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Commit 388cf9ee authored by Alexander Graf's avatar Alexander Graf
Browse files

KVM: PPC: Move mtspr/mfspr emulation into own functions 



The mtspr/mfspr emulation code became quite big over time. Move it
into its own function so things stay more readable.

Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
parent 686de182

arch/powerpc/kvm/emulate.c

+121 −100
Original line number Diff line number Diff line
@@ -131,6 +131,125 @@ u32 kvmppc_get_dec(struct kvm_vcpu *vcpu, u64 tb) 
	return vcpu->arch.dec - jd;

}



static int kvmppc_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)

{

	enum emulation_result emulated = EMULATE_DONE;

	ulong spr_val = kvmppc_get_gpr(vcpu, rs);



	switch (sprn) {

	case SPRN_SRR0:

		vcpu->arch.shared->srr0 = spr_val;

		break;

	case SPRN_SRR1:

		vcpu->arch.shared->srr1 = spr_val;

		break;



	/* XXX We need to context-switch the timebase for

	 * watchdog and FIT. */

	case SPRN_TBWL: break;

	case SPRN_TBWU: break;



	case SPRN_MSSSR0: break;



	case SPRN_DEC:

		vcpu->arch.dec = spr_val;

		kvmppc_emulate_dec(vcpu);

		break;



	case SPRN_SPRG0:

		vcpu->arch.shared->sprg0 = spr_val;

		break;

	case SPRN_SPRG1:

		vcpu->arch.shared->sprg1 = spr_val;

		break;

	case SPRN_SPRG2:

		vcpu->arch.shared->sprg2 = spr_val;

		break;

	case SPRN_SPRG3:

		vcpu->arch.shared->sprg3 = spr_val;

		break;



	default:

		emulated = kvmppc_core_emulate_mtspr(vcpu, sprn,

						     spr_val);

		if (emulated == EMULATE_FAIL)

			printk(KERN_INFO "mtspr: unknown spr "

				"0x%x\n", sprn);

		break;

	}



	kvmppc_set_exit_type(vcpu, EMULATED_MTSPR_EXITS);



	return emulated;

}



static int kvmppc_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)

{

	enum emulation_result emulated = EMULATE_DONE;

	ulong spr_val = 0;



	switch (sprn) {

	case SPRN_SRR0:

		spr_val = vcpu->arch.shared->srr0;

		break;

	case SPRN_SRR1:

		spr_val = vcpu->arch.shared->srr1;

		break;

	case SPRN_PVR:

		spr_val = vcpu->arch.pvr;

		break;

	case SPRN_PIR:

		spr_val = vcpu->vcpu_id;

		break;

	case SPRN_MSSSR0:

		spr_val = 0;

		break;



	/* Note: mftb and TBRL/TBWL are user-accessible, so

	 * the guest can always access the real TB anyways.

	 * In fact, we probably will never see these traps. */

	case SPRN_TBWL:

		spr_val = get_tb() >> 32;

		break;

	case SPRN_TBWU:

		spr_val = get_tb();

		break;



	case SPRN_SPRG0:

		spr_val = vcpu->arch.shared->sprg0;

		break;

	case SPRN_SPRG1:

		spr_val = vcpu->arch.shared->sprg1;

		break;

	case SPRN_SPRG2:

		spr_val = vcpu->arch.shared->sprg2;

		break;

	case SPRN_SPRG3:

		spr_val = vcpu->arch.shared->sprg3;

		break;

	/* Note: SPRG4-7 are user-readable, so we don't get

	 * a trap. */



	case SPRN_DEC:

		spr_val = kvmppc_get_dec(vcpu, get_tb());

		break;

	default:

		emulated = kvmppc_core_emulate_mfspr(vcpu, sprn,

						     &spr_val);

		if (unlikely(emulated == EMULATE_FAIL)) {

			printk(KERN_INFO "mfspr: unknown spr "

				"0x%x\n", sprn);

		}

		break;

	}



	if (emulated == EMULATE_DONE)

		kvmppc_set_gpr(vcpu, rt, spr_val);

	kvmppc_set_exit_type(vcpu, EMULATED_MFSPR_EXITS);



	return emulated;

