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linux-next/arch/powerpc/kvm/e500_emulate.c
Diana Craciun 98518c4d87 powerpc/fsl: Emulate SPRN_BUCSR register 
In order to flush the branch predictor the guest kernel performs
writes to the BUCSR register which is hypervisor privilleged. However,
the branch predictor is flushed at each KVM entry, so the branch
predictor has been already flushed, so just return as soon as possible
to guest.

Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
[mpe: Tweak comment formatting]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-12-20 22:59:03 +11:00

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/*
* Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All rights reserved.
*
* Author: Yu Liu, <yu.liu@freescale.com>
*
* Description:
* This file is derived from arch/powerpc/kvm/44x_emulate.c,
* by Hollis Blanchard <hollisb@us.ibm.com>.
*
* 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.
*/
#include <asm/kvm_ppc.h>
#include <asm/disassemble.h>
#include <asm/dbell.h>
#include <asm/reg_booke.h>
#include "booke.h"
#include "e500.h"
#define XOP_DCBTLS 166
#define XOP_MSGSND 206
#define XOP_MSGCLR 238
#define XOP_MFTMR 366
#define XOP_TLBIVAX 786
#define XOP_TLBSX 914
#define XOP_TLBRE 946
#define XOP_TLBWE 978
#define XOP_TLBILX 18
#define XOP_EHPRIV 270
#ifdef CONFIG_KVM_E500MC
static int dbell2prio(ulong param)
{
int msg = param & PPC_DBELL_TYPE_MASK;
int prio = -1;
switch (msg) {
case PPC_DBELL_TYPE(PPC_DBELL):
prio = BOOKE_IRQPRIO_DBELL;
break;
case PPC_DBELL_TYPE(PPC_DBELL_CRIT):
prio = BOOKE_IRQPRIO_DBELL_CRIT;
break;
default:
break;
}
return prio;
}
static int kvmppc_e500_emul_msgclr(struct kvm_vcpu *vcpu, int rb)
{
ulong param = vcpu->arch.regs.gpr[rb];
int prio = dbell2prio(param);
if (prio < 0)
return EMULATE_FAIL;
clear_bit(prio, &vcpu->arch.pending_exceptions);
return EMULATE_DONE;
}
static int kvmppc_e500_emul_msgsnd(struct kvm_vcpu *vcpu, int rb)
{
ulong param = vcpu->arch.regs.gpr[rb];
int prio = dbell2prio(rb);
int pir = param & PPC_DBELL_PIR_MASK;
int i;
struct kvm_vcpu *cvcpu;
if (prio < 0)
return EMULATE_FAIL;
kvm_for_each_vcpu(i, cvcpu, vcpu->kvm) {
int cpir = cvcpu->arch.shared->pir;
if ((param & PPC_DBELL_MSG_BRDCAST) || (cpir == pir)) {
set_bit(prio, &cvcpu->arch.pending_exceptions);
kvm_vcpu_kick(cvcpu);
}
}
return EMULATE_DONE;
}
#endif
static int kvmppc_e500_emul_ehpriv(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int inst, int *advance)
{
int emulated = EMULATE_DONE;
switch (get_oc(inst)) {
case EHPRIV_OC_DEBUG:
run->exit_reason = KVM_EXIT_DEBUG;
run->debug.arch.address = vcpu->arch.regs.nip;
run->debug.arch.status = 0;
kvmppc_account_exit(vcpu, DEBUG_EXITS);
emulated = EMULATE_EXIT_USER;
*advance = 0;
break;
default:
emulated = EMULATE_FAIL;
}
return emulated;
}
static int kvmppc_e500_emul_dcbtls(struct kvm_vcpu *vcpu)
{
struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
/* Always fail to lock the cache */
vcpu_e500->l1csr0 |= L1CSR0_CUL;
return EMULATE_DONE;
}
static int kvmppc_e500_emul_mftmr(struct kvm_vcpu *vcpu, unsigned int inst,
int rt)
{
/* Expose one thread per vcpu */
