@@ -622,6 +622,11 @@ static void loongarch_set_lsx(Object *obj, bool value, Error **errp)
uint32_t val;
cpu->lsx = value ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
+ if ((cpu->lsx == ON_OFF_AUTO_OFF) && (cpu->lasx == ON_OFF_AUTO_ON)) {
+ error_setg(errp, "Failed to disable LSX since LASX is enabled");
+ return;
+ }
+
if (kvm_enabled()) {
/* kvm feature detection in function kvm_arch_init_vcpu */
return;
@@ -641,29 +646,35 @@ static void loongarch_set_lsx(Object *obj, bool value, Error **errp)
static bool loongarch_get_lasx(Object *obj, Error **errp)
{
- LoongArchCPU *cpu = LOONGARCH_CPU(obj);
- bool ret;
-
- if (FIELD_EX32(cpu->env.cpucfg[2], CPUCFG2, LASX)) {
- ret = true;
- } else {
- ret = false;
- }
- return ret;
+ return LOONGARCH_CPU(obj)->lasx != ON_OFF_AUTO_OFF;
}
static void loongarch_set_lasx(Object *obj, bool value, Error **errp)
{
LoongArchCPU *cpu = LOONGARCH_CPU(obj);
+ uint32_t val;
- if (value) {
- if (!FIELD_EX32(cpu->env.cpucfg[2], CPUCFG2, LSX)) {
- cpu->env.cpucfg[2] = FIELD_DP32(cpu->env.cpucfg[2], CPUCFG2, LSX, 1);
- }
- cpu->env.cpucfg[2] = FIELD_DP32(cpu->env.cpucfg[2], CPUCFG2, LASX, 1);
- } else {
- cpu->env.cpucfg[2] = FIELD_DP32(cpu->env.cpucfg[2], CPUCFG2, LASX, 0);
+ cpu->lasx = value ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
+ if ((cpu->lsx == ON_OFF_AUTO_OFF) && (cpu->lasx == ON_OFF_AUTO_ON)) {
+ error_setg(errp, "Failed to enable LASX since lSX is disabled");
+ return;
}
+
+ if (kvm_enabled()) {
+ /* kvm feature detection in function kvm_arch_init_vcpu */
+ return;
+ }
+
+ /* LASX feature detection in TCG mode */
+ val = cpu->env.cpucfg[2];
+ if (cpu->lasx == ON_OFF_AUTO_ON) {
+ if (FIELD_EX32(val, CPUCFG2, LASX) == 0) {
+ error_setg(errp, "Failed to enable LASX in TCG mode");
+ return;
+ }
+ }
+
+ cpu->env.cpucfg[2] = FIELD_DP32(val, CPUCFG2, LASX, value);
}
static bool loongarch_get_lbt(Object *obj, Error **errp)
@@ -695,6 +706,7 @@ void loongarch_cpu_post_init(Object *obj)
LoongArchCPU *cpu = LOONGARCH_CPU(obj);
cpu->lsx = ON_OFF_AUTO_AUTO;
+ cpu->lasx = ON_OFF_AUTO_AUTO;
object_property_add_bool(obj, "lsx", loongarch_get_lsx,
loongarch_set_lsx);
object_property_add_bool(obj, "lasx", loongarch_get_lasx,
@@ -284,6 +284,7 @@ typedef struct LoongArchTLB LoongArchTLB;
enum loongarch_features {
LOONGARCH_FEATURE_LSX,
+ LOONGARCH_FEATURE_LASX,
LOONGARCH_FEATURE_LBT, /* loongson binary translation extension */
LOONGARCH_FEATURE_PMU,
};
@@ -406,6 +407,7 @@ struct ArchCPU {
OnOffAuto lbt;
OnOffAuto pmu;
OnOffAuto lsx;
+ OnOffAuto lasx;
/* 'compatible' string for this CPU for Linux device trees */
const char *dtb_compatible;
@@ -827,6 +827,32 @@ static bool kvm_feature_supported(CPUState *cs, enum loongarch_features feature)
}
return false;
+ case LOONGARCH_FEATURE_LASX:
+ attr.group = KVM_LOONGARCH_VM_FEAT_CTRL;
+ attr.attr = KVM_LOONGARCH_VM_FEAT_LASX;
+ ret = kvm_vm_ioctl(kvm_state, KVM_HAS_DEVICE_ATTR, &attr);
+ if (ret == 0) {
+ return true;
+ }
+
+ /* Fallback to old kernel detect interface */
+ val = 0;
+ attr.group = KVM_LOONGARCH_VCPU_CPUCFG;
+ /* Cpucfg2 */
+ attr.attr = 2;
+ attr.addr = (uint64_t)&val;
+ ret = kvm_vcpu_ioctl(cs, KVM_HAS_DEVICE_ATTR, &attr);
+ if (!ret) {
+ ret = kvm_vcpu_ioctl(cs, KVM_GET_DEVICE_ATTR, &attr);
+ if (ret) {
+ return false;
+ }
+
+ ret = FIELD_EX32((uint32_t)val, CPUCFG2, LASX);
+ return (ret != 0);
+ }
+ return false;
+
case LOONGARCH_FEATURE_LBT:
/*
* Return all if all the LBT features are supported such as:
@@ -878,6 +904,28 @@ static int kvm_cpu_check_lsx(CPUState *cs, Error **errp)
return 0;
}
+static int kvm_cpu_check_lasx(CPUState *cs, Error **errp)
+{
+ CPULoongArchState *env = cpu_env(cs);
+ LoongArchCPU *cpu = LOONGARCH_CPU(cs);
+ bool kvm_supported;
+
+ kvm_supported = kvm_feature_supported(cs, LOONGARCH_FEATURE_LASX);
+ env->cpucfg[2] = FIELD_DP32(env->cpucfg[2], CPUCFG2, LASX, 0);
+ if (cpu->lasx == ON_OFF_AUTO_ON) {
+ if (kvm_supported) {
+ env->cpucfg[2] = FIELD_DP32(env->cpucfg[2], CPUCFG2, LASX, 1);
+ } else {
+ error_setg(errp, "'lasx' feature not supported by KVM on host");
+ return -ENOTSUP;
+ }
+ } else if ((cpu->lasx == ON_OFF_AUTO_AUTO) && kvm_supported) {
+ env->cpucfg[2] = FIELD_DP32(env->cpucfg[2], CPUCFG2, LASX, 1);
+ }
+
+ return 0;
+}
+
static int kvm_cpu_check_lbt(CPUState *cs, Error **errp)
{
CPULoongArchState *env = cpu_env(cs);
@@ -943,6 +991,11 @@ int kvm_arch_init_vcpu(CPUState *cs)
error_report_err(local_err);
}
+ ret = kvm_cpu_check_lasx(cs, &local_err);
+ if (ret < 0) {
+ error_report_err(local_err);
+ }
+
ret = kvm_cpu_check_lbt(cs, &local_err);
if (ret < 0) {
error_report_err(local_err);
Like LSX feature, add type OnOffAuto for LASX feature setting. Signed-off-by: Bibo Mao <maobibo@loongson.cn> --- target/loongarch/cpu.c | 44 +++++++++++++++++++------------ target/loongarch/cpu.h | 2 ++ target/loongarch/kvm/kvm.c | 53 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 83 insertions(+), 16 deletions(-)