linux-kernel - [PATCH v3 0/2] Add page alignment check in Intel IOMMU.

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Message-Id: <cover.1550602392.git.sathyanarayanan.kuppuswamy@linux.intel.com>
Date:   Tue, 19 Feb 2019 11:06:08 -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 v3 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 uses 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.

Changes since v1:
 * Fixed issue with PCI_ATS_CAP_PAGE_ALIGNED macro.
 * Fixed comments.

Changes since v2:
 * Fixed Bjorn Helgaas comments.

Kuppuswamy Sathyanarayanan (2):
  PCI/ATS: Add pci_ats_page_aligned() interface
  iommu/vt-d: Enable ATS only if the device uses page aligned address.

 drivers/iommu/intel-iommu.c   |  1 +
 drivers/pci/ats.c             | 27 +++++++++++++++++++++++++++
 include/linux/pci.h           |  2 ++
 include/uapi/linux/pci_regs.h |  1 +
 4 files changed, 31 insertions(+)

-- 
2.20.1