Re: [PATCH] virtio-net: calculating proper msix vectors on init

[Stefan Hajnoczi]

On Mon, Mar 08, 2021 at 01:30:59PM +0800, Jason Wang wrote:
> 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 pais + plus one config interrupt and control vq). We didn't

Maybe this can be squashed in but it's not important:
s/pais/pairs/

> 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>
> ---
>  hw/core/machine.c          | 1 +
>  hw/virtio/virtio-net-pci.c | 8 +++++++-
>  2 files changed, 8 insertions(+), 1 deletion(-)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

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