00 ` [Qemu-devel] " Eric Farman
2019-01-28 17:34 ` Cornelia Huck
2019-01-28 17:34 ` [Qemu-devel] " Cornelia Huck
2019-01-21 11:03 ` [PATCH v2 4/5] s390/cio: export hsch to modules Cornelia Huck
2019-01-21 11:03 ` [Qemu-devel] " Cornelia Huck
2019-01-22 15:21 ` [qemu-s390x] " Halil Pasic
2019-01-22 15:21 ` [Qemu-devel] " Halil Pasic
2019-01-21 11:03 ` [PATCH v2 5/5] vfio-ccw: add handling for async channel instructions Cornelia Huck
2019-01-21 11:03 ` [Qemu-devel] " Cornelia Huck
2019-01-23 15:51 ` Halil Pasic
2019-01-23 15:51 ` [Qemu-devel] " Halil Pasic
2019-01-24 10:06 ` Cornelia Huck
2019-01-24 10:06 ` [Qemu-devel] " Cornelia Huck
2019-01-24 10:37 ` Halil Pasic
2019-01-24 10:37 ` [Qemu-devel] " Halil Pasic
2019-01-25 21:00 ` Eric Farman
2019-01-25 21:00 ` [Qemu-devel] " Eric Farman
2019-01-28 17:40 ` Cornelia Huck
2019-01-28 17:40 ` [Qemu-devel] " Cornelia Huck
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190125152154.05120461.cohuck@redhat.com \
--to=cohuck@redhat.com \
--cc=alex.williamson@redhat.com \
--cc=alifm@linux.ibm.com \
--cc=farman@linux.ibm.com \
--cc=kvm@vger.kernel.org \
--cc=linux-s390@vger.kernel.org \
--cc=pasic@linux.ibm.com \
--cc=pmorel@linux.ibm.com \
--cc=qemu-devel@nongnu.org \
--cc=qemu-s390x@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.