linux-kernel - [PATCH 0/2] Avoid to use Xen DMA ops when the device is protected by an IOMMU

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Message-Id: <1392913234-25429-1-git-send-email-julien.grall@linaro.org>
Date:	Thu, 20 Feb 2014 16:20:32 +0000
From:	Julien Grall <julien.grall@...aro.org>
To:	linux-kernel@...r.kernel.org, stefano.stabellini@...citrix.com
Cc:	linux-arm-kernel@...ts.infradead.org, ian.campbell@...rix.com,
	xen-devel@...ts.xenproject.org,
	Julien Grall <julien.grall@...aro.org>
Subject: [PATCH 0/2] Avoid to use Xen DMA ops when the device is protected by an IOMMU

Hello all

This small patch series allows Xen guest to be used when Xen is programming
the IOMMUs.

For this purpose, I have added a new optional property "protected-devices" which
list the devices protected by an IOMMU.

The first patch create a new helper which will contain Xen specific check
to know if we might need to use swiotlb-xen. The second patch is implementing
the goal of this patch series.

Regards,

Julien Grall (2):
  arm/xen: Introduce need_xen_dma_ops and use it in get_dma_ops
  arm/xen: Don't use xen DMA ops when the device is protected by an
    IOMMU

 Documentation/devicetree/bindings/arm/xen.txt |    2 +
 arch/arm/include/asm/dma-mapping.h            |    5 +-
 arch/arm/include/asm/xen/dma-mapping.h        |   22 ++++++++
 arch/arm/include/asm/xen/hypervisor.h         |    2 -
 arch/arm/xen/enlighten.c                      |   75 +++++++++++++++++++++++++
 5 files changed, 101 insertions(+), 5 deletions(-)
 create mode 100644 arch/arm/include/asm/xen/dma-mapping.h

-- 
1.7.10.4

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