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

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Date:   Fri, 24 Apr 2020 14:31:40 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Jason Gunthorpe <jgg@...lanox.com>,
        Dave Jiang <dave.jiang@...el.com>
Cc:     vkoul@...nel.org, megha.dey@...ux.intel.com, maz@...nel.org,
        bhelgaas@...gle.com, rafael@...nel.org, gregkh@...uxfoundation.org,
        tglx@...utronix.de, hpa@...or.com, alex.williamson@...hat.com,
        jacob.jun.pan@...el.com, ashok.raj@...el.com, yi.l.liu@...el.com,
        baolu.lu@...el.com, kevin.tian@...el.com, sanjay.k.kumar@...el.com,
        tony.luck@...el.com, jing.lin@...el.com, dan.j.williams@...el.com,
        kwankhede@...dia.com, eric.auger@...hat.com, parav@...lanox.com,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        x86@...nel.org, linux-pci@...r.kernel.org, kvm@...r.kernel.org,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Zha Bin <zhabin@...ux.alibaba.com>,
        "Liu, Jing2" <jing2.liu@...ux.intel.com>
Subject: Re: [PATCH RFC 00/15] Add VFIO mediated device support and IMS
 support for the idxd driver.


On 2020/4/22 上午7:54, 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