arch/powerpc/kvm/book3s_64_emulate.c - kernel/msm - Gitiles

 /*
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License, version 2, as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  *
  * Copyright SUSE Linux Products GmbH 2009
  *
  * Authors: Alexander Graf <agraf@suse.de>
  */

 #include <asm/kvm_ppc.h>
 #include <asm/disassemble.h>
 #include <asm/kvm_book3s.h>
 #include <asm/reg.h>

 #define OP_19_XOP_RFID		18
 #define OP_19_XOP_RFI		50

 #define OP_31_XOP_MFMSR		83
 #define OP_31_XOP_MTMSR		146
 #define OP_31_XOP_MTMSRD	178
 #define OP_31_XOP_MTSRIN	242
 #define OP_31_XOP_TLBIEL	274
 #define OP_31_XOP_TLBIE		306
 #define OP_31_XOP_SLBMTE	402
 #define OP_31_XOP_SLBIE		434
 #define OP_31_XOP_SLBIA		498
 #define OP_31_XOP_MFSRIN	659
 #define OP_31_XOP_SLBMFEV	851
 #define OP_31_XOP_EIOIO		854
 #define OP_31_XOP_SLBMFEE	915

 /* DCBZ is actually 1014, but we patch it to 1010 so we get a trap */
 #define OP_31_XOP_DCBZ		1010

 int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
                            unsigned int inst, int *advance)
 {
 	int emulated = EMULATE_DONE;

 	switch (get_op(inst)) {
 	case 19:
 		switch (get_xop(inst)) {
 		case OP_19_XOP_RFID:
 		case OP_19_XOP_RFI:
 			vcpu->arch.pc = vcpu->arch.srr0;
 			kvmppc_set_msr(vcpu, vcpu->arch.srr1);
 			*advance = 0;
 			break;

 		default:
 			emulated = EMULATE_FAIL;
 			break;
 		}
 		break;
 	case 31:
 		switch (get_xop(inst)) {
 		case OP_31_XOP_MFMSR:
 			vcpu->arch.gpr[get_rt(inst)] = vcpu->arch.msr;
 			break;
 		case OP_31_XOP_MTMSRD:
 		{
 			ulong rs = vcpu->arch.gpr[get_rs(inst)];
 			if (inst & 0x10000) {
 				vcpu->arch.msr &= ~(MSR_RI | MSR_EE);
 				vcpu->arch.msr |= rs & (MSR_RI | MSR_EE);
 			} else
 				kvmppc_set_msr(vcpu, rs);
 			break;
 		}
 		case OP_31_XOP_MTMSR:
 			kvmppc_set_msr(vcpu, vcpu->arch.gpr[get_rs(inst)]);
 			break;
 		case OP_31_XOP_MFSRIN:
 		{
 			int srnum;

 			srnum = (vcpu->arch.gpr[get_rb(inst)] >> 28) & 0xf;
 			if (vcpu->arch.mmu.mfsrin) {
 				u32 sr;
 				sr = vcpu->arch.mmu.mfsrin(vcpu, srnum);
 				vcpu->arch.gpr[get_rt(inst)] = sr;
 			}
 			break;
 		}
 		case OP_31_XOP_MTSRIN:
 			vcpu->arch.mmu.mtsrin(vcpu,
 				(vcpu->arch.gpr[get_rb(inst)] >> 28) & 0xf,
 				vcpu->arch.gpr[get_rs(inst)]);
 			break;
 		case OP_31_XOP_TLBIE:
 		case OP_31_XOP_TLBIEL:
 		{
 			bool large = (inst & 0x00200000) ? true : false;
 			ulong addr = vcpu->arch.gpr[get_rb(inst)];
 			vcpu->arch.mmu.tlbie(vcpu, addr, large);
 			break;
 		}
 		case OP_31_XOP_EIOIO:
 			break;
 		case OP_31_XOP_SLBMTE:
 			if (!vcpu->arch.mmu.slbmte)
 				return EMULATE_FAIL;

