linux-kernel - Re: [PATCH v2 2/2] PCI: hv: Support for Hyper-V vPCI for ARM64

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Date:   Fri, 8 Oct 2021 14:22:59 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Sunil Muthuswamy <sunilmut@...rosoft.com>
Cc:     Marc Zyngier <maz@...nel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Boqun Feng <Boqun.Feng@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Dexuan Cui <decui@...rosoft.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        "Krzysztof Wilczyński" <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Wei Liu <wei.liu@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "\"H. Peter Anvin\"" <hpa@...or.com>,
        Arnd Bergmann <arnd@...db.de>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] PCI: hv: Support for Hyper-V vPCI for ARM64

Subject line should start with a verb telling us what this does.

On Fri, Oct 08, 2021 at 05:21:29PM +0000, Sunil Muthuswamy wrote:
> This patch adds support for Hyper-V vPCI by adding a PCI MSI
> IRQ domain specific to Hyper-V that is based on SPIs. The IRQ
> domain parents itself to the arch GIC IRQ domain for basic
> vector management.

Same "This patch adds ..." comment as for patch 1/2.  You could say
something like "Add support ...".  It would also be good to include
"ARM64" since I think that's the point here.

> +	/* Delivery mode: Fixed */
> +	*delivery_mode = 0;

Why not APIC_DELIVERY_MODE_FIXED as you used for x86?

Bjorn