arch/powerpc/kvm/e500.c

   1 /*
   2  * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All rights reserved.
   3  *
   4  * Author: Yu Liu, <yu.liu@freescale.com>
   5  *
   6  * Description:
   7  * This file is derived from arch/powerpc/kvm/44x.c,
   8  * by Hollis Blanchard <hollisb@us.ibm.com>.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License, version 2, as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/kvm_host.h>
  16 #include <linux/slab.h>
  17 #include <linux/err.h>
  18 #include <linux/export.h>
  19
  20 #include <asm/reg.h>
  21 #include <asm/cputable.h>
  22 #include <asm/tlbflush.h>
  23 #include <asm/kvm_e500.h>
  24 #include <asm/kvm_ppc.h>
  25
  26 #include "booke.h"
  27 #include "e500_tlb.h"
  28
  29 void kvmppc_core_load_host_debugstate(struct kvm_vcpu *vcpu)
  30 {
  31 }
  32
  33 void kvmppc_core_load_guest_debugstate(struct kvm_vcpu *vcpu)
  34 {
  35 }
  36
  37 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
  38 {
  39         kvmppc_e500_tlb_load(vcpu, cpu);
  40 }
  41
  42 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
  43 {
  44         kvmppc_e500_tlb_put(vcpu);
  45
  46 #ifdef CONFIG_SPE
  47         if (vcpu->arch.shadow_msr & MSR_SPE)
  48                 kvmppc_vcpu_disable_spe(vcpu);
  49 #endif
  50 }
  51
  52 int kvmppc_core_check_processor_compat(void)
  53 {
  54         int r;
  55
  56         if (strcmp(cur_cpu_spec->cpu_name, "e500v2") == 0)
  57                 r = 0;
  58         else
  59                 r = -ENOTSUPP;
  60
  61         return r;
  62 }
  63
  64 int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
  65 {
  66         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
  67
  68         kvmppc_e500_tlb_setup(vcpu_e500);
  69
  70         /* Registers init */
  71         vcpu->arch.pvr = mfspr(SPRN_PVR);
  72         vcpu_e500->svr = mfspr(SPRN_SVR);
  73
  74         vcpu->arch.cpu_type = KVM_CPU_E500V2;
  75
  76         return 0;
  77 }
  78
  79 /* 'linear_address' is actually an encoding of AS|PID|EADDR . */
  80 int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
  81                                struct kvm_translation *tr)
  82 {
  83         int index;
  84         gva_t eaddr;
  85         u8 pid;
  86         u8 as;
  87
  88         eaddr = tr->linear_address;
  89         pid = (tr->linear_address >> 32) & 0xff;
  90         as = (tr->linear_address >> 40) & 0x1;
  91
  92         index = kvmppc_e500_tlb_search(vcpu, eaddr, pid, as);
  93         if (index < 0) {
  94                 tr->valid = 0;
  95                 return 0;
  96         }
  97
  98         tr->physical_address = kvmppc_mmu_xlate(vcpu, index, eaddr);
  99         /* XXX what does "writeable" and "usermode" even mean? */
 100         tr->valid = 1;
 101
 102         return 0;
 103 }
 104
 105 void kvmppc_core_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 106 {
 107         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 108
 109         sregs->u.e.features |= KVM_SREGS_E_ARCH206_MMU | KVM_SREGS_E_SPE |
 110                                KVM_SREGS_E_PM;
 111         sregs->u.e.impl_id = KVM_SREGS_E_IMPL_FSL;
 112
 113         sregs->u.e.impl.fsl.features = 0;
 114         sregs->u.e.impl.fsl.svr = vcpu_e500->svr;
 115         sregs->u.e.impl.fsl.hid0 = vcpu_e500->hid0;
 116         sregs->u.e.impl.fsl.mcar = vcpu_e500->mcar;
 117
 118         sregs->u.e.mas0 = vcpu->arch.shared->mas0;
 119         sregs->u.e.mas1 = vcpu->arch.shared->mas1;
 120         sregs->u.e.mas2 = vcpu->arch.shared->mas2;
 121         sregs->u.e.mas7_3 = vcpu->arch.shared->mas7_3;
 122         sregs->u.e.mas4 = vcpu->arch.shared->mas4;
 123         sregs->u.e.mas6 = vcpu->arch.shared->mas6;
 124
 125         sregs->u.e.mmucfg = mfspr(SPRN_MMUCFG);
 126         sregs->u.e.tlbcfg[0] = vcpu_e500->tlb0cfg;
 127         sregs->u.e.tlbcfg[1] = vcpu_e500->tlb1cfg;
 128         sregs->u.e.tlbcfg[2] = 0;
 129         sregs->u.e.tlbcfg[3] = 0;
 130
 131         sregs->u.e.ivor_high[0] = vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_UNAVAIL];
 132         sregs->u.e.ivor_high[1] = vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_DATA];
 133         sregs->u.e.ivor_high[2] = vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_ROUND];
 134         sregs->u.e.ivor_high[3] =
 135                 vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
 136
 137         kvmppc_get_sregs_ivor(vcpu, sregs);
 138 }
 139
