Re: [PATCH RFC 00/15] Add VFIO mediated device support and IMS support for the idxd driver.

[Jason Wang]

On 2020/4/22 äå7:54, Jason Gunthorpe wrote:
> > The mdev utilizes Interrupt Message Store or IMS[3] instead of MSIX for
> > interrupts for the guest. This preserves MSIX for host usages and also allows a
> > significantly larger number of interrupt vectors for guest usage.
> I never did get a reply to my earlier remarks on the IMS patches.
>
> The concept of a device specific addr/data table format for MSI is not
> Intel specific. This should be general code. We have a device that can
> use this kind of kernel capability today.
>
> Jason

+1.

Another example is to extend virtio MMIO to support MSI[1].

Thanks

[1] https://lkml.org/lkml/2020/2/10/127