From: Joerg Roedel <joro@8bytes.org>
To: Joerg Roedel <joro@8bytes.org>
Cc: fenghua.yu@intel.com, tony.luck@intel.com,
linux-ia64@vger.kernel.org, corbet@lwn.net, x86@kernel.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
iommu@lists.linux-foundation.org, mingo@redhat.com, bp@alien8.de,
Thomas.Lendacky@amd.com, hpa@zytor.com, tglx@linutronix.de
Subject: [PATCH 00/10 v2] Cleanup IOMMU passthrough setting (and disable IOMMU Passthrough when SME is active)
Date: Wed, 14 Aug 2019 15:38:31 +0200 [thread overview]
Message-ID: <20190814133841.7095-1-joro@8bytes.org> (raw)
Hi,
This patch-set started out small to overwrite the default passthrough
setting (through CONFIG_IOMMU_DEFAULT_PASSTHROUGH=y) when SME is active.
But on the way to that Tom reminded me that the current ways to
configure passthrough/no-passthrough modes for IOMMU on x86 is a mess.
So I added a few more patches to clean that up a bit, getting rid of the
iommu_pass_through variable on the way.This information is now kept only
in iommu code, with helpers to change that setting from architecture
code.
And of course this patch-set still disables 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
Changes since v1:
- Cleaned up the kernel command line parameters to
configure passthrough/translated mode, getting rid
of the global iommu_pass_through variable
Joerg Roedel (10):
iommu: Add helpers to set/get default domain type
iommu/amd: Request passthrough mode from IOMMU core
iommu/vt-d: Request passthrough mode from IOMMU core
x86/dma: Get rid of iommu_pass_through
ia64: Get rid of iommu_pass_through
iommu: Remember when default domain type was set on kernel command
line
iommu: Print default domain type on boot
iommu: Set default domain type at runtime
iommu: Disable passthrough mode when SME is active
Documentation: Update Documentation for iommu.passthrough
.../admin-guide/kernel-parameters.txt | 2 +-
arch/ia64/include/asm/iommu.h | 2 -
arch/ia64/kernel/pci-dma.c | 2 -
arch/x86/include/asm/iommu.h | 1 -
arch/x86/kernel/pci-dma.c | 11 +--
drivers/iommu/amd_iommu.c | 6 +-
drivers/iommu/intel-iommu.c | 2 +-
drivers/iommu/iommu.c | 83 +++++++++++++++++--
include/linux/iommu.h | 16 ++++
9 files changed, 101 insertions(+), 24 deletions(-)
--
2.17.1
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next reply other threads:[~2019-08-14 13:39 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-14 13:38 Joerg Roedel [this message]
2019-08-14 13:38 ` [PATCH 01/10] iommu: Add helpers to set/get default domain type Joerg Roedel
2019-08-14 13:38 ` [PATCH 02/10] iommu/amd: Request passthrough mode from IOMMU core Joerg Roedel
2019-08-14 13:38 ` [PATCH 03/10] iommu/vt-d: " Joerg Roedel
2019-08-15 4:46 ` Lu Baolu
2019-08-14 13:38 ` [PATCH 04/10] x86/dma: Get rid of iommu_pass_through Joerg Roedel
2019-08-15 4:53 ` Lu Baolu
2019-08-14 13:38 ` [PATCH 05/10] ia64: " Joerg Roedel
2019-08-14 13:38 ` [PATCH 06/10] iommu: Remember when default domain type was set on kernel command line Joerg Roedel
2019-08-15 5:01 ` Lu Baolu
2019-08-15 7:19 ` Joerg Roedel
2019-08-14 13:38 ` [PATCH 07/10] iommu: Print default domain type on boot Joerg Roedel
2019-08-15 5:04 ` Lu Baolu
2019-08-14 13:38 ` [PATCH 08/10] iommu: Set default domain type at runtime Joerg Roedel
2019-08-15 6:55 ` Lu Baolu
2019-08-14 13:38 ` [PATCH 09/10] iommu: Disable passthrough mode when SME is active Joerg Roedel
2019-08-14 13:38 ` [PATCH 10/10] Documentation: Update Documentation for iommu.passthrough Joerg Roedel
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