static int kvm_sbi_ext_v01_handler()

in kvm/vcpu_sbi_v01.c [32:120]

• 81 lines of code
• 18 McCabe index (conditional complexity)

static int kvm_sbi_ext_v01_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
				      unsigned long *out_val,
				      struct kvm_cpu_trap *utrap,
				      bool *exit)
{
	ulong hmask;
	int i, ret = 0;
	u64 next_cycle;
	struct kvm_vcpu *rvcpu;
	struct cpumask cm, hm;
	struct kvm *kvm = vcpu->kvm;
	struct kvm_cpu_context *cp = &vcpu->arch.guest_context;

	switch (cp->a7) {
	case SBI_EXT_0_1_CONSOLE_GETCHAR:
	case SBI_EXT_0_1_CONSOLE_PUTCHAR:
		/*
		 * The CONSOLE_GETCHAR/CONSOLE_PUTCHAR SBI calls cannot be
		 * handled in kernel so we forward these to user-space
		 */
		kvm_riscv_vcpu_sbi_forward(vcpu, run);
		*exit = true;
		break;
	case SBI_EXT_0_1_SET_TIMER:
#if __riscv_xlen == 32
		next_cycle = ((u64)cp->a1 << 32) | (u64)cp->a0;
#else
		next_cycle = (u64)cp->a0;
#endif
		ret = kvm_riscv_vcpu_timer_next_event(vcpu, next_cycle);
		break;
	case SBI_EXT_0_1_CLEAR_IPI:
		ret = kvm_riscv_vcpu_unset_interrupt(vcpu, IRQ_VS_SOFT);
		break;
	case SBI_EXT_0_1_SEND_IPI:
		if (cp->a0)
			hmask = kvm_riscv_vcpu_unpriv_read(vcpu, false, cp->a0,
							   utrap);
		else
			hmask = (1UL << atomic_read(&kvm->online_vcpus)) - 1;
		if (utrap->scause)
			break;

		for_each_set_bit(i, &hmask, BITS_PER_LONG) {
			rvcpu = kvm_get_vcpu_by_id(vcpu->kvm, i);
			ret = kvm_riscv_vcpu_set_interrupt(rvcpu, IRQ_VS_SOFT);
			if (ret < 0)
				break;
		}
		break;
	case SBI_EXT_0_1_SHUTDOWN:
		kvm_sbi_system_shutdown(vcpu, run, KVM_SYSTEM_EVENT_SHUTDOWN);
		*exit = true;
		break;
	case SBI_EXT_0_1_REMOTE_FENCE_I:
	case SBI_EXT_0_1_REMOTE_SFENCE_VMA:
	case SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID:
		if (cp->a0)
			hmask = kvm_riscv_vcpu_unpriv_read(vcpu, false, cp->a0,
							   utrap);
		else
			hmask = (1UL << atomic_read(&kvm->online_vcpus)) - 1;
		if (utrap->scause)
			break;

		cpumask_clear(&cm);
		for_each_set_bit(i, &hmask, BITS_PER_LONG) {
			rvcpu = kvm_get_vcpu_by_id(vcpu->kvm, i);
			if (rvcpu->cpu < 0)
				continue;
			cpumask_set_cpu(rvcpu->cpu, &cm);
		}
		riscv_cpuid_to_hartid_mask(&cm, &hm);
		if (cp->a7 == SBI_EXT_0_1_REMOTE_FENCE_I)
			ret = sbi_remote_fence_i(cpumask_bits(&hm));
		else if (cp->a7 == SBI_EXT_0_1_REMOTE_SFENCE_VMA)
			ret = sbi_remote_hfence_vvma(cpumask_bits(&hm),
						cp->a1, cp->a2);
		else
			ret = sbi_remote_hfence_vvma_asid(cpumask_bits(&hm),
						cp->a1, cp->a2, cp->a3);
		break;
	default:
		ret = -EINVAL;
		break;
	};

	return ret;
}