target/arm: Create tagged ram when MTE is enabled
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20200626033144.790098-44-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index afe81e9..5050e18 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -1252,6 +1252,25 @@
if (kvm_enabled()) {
kvm_arm_add_vcpu_properties(obj);
}
+
+#ifndef CONFIG_USER_ONLY
+ if (arm_feature(&cpu->env, ARM_FEATURE_AARCH64) &&
+ cpu_isar_feature(aa64_mte, cpu)) {
+ object_property_add_link(obj, "tag-memory",
+ TYPE_MEMORY_REGION,
+ (Object **)&cpu->tag_memory,
+ qdev_prop_allow_set_link_before_realize,
+ OBJ_PROP_LINK_STRONG);
+
+ if (arm_feature(&cpu->env, ARM_FEATURE_EL3)) {
+ object_property_add_link(obj, "secure-tag-memory",
+ TYPE_MEMORY_REGION,
+ (Object **)&cpu->secure_tag_memory,
+ qdev_prop_allow_set_link_before_realize,
+ OBJ_PROP_LINK_STRONG);
+ }
+ }
+#endif
}
static void arm_cpu_finalizefn(Object *obj)
@@ -1741,18 +1760,43 @@
#ifndef CONFIG_USER_ONLY
MachineState *ms = MACHINE(qdev_get_machine());
unsigned int smp_cpus = ms->smp.cpus;
+ bool has_secure = cpu->has_el3 || arm_feature(env, ARM_FEATURE_M_SECURITY);
- if (cpu->has_el3 || arm_feature(env, ARM_FEATURE_M_SECURITY)) {
- cs->num_ases = 2;
+ /*
+ * We must set cs->num_ases to the final value before
+ * the first call to cpu_address_space_init.
+ */
+ if (cpu->tag_memory != NULL) {
+ cs->num_ases = 3 + has_secure;
+ } else {
+ cs->num_ases = 1 + has_secure;
+ }
+ if (has_secure) {
if (!cpu->secure_memory) {
cpu->secure_memory = cs->memory;
}
cpu_address_space_init(cs, ARMASIdx_S, "cpu-secure-memory",
cpu->secure_memory);
- } else {
- cs->num_ases = 1;
}
+
+ if (cpu->tag_memory != NULL) {
+ cpu_address_space_init(cs, ARMASIdx_TagNS, "cpu-tag-memory",
+ cpu->tag_memory);
+ if (has_secure) {
+ cpu_address_space_init(cs, ARMASIdx_TagS, "cpu-tag-memory",
+ cpu->secure_tag_memory);
+ }
+ } else if (cpu_isar_feature(aa64_mte, cpu)) {
+ /*
+ * Since there is no tag memory, we can't meaningfully support MTE
+ * to its fullest. To avoid problems later, when we would come to
+ * use the tag memory, downgrade support to insns only.
+ */
+ cpu->isar.id_aa64pfr1 =
+ FIELD_DP64(cpu->isar.id_aa64pfr1, ID_AA64PFR1, MTE, 1);
+ }
+
cpu_address_space_init(cs, ARMASIdx_NS, "cpu-memory", cs->memory);
/* No core_count specified, default to smp_cpus. */
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index 513c389..cf99dcc 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -792,6 +792,10 @@
/* MemoryRegion to use for secure physical accesses */
MemoryRegion *secure_memory;
+ /* MemoryRegion to use for allocation tag accesses */
+ MemoryRegion *tag_memory;
+ MemoryRegion *secure_tag_memory;
+
/* For v8M, pointer to the IDAU interface provided by board/SoC */
Object *idau;
@@ -2985,6 +2989,8 @@
typedef enum ARMASIdx {
ARMASIdx_NS = 0,
ARMASIdx_S = 1,
+ ARMASIdx_TagNS = 2,
+ ARMASIdx_TagS = 3,
} ARMASIdx;
/* Return the Exception Level targeted by debug exceptions. */