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SubjectRe: [virtio-dev] Re: [PATCH v1 2/2] virtio-mmio: add features for virtio-mmio specification version 3

On 2020/1/3 下午2:14, Liu, Jiang wrote:
>> Ok, I get you now.
>> But still, having fixed number of MSIs is less flexible. E.g:
>> - for x86, processor can only deal with about 250 interrupt vectors.
>> - driver may choose to share MSI vectors [1] (which is not merged but we will for sure need it)
> Thanks for the info:)
> X86 systems roughly have NCPU * 200 vectors available for device interrupts.
> The proposed patch tries to map multiple event sources to an interrupt vector, to avoid running out of x86 CPU vectors.
> Many virtio mmio devices may have several or tens of event sources, and it’s rare to have hundreds of event sources.
> So could we treat the dynamic mapping between event sources and interrupt vectors as an advanced optional feature?

Maybe, but I still prefer to implement it if it is not too complex.
Let's see Michael's opinion on this.


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