Alexander Merritt f8f9a2d55e HV: refactor device_to_dmaru ... On server platforms, DMAR DRHD device scope entries may contain PCI bridges. Bridges in the DRHD device scope indicate this IOMMU translates for all devices on the hierarchy below that bridge. ACRN is unaware of bridge types in the device scope, and adds these directly to its internal representation of a DRHD. When looking up a BDF within these DRHD entries, device_to_dmaru assumes all entries are Endpoints, comparing BDF to BDF. Thus device to DMAR unit fails, because it treats a bridge as an Endpoint type. This change leverages prior patches by converting a BDF to the associated device DRHD index, and uses that index to obtain the correct DRHD state. Handling a bridge in other ways may require maintaining a bus list for each, or replacing each bridge in the dev scope with a set of all device BDFs underneath it. Server platforms can have hundreds of PCI devices, thus making the device scope artificially large is unwieldy. v3->v2 Fixed MISRA-c deviations v2->v1 Added code comments for possible reasons why pci_lookup_drhd_for_pbdf returns -1U Tracked-On: #4134 Signed-off-by: Alexander Merritt <alex.merritt@intel.com>		2019-12-10 09:52:17 +08:00
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x86	HV: refactor device_to_dmaru	2019-12-10 09:52:17 +08:00