 			vcpu->arch.mmu.slbmte(vcpu, vcpu->arch.gpr[get_rs(inst)],
 						vcpu->arch.gpr[get_rb(inst)]);
 			break;
 		case OP_31_XOP_SLBIE:
 			if (!vcpu->arch.mmu.slbie)
 				return EMULATE_FAIL;

 			vcpu->arch.mmu.slbie(vcpu, vcpu->arch.gpr[get_rb(inst)]);
 			break;
 		case OP_31_XOP_SLBIA:
 			if (!vcpu->arch.mmu.slbia)
 				return EMULATE_FAIL;

 			vcpu->arch.mmu.slbia(vcpu);
 			break;
 		case OP_31_XOP_SLBMFEE:
 			if (!vcpu->arch.mmu.slbmfee) {
 				emulated = EMULATE_FAIL;
 			} else {
 				ulong t, rb;

 				rb = vcpu->arch.gpr[get_rb(inst)];
 				t = vcpu->arch.mmu.slbmfee(vcpu, rb);
 				vcpu->arch.gpr[get_rt(inst)] = t;
 			}
 			break;
 		case OP_31_XOP_SLBMFEV:
 			if (!vcpu->arch.mmu.slbmfev) {
 				emulated = EMULATE_FAIL;
 			} else {
 				ulong t, rb;

 				rb = vcpu->arch.gpr[get_rb(inst)];
 				t = vcpu->arch.mmu.slbmfev(vcpu, rb);
 				vcpu->arch.gpr[get_rt(inst)] = t;
 			}
 			break;
 		case OP_31_XOP_DCBZ:
 		{
 			ulong rb =  vcpu->arch.gpr[get_rb(inst)];
 			ulong ra = 0;
 			ulong addr;
 			u32 zeros[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };

 			if (get_ra(inst))
 				ra = vcpu->arch.gpr[get_ra(inst)];

 			addr = (ra + rb) & ~31ULL;
 			if (!(vcpu->arch.msr & MSR_SF))
 				addr &= 0xffffffff;

 			if (kvmppc_st(vcpu, addr, 32, zeros)) {
 				vcpu->arch.dear = addr;
 				vcpu->arch.fault_dear = addr;
 				to_book3s(vcpu)->dsisr = DSISR_PROTFAULT |
 						      DSISR_ISSTORE;
 				kvmppc_book3s_queue_irqprio(vcpu,
 					BOOK3S_INTERRUPT_DATA_STORAGE);
 				kvmppc_mmu_pte_flush(vcpu, addr, ~0xFFFULL);
 			}

 			break;
 		}
 		default:
 			emulated = EMULATE_FAIL;
 		}
 		break;
 	default:
 		emulated = EMULATE_FAIL;
 	}

 	return emulated;
 }

 static void kvmppc_write_bat(struct kvm_vcpu *vcpu, int sprn, u64 val)
 {
 	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
 	struct kvmppc_bat *bat;

 	switch (sprn) {
 	case SPRN_IBAT0U ... SPRN_IBAT3L:
 		bat = &vcpu_book3s->ibat[(sprn - SPRN_IBAT0U) / 2];
 		break;
 	case SPRN_IBAT4U ... SPRN_IBAT7L:
 		bat = &vcpu_book3s->ibat[(sprn - SPRN_IBAT4U) / 2];
 		break;
 	case SPRN_DBAT0U ... SPRN_DBAT3L:
 		bat = &vcpu_book3s->dbat[(sprn - SPRN_DBAT0U) / 2];
 		break;
 	case SPRN_DBAT4U ... SPRN_DBAT7L:
 		bat = &vcpu_book3s->dbat[(sprn - SPRN_DBAT4U) / 2];
 		break;
 	default:
 		BUG();
 	}

 	if (!(sprn % 2)) {
 		/* Upper BAT */
 		u32 bl = (val >> 2) & 0x7ff;
 		bat->bepi_mask = (~bl << 17);
 		bat->bepi = val & 0xfffe0000;
 		bat->vs = (val & 2) ? 1 : 0;
 		bat->vp = (val & 1) ? 1 : 0;
 	} else {
 		/* Lower BAT */
 		bat->brpn = val & 0xfffe0000;
 		bat->wimg = (val >> 3) & 0xf;
 		bat->pp = val & 3;
 	}
 }

