linux-kernel - kdump boot failing with IVRS checksum failure

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Message-ID: <87o8lzvtzp.fsf@redhat.com>
Date:   Mon, 21 Sep 2020 11:56:42 -0700
From:   Jerry Snitselaar <jsnitsel@...hat.com>
To:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Joerg Roedel <joro@...tes.org>,
        Adrian Huang <adrianhuang0701@...il.com>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: kdump boot failing with IVRS checksum failure

Hello Joerg,

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.

Regards,
Jerry