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linux/arch/powerpc/kvm/e500_emulate.c
Scott Wood b59049720d KVM: PPC: Paravirtualize SPRG4-7, ESR, PIR, MASn 
This allows additional registers to be accessed by the guest
in PR-mode KVM without trapping.

SPRG4-7 are readable from userspace.  On booke, KVM will sync
these registers when it enters the guest, so that accesses from
guest userspace will work.  The guest kernel, OTOH, must consistently
use either the real registers or the shared area between exits.  This
also applies to the already-paravirted SPRG3.

On non-booke, it's not clear to what extent SPRG4-7 are supported
(they're not architected for book3s, but exist on at least some classic
chips).  They are copied in the get/set regs ioctls, but I do not see any
non-booke emulation.  I also do not see any syncing with real registers
(in PR-mode) including the user-readable SPRG3.  This patch should not
make that situation any worse.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
2012-03-05 14:52:26 +02:00

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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/kvm_e500.h>
#include "booke.h"
#include "e500_tlb.h"
#define XOP_TLBIVAX 786
#define XOP_TLBSX 914
#define XOP_TLBRE 946
#define XOP_TLBWE 978
int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int inst, int *advance)
{
int emulated = EMULATE_DONE;
int ra;
int rb;
switch (get_op(inst)) {
case 31:
switch (get_xop(inst)) {
case XOP_TLBRE:
emulated = kvmppc_e500_emul_tlbre(vcpu);
break;
case XOP_TLBWE:
emulated = kvmppc_e500_emul_tlbwe(vcpu);
break;
case XOP_TLBSX:
rb = get_rb(inst);
emulated = kvmppc_e500_emul_tlbsx(vcpu,rb);
break;
case XOP_TLBIVAX:
ra = get_ra(inst);
rb = get_rb(inst);
emulated = kvmppc_e500_emul_tlbivax(vcpu, ra, rb);
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(struct kvm_vcpu *vcpu, int sprn, int rs)
{
struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
int emulated = EMULATE_DONE;
ulong spr_val = kvmppc_get_gpr(vcpu, rs);
switch (sprn) {
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;
case SPRN_L1CSR0:
vcpu_e500->l1csr0 = spr_val;
vcpu_e500->l1csr0 &= ~(L1CSR0_DCFI | L1CSR0_CLFC);
break;
case SPRN_L1CSR1:
vcpu_e500->l1csr1 = spr_val; 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;
/* extra exceptions */
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;
case SPRN_IVOR35:
vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] = spr_val;
break;
default:
emulated = kvmppc_booke_emulate_mtspr(vcpu, sprn, rs);
}
return emulated;
}
int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
{
struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
int emulated = EMULATE_DONE;
unsigned long val;
switch (sprn) {
case SPRN_PID:
kvmppc_set_gpr(vcpu, rt, vcpu_e500->pid[0]); break;
case SPRN_PID1:
kvmppc_set_gpr(vcpu, rt, vcpu_e500->pid[1]); break;
case SPRN_PID2:
kvmppc_set_gpr(vcpu, rt, vcpu_e500->pid[2]); break;
case SPRN_MAS0:
kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->mas0); break;
case SPRN_MAS1:
kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->mas1); break;
case SPRN_MAS2:
kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->mas2); break;
case SPRN_MAS3:
val = (u32)vcpu->arch.shared->mas7_3;
kvmppc_set_gpr(vcpu, rt, val);
break;
case SPRN_MAS4:
kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->mas4); break;
case SPRN_MAS6:
kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->mas6); break;
case SPRN_MAS7:
val = vcpu->arch.shared->mas7_3 >> 32;
kvmppc_set_gpr(vcpu, rt, val);
break;
case SPRN_TLB0CFG:
kvmppc_set_gpr(vcpu, rt, vcpu_e500->tlb0cfg); break;
case SPRN_TLB1CFG:
kvmppc_set_gpr(vcpu, rt, vcpu_e500->tlb1cfg); break;
case SPRN_L1CSR0:
kvmppc_set_gpr(vcpu, rt, vcpu_e500->l1csr0); break;
case SPRN_L1CSR1:
kvmppc_set_gpr(vcpu, rt, vcpu_e500->l1csr1); break;
case SPRN_HID0:
kvmppc_set_gpr(vcpu, rt, vcpu_e500->hid0); break;
case SPRN_HID1:
kvmppc_set_gpr(vcpu, rt, vcpu_e500->hid1); break;
case SPRN_SVR:
kvmppc_set_gpr(vcpu, rt, vcpu_e500->svr); break;
case SPRN_MMUCSR0:
kvmppc_set_gpr(vcpu, rt, 0); break;
case SPRN_MMUCFG:
kvmppc_set_gpr(vcpu, rt, mfspr(SPRN_MMUCFG)); break;
/* extra exceptions */
case SPRN_IVOR32:
kvmppc_set_gpr(vcpu, rt, vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_UNAVAIL]);
break;
case SPRN_IVOR33:
kvmppc_set_gpr(vcpu, rt, vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_DATA]);
break;
case SPRN_IVOR34:
kvmppc_set_gpr(vcpu, rt, vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_ROUND]);
break;
case SPRN_IVOR35:
kvmppc_set_gpr(vcpu, rt, vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR]);
break;
default:
emulated = kvmppc_booke_emulate_mfspr(vcpu, sprn, rt);
}
return emulated;
}
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