From mboxrd@z Thu Jan  1 00:00:00 1970
From: Halil Pasic <pasic@linux.ibm.com>
Subject: Re: [qemu-s390x] [PATCH 0/3] vfio-ccw: support
 hsch/csch (kernel part)
Date: Sat, 24 Nov 2018 22:07:57 +0100
Message-ID: <20181124220757.43560d50@oc2783563651>
References: <20181122165432.4437-1-cohuck@redhat.com>
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Cc: linux-s390@vger.kernel.org, Eric Farman <farman@linux.ibm.com>,
	Pierre Morel <pmorel@linux.ibm.com>, kvm@vger.kernel.org,
	qemu-s390x@nongnu.org, Farhan Ali <alifm@linux.ibm.com>,
	qemu-devel@nongnu.org, Alex Williamson <alex.williamson@redhat.com>
To: Cornelia Huck <cohuck@redhat.com>
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On Thu, 22 Nov 2018 17:54:29 +0100
Cornelia Huck <cohuck@redhat.com> wrote:

> [This is the Linux kernel part, git tree is available at
> https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/vfio-ccw.git
> vfio-ccw-caps
> 
> The companion QEMU patches are available at
> https://github.com/cohuck/qemu vfio-ccw-caps]
> 
> Currently, vfio-ccw only relays START SUBCHANNEL requests to the real
> device. This tends to work well for the most common 'good path'
> scenarios; however, as we emulate {HALT,CLEAR} SUBCHANNEL in QEMU,
> things like clearing pending requests at the device is currently not
> supported. This may be a problem for e.g. error recovery.
> 
> This patch series introduces capabilities (similar to what vfio-pci
> uses) and exposes a new async region for handling hsch/csch.

I'm on vacation and could not do more than skim over it real quick. FWIW
it looks very promising. I intend to give it an in depth review once I'm
back (i.e. second half of next week).

Regards,
Halil