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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Message-ID: <HE1PR0401MB2331D1335BFACBD23B7676EF88DB9@HE1PR0401MB2331.eurprd04.prod.outlook.com>
Date:   Tue, 7 Feb 2023 15:37:16 +0000
From:   Frank Li <frank.li@....com>
To:     Shunsuke Mie <mie@...l.co.jp>
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

> > 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

> >
> Best,
> Shunsuke.