if (get_tmrn(inst) == TMRN_TMCFG0) {
kvmppc_set_gpr(vcpu, rt,
1 | (1 << TMRN_TMCFG0_NATHRD_SHIFT));
return EMULATE_DONE;
}
return EMULATE_FAIL;
}
int kvmppc_core_emulate_op_e500(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int inst, int *advance)
{
int emulated = EMULATE_DONE;
int ra = get_ra(inst);
int rb = get_rb(inst);
int rt = get_rt(inst);
gva_t ea;
switch (get_op(inst)) {
case 31:
switch (get_xop(inst)) {
case XOP_DCBTLS:
emulated = kvmppc_e500_emul_dcbtls(vcpu);
break;
#ifdef CONFIG_KVM_E500MC
case XOP_MSGSND:
emulated = kvmppc_e500_emul_msgsnd(vcpu, rb);
break;
case XOP_MSGCLR:
emulated = kvmppc_e500_emul_msgclr(vcpu, rb);
break;
#endif
case XOP_TLBRE:
emulated = kvmppc_e500_emul_tlbre(vcpu);
break;
case XOP_TLBWE:
emulated = kvmppc_e500_emul_tlbwe(vcpu);
break;
case XOP_TLBSX:
ea = kvmppc_get_ea_indexed(vcpu, ra, rb);
emulated = kvmppc_e500_emul_tlbsx(vcpu, ea);
break;
case XOP_TLBILX: {
int type = rt & 0x3;
ea = kvmppc_get_ea_indexed(vcpu, ra, rb);
emulated = kvmppc_e500_emul_tlbilx(vcpu, type, ea);
break;
}
case XOP_TLBIVAX:
ea = kvmppc_get_ea_indexed(vcpu, ra, rb);
emulated = kvmppc_e500_emul_tlbivax(vcpu, ea);
break;
case XOP_MFTMR:
emulated = kvmppc_e500_emul_mftmr(vcpu, inst, rt);
break;
case XOP_EHPRIV:
emulated = kvmppc_e500_emul_ehpriv(run, vcpu, inst,
advance);
break;
default:
emulated = EMULATE_FAIL;
}
break;
default:
emulated = EMULATE_FAIL;
}
if (emulated == EMULATE_FAIL)
emulated = kvmppc_booke_emulate_op(run, vcpu, inst, advance);
return emulated;
}
int kvmppc_core_emulate_mtspr_e500(struct kvm_vcpu *vcpu, int sprn, ulong spr_val)
{
struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
int emulated = EMULATE_DONE;
switch (sprn) {
#ifndef CONFIG_KVM_BOOKE_HV
case SPRN_PID:
kvmppc_set_pid(vcpu, spr_val);
break;
case SPRN_PID1:
if (spr_val != 0)
return EMULATE_FAIL;
vcpu_e500->pid[1] = spr_val;
break;
case SPRN_PID2:
if (spr_val != 0)
return EMULATE_FAIL;
vcpu_e500->pid[2] = spr_val;
break;
case SPRN_MAS0:
vcpu->arch.shared->mas0 = spr_val;
break;
case SPRN_MAS1:
vcpu->arch.shared->mas1 = spr_val;
break;
case SPRN_MAS2:
vcpu->arch.shared->mas2 = spr_val;
break;
case SPRN_MAS3:
vcpu->arch.shared->mas7_3 &= ~(u64)0xffffffff;
vcpu->arch.shared->mas7_3 |= spr_val;
break;
case SPRN_MAS4:
vcpu->arch.shared->mas4 = spr_val;
break;
case SPRN_MAS6:
vcpu->arch.shared->mas6 = spr_val;
break;
case SPRN_MAS7:
vcpu->arch.shared->mas7_3 &= (u64)0xffffffff;
vcpu->arch.shared->mas7_3 |= (u64)spr_val << 32;
break;
#endif
case SPRN_L1CSR0:
vcpu_e500->l1csr0 = spr_val;
vcpu_e500->l1csr0 &= ~(L1CSR0_DCFI | L1CSR0_CLFC);
break;
case SPRN_L1CSR1:
vcpu_e500->l1csr1 = spr_val;
vcpu_e500->l1csr1 &= ~(L1CSR1_ICFI | L1CSR1_ICLFR);
break;
case SPRN_HID0:
vcpu_e500->hid0 = spr_val;
break;
case SPRN_HID1:
vcpu_e500->hid1 = spr_val;
break;
case SPRN_MMUCSR0:
emulated = kvmppc_e500_emul_mt_mmucsr0(vcpu_e500,
spr_val);
break;
case SPRN_PWRMGTCR0:
/*
* Guest relies on host power management configurations
* Treat the request as a general store
*/
vcpu->arch.pwrmgtcr0 = spr_val;
break;
case SPRN_BUCSR:
/*
* If we are here, it means that we have already flushed the
* branch predictor, so just return to guest.
