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linux/arch/powerpc/kvm/booke_emulate.c
Alexander Graf 54771e6217 KVM: PPC: Emulator: clean up SPR reads and writes 
When reading and writing SPRs, every SPR emulation piece had to read
or write the respective GPR the value was read from or stored in itself.

This approach is pretty prone to failure. What if we accidentally
implement mfspr emulation where we just do "break" and nothing else?
Suddenly we would get a random value in the return register - which is
always a bad idea.

So let's consolidate the generic code paths and only give the core
specific SPR handling code readily made variables to read/write from/to.

Functionally, this patch doesn't change anything, but it increases the
readability of the code and makes is less prone to bugs.

Signed-off-by: Alexander Graf <agraf@suse.de>
2012-05-06 16:19:13 +02:00

303 lines
7.0 KiB
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/*
* 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 IBM Corp. 2008
* Copyright 2011 Freescale Semiconductor, Inc.
*
* Authors: Hollis Blanchard <hollisb@us.ibm.com>
*/
#include <linux/kvm_host.h>
#include <asm/disassemble.h>
#include "booke.h"
#define OP_19_XOP_RFI 50
#define OP_31_XOP_MFMSR 83
#define OP_31_XOP_WRTEE 131
#define OP_31_XOP_MTMSR 146
#define OP_31_XOP_WRTEEI 163
static void kvmppc_emul_rfi(struct kvm_vcpu *vcpu)
{
vcpu->arch.pc = vcpu->arch.shared->srr0;
kvmppc_set_msr(vcpu, vcpu->arch.shared->srr1);
}
int kvmppc_booke_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int inst, int *advance)
{
int emulated = EMULATE_DONE;
int rs = get_rs(inst);
int rt = get_rt(inst);
switch (get_op(inst)) {
case 19:
switch (get_xop(inst)) {
case OP_19_XOP_RFI:
kvmppc_emul_rfi(vcpu);
kvmppc_set_exit_type(vcpu, EMULATED_RFI_EXITS);
*advance = 0;
break;
default:
emulated = EMULATE_FAIL;
break;
}
break;
case 31:
switch (get_xop(inst)) {
case OP_31_XOP_MFMSR:
kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->msr);
kvmppc_set_exit_type(vcpu, EMULATED_MFMSR_EXITS);
break;
case OP_31_XOP_MTMSR:
kvmppc_set_exit_type(vcpu, EMULATED_MTMSR_EXITS);
kvmppc_set_msr(vcpu, kvmppc_get_gpr(vcpu, rs));
break;
case OP_31_XOP_WRTEE:
vcpu->arch.shared->msr = (vcpu->arch.shared->msr & ~MSR_EE)
| (kvmppc_get_gpr(vcpu, rs) & MSR_EE);
kvmppc_set_exit_type(vcpu, EMULATED_WRTEE_EXITS);
break;
case OP_31_XOP_WRTEEI:
vcpu->arch.shared->msr = (vcpu->arch.shared->msr & ~MSR_EE)
| (inst & MSR_EE);
kvmppc_set_exit_type(vcpu, EMULATED_WRTEE_EXITS);
break;
default:
emulated = EMULATE_FAIL;
}
break;
default:
emulated = EMULATE_FAIL;
}
return emulated;
}
/*
* NOTE: some of these registers are not emulated on BOOKE_HV (GS-mode).
* Their backing store is in real registers, and these functions
* will return the wrong result if called for them in another context
* (such as debugging).
*/
int kvmppc_booke_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val)
{
int emulated = EMULATE_DONE;
switch (sprn) {
case SPRN_DEAR:
vcpu->arch.shared->dar = spr_val;
break;
case SPRN_ESR:
vcpu->arch.shared->esr = spr_val;
break;
case SPRN_DBCR0:
vcpu->arch.dbcr0 = spr_val;
break;
case SPRN_DBCR1:
vcpu->arch.dbcr1 = spr_val;
break;
case SPRN_DBSR:
vcpu->arch.dbsr &= ~spr_val;
break;
case SPRN_TSR:
kvmppc_clr_tsr_bits(vcpu, spr_val);
break;
case SPRN_TCR:
kvmppc_set_tcr(vcpu, spr_val);
break;
/*
* Note: SPRG4-7 are user-readable.
* These values are loaded into the real SPRGs when resuming the
* guest (PR-mode only).
*/
case SPRN_SPRG4:
vcpu->arch.shared->sprg4 = spr_val;
break;
case SPRN_SPRG5:
vcpu->arch.shared->sprg5 = spr_val;
break;
case SPRN_SPRG6:
vcpu->arch.shared->sprg6 = spr_val;
break;
