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target-arm: kvm: save/restore mp state
This adds the saving and restore of the current Multi-Processing state of the machine. While the KVM_GET/SET_MP_STATE API exposes a number of potential states for x86 we only use two for ARM. Either the process is running or not. We then save this state into the cpu_powered TCG state to avoid changing the serialisation format. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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@ -28,6 +28,8 @@ const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
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KVM_CAP_LAST_INFO
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};
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static bool cap_has_mp_state;
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int kvm_arm_vcpu_init(CPUState *cs)
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{
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ARMCPU *cpu = ARM_CPU(cs);
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@ -157,6 +159,8 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
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*/
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kvm_async_interrupts_allowed = true;
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cap_has_mp_state = kvm_check_extension(s, KVM_CAP_MP_STATE);
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type_register_static(&host_arm_cpu_type_info);
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return 0;
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@ -458,6 +462,46 @@ void kvm_arm_reset_vcpu(ARMCPU *cpu)
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}
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}
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/*
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* Update KVM's MP_STATE based on what QEMU thinks it is
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*/
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int kvm_arm_sync_mpstate_to_kvm(ARMCPU *cpu)
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{
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if (cap_has_mp_state) {
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struct kvm_mp_state mp_state = {
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.mp_state =
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cpu->powered_off ? KVM_MP_STATE_STOPPED : KVM_MP_STATE_RUNNABLE
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};
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int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MP_STATE, &mp_state);
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if (ret) {
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fprintf(stderr, "%s: failed to set MP_STATE %d/%s\n",
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__func__, ret, strerror(-ret));
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return -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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* Sync the KVM MP_STATE into QEMU
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*/
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int kvm_arm_sync_mpstate_to_qemu(ARMCPU *cpu)
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{
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if (cap_has_mp_state) {
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struct kvm_mp_state mp_state;
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int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_MP_STATE, &mp_state);
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if (ret) {
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fprintf(stderr, "%s: failed to get MP_STATE %d/%s\n",
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__func__, ret, strerror(-ret));
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abort();
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}
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cpu->powered_off = (mp_state.mp_state == KVM_MP_STATE_STOPPED);
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}
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return 0;
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}
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void kvm_arch_pre_run(CPUState *cs, struct kvm_run *run)
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{
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}
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@ -356,6 +356,8 @@ int kvm_arch_put_registers(CPUState *cs, int level)
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return EINVAL;
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}
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kvm_arm_sync_mpstate_to_kvm(cpu);
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return ret;
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}
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@ -427,5 +429,7 @@ int kvm_arch_get_registers(CPUState *cs)
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*/
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write_list_to_cpustate(cpu);
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kvm_arm_sync_mpstate_to_qemu(cpu);
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return 0;
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}
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@ -211,6 +211,8 @@ int kvm_arch_put_registers(CPUState *cs, int level)
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return EINVAL;
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}
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kvm_arm_sync_mpstate_to_kvm(cpu);
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/* TODO:
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* FP state
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*/
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@ -310,6 +312,8 @@ int kvm_arch_get_registers(CPUState *cs)
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*/
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write_list_to_cpustate(cpu);
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kvm_arm_sync_mpstate_to_qemu(cpu);
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/* TODO: other registers */
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return ret;
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}
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@ -162,6 +162,23 @@ typedef struct ARMHostCPUClass {
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*/
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bool kvm_arm_get_host_cpu_features(ARMHostCPUClass *ahcc);
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/**
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* kvm_arm_sync_mpstate_to_kvm
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* @cpu: ARMCPU
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*
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* If supported set the KVM MP_STATE based on QEMU's model.
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*/
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int kvm_arm_sync_mpstate_to_kvm(ARMCPU *cpu);
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/**
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* kvm_arm_sync_mpstate_to_qemu
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* @cpu: ARMCPU
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*
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* If supported get the MP_STATE from KVM and store in QEMU's model.
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*/
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int kvm_arm_sync_mpstate_to_qemu(ARMCPU *cpu);
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#endif
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#endif
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