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// SPDX-License-Identifier: GPL-2.0-only
/*
*
* 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_19_XOP_RFCI 51
#define OP_19_XOP_RFDI 39
#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.regs.nip = vcpu->arch.shared->srr0;
kvmppc_set_msr(vcpu, vcpu->arch.shared->srr1);
}
static void kvmppc_emul_rfdi(struct kvm_vcpu *vcpu)
{
vcpu->arch.regs.nip = vcpu->arch.dsrr0;
kvmppc_set_msr(vcpu, vcpu->arch.dsrr1);
}
static void kvmppc_emul_rfci(struct kvm_vcpu *vcpu)
{
vcpu->arch.regs.nip = vcpu->arch.csrr0;
kvmppc_set_msr(vcpu, vcpu->arch.csrr1);
}
int kvmppc_booke_emulate_op(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;
case OP_19_XOP_RFCI:
kvmppc_emul_rfci(vcpu);
kvmppc_set_exit_type(vcpu, EMULATED_RFCI_EXITS);
*advance = 0;
break;
case OP_19_XOP_RFDI:
kvmppc_emul_rfdi(vcpu);
kvmppc_set_exit_type(vcpu, EMULATED_RFDI_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;
bool debug_inst = false;
switch (sprn) {
case SPRN_DEAR:
vcpu->arch.shared->dar = spr_val;
break;
case SPRN_ESR:
vcpu->arch.shared->esr = spr_val;
break;
case SPRN_CSRR0:
vcpu->arch.csrr0 = spr_val;
break;
case SPRN_CSRR1:
vcpu->arch.csrr1 = spr_val;
break;
case SPRN_DSRR0:
vcpu->arch.dsrr0 = spr_val;
break;
case SPRN_DSRR1:
vcpu->arch.dsrr1 = spr_val;
break;
case SPRN_IAC1:
/*
* If userspace is debugging guest then guest
* can not access debug registers.
*/
if (vcpu->guest_debug)
break;
debug_inst = true;
vcpu->arch.dbg_reg.iac1 = spr_val;
break;
case SPRN_IAC2:
/*
* If userspace is debugging guest then guest
* can not access debug registers.
*/
if (vcpu->guest_debug)
break;
debug_inst = true;
vcpu->arch.dbg_reg.iac2 = spr_val;
break;
#if CONFIG_PPC_ADV_DEBUG_IACS > 2
case SPRN_IAC3:
/*
* If userspace is debugging guest then guest
* can not access debug registers.
*/
if (vcpu->guest_debug)
break;
debug_inst = true;
vcpu->arch.dbg_reg.iac3 = spr_val;
break;
case SPRN_IAC4:
/*
* If userspace is debugging guest then guest
* can not access debug registers.
*/
if (vcpu->guest_debug)
break;
debug_inst = true;
vcpu->arch.dbg_reg.iac4 = spr_val;
break;
#endif
case SPRN_DAC1:
/*
* If userspace is debugging guest then guest
* can not access debug registers.
*/
if (vcpu->guest_debug)
break;
debug_inst = true;
vcpu->arch.dbg_reg.dac1 = spr_val;
break;
case SPRN_DAC2:
/*
* If userspace is debugging guest then guest
* can not access debug registers.
*/
if (vcpu->guest_debug)
break;
debug_inst = true;
vcpu->arch.dbg_reg.dac2 = spr_val;
break;
case SPRN_DBCR0:
/*
* If userspace is debugging guest then guest
* can not access debug registers.
*/
if (vcpu->guest_debug)
break;
debug_inst = true;
spr_val &= (DBCR0_IDM | DBCR0_IC | DBCR0_BT | DBCR0_TIE |
DBCR0_IAC1 | DBCR0_IAC2 | DBCR0_IAC3 | DBCR0_IAC4 |
DBCR0_DAC1R | DBCR0_DAC1W | DBCR0_DAC2R | DBCR0_DAC2W);
vcpu->arch.dbg_reg.dbcr0 = spr_val;
break;
case SPRN_DBCR1:
/*
* If userspace is debugging guest then guest
* can not access debug registers.
*/
if (vcpu->guest_debug)
break;
debug_inst = true;
vcpu->arch.dbg_reg.dbcr1 = spr_val;
break;
case SPRN_DBCR2:
/*
* If userspace is debugging guest then guest
* can not access debug registers.
*/
if (vcpu->guest_debug)
break;
debug_inst = true;
vcpu->arch.dbg_reg.dbcr2 = spr_val;
break;
case SPRN_DBSR:
/*
* If userspace is debugging guest then guest
* can not access debug registers.
*/
if (vcpu->guest_debug)
break;
vcpu->arch.dbsr &= ~spr_val;
if (!(vcpu->arch.dbsr & ~DBSR_IDE))
kvmppc_core_dequeue_debug(vcpu);
break;
case SPRN_TSR:
kvmppc_clr_tsr_bits(vcpu, spr_val);
break;
case SPRN_TCR:
/*
* WRC is a 2-bit field that is supposed to preserve its
* value once written to non-zero.
*/
if (vcpu->arch.tcr & TCR_WRC_MASK) {
spr_val &= ~TCR_WRC_MASK;
spr_val |= vcpu->arch.tcr & TCR_WRC_MASK;
}
kvmppc_set_tcr(vcpu, spr_val);
break;
case SPRN_DECAR:
vcpu->arch.decar = 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:
kvmppc_set_sprg4(vcpu, spr_val);
break;
case SPRN_SPRG5:
kvmppc_set_sprg5(vcpu, spr_val);
break;
case SPRN_SPRG6:
kvmppc_set_sprg6(vcpu, spr_val);
break;
case SPRN_SPRG7:
kvmppc_set_sprg7(vcpu, spr_val);
|