• Ashok Raj's avatar
    iommu/vt-d: Fix IOMMU lookup for SR-IOV Virtual Functions · 1c387188
    Ashok Raj authored
    The VT-d specification (§8.3.3) says:
        ‘Virtual Functions’ of a ‘Physical Function’ are under the scope
        of the same remapping unit as the ‘Physical Function’.
    
    The BIOS is not required to list all the possible VFs in the scope
    tables, and arguably *shouldn't* make any attempt to do so, since there
    could be a huge number of them.
    
    This has been broken basically for ever — the VF is never going to match
    against a specific unit's scope, so it ends up being assigned to the
    INCLUDE_ALL IOMMU. Which was always actually correct by coincidence, but
    now we're looking at Root-Complex integrated devices with SR-IOV support
    it's going to start being wrong.
    
    Fix it to simply use pci_physfn() before doing the lookup for PCI devices.
    
    Cc: stable@vger.kernel.org
    Signed-off-by: default avatarSainath Grandhi <sainath.grandhi@intel.com>
    Signed-off-by: default avatarAshok Raj <ashok.raj@intel.com>
    Signed-off-by: default avatarDavid Woodhouse <dwmw2@infradead.org>
    1c387188
dmar.c 49.9 KB