static void kvmppc_complete_mmio_load()

in kvm/powerpc.c [1112:1222]

• 102 lines of code
• 36 McCabe index (conditional complexity)

static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu)
{
	struct kvm_run *run = vcpu->run;
	u64 gpr;

	if (run->mmio.len > sizeof(gpr)) {
		printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
		return;
	}

	if (!vcpu->arch.mmio_host_swabbed) {
		switch (run->mmio.len) {
		case 8: gpr = *(u64 *)run->mmio.data; break;
		case 4: gpr = *(u32 *)run->mmio.data; break;
		case 2: gpr = *(u16 *)run->mmio.data; break;
		case 1: gpr = *(u8 *)run->mmio.data; break;
		}
	} else {
		switch (run->mmio.len) {
		case 8: gpr = swab64(*(u64 *)run->mmio.data); break;
		case 4: gpr = swab32(*(u32 *)run->mmio.data); break;
		case 2: gpr = swab16(*(u16 *)run->mmio.data); break;
		case 1: gpr = *(u8 *)run->mmio.data; break;
		}
	}

	/* conversion between single and double precision */
	if ((vcpu->arch.mmio_sp64_extend) && (run->mmio.len == 4))
		gpr = sp_to_dp(gpr);

	if (vcpu->arch.mmio_sign_extend) {
		switch (run->mmio.len) {
#ifdef CONFIG_PPC64
		case 4:
			gpr = (s64)(s32)gpr;
			break;
#endif
		case 2:
			gpr = (s64)(s16)gpr;
			break;
		case 1:
			gpr = (s64)(s8)gpr;
			break;
		}
	}

	switch (vcpu->arch.io_gpr & KVM_MMIO_REG_EXT_MASK) {
	case KVM_MMIO_REG_GPR:
		kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
		break;
	case KVM_MMIO_REG_FPR:
		if (vcpu->kvm->arch.kvm_ops->giveup_ext)
			vcpu->kvm->arch.kvm_ops->giveup_ext(vcpu, MSR_FP);

		VCPU_FPR(vcpu, vcpu->arch.io_gpr & KVM_MMIO_REG_MASK) = gpr;
		break;
#ifdef CONFIG_PPC_BOOK3S
	case KVM_MMIO_REG_QPR:
		vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr;
		break;
	case KVM_MMIO_REG_FQPR:
		VCPU_FPR(vcpu, vcpu->arch.io_gpr & KVM_MMIO_REG_MASK) = gpr;
		vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr;
		break;
#endif
#ifdef CONFIG_VSX
	case KVM_MMIO_REG_VSX:
		if (vcpu->kvm->arch.kvm_ops->giveup_ext)
			vcpu->kvm->arch.kvm_ops->giveup_ext(vcpu, MSR_VSX);

		if (vcpu->arch.mmio_copy_type == KVMPPC_VSX_COPY_DWORD)
			kvmppc_set_vsr_dword(vcpu, gpr);
		else if (vcpu->arch.mmio_copy_type == KVMPPC_VSX_COPY_WORD)
			kvmppc_set_vsr_word(vcpu, gpr);
		else if (vcpu->arch.mmio_copy_type ==
				KVMPPC_VSX_COPY_DWORD_LOAD_DUMP)
			kvmppc_set_vsr_dword_dump(vcpu, gpr);
		else if (vcpu->arch.mmio_copy_type ==
				KVMPPC_VSX_COPY_WORD_LOAD_DUMP)
			kvmppc_set_vsr_word_dump(vcpu, gpr);
		break;
#endif
#ifdef CONFIG_ALTIVEC
	case KVM_MMIO_REG_VMX:
		if (vcpu->kvm->arch.kvm_ops->giveup_ext)
			vcpu->kvm->arch.kvm_ops->giveup_ext(vcpu, MSR_VEC);

		if (vcpu->arch.mmio_copy_type == KVMPPC_VMX_COPY_DWORD)
			kvmppc_set_vmx_dword(vcpu, gpr);
		else if (vcpu->arch.mmio_copy_type == KVMPPC_VMX_COPY_WORD)
			kvmppc_set_vmx_word(vcpu, gpr);
		else if (vcpu->arch.mmio_copy_type ==
				KVMPPC_VMX_COPY_HWORD)
			kvmppc_set_vmx_hword(vcpu, gpr);
		else if (vcpu->arch.mmio_copy_type ==
				KVMPPC_VMX_COPY_BYTE)
			kvmppc_set_vmx_byte(vcpu, gpr);
		break;
#endif
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
	case KVM_MMIO_REG_NESTED_GPR:
		if (kvmppc_need_byteswap(vcpu))
			gpr = swab64(gpr);
		kvm_vcpu_write_guest(vcpu, vcpu->arch.nested_io_gpr, &gpr,
				     sizeof(gpr));
		break;
#endif
	default:
		BUG();
	}
}