*/
break;
/* extra exceptions */
#ifdef CONFIG_SPE_POSSIBLE
case SPRN_IVOR32:
vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_UNAVAIL] = spr_val;
break;
case SPRN_IVOR33:
vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_DATA] = spr_val;
break;
case SPRN_IVOR34:
vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_ROUND] = spr_val;
break;
#endif
#ifdef CONFIG_ALTIVEC
case SPRN_IVOR32:
vcpu->arch.ivor[BOOKE_IRQPRIO_ALTIVEC_UNAVAIL] = spr_val;
break;
case SPRN_IVOR33:
vcpu->arch.ivor[BOOKE_IRQPRIO_ALTIVEC_ASSIST] = spr_val;
break;
#endif
case SPRN_IVOR35:
vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] = spr_val;
break;
#ifdef CONFIG_KVM_BOOKE_HV
case SPRN_IVOR36:
vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL] = spr_val;
break;
case SPRN_IVOR37:
vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT] = spr_val;
break;
#endif
default:
emulated = kvmppc_booke_emulate_mtspr(vcpu, sprn, spr_val);
}
return emulated;
}
int kvmppc_core_emulate_mfspr_e500(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val)
{
struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
int emulated = EMULATE_DONE;
switch (sprn) {
#ifndef CONFIG_KVM_BOOKE_HV
case SPRN_PID:
*spr_val = vcpu_e500->pid[0];
break;
case SPRN_PID1:
*spr_val = vcpu_e500->pid[1];
break;
case SPRN_PID2:
*spr_val = vcpu_e500->pid[2];
break;
case SPRN_MAS0:
*spr_val = vcpu->arch.shared->mas0;
break;
case SPRN_MAS1:
*spr_val = vcpu->arch.shared->mas1;
break;
case SPRN_MAS2:
*spr_val = vcpu->arch.shared->mas2;
break;
case SPRN_MAS3:
*spr_val = (u32)vcpu->arch.shared->mas7_3;
break;
case SPRN_MAS4:
*spr_val = vcpu->arch.shared->mas4;
break;
case SPRN_MAS6:
*spr_val = vcpu->arch.shared->mas6;
break;
case SPRN_MAS7:
*spr_val = vcpu->arch.shared->mas7_3 >> 32;
break;
#endif
case SPRN_DECAR:
*spr_val = vcpu->arch.decar;
break;
case SPRN_TLB0CFG:
*spr_val = vcpu->arch.tlbcfg[0];
break;
case SPRN_TLB1CFG:
*spr_val = vcpu->arch.tlbcfg[1];
break;
case SPRN_TLB0PS:
if (!has_feature(vcpu, VCPU_FTR_MMU_V2))
return EMULATE_FAIL;
*spr_val = vcpu->arch.tlbps[0];
break;
case SPRN_TLB1PS:
if (!has_feature(vcpu, VCPU_FTR_MMU_V2))
return EMULATE_FAIL;
*spr_val = vcpu->arch.tlbps[1];
break;
case SPRN_L1CSR0:
*spr_val = vcpu_e500->l1csr0;
break;
case SPRN_L1CSR1:
*spr_val = vcpu_e500->l1csr1;
break;
case SPRN_HID0:
*spr_val = vcpu_e500->hid0;
break;
case SPRN_HID1:
*spr_val = vcpu_e500->hid1;
break;
case SPRN_SVR:
*spr_val = vcpu_e500->svr;
break;
case SPRN_MMUCSR0:
*spr_val = 0;
break;
case SPRN_MMUCFG:
*spr_val = vcpu->arch.mmucfg;
break;
case SPRN_EPTCFG:
if (!has_feature(vcpu, VCPU_FTR_MMU_V2))
return EMULATE_FAIL;
/*
* Legacy Linux guests access EPTCFG register even if the E.PT
* category is disabled in the VM. Give them a chance to live.
*/
*spr_val = vcpu->arch.eptcfg;
break;
case SPRN_PWRMGTCR0:
*spr_val = vcpu->arch.pwrmgtcr0;
break;
/* extra exceptions */
#ifdef CONFIG_SPE_POSSIBLE
case SPRN_IVOR32:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_UNAVAIL];
break;
case SPRN_IVOR33:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_DATA];
break;
case SPRN_IVOR34:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_ROUND];
break;
#endif
#ifdef CONFIG_ALTIVEC
case SPRN_IVOR32:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_ALTIVEC_UNAVAIL];
break;
case SPRN_IVOR33:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_ALTIVEC_ASSIST];
break;
#endif
case SPRN_IVOR35:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
break;
#ifdef CONFIG_KVM_BOOKE_HV
case SPRN_IVOR36:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL];
break;
case SPRN_IVOR37:
*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT];
break;
#endif
default:
emulated = kvmppc_booke_emulate_mfspr(vcpu, sprn, spr_val);
}
return emulated;
}
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