This implements vhost: a kernel-level backend for virtio, The main motivation for this work is to reduce virtualization overhead for virtio by removing system calls on data path, without guest changes. For virtio-net, this removes up to 4 system calls per packet: vm exit for kick, reentry for kick, iothread wakeup for packet, interrupt injection for packet.
Some more detailed description attached to the patch itself. The patches are against 2.6.31-rc4. I'd like them to go into linux-next and down the road 2.6.32 if possible. Please comment. Userspace bits using this driver will be posted to k...@vger shortly. Michael S. Tsirkin (2): export cpu_tlbstate to modules vhost_net: a kernel-level virtio server MAINTAINERS | 10 + arch/x86/kvm/Kconfig | 1 + arch/x86/mm/tlb.c | 1 + drivers/Makefile | 1 + drivers/block/virtio_blk.c | 3 + drivers/vhost/Kconfig | 11 + drivers/vhost/Makefile | 2 + drivers/vhost/net.c | 462 ++++++++++++++++++++++++++++++ drivers/vhost/vhost.c | 663 ++++++++++++++++++++++++++++++++++++++++++++ drivers/vhost/vhost.h | 108 +++++++ include/linux/Kbuild | 1 + include/linux/miscdevice.h | 1 + include/linux/vhost.h | 100 +++++++ 13 files changed, 1364 insertions(+), 0 deletions(-) create mode 100644 drivers/vhost/Kconfig create mode 100644 drivers/vhost/Makefile create mode 100644 drivers/vhost/net.c create mode 100644 drivers/vhost/vhost.c create mode 100644 drivers/vhost/vhost.h create mode 100644 include/linux/vhost.h _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/virtualization
