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_ppc.h>
  24
  25 #include "booke.h"
  26 #include "e500.h"
  27
  28 void kvmppc_core_load_host_debugstate(struct kvm_vcpu *vcpu)
  29 {
  30 }
  31
  32 void kvmppc_core_load_guest_debugstate(struct kvm_vcpu *vcpu)
  33 {
  34 }
  35
  36 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
  37 {
  38         kvmppc_booke_vcpu_load(vcpu, cpu);
  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         kvmppc_booke_vcpu_put(vcpu);
  52 }
  53
  54 int kvmppc_core_check_processor_compat(void)
  55 {
  56         int r;
  57
  58         if (strcmp(cur_cpu_spec->cpu_name, "e500v2") == 0)
  59                 r = 0;
  60         else
  61                 r = -ENOTSUPP;
  62
  63         return r;
  64 }
  65
  66 int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
  67 {
  68         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
  69
  70         kvmppc_e500_tlb_setup(vcpu_e500);
  71
  72         /* Registers init */
  73         vcpu->arch.pvr = mfspr(SPRN_PVR);
  74         vcpu_e500->svr = mfspr(SPRN_SVR);
  75
  76         vcpu->arch.cpu_type = KVM_CPU_E500V2;
  77
  78         return 0;
  79 }
  80
  81 /* 'linear_address' is actually an encoding of AS|PID|EADDR . */
  82 int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
  83                                struct kvm_translation *tr)
  84 {
  85         int index;
  86         gva_t eaddr;
  87         u8 pid;
  88         u8 as;
  89
  90         eaddr = tr->linear_address;
  91         pid = (tr->linear_address >> 32) & 0xff;
  92         as = (tr->linear_address >> 40) & 0x1;
  93
  94         index = kvmppc_e500_tlb_search(vcpu, eaddr, pid, as);
  95         if (index < 0) {
  96                 tr->valid = 0;
  97                 return 0;
  98         }
  99
 100         tr->physical_address = kvmppc_mmu_xlate(vcpu, index, eaddr);
 101         /* XXX what does "writeable" and "usermode" even mean? */
 102         tr->valid = 1;
 103
 104         return 0;
 105 }
 106
 107 void kvmppc_core_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 108 {
 109         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 110
 111         sregs->u.e.features |= KVM_SREGS_E_ARCH206_MMU | KVM_SREGS_E_SPE |
 112                                KVM_SREGS_E_PM;
 113         sregs->u.e.impl_id = KVM_SREGS_E_IMPL_FSL;
 114
 115         sregs->u.e.impl.fsl.features = 0;
 116         sregs->u.e.impl.fsl.svr = vcpu_e500->svr;
 117         sregs->u.e.impl.fsl.hid0 = vcpu_e500->hid0;
 118         sregs->u.e.impl.fsl.mcar = vcpu_e500->mcar;
 119
 120         sregs->u.e.mas0 = vcpu->arch.shared->mas0;
 121         sregs->u.e.mas1 = vcpu->arch.shared->mas1;
 122         sregs->u.e.mas2 = vcpu->arch.shared->mas2;
 123         sregs->u.e.mas7_3 = vcpu->arch.shared->mas7_3;
 124         sregs->u.e.mas4 = vcpu->arch.shared->mas4;
 125         sregs->u.e.mas6 = vcpu->arch.shared->mas6;
 126
 127         sregs->u.e.mmucfg = mfspr(SPRN_MMUCFG);
 128         sregs->u.e.tlbcfg[0] = vcpu_e500->tlb0cfg;
 129         sregs->u.e.tlbcfg[1] = vcpu_e500->tlb1cfg;
 130         sregs->u.e.tlbcfg[2] = 0;
 131         sregs->u.e.tlbcfg[3] = 0;
 132
 133         sregs->u.e.ivor_high[0] = vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_UNAVAIL];
 134         sregs->u.e.ivor_high[1] = vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_DATA];
 135         sregs->u.e.ivor_high[2] = vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_ROUND];
 136         sregs->u.e.ivor_high[3] =
 137                 vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
 138
 139         kvmppc_get_sregs_ivor(vcpu, sregs);
 140 }
 141
 142 int kvmppc_core_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 143 {
 144         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 145
 146         if (sregs->u.e.impl_id == KVM_SREGS_E_IMPL_FSL) {
 147                 vcpu_e500->svr = sregs->u.e.impl.fsl.svr;
 148                 vcpu_e500->hid0 = sregs->u.e.impl.fsl.hid0;
 149                 vcpu_e500->mcar = sregs->u.e.impl.fsl.mcar;
 150         }
 151
 152         if (sregs->u.e.features & KVM_SREGS_E_ARCH206_MMU) {
