This patchset implements two msix masking optimizations. It works fine for me but I did not have the time to do performance testing yet so I do not know whether it helps and which workloads. Sending out now as I'll be on vacation for a week. Please review and comment.
Thanks! Michael S. Tsirkin (8): virtio: don't waste irqfds on control vqs msix: add api to access msix message kvm: add stub for update msi route virtio-pci: cache msix messages virtio: backend virtqueue notifier masking virtio-net: set/clear vhost_started in reverse order vhost: set started flag while start is in progress vhost: backend masking support hw/pci/msix.c | 2 +- hw/pci/msix.h | 1 + hw/vhost.c | 112 ++++++++++++++++++++++++++----- hw/vhost.h | 10 +++ hw/vhost_net.c | 27 +++++++- hw/vhost_net.h | 3 + hw/virtio-net.c | 22 +++++- hw/virtio-pci.c | 203 ++++++++++++++++++++++++++++++++++++++++++++++++-------- hw/virtio-pci.h | 2 + hw/virtio.h | 15 ++++- kvm-stub.c | 5 ++ 11 files changed, 350 insertions(+), 52 deletions(-) -- MST
