Currently, the default msix vectors for virtio-net-pci is 3 which is
obvious not suitable for multiqueue guest, so we depends on the user
or management tools to pass a correct vectors parameter. In fact, we
can simplifying this by calculating the number of vectors on realize.
Consider we have N queues, the number of vectors needed is 2*N + 2
(#queue pairs + plus one config interrupt and control vq). We didn't
check whether or not host support control vq because it was added
unconditionally by qemu to avoid breaking legacy guests such as Minix.
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
Changes since v1:
- Fix typo in the commit log
- Explain the magic number during vectors calculation
---
hw/core/machine.c | 1 +
hw/virtio/virtio-net-pci.c | 10 +++++++++-
2 files changed, 10 insertions(+), 1 deletion(-)