 140 int kvmppc_core_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 141 {
 142         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 143
 144         if (sregs->u.e.impl_id == KVM_SREGS_E_IMPL_FSL) {
 145                 vcpu_e500->svr = sregs->u.e.impl.fsl.svr;
 146                 vcpu_e500->hid0 = sregs->u.e.impl.fsl.hid0;
 147                 vcpu_e500->mcar = sregs->u.e.impl.fsl.mcar;
 148         }
 149
 150         if (sregs->u.e.features & KVM_SREGS_E_ARCH206_MMU) {
 151                 vcpu->arch.shared->mas0 = sregs->u.e.mas0;
 152                 vcpu->arch.shared->mas1 = sregs->u.e.mas1;
 153                 vcpu->arch.shared->mas2 = sregs->u.e.mas2;
 154                 vcpu->arch.shared->mas7_3 = sregs->u.e.mas7_3;
 155                 vcpu->arch.shared->mas4 = sregs->u.e.mas4;
 156                 vcpu->arch.shared->mas6 = sregs->u.e.mas6;
 157         }
 158
 159         if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
 160                 return 0;
 161
 162         if (sregs->u.e.features & KVM_SREGS_E_SPE) {
 163                 vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_UNAVAIL] =
 164                         sregs->u.e.ivor_high[0];
 165                 vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_DATA] =
 166                         sregs->u.e.ivor_high[1];
 167                 vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_ROUND] =
 168                         sregs->u.e.ivor_high[2];
 169         }
 170
 171         if (sregs->u.e.features & KVM_SREGS_E_PM) {
 172                 vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] =
 173                         sregs->u.e.ivor_high[3];
 174         }
 175
 176         return kvmppc_set_sregs_ivor(vcpu, sregs);
 177 }
 178
 179 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
 180 {
 181         struct kvmppc_vcpu_e500 *vcpu_e500;
 182         struct kvm_vcpu *vcpu;
 183         int err;
 184
 185         vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 186         if (!vcpu_e500) {
 187                 err = -ENOMEM;
 188                 goto out;
 189         }
 190
 191         vcpu = &vcpu_e500->vcpu;
 192         err = kvm_vcpu_init(vcpu, kvm, id);
 193         if (err)
 194                 goto free_vcpu;
 195
 196         err = kvmppc_e500_tlb_init(vcpu_e500);
 197         if (err)
 198                 goto uninit_vcpu;
 199
 200         vcpu->arch.shared = (void*)__get_free_page(GFP_KERNEL|__GFP_ZERO);
 201         if (!vcpu->arch.shared)
 202                 goto uninit_tlb;
 203
 204         return vcpu;
 205
 206 uninit_tlb:
 207         kvmppc_e500_tlb_uninit(vcpu_e500);
 208 uninit_vcpu:
 209         kvm_vcpu_uninit(vcpu);
 210 free_vcpu:
 211         kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
 212 out:
 213         return ERR_PTR(err);
 214 }
 215
 216 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
 217 {
 218         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 219
 220         free_page((unsigned long)vcpu->arch.shared);
 221         kvm_vcpu_uninit(vcpu);
 222         kvmppc_e500_tlb_uninit(vcpu_e500);
 223         kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
 224 }
 225
 226 static int __init kvmppc_e500_init(void)
 227 {
 228         int r, i;
 229         unsigned long ivor[3];
 230         unsigned long max_ivor = 0;
 231
 232         r = kvmppc_core_check_processor_compat();
 233         if (r)
 234                 return r;
 235
 236         r = kvmppc_booke_init();
 237         if (r)
 238                 return r;
 239
 240         /* copy extra E500 exception handlers */
 241         ivor[0] = mfspr(SPRN_IVOR32);
 242         ivor[1] = mfspr(SPRN_IVOR33);
 243         ivor[2] = mfspr(SPRN_IVOR34);
 244         for (i = 0; i < 3; i++) {
 245                 if (ivor[i] > max_ivor)
 246                         max_ivor = ivor[i];
 247
 248                 memcpy((void *)kvmppc_booke_handlers + ivor[i],
 249                        kvmppc_handlers_start + (i + 16) * kvmppc_handler_len,
 250                        kvmppc_handler_len);
 251         }
 252         flush_icache_range(kvmppc_booke_handlers,
 253                         kvmppc_booke_handlers + max_ivor + kvmppc_handler_len);
 254
 255         return kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
 256 }
 257
 258 static void __exit kvmppc_e500_exit(void)
 259 {
 260         kvmppc_booke_exit();
 261 }
 262
 263 module_init(kvmppc_e500_init);
 264 module_exit(kvmppc_e500_exit);