hw/arm/virt: no ITS on older machine types

We should avoid exposing new hardware (through DT and ACPI) on older
machine types. This patch keeps 2.7 and older from changing, despite
the introduction of ITS support for 2.8.

Signed-off-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-id: 1476117341-32690-3-git-send-email-drjones@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index 779d83d83651f5c7cd82304a56c36d1682d0a136..fa0655a7759cf3eeda2691a949b4005f8238f358 100644 (file)
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -554,7 +554,7 @@ build_madt(GArray *table_data, BIOSLinker *linker, VirtGuestInfo *guest_info)
         gicr->base_address = cpu_to_le64(memmap[VIRT_GIC_REDIST].base);
         gicr->range_length = cpu_to_le32(memmap[VIRT_GIC_REDIST].size);
 
-        if (its_class_name()) {
+        if (its_class_name() && !guest_info->no_its) {
             gic_its = acpi_data_push(table_data, sizeof *gic_its);
             gic_its->type = ACPI_APIC_GENERIC_TRANSLATOR;
             gic_its->length = sizeof(*gic_its);

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 795740d9bfd2fca97bd1c9a58ba2a5d85a7c6f3c..895446f17c2b5f5a98172565cd105d78000ddd4d 100644 (file)
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -84,6 +84,7 @@ typedef struct {
     MachineClass parent;
     VirtBoardInfo *daughterboard;
     bool disallow_affinity_adjustment;
+    bool no_its;
 } VirtMachineClass;
 
 typedef struct {
@@ -551,7 +552,8 @@ static void create_v2m(VirtBoardInfo *vbi, qemu_irq *pic)
     fdt_add_v2m_gic_node(vbi);
 }
 
-static void create_gic(VirtBoardInfo *vbi, qemu_irq *pic, int type, bool secure)
+static void create_gic(VirtBoardInfo *vbi, qemu_irq *pic, int type,
+                       bool secure, bool no_its)
 {
     /* We create a standalone GIC */
     DeviceState *gicdev;
@@ -615,9 +617,9 @@ static void create_gic(VirtBoardInfo *vbi, qemu_irq *pic, int type, bool secure)
 
     fdt_add_gic_node(vbi, type);
 
-    if (type == 3) {
+    if (type == 3 && !no_its) {
         create_its(vbi, gicdev);
-    } else {
+    } else if (type == 2) {
         create_v2m(vbi, pic);
     }
 }
@@ -1375,7 +1377,7 @@ static void machvirt_init(MachineState *machine)
 
     create_flash(vbi, sysmem, secure_sysmem ? secure_sysmem : sysmem);
 
-    create_gic(vbi, pic, gic_version, vms->secure);
+    create_gic(vbi, pic, gic_version, vms->secure, vmc->no_its);
 
     fdt_add_pmu_nodes(vbi, gic_version);
 
@@ -1407,6 +1409,7 @@ static void machvirt_init(MachineState *machine)
     guest_info->irqmap = vbi->irqmap;
     guest_info->use_highmem = vms->highmem;
     guest_info->gic_version = gic_version;
+    guest_info->no_its = vmc->no_its;
     guest_info_state->machine_done.notify = virt_guest_info_machine_done;
     qemu_add_machine_init_done_notifier(&guest_info_state->machine_done);
 
@@ -1561,8 +1564,12 @@ static void virt_2_7_instance_init(Object *obj)
 
 static void virt_machine_2_7_options(MachineClass *mc)
 {
+    VirtMachineClass *vmc = VIRT_MACHINE_CLASS(OBJECT_CLASS(mc));
+
     virt_machine_2_8_options(mc);
     SET_MACHINE_COMPAT(mc, VIRT_COMPAT_2_7);
+    /* ITS was introduced with 2.8 */
+    vmc->no_its = true;
 }
 DEFINE_VIRT_MACHINE(2, 7)
 

diff --git a/include/hw/arm/virt-acpi-build.h b/include/hw/arm/virt-acpi-build.h
index e43330ad659b0dc6e8ec5b4c5d54e2922e850378..f5ec749b8fea374a4b2e15bcfc35ec81bb7945dd 100644 (file)
--- a/include/hw/arm/virt-acpi-build.h
+++ b/include/hw/arm/virt-acpi-build.h
@@ -33,6 +33,7 @@ typedef struct VirtGuestInfo {
     const int *irqmap;
     bool use_highmem;
     int gic_version;
+    bool no_its;
 } VirtGuestInfo;