linux-kernel - Re: [patch 0/3] x86/PCI/MSI: Make sure that irq reservation mode works everywhere

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Message-ID: <20171020230127.GW6332@bhelgaas-glaptop.roam.corp.google.com>
Date:   Fri, 20 Oct 2017 18:01:27 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Dexuan Cui <decui@...rosoft.com>, x86@...nel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Marc Zyngier <marc.zyngier@....com>,
        KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        linux-pci@...r.kernel.org, devel@...uxdriverproject.org,
        Josh Poulson <jopoulso@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Simon Xiao <sixiao@...rosoft.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Mihai Costache <v-micos@...rosoft.com>,
        Jork Loeser <Jork.Loeser@...rosoft.com>
Subject: Re: [patch 0/3] x86/PCI/MSI: Make sure that irq reservation mode
 works everywhere

On Tue, Oct 17, 2017 at 09:54:56AM +0200, Thomas Gleixner wrote:
> Dexuan reported that the recent rework of the vector allocation mode in x86
> broke HyperV PCI passtrough because the rework missed to add the
> MSI_FLAG_MUST_REACTIVATE flag to the HyperV/PCI interrupt domain info.
> 
> The simple solution would be to set the flag in the HyperV/PCI driver but
> it's better to make this generic and let the PCI/MSI core code set the flag
> when reservation mode is enabled. That ensures that future users of this
> wont trip over the same problem.
> 
> Thanks,
> 
> 	tglx
> 
> ---
>  arch/x86/Kconfig           |    2 +-
>  arch/x86/kernel/apic/msi.c |    5 ++---
>  drivers/pci/msi.c          |    2 ++
>  kernel/irq/Kconfig         |    3 +++
>  4 files changed, 8 insertions(+), 4 deletions(-)

This mentions 4900be83602b ("x86/vector/msi: Switch to global reservation
mode"), which I don't have, so I assume it's an x86 thing.  So I guess
you'll probably merge this via the same tree?

Here's my ack for the PCI part:

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>