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Per PCIe r5.0, sec 9.3.7.14, if a PF implements the PASID Capability, the PF PASID configuration is shared by its VFs, and VFs must not implement their own PASID Capability. But commit751035b8dc("PCI/ATS: Cache PASID Capability offset") changed pci_max_pasids() and pci_pasid_features() to use the PASID Capability of the VF device instead of the associated PF device. This leads to IOMMU bind failures when pci_max_pasids() and pci_pasid_features() are called for VFs. In pci_max_pasids() and pci_pasid_features(), always use the PF PASID Capability. Fixes:751035b8dc("PCI/ATS: Cache PASID Capability offset") Link: https://lore.kernel.org/r/fe891f9755cb18349389609e7fed9940fc5b081a.1580325170.git.sathyanarayanan.kuppuswamy@linux.intel.com Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org # v5.5+
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.