linux-kernel - Re: [PATCH v3] iommu/vt-d: Don't apply gfx quirks to untrusted devices

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Message-ID: <CACK8Z6GmUBwRV0=DFLdRDWR7vVTCvX8zAGzP8Xpu+hb+YPD2fA@mail.gmail.com>
Date:   Wed, 3 Jun 2020 06:03:55 -0700
From:   Rajat Jain <rajatja@...gle.com>
To:     Mika Westerberg <mika.westerberg@...el.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        iommu@...ts.linux-foundation.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ashok Raj <ashok.raj@...el.com>,
        "Krishnakumar, Lalithambika" <lalithambika.krishnakumar@...el.com>,
        Rajat Jain <rajatxjain@...il.com>,
        Prashant Malani <pmalani@...gle.com>,
        Benson Leung <bleung@...gle.com>,
        Alex Levin <levinale@...gle.com>,
        Zubin Mithra <zsm@...gle.com>,
        Mattias Nissler <mnissler@...gle.com>,
        Todd Broch <tbroch@...gle.com>
Subject: Re: [PATCH v3] iommu/vt-d: Don't apply gfx quirks to untrusted devices

On Tue, Jun 2, 2020 at 10:30 PM Mika Westerberg
<mika.westerberg@...el.com> wrote:
>
> On Tue, Jun 02, 2020 at 04:26:02PM -0700, Rajat Jain wrote:
> > +static bool risky_device(struct pci_dev *pdev)
> > +{
> > +     if (pdev->untrusted) {
> > +             pci_warn(pdev,
> > +                      "Skipping IOMMU quirk for dev (%04X:%04X) on untrusted"
> > +                      " PCI link. Please check with your BIOS/Platform"
> > +                      " vendor about this\n", pdev->vendor, pdev->device);
>
> You should not break user visible strings like this. It makes grepping
> for them harder (see also CodingStyle). You can write it like this instead:
>
>         pci_info(pdev, "Skipping IOMMU quirk for dev (%04X:%04X) on untrusted PCI link\n",
>                  pdev->vendor, pdev->device);
>         pci_info(pdev, "Please check with your BIOS/Platform vendor about this\n");
>
> Also I guess pci_info() might be better here after all. Your call :)

Done, sent the updated patch.

Thanks,

Rajat

>
> Rest of the patch looks good to me.