[RFC PATCH 12/12] hw/arm/virt: Set SMMU OAS based on CPU PARANGE

[Mostafa Saleh]

Use the new SMMU property to make the SMMU OAS match the CPU PARANGE.
That's according to SMMU manual ARM IHI 0070F.b:
    6.3.6 SMMU_IDR5, OAS must match the system physical address size.

Signed-off-by: Mostafa Saleh <smostafa@google.com>
---
 hw/arm/virt.c      | 14 ++++++++++++--
 target/arm/cpu.h   |  2 ++
 target/arm/cpu64.c |  5 +++++
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 0af1943697..599c0f752b 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -235,6 +235,13 @@ static bool ns_el2_virt_timer_present(void)
         arm_feature(env, ARM_FEATURE_EL2) && cpu_isar_feature(aa64_vh, cpu);
 }
 
+/* We rely on CPU to define system OAS. */
+static int32_t get_system_oas(void)
+{
+    ARMCPU *cpu = ARM_CPU(qemu_get_cpu(0));
+    return cpu_arm_get_oas(cpu);
+}
+
 static void create_fdt(VirtMachineState *vms)
 {
     MachineState *ms = MACHINE(vms);
@@ -1340,7 +1347,7 @@ static void create_pcie_irq_map(const MachineState *ms,
 }
 
 static void create_smmu(const VirtMachineState *vms,
-                        PCIBus *bus)
+                        PCIBus *bus, int32_t oas)
 {
     char *node;
     const char compat[] = "arm,smmu-v3";
@@ -1360,6 +1367,9 @@ static void create_smmu(const VirtMachineState *vms,
 
     object_property_set_link(OBJECT(dev), "primary-bus", OBJECT(bus),
                              &error_abort);
+
+    qdev_prop_set_uint64(dev, "oas", oas);
+
     sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
     sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, base);
     for (i = 0; i < NUM_SMMU_IRQS; i++) {
@@ -1534,7 +1544,7 @@ static void create_pcie(VirtMachineState *vms)
 
         switch (vms->iommu) {
         case VIRT_IOMMU_SMMUV3:
-            create_smmu(vms, vms->bus);
+            create_smmu(vms, vms->bus, get_system_oas());
             qemu_fdt_setprop_cells(ms->fdt, nodename, "iommu-map",
                                    0x0, vms->iommu_phandle, 0x0, 0x10000);
             break;
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index a5b3d8f7da..14ef1a9d37 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -3408,4 +3408,6 @@ static inline target_ulong cpu_untagged_addr(CPUState 
*cs, target_ulong x)
 }
 #endif
 
+int32_t cpu_arm_get_oas(ARMCPU *cpu);
+
 #endif
diff --git a/target/arm/cpu64.c b/target/arm/cpu64.c
index 985b1efe16..08da83c082 100644
--- a/target/arm/cpu64.c
+++ b/target/arm/cpu64.c
@@ -787,6 +787,11 @@ static const gchar *aarch64_gdb_arch_name(CPUState *cs)
     return "aarch64";
 }
 
+int32_t cpu_arm_get_oas(ARMCPU *cpu)
+{
+    return FIELD_EX64(cpu->isar.id_aa64mmfr0, ID_AA64MMFR0, PARANGE);
+}
+
 static void aarch64_cpu_class_init(ObjectClass *oc, void *data)
 {
     CPUClass *cc = CPU_CLASS(oc);
-- 
2.44.0.396.g6e790dbe36-goog