This patch series makes use of the s390 ioeventfd implementation to speed up virtio-ccw a bit. We hook up virtio notifications via diagnose 500 as ioeventfds, specifying a subchannel id and virtqueue index combination. ioeventfds are used by default for all virtio devices; there's an ioeventfd property that can be used to turn ioeventfd usage off for a device (similar to virtio-pci). A simple dd on a virtio-blk device dd if=/dev/vda of=/dev/null iflag=direct bs=4k count=10000 is now twice as fast :) (Patches are against master.) Cornelia Huck (2): linux-headers: Update with ioeventfd changes. virtio-ccw: Wire up ioeventfd. hw/s390x/css.c | 2 +- hw/s390x/css.h | 1 + hw/s390x/virtio-ccw.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++ hw/s390x/virtio-ccw.h | 7 +++ linux-headers/linux/kvm.h | 4 +- target-s390x/cpu.h | 16 +++++++ target-s390x/kvm.c | 27 +++++++++++ 7 files changed, 169 insertions(+), 2 deletions(-) -- 1.7.12.4 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
