linux-kernel - [PATCH 0/3] Disable IOMMU Passthrough when SME is active

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Message-Id: <20190809152233.2829-1-joro@8bytes.org>
Date:   Fri,  9 Aug 2019 17:22:30 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Joerg Roedel <joro@...tes.org>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Thomas.Lendacky@....com, Suravee.Suthikulpanit@....com,
        bp@...en8.de
Subject: [PATCH 0/3] Disable IOMMU Passthrough when SME is active

Hi,

here is a small patch-set to disable IOMMU Passthrough mode when SME is
active even when CONFIG_IOMMU_DEFAULT_PASSTHROUGH=y is set.

The reason for that change is that SME with passthrough mode turned out
to be fragile with devices requiring SWIOTLB, mainly because SWIOTLB has
a maximum allocation size of 256kb and a limit overall size of the
bounce buffer.

Therefore having IOMMU in translation mode by default is better when SME
is active on a system.

Please review.

Thanks,

	Joerg

Joerg Roedel (3):
  iommu: Print default domain type on boot
  iommu: Set default domain type at runtime
  iommu: Disable passthrough mode when SME is active

 drivers/iommu/iommu.c | 48 +++++++++++++++++++++++++++++++++++++------
 1 file changed, 42 insertions(+), 6 deletions(-)

-- 
2.17.1