linux-kernel - Re: [PATCH 1/1] iommu/vt-d: Correctly calculate sagaw value of IOMMU

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Message-ID: <8702c6eb-bfd6-49d1-f96e-e9ae08cd87b0@linux.intel.com>
Date:   Tue, 23 Aug 2022 14:25:09 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     iommu@...ts.linux.dev
Cc:     baolu.lu@...ux.intel.com, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Kevin Tian <kevin.tian@...el.com>,
        raghunathan.srinivasan@...el.com, yi.l.liu@...el.com,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/1] iommu/vt-d: Correctly calculate sagaw value of IOMMU

On 2022/8/17 10:35, Lu Baolu wrote:
> The Intel IOMMU driver possibly selects between the first-level and the
> second-level translation tables for DMA address translation. However,
> the levels of page-table walks for the 4KB base page size are calculated
> from the SAGAW field of the capability register, which is only valid for
> the second-level page table. This causes the IOMMU driver to stop working
> if the hardware (or the emulated IOMMU) advertises only first-level
> translation capability and reports the SAGAW field as 0.
> 
> This solves the above problem by considering both the first level and the
> second level when calculating the supported page table levels.
> 
> Fixes: b802d070a52a1 ("iommu/vt-d: Use iova over first level")
> Cc:stable@...r.kernel.org
> Signed-off-by: Lu Baolu<baolu.lu@...ux.intel.com>

This patch has been queued:

https://lore.kernel.org/linux-iommu/20220823061557.1631056-1-baolu.lu@linux.intel.com/

Best regards,
baolu