@@ -1999,6 +1999,18 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp)
return;
}
+ /*
+ * If we failed to retrieve the set of writable ID registers for the "host"
+ * CPU model, report it here. No error if the interface for discovering
+ * writable ID registers is not available.
+ * In case we did get the set of writable ID registers, set the features to
+ * the configured values here and perform some sanity checks.
+ */
+ if (cpu->writable_id_regs == WRITABLE_ID_REGS_FAILED) {
+ error_setg(errp, "Failed to discover writable id registers");
+ return;
+ }
+
if (!cpu->gt_cntfrq_hz) {
/*
* 0 means "the board didn't set a value, use the default". (We also
@@ -20,6 +20,7 @@
#include "qemu/osdep.h"
#include "qapi/error.h"
+#include "qemu/error-report.h"
#include "cpu.h"
#include "cpregs.h"
#include "qemu/module.h"
@@ -36,6 +37,7 @@
#include "cpu-features.h"
#include "cpregs.h"
#include "cpu-custom.h"
+#include "trace.h"
void arm_cpu_sve_finalize(ARMCPU *cpu, Error **errp)
{
@@ -713,15 +715,161 @@ static void aarch64_a53_initfn(Object *obj)
define_cortex_a72_a57_a53_cp_reginfo(cpu);
}
+#ifdef CONFIG_KVM
+
+static ARM64SysRegField *get_field(int i, ARM64SysReg *reg)
+{
+ GList *l;
+
+ for (l = reg->fields; l; l = l->next) {
+ ARM64SysRegField *field = (ARM64SysRegField *)l->data;
+
+ if (i >= field->lower && i <= field->upper) {
+ return field;
+ }
+ }
+ return NULL;
+}
+
+static void set_sysreg_prop(Object *obj, Visitor *v,
+ const char *name, void *opaque,
+ Error **errp)
+{
+ ARM64SysRegField *field = (ARM64SysRegField *)opaque;
+ ARMCPU *cpu = ARM_CPU(obj);
+ IdRegMap *idregs = &cpu->isar.idregs;
+ uint64_t old, value, mask;
+ int lower = field->lower;
+ int upper = field->upper;
+ int length = upper - lower + 1;
+ int index = field->index;
+
+ if (!visit_type_uint64(v, name, &value, errp)) {
+ return;
+ }
+
+ if (length < 64 && value > ((1 << length) - 1)) {
+ error_setg(errp,
+ "idreg %s set value (0x%lx) exceeds length of field (%d)!",
+ name, value, length);
+ return;
+ }
+
+ mask = MAKE_64BIT_MASK(lower, length);
+ value = value << lower;
+ old = idregs->regs[index];
+ idregs->regs[index] = old & ~mask;
+ idregs->regs[index] |= value;
+ trace_set_sysreg_prop(name, old, mask, value, idregs->regs[index]);
+}
+
+static void get_sysreg_prop(Object *obj, Visitor *v,
+ const char *name, void *opaque,
+ Error **errp)
+{
+ ARM64SysRegField *field = (ARM64SysRegField *)opaque;
+ ARMCPU *cpu = ARM_CPU(obj);
+ IdRegMap *idregs = &cpu->isar.idregs;
+ int index = field->index;
+
+ error_report("%s %s", __func__, name);
+ visit_type_uint64(v, name, &idregs->regs[index], errp);
+ trace_get_sysreg_prop(name, idregs->regs[index]);
+}
+
+/*
+ * decode_idreg_writemap: Generate props for writable fields
+ *
+ * @obj: CPU object
+ * @index: index of the sysreg
+ * @map: writable map for the sysreg
+ * @reg: description of the sysreg
+ */
+static int
+decode_idreg_writemap(Object *obj, int index, uint64_t map, ARM64SysReg *reg)
+{
+ int i = ctz64(map);
+ int nb_sysreg_props = 0;
+
+ while (map) {
+ ARM64SysRegField *field = get_field(i, reg);
+ int lower, upper;