 153                 vcpu->arch.shared->mas0 = sregs->u.e.mas0;
 154                 vcpu->arch.shared->mas1 = sregs->u.e.mas1;
 155                 vcpu->arch.shared->mas2 = sregs->u.e.mas2;
 156                 vcpu->arch.shared->mas7_3 = sregs->u.e.mas7_3;
 157                 vcpu->arch.shared->mas4 = sregs->u.e.mas4;
 158                 vcpu->arch.shared->mas6 = sregs->u.e.mas6;
 159         }
 160
 161         if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
 162                 return 0;
 163
 164         if (sregs->u.e.features & KVM_SREGS_E_SPE) {
 165                 vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_UNAVAIL] =
 166                         sregs->u.e.ivor_high[0];
 167                 vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_DATA] =
 168                         sregs->u.e.ivor_high[1];
 169                 vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_ROUND] =
 170                         sregs->u.e.ivor_high[2];
 171         }
 172
 173         if (sregs->u.e.features & KVM_SREGS_E_PM) {
 174                 vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] =
 175                         sregs->u.e.ivor_high[3];
 176         }
 177
 178         return kvmppc_set_sregs_ivor(vcpu, sregs);
 179 }
 180
 181 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
 182 {
 183         struct kvmppc_vcpu_e500 *vcpu_e500;
 184         struct kvm_vcpu *vcpu;
 185         int err;
 186
 187         vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 188         if (!vcpu_e500) {
 189                 err = -ENOMEM;
 190                 goto out;
 191         }
 192
 193         vcpu = &vcpu_e500->vcpu;
 194         err = kvm_vcpu_init(vcpu, kvm, id);
 195         if (err)
 196                 goto free_vcpu;
 197
 198         err = kvmppc_e500_tlb_init(vcpu_e500);
 199         if (err)
 200                 goto uninit_vcpu;
 201
 202         vcpu->arch.shared = (void*)__get_free_page(GFP_KERNEL|__GFP_ZERO);
 203         if (!vcpu->arch.shared)
 204                 goto uninit_tlb;
 205
 206         return vcpu;
 207
 208 uninit_tlb:
 209         kvmppc_e500_tlb_uninit(vcpu_e500);
 210 uninit_vcpu:
 211         kvm_vcpu_uninit(vcpu);
 212 free_vcpu:
 213         kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
 214 out:
 215         return ERR_PTR(err);
 216 }
 217
 218 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
 219 {
 220         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 221
 222         free_page((unsigned long)vcpu->arch.shared);
 223         kvm_vcpu_uninit(vcpu);
 224         kvmppc_e500_tlb_uninit(vcpu_e500);
 225         kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
 226 }
 227
 228 int kvmppc_core_init_vm(struct kvm *kvm)
 229 {
 230         return 0;
 231 }
 232
 233 void kvmppc_core_destroy_vm(struct kvm *kvm)
 234 {
 235 }
 236
 237 static int __init kvmppc_e500_init(void)
 238 {
 239         int r, i;
 240         unsigned long ivor[3];
 241         unsigned long max_ivor = 0;
 242
 243         r = kvmppc_core_check_processor_compat();
 244         if (r)
 245                 return r;
 246
 247         r = kvmppc_booke_init();
 248         if (r)
 249                 return r;
 250
 251         /* copy extra E500 exception handlers */
 252         ivor[0] = mfspr(SPRN_IVOR32);
 253         ivor[1] = mfspr(SPRN_IVOR33);
 254         ivor[2] = mfspr(SPRN_IVOR34);
 255         for (i = 0; i < 3; i++) {
 256                 if (ivor[i] > max_ivor)
 257                         max_ivor = ivor[i];
 258
 259                 memcpy((void *)kvmppc_booke_handlers + ivor[i],
 260                        kvmppc_handlers_start + (i + 16) * kvmppc_handler_len,
 261                        kvmppc_handler_len);
 262         }
 263         flush_icache_range(kvmppc_booke_handlers,
 264                         kvmppc_booke_handlers + max_ivor + kvmppc_handler_len);
 265
 266         return kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
 267 }
 268
 269 static void __exit kvmppc_e500_exit(void)
 270 {
 271         kvmppc_booke_exit();
 272 }
 273
 274 module_init(kvmppc_e500_init);
 275 module_exit(kvmppc_e500_exit);