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Re: [PATCH v2 00/19] util/vfio-helpers: Allow using multiple MSIX IRQs

From: Stefan Hajnoczi
Subject: Re: [PATCH v2 00/19] util/vfio-helpers: Allow using multiple MSIX IRQs
Date: Tue, 27 Oct 2020 09:55:13 +0000

On Mon, Oct 26, 2020 at 11:54:45AM +0100, Philippe Mathieu-Daudé wrote:
> This series allow using multiple MSIX IRQs
> We currently share a single IRQ between 2 NVMe queues
> (ADMIN and I/O). This series still uses 1 shared IRQ
> but prepare for using multiple ones.
> Since v1:
> - Addressed Stefan comment in patch #14
>   "Pass minimum page size to qemu_vfio_open_pci"
>   (check the page size is in range with device)
> - To reduce (and simplify) changes in patch #14, added
>   new patch #2 "Introduce device/iommu 'page_size_min' variables"
> - Added "Trace controller capabilities" useful to test the
>   previous changes
> - "Set request_alignment at initialization" reported by Stefan
>   (and tested by Eric off-list).

The MSI-X patches look good.

I'm confused about the page size patches since they don't solve the 4KB
device page size on 64KB IOMMU page size issue that you and Eric were
working on. I would prefer to hold off on page size changes until that
work is complete.


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