 int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
 {
 	int emulated = EMULATE_DONE;

 	switch (sprn) {
 	case SPRN_SDR1:
 		to_book3s(vcpu)->sdr1 = vcpu->arch.gpr[rs];
 		break;
 	case SPRN_DSISR:
 		to_book3s(vcpu)->dsisr = vcpu->arch.gpr[rs];
 		break;
 	case SPRN_DAR:
 		vcpu->arch.dear = vcpu->arch.gpr[rs];
 		break;
 	case SPRN_HIOR:
 		to_book3s(vcpu)->hior = vcpu->arch.gpr[rs];
 		break;
 	case SPRN_IBAT0U ... SPRN_IBAT3L:
 	case SPRN_IBAT4U ... SPRN_IBAT7L:
 	case SPRN_DBAT0U ... SPRN_DBAT3L:
 	case SPRN_DBAT4U ... SPRN_DBAT7L:
 		kvmppc_write_bat(vcpu, sprn, vcpu->arch.gpr[rs]);
 		/* BAT writes happen so rarely that we're ok to flush
 		 * everything here */
 		kvmppc_mmu_pte_flush(vcpu, 0, 0);
 		break;
 	case SPRN_HID0:
 		to_book3s(vcpu)->hid[0] = vcpu->arch.gpr[rs];
 		break;
 	case SPRN_HID1:
 		to_book3s(vcpu)->hid[1] = vcpu->arch.gpr[rs];
 		break;
 	case SPRN_HID2:
 		to_book3s(vcpu)->hid[2] = vcpu->arch.gpr[rs];
 		break;
 	case SPRN_HID4:
 		to_book3s(vcpu)->hid[4] = vcpu->arch.gpr[rs];
 		break;
 	case SPRN_HID5:
 		to_book3s(vcpu)->hid[5] = vcpu->arch.gpr[rs];
 		/* guest HID5 set can change is_dcbz32 */
 		if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 		    (mfmsr() & MSR_HV))
 			vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 		break;
 	case SPRN_ICTC:
 	case SPRN_THRM1:
 	case SPRN_THRM2:
 	case SPRN_THRM3:
 	case SPRN_CTRLF:
 	case SPRN_CTRLT:
 		break;
 	default:
 		printk(KERN_INFO "KVM: invalid SPR write: %d\n", sprn);
 #ifndef DEBUG_SPR
 		emulated = EMULATE_FAIL;
 #endif
 		break;
 	}

 	return emulated;
 }

 int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
 {
 	int emulated = EMULATE_DONE;

 	switch (sprn) {
 	case SPRN_SDR1:
 		vcpu->arch.gpr[rt] = to_book3s(vcpu)->sdr1;
 		break;
 	case SPRN_DSISR:
 		vcpu->arch.gpr[rt] = to_book3s(vcpu)->dsisr;
 		break;
 	case SPRN_DAR:
 		vcpu->arch.gpr[rt] = vcpu->arch.dear;
 		break;
 	case SPRN_HIOR:
 		vcpu->arch.gpr[rt] = to_book3s(vcpu)->hior;
 		break;
 	case SPRN_HID0:
 		vcpu->arch.gpr[rt] = to_book3s(vcpu)->hid[0];
 		break;
 	case SPRN_HID1:
 		vcpu->arch.gpr[rt] = to_book3s(vcpu)->hid[1];
 		break;
 	case SPRN_HID2:
 		vcpu->arch.gpr[rt] = to_book3s(vcpu)->hid[2];
 		break;
 	case SPRN_HID4:
 		vcpu->arch.gpr[rt] = to_book3s(vcpu)->hid[4];
 		break;
 	case SPRN_HID5:
 		vcpu->arch.gpr[rt] = to_book3s(vcpu)->hid[5];
 		break;
 	case SPRN_THRM1:
 	case SPRN_THRM2:
 	case SPRN_THRM3:
 	case SPRN_CTRLF:
 	case SPRN_CTRLT:
 		vcpu->arch.gpr[rt] = 0;
 		break;
 	default:
 		printk(KERN_INFO "KVM: invalid SPR read: %d\n", sprn);
 #ifndef DEBUG_SPR
 		emulated = EMULATE_FAIL;
 #endif
 		break;
 	}

 	return emulated;
 }
	/*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License, version 2, as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	*
	* Copyright SUSE Linux Products GmbH 2009
	*
	* Authors: Alexander Graf <agraf@suse.de>
	*/

