arch/powerpc/kvm/e500mc.c

   1 /*
   2  * Copyright (C) 2010,2012 Freescale Semiconductor, Inc. All rights reserved.
   3  *
   4  * Author: Varun Sethi, <varun.sethi@freescale.com>
   5  *
   6  * Description:
   7  * This file is derived from arch/powerpc/kvm/e500.c,
   8  * by Yu Liu <yu.liu@freescale.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 #include <asm/dbell.h>
  25
  26 #include "booke.h"
  27 #include "e500.h"
  28
  29 void kvmppc_set_pending_interrupt(struct kvm_vcpu *vcpu, enum int_class type)
  30 {
  31         enum ppc_dbell dbell_type;
  32         unsigned long tag;
  33
  34         switch (type) {
  35         case INT_CLASS_NONCRIT:
  36                 dbell_type = PPC_G_DBELL;
  37                 break;
  38         case INT_CLASS_CRIT:
  39                 dbell_type = PPC_G_DBELL_CRIT;
  40                 break;
  41         case INT_CLASS_MC:
  42                 dbell_type = PPC_G_DBELL_MC;
  43                 break;
  44         default:
  45                 WARN_ONCE(1, "%s: unknown int type %d\n", __func__, type);
  46                 return;
  47         }
  48
  49
  50         tag = PPC_DBELL_LPID(vcpu->kvm->arch.lpid) | vcpu->vcpu_id;
  51         mb();
  52         ppc_msgsnd(dbell_type, 0, tag);
  53 }
  54
  55 /* gtlbe must not be mapped by more than one host tlb entry */
  56 void kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 *vcpu_e500,
  57                            struct kvm_book3e_206_tlb_entry *gtlbe)
  58 {
  59         unsigned int tid, ts;
  60         gva_t eaddr;
  61         u32 val, lpid;
  62         unsigned long flags;
  63
  64         ts = get_tlb_ts(gtlbe);
  65         tid = get_tlb_tid(gtlbe);
  66         lpid = vcpu_e500->vcpu.kvm->arch.lpid;
  67
  68         /* We search the host TLB to invalidate its shadow TLB entry */
  69         val = (tid << 16) | ts;
  70         eaddr = get_tlb_eaddr(gtlbe);
  71
  72         local_irq_save(flags);
  73
  74         mtspr(SPRN_MAS6, val);
  75         mtspr(SPRN_MAS5, MAS5_SGS | lpid);
  76
  77         asm volatile("tlbsx 0, %[eaddr]\n" : : [eaddr] "r" (eaddr));
  78         val = mfspr(SPRN_MAS1);
  79         if (val & MAS1_VALID) {
  80                 mtspr(SPRN_MAS1, val & ~MAS1_VALID);
  81                 asm volatile("tlbwe");
  82         }
  83         mtspr(SPRN_MAS5, 0);
  84         /* NOTE: tlbsx also updates mas8, so clear it for host tlbwe */
  85         mtspr(SPRN_MAS8, 0);
  86         isync();
  87
  88         local_irq_restore(flags);
  89 }
  90
  91 void kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 *vcpu_e500)
  92 {
  93         unsigned long flags;
  94
  95         local_irq_save(flags);
  96         mtspr(SPRN_MAS5, MAS5_SGS | vcpu_e500->vcpu.kvm->arch.lpid);
  97         asm volatile("tlbilxlpid");
  98         mtspr(SPRN_MAS5, 0);
  99         local_irq_restore(flags);
 100 }
 101
 102 void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid)
 103 {
 104         vcpu->arch.pid = pid;
 105 }
 106
 107 void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr)
 108 {
 109 }
 110
 111 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 112 {
 113         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 114
 115         kvmppc_booke_vcpu_load(vcpu, cpu);
 116
 117         mtspr(SPRN_LPID, vcpu->kvm->arch.lpid);
 118         mtspr(SPRN_EPCR, vcpu->arch.shadow_epcr);
 119         mtspr(SPRN_GPIR, vcpu->vcpu_id);
 120         mtspr(SPRN_MSRP, vcpu->arch.shadow_msrp);
 121         mtspr(SPRN_EPLC, vcpu->arch.eplc);
 122         mtspr(SPRN_EPSC, vcpu->arch.epsc);
 123
 124         mtspr(SPRN_GIVPR, vcpu->arch.ivpr);
 125         mtspr(SPRN_GIVOR2, vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE]);