}



/* XXX to do:

 * lhax

 * lhaux
@@ -156,7 +275,6 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu) 
	int sprn = get_sprn(inst);

	enum emulation_result emulated = EMULATE_DONE;

	int advance = 1;

	ulong spr_val = 0;



	/* this default type might be overwritten by subcategories */

	kvmppc_set_exit_type(vcpu, EMULATED_INST_EXITS);
@@ -236,62 +354,7 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu) 
			break;



		case OP_31_XOP_MFSPR:

			switch (sprn) {

			case SPRN_SRR0:

				spr_val = vcpu->arch.shared->srr0;

				break;

			case SPRN_SRR1:

				spr_val = vcpu->arch.shared->srr1;

				break;

			case SPRN_PVR:

				spr_val = vcpu->arch.pvr;

				break;

			case SPRN_PIR:

				spr_val = vcpu->vcpu_id;

				break;

			case SPRN_MSSSR0:

				spr_val = 0;

				break;



			/* Note: mftb and TBRL/TBWL are user-accessible, so

			 * the guest can always access the real TB anyways.

			 * In fact, we probably will never see these traps. */

			case SPRN_TBWL:

				spr_val = get_tb() >> 32;

				break;

			case SPRN_TBWU:

				spr_val = get_tb();

				break;



			case SPRN_SPRG0:

				spr_val = vcpu->arch.shared->sprg0;

				break;

			case SPRN_SPRG1:

				spr_val = vcpu->arch.shared->sprg1;

				break;

			case SPRN_SPRG2:

				spr_val = vcpu->arch.shared->sprg2;

				break;

			case SPRN_SPRG3:

				spr_val = vcpu->arch.shared->sprg3;

				break;

			/* Note: SPRG4-7 are user-readable, so we don't get

			 * a trap. */



			case SPRN_DEC:

				spr_val = kvmppc_get_dec(vcpu, get_tb());

				break;

			default:

				emulated = kvmppc_core_emulate_mfspr(vcpu, sprn,

								     &spr_val);

				if (unlikely(emulated == EMULATE_FAIL)) {

					printk(KERN_INFO "mfspr: unknown spr "

						"0x%x\n", sprn);

				}

				break;

			}

			kvmppc_set_gpr(vcpu, rt, spr_val);

			kvmppc_set_exit_type(vcpu, EMULATED_MFSPR_EXITS);

			emulated = kvmppc_emulate_mfspr(vcpu, sprn, rt);

			break;



		case OP_31_XOP_STHX:
@@ -308,49 +371,7 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu) 
			break;



		case OP_31_XOP_MTSPR:

			spr_val = kvmppc_get_gpr(vcpu, rs);

			switch (sprn) {

			case SPRN_SRR0:

				vcpu->arch.shared->srr0 = spr_val;

				break;

			case SPRN_SRR1:

				vcpu->arch.shared->srr1 = spr_val;

				break;



			/* XXX We need to context-switch the timebase for

			 * watchdog and FIT. */

			case SPRN_TBWL: break;

			case SPRN_TBWU: break;



			case SPRN_MSSSR0: break;



			case SPRN_DEC:

				vcpu->arch.dec = spr_val;

				kvmppc_emulate_dec(vcpu);

				break;



			case SPRN_SPRG0:

				vcpu->arch.shared->sprg0 = spr_val;

				break;

			case SPRN_SPRG1:

				vcpu->arch.shared->sprg1 = spr_val;

				break;

			case SPRN_SPRG2:

				vcpu->arch.shared->sprg2 = spr_val;

				break;

			case SPRN_SPRG3:

				vcpu->arch.shared->sprg3 = spr_val;

				break;



			default:

				emulated = kvmppc_core_emulate_mtspr(vcpu, sprn,

								     spr_val);

				if (emulated == EMULATE_FAIL)

					printk(KERN_INFO "mtspr: unknown spr "

						"0x%x\n", sprn);

				break;

			}

			kvmppc_set_exit_type(vcpu, EMULATED_MTSPR_EXITS);

			emulated = kvmppc_emulate_mtspr(vcpu, sprn, rs);

			break;



		case OP_31_XOP_DCBI: