Re: [PATCH RFC 0/8] virtio: add guest MSI-X support

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Am Monday 27 April 2009 14:31:36 schrieb Michael S. Tsirkin:
> 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>

I dont know, if that is feasible for MSI, but the transport(virtio_pci) should
already know the number of virtqueues, which should match the number of
vectors, no?

In fact, the transport has to have a way of getting the number of virtqeues
because find_vq returns ENOENT on invalid index numbers.

Christian
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