 126         mtspr(SPRN_GIVOR8, vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL]);
 127         mtspr(SPRN_GSPRG0, (unsigned long)vcpu->arch.shared->sprg0);
 128         mtspr(SPRN_GSPRG1, (unsigned long)vcpu->arch.shared->sprg1);
 129         mtspr(SPRN_GSPRG2, (unsigned long)vcpu->arch.shared->sprg2);
 130         mtspr(SPRN_GSPRG3, (unsigned long)vcpu->arch.shared->sprg3);
 131
 132         mtspr(SPRN_GSRR0, vcpu->arch.shared->srr0);
 133         mtspr(SPRN_GSRR1, vcpu->arch.shared->srr1);
 134
 135         mtspr(SPRN_GEPR, vcpu->arch.epr);
 136         mtspr(SPRN_GDEAR, vcpu->arch.shared->dar);
 137         mtspr(SPRN_GESR, vcpu->arch.shared->esr);
 138
 139         if (vcpu->arch.oldpir != mfspr(SPRN_PIR))
 140                 kvmppc_e500_tlbil_all(vcpu_e500);
 141
 142         kvmppc_load_guest_fp(vcpu);
 143 }
 144
 145 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
 146 {
 147         vcpu->arch.eplc = mfspr(SPRN_EPLC);
 148         vcpu->arch.epsc = mfspr(SPRN_EPSC);
 149
 150         vcpu->arch.shared->sprg0 = mfspr(SPRN_GSPRG0);
 151         vcpu->arch.shared->sprg1 = mfspr(SPRN_GSPRG1);
 152         vcpu->arch.shared->sprg2 = mfspr(SPRN_GSPRG2);
 153         vcpu->arch.shared->sprg3 = mfspr(SPRN_GSPRG3);
 154
 155         vcpu->arch.shared->srr0 = mfspr(SPRN_GSRR0);
 156         vcpu->arch.shared->srr1 = mfspr(SPRN_GSRR1);
 157
 158         vcpu->arch.epr = mfspr(SPRN_GEPR);
 159         vcpu->arch.shared->dar = mfspr(SPRN_GDEAR);
 160         vcpu->arch.shared->esr = mfspr(SPRN_GESR);
 161
 162         vcpu->arch.oldpir = mfspr(SPRN_PIR);
 163
 164         kvmppc_booke_vcpu_put(vcpu);
 165 }
 166
 167 int kvmppc_core_check_processor_compat(void)
 168 {
 169         int r;
 170
 171         if (strcmp(cur_cpu_spec->cpu_name, "e500mc") == 0)
 172                 r = 0;
 173         else if (strcmp(cur_cpu_spec->cpu_name, "e5500") == 0)
 174                 r = 0;
 175         else
 176                 r = -ENOTSUPP;
 177
 178         return r;
 179 }
 180
 181 int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
 182 {
 183         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 184
 185         vcpu->arch.shadow_epcr = SPRN_EPCR_DSIGS | SPRN_EPCR_DGTMI | \
 186                                  SPRN_EPCR_DUVD;
 187 #ifdef CONFIG_64BIT
 188         vcpu->arch.shadow_epcr |= SPRN_EPCR_ICM;
 189 #endif
 190         vcpu->arch.shadow_msrp = MSRP_UCLEP | MSRP_DEP | MSRP_PMMP;
 191         vcpu->arch.eplc = EPC_EGS | (vcpu->kvm->arch.lpid << EPC_ELPID_SHIFT);
 192         vcpu->arch.epsc = vcpu->arch.eplc;
 193
 194         vcpu->arch.pvr = mfspr(SPRN_PVR);
 195         vcpu_e500->svr = mfspr(SPRN_SVR);
 196
 197         vcpu->arch.cpu_type = KVM_CPU_E500MC;
 198
 199         return 0;
 200 }
 201
 202 void kvmppc_core_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 203 {
 204         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 205
 206         sregs->u.e.features |= KVM_SREGS_E_ARCH206_MMU | KVM_SREGS_E_PM |
 207                                KVM_SREGS_E_PC;
 208         sregs->u.e.impl_id = KVM_SREGS_E_IMPL_FSL;
 209
 210         sregs->u.e.impl.fsl.features = 0;
 211         sregs->u.e.impl.fsl.svr = vcpu_e500->svr;
 212         sregs->u.e.impl.fsl.hid0 = vcpu_e500->hid0;
 213         sregs->u.e.impl.fsl.mcar = vcpu_e500->mcar;
 214
 215         kvmppc_get_sregs_e500_tlb(vcpu, sregs);
 216
 217         sregs->u.e.ivor_high[3] =
 218                 vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
 219         sregs->u.e.ivor_high[4] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL];
 220         sregs->u.e.ivor_high[5] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT];
 221
 222         kvmppc_get_sregs_ivor(vcpu, sregs);
 223 }
 224
