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hv: Change to a permissive check with broken DMAR table

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From the VT-d spec 8.3:
If a DRHD structure with INCLUDE_PCI_ALL flag Set is reported for a
Segment, it must be enumerated by BIOS after all other DRHD structures
for the same Segment.

However, some broken BIOS violate the rules. To bring up ACRN with them,
change the ASSERT to a permissive check to unblock the BIOS limitation.
Also, scan the DRHD list to find the one who has INCLUDE_PCI_ALL flag.

Tracked-On: #4937
Signed-off-by: Shuo A Liu <shuo.a.liu@intel.com>
This commit is contained in:
Shuo A Liu
2020-06-12 09:40:48 +08:00
committed by wenlingz
parent 03e18ec492
commit 2276f1c43d
2 changed files with 7 additions and 6 deletions
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8
hypervisor/hw/pci.c
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@@ -522,11 +522,11 @@ static void pci_parse_iommu_devscopes(struct pci_bdf_mapping_group *const bdfs_f
*/
}
}
}
if ((plat_dmar_info.drhd_units[plat_dmar_info.drhd_count - 1U].flags & DRHD_FLAG_INCLUDE_PCI_ALL_MASK)
== DRHD_FLAG_INCLUDE_PCI_ALL_MASK) {
*drhd_idx_pci_all = plat_dmar_info.drhd_count - 1U;
if ((plat_dmar_info.drhd_units[drhd_index].flags & DRHD_FLAG_INCLUDE_PCI_ALL_MASK)
== DRHD_FLAG_INCLUDE_PCI_ALL_MASK) {
*drhd_idx_pci_all = drhd_index;
}
}
}