	#include <asm/kvm_ppc.h>
	#include <asm/disassemble.h>
	#include <asm/kvm_book3s.h>
	#include <asm/reg.h>

	#define OP_19_XOP_RFID 18
	#define OP_19_XOP_RFI 50

	#define OP_31_XOP_MFMSR 83
	#define OP_31_XOP_MTMSR 146
	#define OP_31_XOP_MTMSRD 178
	#define OP_31_XOP_MTSRIN 242
	#define OP_31_XOP_TLBIEL 274
	#define OP_31_XOP_TLBIE 306
	#define OP_31_XOP_SLBMTE 402
	#define OP_31_XOP_SLBIE 434
	#define OP_31_XOP_SLBIA 498
	#define OP_31_XOP_MFSRIN 659
	#define OP_31_XOP_SLBMFEV 851
	#define OP_31_XOP_EIOIO 854
	#define OP_31_XOP_SLBMFEE 915

	/* DCBZ is actually 1014, but we patch it to 1010 so we get a trap */
	#define OP_31_XOP_DCBZ 1010

	int kvmppc_core_emulate_op(struct kvm_run run, struct kvm_vcpu vcpu,
	unsigned int inst, int *advance)
	{
	int emulated = EMULATE_DONE;

	switch (get_op(inst)) {
	case 19:
	switch (get_xop(inst)) {
	case OP_19_XOP_RFID:
	case OP_19_XOP_RFI:
	vcpu->arch.pc = vcpu->arch.srr0;
	kvmppc_set_msr(vcpu, vcpu->arch.srr1);
	*advance = 0;
	break;

	default:
	emulated = EMULATE_FAIL;
	break;
	}
	break;
	case 31:
	switch (get_xop(inst)) {
	case OP_31_XOP_MFMSR:
	vcpu->arch.gpr[get_rt(inst)] = vcpu->arch.msr;
	break;
	case OP_31_XOP_MTMSRD:
	{
	ulong rs = vcpu->arch.gpr[get_rs(inst)];
	if (inst & 0x10000) {
	vcpu->arch.msr &= ~(MSR_RI \| MSR_EE);
	vcpu->arch.msr \|= rs & (MSR_RI \| MSR_EE);
	} else
	kvmppc_set_msr(vcpu, rs);
	break;
	}
	case OP_31_XOP_MTMSR:
	kvmppc_set_msr(vcpu, vcpu->arch.gpr[get_rs(inst)]);
	break;
	case OP_31_XOP_MFSRIN:
	{
	int srnum;

	srnum = (vcpu->arch.gpr[get_rb(inst)] >> 28) & 0xf;
	if (vcpu->arch.mmu.mfsrin) {
	u32 sr;
	sr = vcpu->arch.mmu.mfsrin(vcpu, srnum);
	vcpu->arch.gpr[get_rt(inst)] = sr;
	}
	break;
	}
	case OP_31_XOP_MTSRIN:
	vcpu->arch.mmu.mtsrin(vcpu,
	(vcpu->arch.gpr[get_rb(inst)] >> 28) & 0xf,
	vcpu->arch.gpr[get_rs(inst)]);
	break;
	case OP_31_XOP_TLBIE:
	case OP_31_XOP_TLBIEL:
	{
	bool large = (inst & 0x00200000) ? true : false;
	ulong addr = vcpu->arch.gpr[get_rb(inst)];
	vcpu->arch.mmu.tlbie(vcpu, addr, large);
	break;
	}
	case OP_31_XOP_EIOIO:
	break;
	case OP_31_XOP_SLBMTE:
	if (!vcpu->arch.mmu.slbmte)
	return EMULATE_FAIL;

