[PATCH-for-10.1 v3 7/9] hw/arm/virt-acpi: Always build IORT table (even with GIC ITS disabled)

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

Citing Gustavo [*]:

  Gating IORT table generation entirely based on the presence
  of ITS looks wrong because IORT table has data beyond GIC ITS,
  like for SMMUv3 etc..

[*] https://lore.kernel.org/qemu-devel/bae6e29a-7290-47d2-8caf-14702ee091f0@linaro.org/

Reported-by: Gustavo Romero <gustavo.romero@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 hw/arm/virt-acpi-build.c | 38 +++++++++++++++++++++-----------------
 1 file changed, 21 insertions(+), 17 deletions(-)

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index 1c389ef5cdb..e7e27951cb9 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -287,6 +287,7 @@ build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
     uint32_t id = 0;
     GArray *smmu_idmaps = g_array_new(false, true, sizeof(AcpiIortIdMapping));
     GArray *its_idmaps = g_array_new(false, true, sizeof(AcpiIortIdMapping));
+    bool has_its = its_enabled(vms);
 
     AcpiTable table = { .sig = "IORT", .rev = 3, .oem_id = vms->oem_id,
                         .oem_table_id = vms->oem_table_id };
@@ -325,9 +326,12 @@ build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
 
         nb_nodes = 3; /* RC, ITS, SMMUv3 */
         rc_mapping_count = smmu_idmaps->len + its_idmaps->len;
-    } else {
+    } else if (has_its) {
         nb_nodes = 2; /* RC, ITS */
         rc_mapping_count = 1;
+    } else {
+        nb_nodes = 1; /* RC */
+        rc_mapping_count = 1;
     }
     /* Number of IORT Nodes */
     build_append_int_noprefix(table_data, nb_nodes, 4);
@@ -336,17 +340,19 @@ build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
     build_append_int_noprefix(table_data, IORT_NODE_OFFSET, 4);
     build_append_int_noprefix(table_data, 0, 4); /* Reserved */
 
-    /* Table 12 ITS Group Format */
-    build_append_int_noprefix(table_data, 0 /* ITS Group */, 1); /* Type */
-    node_size =  20 /* fixed header size */ + 4 /* 1 GIC ITS Identifier */;
-    build_append_int_noprefix(table_data, node_size, 2); /* Length */
-    build_append_int_noprefix(table_data, 1, 1); /* Revision */
-    build_append_int_noprefix(table_data, id++, 4); /* Identifier */
-    build_append_int_noprefix(table_data, 0, 4); /* Number of ID mappings */
-    build_append_int_noprefix(table_data, 0, 4); /* Reference to ID Array */
-    build_append_int_noprefix(table_data, 1, 4); /* Number of ITSs */
-    /* GIC ITS Identifier Array */
-    build_append_int_noprefix(table_data, 0 /* MADT translation_id */, 4);
+    if (has_its) {
+        /* Table 12 ITS Group Format */
+        build_append_int_noprefix(table_data, 0 /* ITS Group */, 1); /* Type */ //
+        node_size =  20 /* fixed header size */ + 4 /* 1 GIC ITS Identifier */;
+        build_append_int_noprefix(table_data, node_size, 2); /* Length */
+        build_append_int_noprefix(table_data, 1, 1); /* Revision */
+        build_append_int_noprefix(table_data, id++, 4); /* Identifier */
+        build_append_int_noprefix(table_data, 0, 4); /* Number of ID mappings */
+        build_append_int_noprefix(table_data, 0, 4); /* Reference to ID Array */
+        build_append_int_noprefix(table_data, 1, 4); /* Number of ITSs */
+        /* GIC ITS Identifier Array */
+        build_append_int_noprefix(table_data, 0 /* MADT translation_id */, 4);
+    }
 
     if (vms->iommu == VIRT_IOMMU_SMMUV3) {
         int irq =  vms->irqmap[VIRT_SMMU] + ARM_SPI_BASE;
@@ -429,7 +435,7 @@ build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
             build_iort_id_mapping(table_data, range->input_base,
                                   range->id_count, IORT_NODE_OFFSET);
         }
-    } else {
+    } else if (has_its) {
         /* output IORT node is the ITS group node (the first node) */
         build_iort_id_mapping(table_data, 0, 0x10000, IORT_NODE_OFFSET);
     }
@@ -979,10 +985,8 @@ void virt_acpi_build(VirtMachineState *vms, AcpiBuildTables *tables)
                           vms->oem_table_id);
     }
 
-    if (its_enabled(vms)) {
-        acpi_add_table(table_offsets, tables_blob);
-        build_iort(tables_blob, tables->linker, vms);
-    }
+    acpi_add_table(table_offsets, tables_blob);
+    build_iort(tables_blob, tables->linker, vms);
 
 #ifdef CONFIG_TPM
     if (tpm_get_version(tpm_find()) == TPM_VERSION_2_0) {
-- 
2.47.1