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Re: [virtio-dev] Re: [PATCH v2 4/5] virtio-mmio: add MSI interrupt featu

From: Jason Wang
Subject: Re: [virtio-dev] Re: [PATCH v2 4/5] virtio-mmio: add MSI interrupt feature support
Date: Thu, 13 Feb 2020 11:40:37 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0

On 2020/2/12 下午5:16, Michael S. Tsirkin wrote:
Thanks for the advice.:)

Actually when looking into pci, the queue_msix_vector/msix_config is the
msi vector index, which is the same as the mmio register MsiVecSel

So we don't introduce two extra registers for mapping even in sharing

What do you think?

I'm not sure I get the point, but I still prefer the separate vector_sel
from queue_msix_vector.

Btw, Michael propose per vq registers which could also work.


Right and I'd even ask a question: do we need shared MSI at all?

I guess it is still needed at least for the current virtio code. Technically we may have thousands queues.


Is it somehow better than legacy interrupt? And why?
Performance numbers please.

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