+ uint64_t mask;
+ char *prop_name;
+
+ if (!field) {
+ /* the field cannot be matched to any know id named field */
+ warn_report("%s bit %d of %s is writable but cannot be matched",
+ __func__, i, reg->name);
+ warn_report("%s is cpu-sysreg-properties.c up to date?", __func__);
+ map = map & ~BIT_ULL(i);
+ i = ctz64(map);
+ continue;
+ }
+ lower = field->lower;
+ upper = field->upper;
+ prop_name = g_strdup_printf("SYSREG_%s_%s", reg->name, field->name);
+ trace_decode_idreg_writemap(field->name, lower, upper, prop_name);
+ object_property_add(obj, prop_name, "uint64",
+ get_sysreg_prop, set_sysreg_prop, NULL, field);
+ nb_sysreg_props++;
+
+ mask = MAKE_64BIT_MASK(lower, upper - lower + 1);
+ map = map & ~mask;
+ i = ctz64(map);
+ }
+ trace_nb_sysreg_props(reg->name, nb_sysreg_props);
+ return 0;
+}
+
+/* analyze the writable mask and generate properties for writable fields */
+static int expose_idreg_properties(Object *obj, IdRegMap *map,
+ ARM64SysReg *regs)
+{
+ int i;
+
+ for (i = 0; i < NR_ID_REGS; i++) {
+ uint64_t mask = map->regs[i];
+
+ if (mask) {
+ /* reg @i has some writable fields, decode them */
+ decode_idreg_writemap(obj, i, mask, ®s[i]);
+ }
+ }
+ return 0;
+}
+
+#endif
+
static void aarch64_host_initfn(Object *obj)
{
#if defined(CONFIG_KVM)
ARMCPU *cpu = ARM_CPU(obj);
- kvm_arm_set_cpu_features_from_host(cpu, false);
+ bool expose_id_regs = true;
+ int ret;
+
+ cpu->writable_map = g_malloc(sizeof(IdRegMap));
+
+ /* discover via KVM_ARM_GET_REG_WRITABLE_MASKS */
+ ret = kvm_arm_get_writable_id_regs(cpu, cpu->writable_map);
+ if (ret == -ENOSYS) {
+ /* legacy: continue without writable id regs */
+ expose_id_regs = false;
+ } else if (ret) {
+ /* function will have marked an error */
+ return;
+ }
+
+ kvm_arm_set_cpu_features_from_host(cpu, expose_id_regs);
if (arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) {
aarch64_add_sve_properties(obj);
aarch64_add_pauth_properties(obj);
}
+ if (expose_id_regs) {
+ /* generate SYSREG properties according to writable masks */
+ expose_idreg_properties(obj, cpu->writable_map, arm64_id_regs);
+ }
+
#elif defined(CONFIG_HVF)
ARMCPU *cpu = ARM_CPU(obj);
hvf_arm_set_cpu_features_from_host(cpu, false);
@@ -15,3 +15,9 @@ arm_gt_update_irq(int timer, int irqstate) "gt_update_irq: timer %d irqstate %d"
kvm_arm_fixup_msi_route(uint64_t iova, uint64_t gpa) "MSI iova = 0x%"PRIx64" is translated into 0x%"PRIx64
get_host_cpu_idregs(const char *name, uint64_t value) "scratch vcpu gost value for %s is 0x%"PRIx64
kvm_arm_writable_idregs_to_cpreg_list(const char *name, uint64_t previous, uint64_t new) "%s overwrite default 0x%"PRIx64" with 0x%"PRIx64
+
+# cpu64.c
+decode_idreg_writemap(const char* name, int lower, int upper, char *prop_name) "%s [%d:%d] is writable (prop %s)"
+get_sysreg_prop(const char *name, uint64_t value) "%s 0x%"PRIx64
+set_sysreg_prop(const char *name, uint64_t old, uint64_t mask, uint64_t field_value, uint64_t new) "%s old reg value=0x%"PRIx64" mask=0x%"PRIx64" new field value=0x%"PRIx64" new reg value=0x%"PRIx64
+nb_sysreg_props(const char *name, int count) "%s: %d SYSREG properties"