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From: Joerg Roedel <joro@8bytes.org>
To: Joerg Roedel <joro@8bytes.org>
Cc: Thomas.Lendacky@amd.com, iommu@lists.linux-foundation.org,
	bp@alien8.de, linux-kernel@vger.kernel.org
Subject: [PATCH 0/3] Disable IOMMU Passthrough when SME is active
Date: Fri,  9 Aug 2019 17:22:30 +0200	[thread overview]
Message-ID: <20190809152233.2829-1-joro@8bytes.org> (raw)

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

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             reply	other threads:[~2019-08-09 15:22 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-09 15:22 Joerg Roedel [this message]
2019-08-09 15:22 ` [PATCH 1/3] iommu: Print default domain type on boot Joerg Roedel
2019-08-09 15:22 ` [PATCH 2/3] iommu: Set default domain type at runtime Joerg Roedel
2019-08-09 15:22 ` [PATCH 3/3] iommu: Disable passthrough mode when SME is active Joerg Roedel
2019-08-09 16:50   ` Lendacky, Thomas
2019-08-09 20:32     ` Joerg Roedel

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