Add optional MSI-X support: use a vector per virtqueue with fallback to a common vector and finally to regular interrupt. Teach all drivers to use it. I added 2 new virtio operations: request_vqs/free_vqs because MSI needs to know the total number of vectors upfront. Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx> --- Here's a draft set of patches for MSI-X support in the guest. It still needs to be tested properly, and performance impact measured, but I thought I'd share it here in the hope of getting some very early feedback/flames. Michael S. Tsirkin (8): virtio: add request_vqs/free_vqs virtio operations virtio_blk: add request_vqs/free_vqs calls virtio-rng: add request_vqs/free_vqs calls virtio_console: add request_vqs/free_vqs calls virtio_net: add request_vqs/free_vqs calls virtio_balloon: add request_vqs/free_vqs calls virtio_pci: split up vp_interrupt virtio_pci: optional MSI-X support drivers/block/virtio_blk.c | 9 ++- drivers/char/hw_random/virtio-rng.c | 10 ++- drivers/char/virtio_console.c | 8 ++- drivers/net/virtio_net.c | 16 +++- drivers/virtio/virtio_balloon.c | 9 ++- drivers/virtio/virtio_pci.c | 192 ++++++++++++++++++++++++++++++----- include/linux/virtio_config.h | 35 +++++++ 7 files changed, 247 insertions(+), 32 deletions(-) -- 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
