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Date: Mon, 6 Jun 2016 13:31:15 -0600
From: Alex Williamson <alex.williamson@redhat.com>
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Subject: Re: [Qemu-devel] [RFC PATCH v4 1/3] Mediated device Core driver
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To: Neo Jia <cjia@nvidia.com>
Cc: Dong Jia <bjsdjshi@linux.vnet.ibm.com>, Kirti Wankhede <kwankhede@nvidia.com>, pbonzini@redhat.com, kraxel@redhat.com, qemu-devel@nongnu.org, kvm@vger.kernel.org, kevin.tian@intel.com, shuai.ruan@intel.com, jike.song@intel.com, zhiyuan.lv@intel.com

On Mon, 6 Jun 2016 10:44:25 -0700
Neo Jia <cjia@nvidia.com> wrote:

> On Mon, Jun 06, 2016 at 04:29:11PM +0800, Dong Jia wrote:
> > On Sun, 5 Jun 2016 23:27:42 -0700
> > Neo Jia <cjia@nvidia.com> wrote:
> > 
> > 2. VFIO_DEVICE_CCW_CMD_REQUEST
> > This intends to handle an intercepted channel I/O instruction. It
> > basically need to do the following thing:  
> 
> May I ask how and when QEMU knows that he needs to issue such VFIO ioctl at
> first place?

Yep, this is my question as well.  It sounds a bit like there's an
emulated device in QEMU that's trying to tell the mediated device when
to start an operation when we probably should be passing through
whatever i/o operations indicate that status directly to the mediated
device. Thanks,

Alex