linux-kernel - Re: [PATCH v2] iommu/dma: Add config for PCI SAC address trick

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Message-ID: <YrRPfhXvdPo0Y6Cx@8bytes.org>
Date:   Thu, 23 Jun 2022 13:33:18 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Robin Murphy <robin.murphy@....com>
Cc:     will@...nel.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, hch@....de, john.garry@...wei.com
Subject: Re: [PATCH v2] iommu/dma: Add config for PCI SAC address trick

On Wed, Jun 22, 2022 at 02:12:39PM +0100, Robin Murphy wrote:
> Thanks for your bravery!

It already starts, with that patch I am getting:

	xhci_hcd 0000:02:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x000f address=0xff00ffffffefe000 flags=0x0000]

In my kernel log. The device is an AMD XHCI controller and seems to
funciton normally after boot. The message disappears with
iommu.forcedac=0.

Need to look more into that...