diff options
| -rw-r--r-- | OvmfPkg/Library/PlatformInitLib/MemDetect.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/OvmfPkg/Library/PlatformInitLib/MemDetect.c b/OvmfPkg/Library/PlatformInitLib/MemDetect.c index c24105c329..6c30566db9 100644 --- a/OvmfPkg/Library/PlatformInitLib/MemDetect.c +++ b/OvmfPkg/Library/PlatformInitLib/MemDetect.c @@ -217,6 +217,51 @@ PlatformAddHobCB ( }
/**
+ Check whenever the 64bit PCI MMIO window overlaps with a reservation
+ from qemu. If so move down the MMIO window to resolve the conflict.
+
+ This happens on (virtual) AMD machines with 1TB address space,
+ because the AMD IOMMU uses an address window just below 1TB.
+**/
+STATIC
+VOID
+PlatformReservationConflictCB (
+ IN EFI_E820_ENTRY64 *E820Entry,
+ IN OUT EFI_HOB_PLATFORM_INFO *PlatformInfoHob
+ )
+{
+ UINT64 IntersectionBase;
+ UINT64 IntersectionEnd;
+ UINT64 NewBase;
+
+ IntersectionBase = MAX (
+ E820Entry->BaseAddr,
+ PlatformInfoHob->PcdPciMmio64Base
+ );
+ IntersectionEnd = MIN (
+ E820Entry->BaseAddr + E820Entry->Length,
+ PlatformInfoHob->PcdPciMmio64Base +
+ PlatformInfoHob->PcdPciMmio64Size
+ );
+
+ if (IntersectionBase >= IntersectionEnd) {
+ return; // no overlap
+ }
+
+ NewBase = E820Entry->BaseAddr - PlatformInfoHob->PcdPciMmio64Size;
+ NewBase = NewBase & ~(PlatformInfoHob->PcdPciMmio64Size - 1);
+
+ DEBUG ((
+ DEBUG_INFO,
+ "%a: move mmio: 0x%Lx => %Lx\n",
+ __FUNCTION__,
+ PlatformInfoHob->PcdPciMmio64Base,
+ NewBase
+ ));
+ PlatformInfoHob->PcdPciMmio64Base = NewBase;
+}
+
+/**
Iterate over the entries in QEMU's fw_cfg E820 RAM map, call the
passed callback for each entry.
@@ -653,6 +698,7 @@ PlatformDynamicMmioWindow ( DEBUG ((DEBUG_INFO, "%a: MMIO Space 0x%Lx (%Ld GB)\n", __func__, MmioSpace, RShiftU64 (MmioSpace, 30)));
PlatformInfoHob->PcdPciMmio64Size = MmioSpace;
PlatformInfoHob->PcdPciMmio64Base = AddrSpace - MmioSpace;
+ PlatformScanE820 (PlatformReservationConflictCB, PlatformInfoHob);
} else {
DEBUG ((DEBUG_INFO, "%a: using classic mmio window\n", __func__));
}
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