linux-kernel - Re: [EXT] Re: [RFC PATCH 4/4] PCI: endpoint: function: Add EP function driver to provide virtio net device

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Date:   Wed, 8 Feb 2023 14:46:06 +0900
From:   Shunsuke Mie <mie@...l.co.jp>
To:     Frank Li <frank.li@....com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jason Wang <jasowang@...hat.com>, Jon Mason <jdmason@...zu.us>,
        Ren Zhijie <renzhijie2@...wei.com>,
        Takanari Hayama <taki@...l.co.jp>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>
Subject: Re: [EXT] Re: [RFC PATCH 4/4] PCI: endpoint: function: Add EP
 function driver to provide virtio net device


On 2023/02/08 0:37, Frank Li wrote:
>>> but it may need update host side pci virtio driver.
>> Thanks, is it possible to use  MSI-X as well? The virtio spec
>> indicates to use legacy irq or
>> MSI-X only.
> I supposed yes. It is depend MSI controller type in EP side.
> But not like standard PCI MSI-X, it is platform MSI-X irq.
>
> If use GIC-its, it should support MSI-X.
>
> Thomas Gleixner is working on pre-device msi irq domain.
> https://lore.kernel.org/all/20221121135653.208611233@linutronix.de
>
> I hope Thomas can finish their work soon.
> so I can continue my patch upstream work.
> https://lore.kernel.org/imx/87wn7evql7.ffs@tglx/T/#u

Thank for sharing this those information. I'll see the details to embed.

>> Best,
>> Shunsuke.

Best,

Shunsuke.