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

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Date:   Wed, 3 Jun 2020 08:30:08 +0300
From:   Mika Westerberg <mika.westerberg@...el.com>
To:     Rajat Jain <rajatja@...gle.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@...r.kernel.org,
        Ashok Raj <ashok.raj@...el.com>,
        lalithambika.krishnakumar@...el.com, rajatxjain@...il.com,
        pmalani@...gle.com, bleung@...gle.com, levinale@...gle.com,
        zsm@...gle.com, mnissler@...gle.com, tbroch@...gle.com
Subject: Re: [PATCH v3] iommu/vt-d: Don't apply gfx quirks to untrusted
 devices

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 :)

Rest of the patch looks good to me.