* Alex Williamson <alex.william...@redhat.com> [2017-01-17 15:49:28 -0700]:
> On Thu, 12 Jan 2017 08:25:08 +0100 > Dong Jia Shi <bjsdj...@linux.vnet.ibm.com> wrote: > > > From: Xiao Feng Ren <renxi...@linux.vnet.ibm.com> > > > > We use the IOMMU_TYPE1 of VFIO to realize the subchannels > > passthrough, implement a vfio based subchannels passthrough > > driver called "vfio-ccw". > > > > Support qemu parameters in the style of: > > "-device vfio-ccw,id=xx,hostid=xx(,guestid=xx),mdevid=xx" > > Why not adopt the same syntax as vfio-pci with mdev devices, > sysfsdev=%s where %s is a path to the mdev device in sysfs, which can > be /sys/bus/mdev/devices/$UUID or as you create from the hostid > below /sys/bus/css/devices/%x.%x.%04x/$UUID. Ok. This is a good point. I will change the cmdline interface to: -device vfio-ccw,id=xx,sysfsdev=xx(,devno=xx) Since "hostid" is removed, I will also rename "guestid" to "devno" to make it looking consistent with the virtio-ccw devices. > It seems if we know where > to find the mdev device then we can determine the parent information on > our own through sysfs. > This is true. > > Signed-off-by: Xiao Feng Ren <renxi...@linux.vnet.ibm.com> [...] -- Dong Jia
