linux-kernel - Re: kdump boot failing with IVRS checksum failure

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Message-ID: <20200924092348.GI27174@8bytes.org>
Date:   Thu, 24 Sep 2020 11:23:48 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Jerry Snitselaar <jsnitsel@...hat.com>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Adrian Huang <adrianhuang0701@...il.com>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: Re: kdump boot failing with IVRS checksum failure

Hi Jerry,

On Mon, Sep 21, 2020 at 11:56:42AM -0700, Jerry Snitselaar wrote:
> We are seeing a kdump kernel boot failure in test on an HP DL325 Gen10
> and it was tracked down to 387caf0b759a ("iommu/amd: Treat per-device
> exclusion ranges as r/w unity-mapped regions"). Reproduced on 5.9-rc5
> and goes away with revert of the commit. There is a follow on commit
> that depends on this that was reverted as well 2ca6b6dc8512 ("iommu/amd:
> Remove unused variable"). I'm working on getting system access and want
> to see what the IVRS table looks like, but thought I'd give you heads
> up.

Thanks for looking into this, we really need to find the root-cause to
avoid the revert.

Thanks,

	Joerg