linux-kernel - [PATCH v2 0/2] Add page alignment check in Intel IOMMU.

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Message-Id: <cover.1548726944.git.sathyanarayanan.kuppuswamy@linux.intel.com>
Date:   Mon, 11 Feb 2019 13:43:13 -0800
From:   sathyanarayanan.kuppuswamy@...ux.intel.com
To:     bhelgaas@...gle.com, joro@...tes.org, dwmw2@...radead.org
Cc:     linux-pci@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, ashok.raj@...el.com,
        jacob.jun.pan@...el.com, keith.busch@...el.com
Subject: [PATCH v2 0/2] Add page alignment check in Intel IOMMU.

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>

As per Intel vt-d specification, Rev 3.0 (section 7.5.1.1, title "Page Request Descriptor"), Intel IOMMU Page Request Descriptor only provides bits[63:12] of the page address. Hence its required to enforce that the device will only send page request with page-aligned address. So, this patch set adds support to verify whether the device uses page aligned address before enabling the ATS service in Intel IOMMU driver.

Kuppuswamy Sathyanarayanan (2):
  PCI: ATS: Add function to check ATS page alignment status.
  iommu/vt-d: Enable ATS only if the device uses page aligned address.

 drivers/iommu/intel-iommu.c   |  1 +
 drivers/pci/ats.c             | 24 ++++++++++++++++++++++++
 include/linux/pci.h           |  2 ++
 include/uapi/linux/pci_regs.h |  1 +
 4 files changed, 28 insertions(+)

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2.20.1