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

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

[sathyanarayanan.kuppuswamy]

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.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(+)

-- 
2.20.1

Re: [PATCH v2 0/2] Add page alignment check in Intel IOMMU.

[sathyanarayanan kuppuswamy]

On 2/11/19 1:43 PM, sathyanarayanan.kuppuswamy@linux.intel.com wrote:
> From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.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.
Please ignore this mail. This is my older copy.
>
> 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(+)
>
-- 
Sathyanarayanan Kuppuswamy
Linux kernel developer

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

[sathyanarayanan.kuppuswamy]

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.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.

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