 225 int kvmppc_core_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 226 {
 227         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 228         int ret;
 229
 230         if (sregs->u.e.impl_id == KVM_SREGS_E_IMPL_FSL) {
 231                 vcpu_e500->svr = sregs->u.e.impl.fsl.svr;
 232                 vcpu_e500->hid0 = sregs->u.e.impl.fsl.hid0;
 233                 vcpu_e500->mcar = sregs->u.e.impl.fsl.mcar;
 234         }
 235
 236         ret = kvmppc_set_sregs_e500_tlb(vcpu, sregs);
 237         if (ret < 0)
 238                 return ret;
 239
 240         if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
 241                 return 0;
 242
 243         if (sregs->u.e.features & KVM_SREGS_E_PM) {
 244                 vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] =
 245                         sregs->u.e.ivor_high[3];
 246         }
 247
 248         if (sregs->u.e.features & KVM_SREGS_E_PC) {
 249                 vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL] =
 250                         sregs->u.e.ivor_high[4];
 251                 vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT] =
 252                         sregs->u.e.ivor_high[5];
 253         }
 254
 255         return kvmppc_set_sregs_ivor(vcpu, sregs);
 256 }
 257
 258 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
 259 {
 260         struct kvmppc_vcpu_e500 *vcpu_e500;
 261         struct kvm_vcpu *vcpu;
 262         int err;
 263
 264         vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 265         if (!vcpu_e500) {
 266                 err = -ENOMEM;
 267                 goto out;
 268         }
 269         vcpu = &vcpu_e500->vcpu;
 270
 271         /* Invalid PIR value -- this LPID dosn't have valid state on any cpu */
 272         vcpu->arch.oldpir = 0xffffffff;
 273
 274         err = kvm_vcpu_init(vcpu, kvm, id);
 275         if (err)
 276                 goto free_vcpu;
 277
 278         err = kvmppc_e500_tlb_init(vcpu_e500);
 279         if (err)
 280                 goto uninit_vcpu;
 281
 282         vcpu->arch.shared = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
 283         if (!vcpu->arch.shared)
 284                 goto uninit_tlb;
 285
 286         return vcpu;
 287
 288 uninit_tlb:
 289         kvmppc_e500_tlb_uninit(vcpu_e500);
 290 uninit_vcpu:
 291         kvm_vcpu_uninit(vcpu);
 292
 293 free_vcpu:
 294         kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
 295 out:
 296         return ERR_PTR(err);
 297 }
 298
 299 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
 300 {
 301         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 302
 303         free_page((unsigned long)vcpu->arch.shared);
 304         kvmppc_e500_tlb_uninit(vcpu_e500);
 305         kvm_vcpu_uninit(vcpu);
 306         kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
 307 }
 308
 309 int kvmppc_core_init_vm(struct kvm *kvm)
 310 {
 311         int lpid;
 312
 313         lpid = kvmppc_alloc_lpid();
 314         if (lpid < 0)
 315                 return lpid;
 316
 317         kvm->arch.lpid = lpid;
 318         return 0;
 319 }
 320
 321 void kvmppc_core_destroy_vm(struct kvm *kvm)
 322 {
 323         kvmppc_free_lpid(kvm->arch.lpid);
 324 }
 325
 326 static int __init kvmppc_e500mc_init(void)
 327 {
 328         int r;
 329
 330         r = kvmppc_booke_init();
 331         if (r)
 332                 return r;
 333
 334         kvmppc_init_lpid(64);
 335         kvmppc_claim_lpid(0); /* host */
 336
 337         return kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
 338 }
 339
 340 static void __exit kvmppc_e500mc_exit(void)
 341 {
 342         kvmppc_booke_exit();
 343 }
 344
 345 module_init(kvmppc_e500mc_init);
 346 module_exit(kvmppc_e500mc_exit);