DynamicTablesPkg/ArmGicCParser: Parse VGIC interrupt for all CPUs

There are two issues in the GIC FDT parsing code:
- the GICC Flags 'Enabled' bit is overwritten when parsing the VGIC
  Maintenance Interrupt, whose trigger type occupies another bit in the
  same field;
- only the first CPU's Flags field is updated.

This breaks both SMP boot and KVM support on Linux, given that the boot
CPU is disabled in the MADT, and the VGIC maintenance interrupt is set
to 0x0 on all others.

Fix this, by OR'ing the trigger type into the field, and by iterating
over all discovered CPUs.

Signed-off-by: Ard Biesheuvel <[email protected]>

DynamicTablesPkg/Library/FdtHwInfoParserLib/Arm/Gic/ArmGicCParser.c

@@ -167,7 +167,8 @@ CpusNodeParser (
   IN  CONST VOID               *Fdt,
   IN        INT32              CpusNode,
   IN        UINT32             GicVersion,
-  OUT       CM_OBJ_DESCRIPTOR  **NewGicCmObjDesc
+  OUT       CM_OBJ_DESCRIPTOR  **NewGicCmObjDesc,
+  OUT       UINTN              *CpuCount
   )
 {
   EFI_STATUS  Status;
@@ -202,6 +203,8 @@ CpusNodeParser (
     return EFI_NOT_FOUND;
   }
 
+  *CpuCount = CpuNodeCount;
+
   // Allocate memory for CpuNodeCount CM_ARM_GICC_INFO structures.
   GicCInfoBufferSize = CpuNodeCount * sizeof (CM_ARM_GICC_INFO);
   GicCInfoBuffer     = AllocateZeroPool (GicCInfoBufferSize);
@@ -280,6 +283,7 @@ EFIAPI
 GicCIntcNodeParser (
   IN      CONST VOID               *Fdt,
   IN            INT32              GicIntcNode,
+  IN            UINTN              CpuCount,
   IN  OUT       CM_OBJ_DESCRIPTOR  *GicCCmObjDesc
   )
 {
@@ -289,6 +293,8 @@ GicCIntcNodeParser (
 
   CONST UINT8  *Data;
   INT32        DataSize;
+  UINT32       MaintenanceInterrupt;
+  UINT32       Flags;
 
   if (GicCCmObjDesc == NULL) {
     ASSERT (0);
@@ -308,14 +314,17 @@ GicCIntcNodeParser (
   // but it is assumed that only one Gic is available.
   Data = fdt_getprop (Fdt, GicIntcNode, "interrupts", &DataSize);
   if ((Data != NULL) && (DataSize == (IntCells * sizeof (UINT32)))) {
-    GicCInfo                           = (CM_ARM_GICC_INFO *)GicCCmObjDesc->Data;
-    GicCInfo->VGICMaintenanceInterrupt =
-      FdtGetInterruptId ((CONST UINT32 *)Data);
-    GicCInfo->Flags = DT_IRQ_IS_EDGE_TRIGGERED (
-                        fdt32_to_cpu (((UINT32 *)Data)[IRQ_FLAGS_OFFSET])
-                        ) ?
-                      EFI_ACPI_6_3_VGIC_MAINTENANCE_INTERRUPT_MODE_FLAGS :
-                      0;
+    MaintenanceInterrupt = FdtGetInterruptId ((CONST UINT32 *)Data);
+    Flags                = DT_IRQ_IS_EDGE_TRIGGERED (
+                             fdt32_to_cpu (((UINT32 *)Data)[IRQ_FLAGS_OFFSET])
+                             ) ?
+                           EFI_ACPI_6_3_VGIC_MAINTENANCE_INTERRUPT_MODE_FLAGS :
+                           0;
+    for (GicCInfo = (CM_ARM_GICC_INFO *)GicCCmObjDesc->Data; CpuCount--; GicCInfo++) {
+      GicCInfo->VGICMaintenanceInterrupt = MaintenanceInterrupt;
+      GicCInfo->Flags                   |= Flags;
+    }
+
     return Status;
   } else if (DataSize < 0) {
     // This property is optional and was not found. Just return.
@@ -816,6 +825,7 @@ ArmGicCInfoParser (
   UINT32             GicVersion;
   CM_OBJ_DESCRIPTOR  *NewCmObjDesc;
   VOID               *Fdt;
+  UINTN              CpuCount;
 
   if (FdtParserHandle == NULL) {
     ASSERT (0);
@@ -846,7 +856,7 @@ ArmGicCInfoParser (
 
   // Parse the "cpus" nodes and its children "cpu" nodes,
   // and create a CM_OBJ_DESCRIPTOR.
-  Status = CpusNodeParser (Fdt, FdtBranch, GicVersion, &NewCmObjDesc);
+  Status = CpusNodeParser (Fdt, FdtBranch, GicVersion, &NewCmObjDesc, &CpuCount);
   if (EFI_ERROR (Status)) {
     ASSERT (0);
     return Status;
@@ -878,7 +888,7 @@ ArmGicCInfoParser (
   }
 
   // Parse the Gic information common to Gic v2 and v3.
-  Status = GicCIntcNodeParser (Fdt, IntcNode, NewCmObjDesc);
+  Status = GicCIntcNodeParser (Fdt, IntcNode, CpuCount, NewCmObjDesc);
   if (EFI_ERROR (Status)) {
     ASSERT (0);
     goto exit_handler;