	vcpu->arch.mmu.slbmte(vcpu, vcpu->arch.gpr[get_rs(inst)],
	vcpu->arch.gpr[get_rb(inst)]);
	break;
	case OP_31_XOP_SLBIE:
	if (!vcpu->arch.mmu.slbie)
	return EMULATE_FAIL;

	vcpu->arch.mmu.slbie(vcpu, vcpu->arch.gpr[get_rb(inst)]);
	break;
	case OP_31_XOP_SLBIA:
	if (!vcpu->arch.mmu.slbia)
	return EMULATE_FAIL;

	vcpu->arch.mmu.slbia(vcpu);
	break;
	case OP_31_XOP_SLBMFEE:
	if (!vcpu->arch.mmu.slbmfee) {
	emulated = EMULATE_FAIL;
	} else {
	ulong t, rb;

	rb = vcpu->arch.gpr[get_rb(inst)];
	t = vcpu->arch.mmu.slbmfee(vcpu, rb);
	vcpu->arch.gpr[get_rt(inst)] = t;
	}
	break;
	case OP_31_XOP_SLBMFEV:
	if (!vcpu->arch.mmu.slbmfev) {
	emulated = EMULATE_FAIL;
	} else {
	ulong t, rb;

	rb = vcpu->arch.gpr[get_rb(inst)];
	t = vcpu->arch.mmu.slbmfev(vcpu, rb);
	vcpu->arch.gpr[get_rt(inst)] = t;
	}
	break;
	case OP_31_XOP_DCBZ:
	{
	ulong rb = vcpu->arch.gpr[get_rb(inst)];
	ulong ra = 0;
	ulong addr;
	u32 zeros[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };

	if (get_ra(inst))
	ra = vcpu->arch.gpr[get_ra(inst)];

	addr = (ra + rb) & ~31ULL;
	if (!(vcpu->arch.msr & MSR_SF))
	addr &= 0xffffffff;

	if (kvmppc_st(vcpu, addr, 32, zeros)) {
	vcpu->arch.dear = addr;
	vcpu->arch.fault_dear = addr;
	to_book3s(vcpu)->dsisr = DSISR_PROTFAULT \|
	DSISR_ISSTORE;
	kvmppc_book3s_queue_irqprio(vcpu,
	BOOK3S_INTERRUPT_DATA_STORAGE);
	kvmppc_mmu_pte_flush(vcpu, addr, ~0xFFFULL);
	}

	break;
	}
	default:
	emulated = EMULATE_FAIL;
	}
	break;
	default:
	emulated = EMULATE_FAIL;
	}

	return emulated;
	}

	static void kvmppc_write_bat(struct kvm_vcpu *vcpu, int sprn, u64 val)
	{
	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
	struct kvmppc_bat *bat;

	switch (sprn) {
	case SPRN_IBAT0U ... SPRN_IBAT3L:
	bat = &vcpu_book3s->ibat[(sprn - SPRN_IBAT0U) / 2];
	break;
	case SPRN_IBAT4U ... SPRN_IBAT7L:
	bat = &vcpu_book3s->ibat[(sprn - SPRN_IBAT4U) / 2];
	break;
	case SPRN_DBAT0U ... SPRN_DBAT3L:
	bat = &vcpu_book3s->dbat[(sprn - SPRN_DBAT0U) / 2];
	break;
	case SPRN_DBAT4U ... SPRN_DBAT7L:
	bat = &vcpu_book3s->dbat[(sprn - SPRN_DBAT4U) / 2];
	break;
	default:
	BUG();
	}

	if (!(sprn % 2)) {
	/* Upper BAT */
	u32 bl = (val >> 2) & 0x7ff;
	bat->bepi_mask = (~bl << 17);
	bat->bepi = val & 0xfffe0000;
	bat->vs = (val & 2) ? 1 : 0;
	bat->vp = (val & 1) ? 1 : 0;
	} else {
	/* Lower BAT */
	bat->brpn = val & 0xfffe0000;
	bat->wimg = (val >> 3) & 0xf;
	bat->pp = val & 3;
	}
	}

