target/loongarch: Add kvm support dintc
This patch adds Kvm put/get msgint CSRs and check msgint feature. Signed-off-by: Song Gao <gaosong@loongson.cn> Reviewed-by: Bibo Mao <maobibo@loongson.cn> Message-ID: <20260813111000.446232-2-gaosong@loongson.cn>
Song Gao committed
Aug 13, 2026 at 19:09 UTC
dd45df326e420ed5fc3c181b716ff459beb4ac9e
3 files changed
+77
-3
target/loongarch/cpu.c
+2
-3
@@ -451,9 +451,6 @@ static void loongarch_max_initfn(Object *obj)
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cpu->ptw = ON_OFF_AUTO_AUTO;
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if (tcg_enabled()) {
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- cpu->env.cpucfg[1] = FIELD_DP32(cpu->env.cpucfg[1], CPUCFG1, MSG_INT, 1);
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- cpu->msgint = ON_OFF_AUTO_AUTO;
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-
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uint32_t data = cpu->env.cpucfg[2];
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data = FIELD_DP32(data, CPUCFG2, HPTW, 1);
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/* Enable LA v1.1 instructions */
@@ -468,6 +465,8 @@ static void loongarch_max_initfn(Object *obj)
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data = FIELD_DP32(data, CPUCFG3, DBAR_HINTS, 1);
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cpu->env.cpucfg[3] = data;
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}
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+ cpu->env.cpucfg[1] = FIELD_DP32(cpu->env.cpucfg[1], CPUCFG1, MSG_INT, 1);
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+ cpu->msgint = ON_OFF_AUTO_AUTO;
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}
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#if defined(CONFIG_KVM)
target/loongarch/cpu.h
+1
@@ -301,6 +301,7 @@ enum loongarch_features {
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LOONGARCH_FEATURE_PV_IPI,
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LOONGARCH_FEATURE_STEALTIME,
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LOONGARCH_FEATURE_PTW,
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+ LOONGARCH_FEATURE_MSGINT,
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};
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typedef struct LoongArchBT {
target/loongarch/kvm/kvm.c
+74
@@ -36,6 +36,13 @@ const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
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KVM_CAP_LAST_INFO
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};
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+static bool kvm_cpu_has_msgint(CPUState *cs)
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+{
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+ LoongArchCPU *cpu = LOONGARCH_CPU(cs);
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+
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+ return FIELD_EX64(cpu->env.cpucfg[1], CPUCFG1, MSG_INT);
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+}
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+
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static int kvm_get_stealtime(CPUState *cs)
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{
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CPULoongArchState *env = cpu_env(cs);
@@ -362,6 +369,25 @@ static int kvm_loongarch_get_csr(CPUState *cs)
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ret |= kvm_loongarch_get_pmu(cs);
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+ /*
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+ * CSR register MSGIS getting must be put after CSR register CSR_ESTAT,
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+ * Since register CSR_ESTAT will sync software pending MSGINT status to
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+ * hardware register and modify HW CSR MSGIS registers.
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+ */
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+ if (kvm_cpu_has_msgint(cs)) {
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+ ret |= kvm_get_one_reg(cs, KVM_IOC_CSRID(LOONGARCH_CSR_MSGIS(0)),
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+ &sys->CSR_MSGIS[0]);
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+
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+ ret |= kvm_get_one_reg(cs, KVM_IOC_CSRID(LOONGARCH_CSR_MSGIS(1)),
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+ &sys->CSR_MSGIS[1]);
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+
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+ ret |= kvm_get_one_reg(cs, KVM_IOC_CSRID(LOONGARCH_CSR_MSGIS(2)),
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+ &sys->CSR_MSGIS[2]);
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+
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+ ret |= kvm_get_one_reg(cs, KVM_IOC_CSRID(LOONGARCH_CSR_MSGIS(3)),
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+ &sys->CSR_MSGIS[3]);
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+ }
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+
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ret |= kvm_get_one_reg(cs, KVM_IOC_CSRID(LOONGARCH_CSR_TVAL),
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&sys->CSR_TVAL);
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@@ -538,6 +564,20 @@ static int kvm_loongarch_put_csr(CPUState *cs, KvmPutState level)
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ret |= kvm_loongarch_put_pmu(cs);
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+ if (kvm_cpu_has_msgint(cs)) {
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+ ret |= kvm_set_one_reg(cs, KVM_IOC_CSRID(LOONGARCH_CSR_MSGIS(0)),
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+ &sys->CSR_MSGIS[0]);
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+
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+ ret |= kvm_set_one_reg(cs, KVM_IOC_CSRID(LOONGARCH_CSR_MSGIS(1)),
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+ &sys->CSR_MSGIS[1]);
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+
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+ ret |= kvm_set_one_reg(cs, KVM_IOC_CSRID(LOONGARCH_CSR_MSGIS(2)),
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+ &sys->CSR_MSGIS[2]);
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+
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+ ret |= kvm_set_one_reg(cs, KVM_IOC_CSRID(LOONGARCH_CSR_MSGIS(3)),
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+ &sys->CSR_MSGIS[3]);
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+ }
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+
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/*
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* timer cfg must be put at last since it is used to enable
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* guest timer
@@ -993,6 +1033,12 @@ static bool kvm_feature_supported(CPUState *cs, enum loongarch_features feature)
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ret = kvm_vm_ioctl(kvm_state, KVM_HAS_DEVICE_ATTR, &attr);
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return (ret == 0);
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+ case LOONGARCH_FEATURE_MSGINT:
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+ attr.group = KVM_LOONGARCH_VM_FEAT_CTRL;
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+ attr.attr = KVM_LOONGARCH_VM_FEAT_MSGINT;
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+ ret = kvm_vm_ioctl(kvm_state, KVM_HAS_DEVICE_ATTR, &attr);
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+ return (ret == 0);
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+
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default:
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return false;
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}
@@ -1166,6 +1212,28 @@ static int kvm_cpu_check_pv_features(CPUState *cs, Error **errp)
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return 0;
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}
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+static int kvm_cpu_check_msgint(CPUState *cs, Error **errp)
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+{
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+ CPULoongArchState *env = cpu_env(cs);
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+ LoongArchCPU *cpu = LOONGARCH_CPU(cs);
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+ bool kvm_supported;
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+
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+ kvm_supported = kvm_feature_supported(cs, LOONGARCH_FEATURE_MSGINT);
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+ env->cpucfg[1] = FIELD_DP32(env->cpucfg[1], CPUCFG1, MSG_INT, 0);
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+ if (cpu->msgint == ON_OFF_AUTO_ON) {
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+ if (kvm_supported) {
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+ env->cpucfg[1] = FIELD_DP32(env->cpucfg[1], CPUCFG1, MSG_INT, 1);
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+ } else {
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+ error_setg(errp, "'msgint' feature not supported by KVM on this host");
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+ return -ENOTSUP;
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+ }
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+ } else if ((cpu->msgint == ON_OFF_AUTO_AUTO) && kvm_supported) {
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+ env->cpucfg[1] = FIELD_DP32(env->cpucfg[1], CPUCFG1, MSG_INT, 1);
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+ }
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+
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+ return 0;
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+}
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+
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int kvm_arch_pre_create_vcpu(CPUState *cpu, Error **errp)
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{
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return 0;
@@ -1221,6 +1289,12 @@ int kvm_arch_init_vcpu(CPUState *cs)
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return ret;
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}
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+ ret = kvm_cpu_check_msgint(cs, &local_err);
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+ if (ret < 0) {
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+ error_report_err(local_err);
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+ return ret;
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+ }
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+
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return 0;
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}
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