@@ -664,12 +664,36 @@ static void loongarch_set_lasx(Object *obj, bool value, Error **errp)
}
}
+static bool loongarch_get_lbt(Object *obj, Error **errp)
+{
+ return LOONGARCH_CPU(obj)->lbt != ON_OFF_AUTO_OFF;
+}
+
+static void loongarch_set_lbt(Object *obj, bool value, Error **errp)
+{
+ LoongArchCPU *cpu = LOONGARCH_CPU(obj);
+
+ cpu->lbt = value ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
+}
+
void loongarch_cpu_post_init(Object *obj)
{
+ LoongArchCPU *cpu = LOONGARCH_CPU(obj);
+
object_property_add_bool(obj, "lsx", loongarch_get_lsx,
loongarch_set_lsx);
object_property_add_bool(obj, "lasx", loongarch_get_lasx,
loongarch_set_lasx);
+ /* lbt is enabled only in kvm mode, not supported in tcg mode */
+ if (kvm_enabled()) {
+ cpu->lbt = ON_OFF_AUTO_AUTO;
+ object_property_add_bool(obj, "lbt", loongarch_get_lbt,
+ loongarch_set_lbt);
+ object_property_set_description(obj, "lbt",
+ "Set off to disable Binary Tranlation.");
+ } else {
+ cpu->lbt = ON_OFF_AUTO_OFF;
+ }
}
static void loongarch_cpu_init(Object *obj)
@@ -153,6 +153,7 @@ FIELD(CPUCFG2, LLFTP_VER, 15, 3)
FIELD(CPUCFG2, LBT_X86, 18, 1)
FIELD(CPUCFG2, LBT_ARM, 19, 1)
FIELD(CPUCFG2, LBT_MIPS, 20, 1)
+FIELD(CPUCFG2, LBT_ALL, 18, 3)
FIELD(CPUCFG2, LSPW, 21, 1)
FIELD(CPUCFG2, LAM, 22, 1)
@@ -281,6 +282,10 @@ struct LoongArchTLB {
typedef struct LoongArchTLB LoongArchTLB;
#endif
+enum loongarch_features {
+ LOONGARCH_FEATURE_LBT, /* loongson binary translation extension */
+};
+
typedef struct CPUArchState {
uint64_t gpr[32];
uint64_t pc;
@@ -381,6 +386,7 @@ struct ArchCPU {
CPULoongArchState env;
QEMUTimer timer;
uint32_t phy_id;
+ OnOffAuto lbt;
/* 'compatible' string for this CPU for Linux device trees */
const char *dtb_compatible;
@@ -9,6 +9,7 @@
#include <sys/ioctl.h>
#include <linux/kvm.h>
+#include "qapi/error.h"
#include "qemu/timer.h"
#include "qemu/error-report.h"
#include "qemu/main-loop.h"
@@ -666,17 +667,71 @@ static void kvm_loongarch_vm_stage_change(void *opaque, bool running,
}
}
+static bool kvm_feature_supported(CPUState *cs, enum loongarch_features feature)
+{
+ int ret;
+ struct kvm_device_attr attr;
+
+ switch (feature) {
+ case LOONGARCH_FEATURE_LBT:
+ /*
+ * Return all if all the LBT features are supported such as:
+ * KVM_LOONGARCH_VM_FEAT_X86BT
+ * KVM_LOONGARCH_VM_FEAT_ARMBT
+ * KVM_LOONGARCH_VM_FEAT_MIPSBT
+ */
+ attr.group = KVM_LOONGARCH_VM_FEAT_CTRL;
+ attr.attr = KVM_LOONGARCH_VM_FEAT_X86BT;
+ ret = kvm_vm_ioctl(kvm_state, KVM_HAS_DEVICE_ATTR, &attr);
+ attr.attr = KVM_LOONGARCH_VM_FEAT_ARMBT;
+ ret |= kvm_vm_ioctl(kvm_state, KVM_HAS_DEVICE_ATTR, &attr);
+ attr.attr = KVM_LOONGARCH_VM_FEAT_MIPSBT;
+ ret |= kvm_vm_ioctl(kvm_state, KVM_HAS_DEVICE_ATTR, &attr);
+ return (ret == 0);
+ default:
+ return false;
+ }
+}
+
+static int kvm_cpu_check_lbt(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_LBT);
+ if (cpu->lbt == ON_OFF_AUTO_ON) {
+ if (kvm_supported) {
+ env->cpucfg[2] = FIELD_DP32(env->cpucfg[2], CPUCFG2, LBT_ALL, 7);
+ } else {
+ error_setg(errp, "'lbt' feature not supported by KVM on this host");
+ return -ENOTSUP;
+ }
+ } else if ((cpu->lbt == ON_OFF_AUTO_AUTO) && kvm_supported) {
+ env->cpucfg[2] = FIELD_DP32(env->cpucfg[2], CPUCFG2, LBT_ALL, 7);
+ }
+
+ return 0;
+}
+
int kvm_arch_init_vcpu(CPUState *cs)
{
uint64_t val;
+ int ret;
+ Error *local_err = NULL;
+ ret = 0;
qemu_add_vm_change_state_handler(kvm_loongarch_vm_stage_change, cs);
if (!kvm_get_one_reg(cs, KVM_REG_LOONGARCH_DEBUG_INST, &val)) {
brk_insn = val;
}
- return 0;
+ ret = kvm_cpu_check_lbt(cs, &local_err);
+ if (ret < 0) {
+ error_report_err(local_err);
+ }
+ return ret;
}
int kvm_arch_destroy_vcpu(CPUState *cs)
@@ -40,7 +40,7 @@ CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
}
static const char *cpu_model_advertised_features[] = {
- "lsx", "lasx", NULL
+ "lsx", "lasx", "lbt", NULL
};
CpuModelExpansionInfo *qmp_query_cpu_model_expansion(CpuModelExpansionType type,
Loongson Binary Translation (LBT) is used to accelerate binary translation, which contains 4 scratch registers (scr0 to scr3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop). Now LBT feature is added in kvm mode, not supported in TCG mode since it is not emulated. Feature variable lbt is added with OnOffAuto type, If lbt feature is not supported with KVM host, it reports error if there is lbt=on command line. If there is no any command line about lbt parameter, it checks whether KVM host supports lbt feature and set the corresponding value in cpucfg. Signed-off-by: Bibo Mao <maobibo@loongson.cn> --- target/loongarch/cpu.c | 24 +++++++++++ target/loongarch/cpu.h | 6 +++ target/loongarch/kvm/kvm.c | 57 ++++++++++++++++++++++++++- target/loongarch/loongarch-qmp-cmds.c | 2 +- 4 files changed, 87 insertions(+), 2 deletions(-)