	int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
	{
	int emulated = EMULATE_DONE;

	switch (sprn) {
	case SPRN_SDR1:
	to_book3s(vcpu)->sdr1 = vcpu->arch.gpr[rs];
	break;
	case SPRN_DSISR:
	to_book3s(vcpu)->dsisr = vcpu->arch.gpr[rs];
	break;
	case SPRN_DAR:
	vcpu->arch.dear = vcpu->arch.gpr[rs];
	break;
	case SPRN_HIOR:
	to_book3s(vcpu)->hior = vcpu->arch.gpr[rs];
	break;
	case SPRN_IBAT0U ... SPRN_IBAT3L:
	case SPRN_IBAT4U ... SPRN_IBAT7L:
	case SPRN_DBAT0U ... SPRN_DBAT3L:
	case SPRN_DBAT4U ... SPRN_DBAT7L:
	kvmppc_write_bat(vcpu, sprn, vcpu->arch.gpr[rs]);
	/* BAT writes happen so rarely that we're ok to flush
	* everything here */
	kvmppc_mmu_pte_flush(vcpu, 0, 0);
	break;
	case SPRN_HID0:
	to_book3s(vcpu)->hid[0] = vcpu->arch.gpr[rs];
	break;
	case SPRN_HID1:
	to_book3s(vcpu)->hid[1] = vcpu->arch.gpr[rs];
	break;
	case SPRN_HID2:
	to_book3s(vcpu)->hid[2] = vcpu->arch.gpr[rs];
	break;
	case SPRN_HID4:
	to_book3s(vcpu)->hid[4] = vcpu->arch.gpr[rs];
	break;
	case SPRN_HID5:
	to_book3s(vcpu)->hid[5] = vcpu->arch.gpr[rs];
	/* guest HID5 set can change is_dcbz32 */
	if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
	(mfmsr() & MSR_HV))
	vcpu->arch.hflags \|= BOOK3S_HFLAG_DCBZ32;
	break;
	case SPRN_ICTC:
	case SPRN_THRM1:
	case SPRN_THRM2:
	case SPRN_THRM3:
	case SPRN_CTRLF:
	case SPRN_CTRLT:
	break;
	default:
	printk(KERN_INFO "KVM: invalid SPR write: %d\n", sprn);
	#ifndef DEBUG_SPR
	emulated = EMULATE_FAIL;
	#endif
	break;
	}

	return emulated;
	}

	int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
	{
	int emulated = EMULATE_DONE;

	switch (sprn) {
	case SPRN_SDR1:
	vcpu->arch.gpr[rt] = to_book3s(vcpu)->sdr1;
	break;
	case SPRN_DSISR:
	vcpu->arch.gpr[rt] = to_book3s(vcpu)->dsisr;
	break;
	case SPRN_DAR:
	vcpu->arch.gpr[rt] = vcpu->arch.dear;
	break;
	case SPRN_HIOR:
	vcpu->arch.gpr[rt] = to_book3s(vcpu)->hior;
	break;
	case SPRN_HID0:
	vcpu->arch.gpr[rt] = to_book3s(vcpu)->hid[0];
	break;
	case SPRN_HID1:
	vcpu->arch.gpr[rt] = to_book3s(vcpu)->hid[1];
	break;
	case SPRN_HID2:
	vcpu->arch.gpr[rt] = to_book3s(vcpu)->hid[2];
	break;
	case SPRN_HID4:
	vcpu->arch.gpr[rt] = to_book3s(vcpu)->hid[4];
	break;
	case SPRN_HID5:
	vcpu->arch.gpr[rt] = to_book3s(vcpu)->hid[5];
	break;
	case SPRN_THRM1:
	case SPRN_THRM2:
	case SPRN_THRM3:
	case SPRN_CTRLF:
	case SPRN_CTRLT:
	vcpu->arch.gpr[rt] = 0;
	break;
	default:
	printk(KERN_INFO "KVM: invalid SPR read: %d\n", sprn);
	#ifndef DEBUG_SPR
	emulated = EMULATE_FAIL;
	#endif
	break;
	}

	return emulated;
	}