On Fri, 5 May 2017 04:03:39 +0200 Dong Jia Shi <bjsdjshi@xxxxxxxxxxxxxxxxxx> wrote: > The patch series introduce a basic channel I/O passthrough > infrastructure based on vfio. > - Focus on supporting dasd-eckd(cu_type/dev_type = 0x3990/0x3390) as > the target device. > - Support new qemu parameters in the style of: > -machine s390-ccw-virtio(,s390-squash-mcss=on|off) \ > -device vfio-ccw,sysfsdev=$MDEV_PATH > We want to support real (i.e. not virtual) channel devices even for > guests that do not support MCSS-E (where guests may see devices from > any channel subsystem image at once). As all virtio-ccw devices are in > css 0xfe (and show up in the default css 0 for guests not activating > MCSS-E), we need an option to squash e.g. passed-through channel devices > from their real css (0-3, or 0 for hosts not activating MCSS-E) into > the default css, that is what the new machine option s390-squash-css is > added. Basically looks good, some small nitpicking and the virtual vs. virtio issue I noticed. Let's wait if others have more comments. Hopefully, the 3270 changes will by then be in master and you can rebase on top of them :)