case SPRN_SPRG7:
vcpu->arch.shared->sprg7 = spr_val;
break;
case SPRN_IVPR:
vcpu->arch.ivpr = spr_val;
#ifdef CONFIG_KVM_BOOKE_HV
mtspr(SPRN_GIVPR, spr_val);
#endif
break;
case SPRN_IVOR0:
vcpu->arch.ivor[BOOKE_IRQPRIO_CRITICAL] = spr_val;
break;
case SPRN_IVOR1:
vcpu->arch.ivor[BOOKE_IRQPRIO_MACHINE_CHECK] = spr_val;
break;
case SPRN_IVOR2:
vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE] = spr_val;
#ifdef CONFIG_KVM_BOOKE_HV
mtspr(SPRN_GIVOR2, spr_val);
#endif
break;
case SPRN_IVOR3:
vcpu->arch.ivor[BOOKE_IRQPRIO_INST_STORAGE] = spr_val;
break;
case SPRN_IVOR4:
vcpu->arch.ivor[BOOKE_IRQPRIO_EXTERNAL] = spr_val;
break;
case SPRN_IVOR5:
vcpu->arch.ivor[BOOKE_IRQPRIO_ALIGNMENT] = spr_val;
break;
case SPRN_IVOR6:
vcpu->arch.ivor[BOOKE_IRQPRIO_PROGRAM] = spr_val;
break;
case SPRN_IVOR7:
vcpu->arch.ivor[BOOKE_IRQPRIO_FP_UNAVAIL] = spr_val;
break;
case SPRN_IVOR8:
vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL] = spr_val;
#ifdef CONFIG_KVM_BOOKE_HV
mtspr(SPRN_GIVOR8, spr_val);
#endif
break;
case SPRN_IVOR9:
vcpu->arch.ivor[BOOKE_IRQPRIO_AP_UNAVAIL] = spr_val;
break;
case SPRN_IVOR10:
vcpu->arch.ivor[BOOKE_IRQPRIO_DECREMENTER] = spr_val;
break;
case SPRN_IVOR11:
vcpu->arch.ivor[BOOKE_IRQPRIO_FIT] = spr_val;
break;
case SPRN_IVOR12:
vcpu->arch.ivor[BOOKE_IRQPRIO_WATCHDOG] = spr_val;
break;
case SPRN_IVOR13:
vcpu->arch.ivor[BOOKE_IRQPRIO_DTLB_MISS] = spr_val;
break;
case SPRN_IVOR14:
vcpu->arch.ivor[BOOKE_IRQPRIO_ITLB_MISS] = spr_val;
break;
case SPRN_IVOR15:
vcpu->arch.ivor[BOOKE_IRQPRIO_DEBUG] = spr_val;
break;
default:
emulated = EMULATE_FAIL;
}
return emulated;
}
int kvmppc_booke_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val)
{
int emulated = EMULATE_DONE;
switch (sprn) {
case SPRN_IVPR:
*spr_val = vcpu->arch.ivpr;
break;
case SPRN_DEAR:
*spr_val = vcpu->arch.shared->dar;
break;
case SPRN_ESR:
*spr_val = vcpu->arch.shared->esr;
break;
case SPRN_DBCR0:
*spr_val = vcpu->arch.dbcr0;
break;
case SPRN_DBCR1:
*spr_val = vcpu->arch.dbcr1;
break;
case SPRN_DBSR:
*spr_val = vcpu->arch.dbsr;
break;
case SPRN_TSR:
*spr_val = vcpu->arch.tsr;
break;
case SPRN_TCR:
*spr_val = vcpu->arch.tcr;
break;
case SPRN_IVOR0:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_CRITICAL];
break;
case SPRN_IVOR1:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_MACHINE_CHECK];
break;
case SPRN_IVOR2:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE];
break;
case SPRN_IVOR3:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_INST_STORAGE];
break;
case SPRN_IVOR4:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_EXTERNAL];
break;
case SPRN_IVOR5:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_ALIGNMENT];
break;
case SPRN_IVOR6:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_PROGRAM];
break;
case SPRN_IVOR7:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_FP_UNAVAIL];
break;
case SPRN_IVOR8:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL];
break;
case SPRN_IVOR9:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_AP_UNAVAIL];
break;
case SPRN_IVOR10:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_DECREMENTER];
break;
case SPRN_IVOR11:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_FIT];
break;
case SPRN_IVOR12:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_WATCHDOG];
break;
case SPRN_IVOR13:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_DTLB_MISS];
break;
case SPRN_IVOR14:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_ITLB_MISS];
break;
case SPRN_IVOR15:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_DEBUG];
break;
default:
emulated = EMULATE_FAIL;
}
return emulated;
}
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