From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx> 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
