linux-kernel - Re: iommu/vt-d: Cure VF irqdomain hickup

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Date:   Mon, 16 Nov 2020 19:22:21 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Thomas Gleixner <tglx@...utronix.de>
CC:     Ziyad Atiyyeh <ziyadat@...dia.com>,
        Itay Aveksis <itayav@...dia.com>,
        Moshe Shemesh <moshe@...dia.com>,
        LKML <linux-kernel@...r.kernel.org>, <x86@...nel.org>,
        Joerg Roedel <joro@...tes.org>,
        <iommu@...ts.linux-foundation.org>, <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Marc Zyngier <maz@...nel.org>,
        David Woodhouse <dwmw2@...radead.org>
Subject: Re: iommu/vt-d: Cure VF irqdomain hickup

On Thu, Nov 12, 2020 at 08:15:02PM +0100, Thomas Gleixner wrote:
> The recent changes to store the MSI irqdomain pointer in struct device
> missed that Intel DMAR does not register virtual function devices.  Due to
> that a VF device gets the plain PCI-MSI domain assigned and then issues
> compat MSI messages which get caught by the interrupt remapping unit.
> 
> Cure that by inheriting the irq domain from the physical function
> device.
> 
> That's a temporary workaround. The correct fix is to inherit the irq domain
> from the bus, but that's a larger effort which needs quite some other
> changes to the way how x86 manages PCI and MSI domains.
> 
> Fixes: 85a8dfc57a0b ("iommm/vt-d: Store irq domain in struct device")
> Reported-by: Jason Gunthorpe <jgg@...dia.com>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
>  drivers/iommu/intel/dmar.c |   19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)

Our QA says it solves the issue:

Tested-by: Itay Aveksis <itayav@...dia.com>

Thanks,
Jason