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 #include <linux/miscdevice.h>
  20 #include <linux/module.h>
  21
  22 #include <asm/reg.h>
  23 #include <asm/cputable.h>
  24 #include <asm/tlbflush.h>
  25 #include <asm/kvm_ppc.h>
  26 #include <asm/dbell.h>
  27
  28 #include "booke.h"
  29 #include "e500.h"
  30
  31 void kvmppc_set_pending_interrupt(struct kvm_vcpu *vcpu, enum int_class type)
  32 {
  33         enum ppc_dbell dbell_type;
  34         unsigned long tag;
  35
  36         switch (type) {
  37         case INT_CLASS_NONCRIT:
  38                 dbell_type = PPC_G_DBELL;
  39                 break;
  40         case INT_CLASS_CRIT:
  41                 dbell_type = PPC_G_DBELL_CRIT;
  42                 break;
  43         case INT_CLASS_MC:
  44                 dbell_type = PPC_G_DBELL_MC;
  45                 break;
  46         default:
  47                 WARN_ONCE(1, "%s: unknown int type %d\n", __func__, type);
  48                 return;
  49         }
  50
  51         preempt_disable();
  52         tag = PPC_DBELL_LPID(get_lpid(vcpu)) | vcpu->vcpu_id;
  53         mb();
  54         ppc_msgsnd(dbell_type, 0, tag);
  55         preempt_enable();
  56 }
  57
  58 /* gtlbe must not be mapped by more than one host tlb entry */
  59 void kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 *vcpu_e500,
  60                            struct kvm_book3e_206_tlb_entry *gtlbe)
  61 {
  62         unsigned int tid, ts;
  63         gva_t eaddr;
  64         u32 val;
  65         unsigned long flags;
  66
  67         ts = get_tlb_ts(gtlbe);
  68         tid = get_tlb_tid(gtlbe);
  69
  70         /* We search the host TLB to invalidate its shadow TLB entry */
  71         val = (tid << 16) | ts;
  72         eaddr = get_tlb_eaddr(gtlbe);
  73
  74         local_irq_save(flags);
  75
  76         mtspr(SPRN_MAS6, val);
  77         mtspr(SPRN_MAS5, MAS5_SGS | get_lpid(&vcpu_e500->vcpu));
  78
  79         asm volatile("tlbsx 0, %[eaddr]\n" : : [eaddr] "r" (eaddr));
  80         val = mfspr(SPRN_MAS1);
  81         if (val & MAS1_VALID) {
  82                 mtspr(SPRN_MAS1, val & ~MAS1_VALID);
  83                 asm volatile("tlbwe");
  84         }
  85         mtspr(SPRN_MAS5, 0);
  86         /* NOTE: tlbsx also updates mas8, so clear it for host tlbwe */
  87         mtspr(SPRN_MAS8, 0);
  88         isync();
  89
  90         local_irq_restore(flags);
  91 }
  92
  93 void kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 *vcpu_e500)
  94 {
  95         unsigned long flags;
  96
  97         local_irq_save(flags);
  98         mtspr(SPRN_MAS5, MAS5_SGS | get_lpid(&vcpu_e500->vcpu));
  99         asm volatile("tlbilxlpid");
 100         mtspr(SPRN_MAS5, 0);
 101         local_irq_restore(flags);
 102 }
 103
 104 void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid)
 105 {
 106         vcpu->arch.pid = pid;
 107 }
 108
 109 void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr)
 110 {
 111 }
 112
 113 /* We use two lpids per VM */
 114 static DEFINE_PER_CPU(struct kvm_vcpu *[KVMPPC_NR_LPIDS], last_vcpu_of_lpid);
 115
 116 static void kvmppc_core_vcpu_load_e500mc(struct kvm_vcpu *vcpu, int cpu)
 117 {
 118         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 119
 120         kvmppc_booke_vcpu_load(vcpu, cpu);
 121
 122         mtspr(SPRN_LPID, get_lpid(vcpu));
 123         mtspr(SPRN_EPCR, vcpu->arch.shadow_epcr);
 124         mtspr(SPRN_GPIR, vcpu->vcpu_id);
 125         mtspr(SPRN_MSRP, vcpu->arch.shadow_msrp);
 126         vcpu->arch.eplc = EPC_EGS | (get_lpid(vcpu) << EPC_ELPID_SHIFT);
 127         vcpu->arch.epsc = vcpu->arch.eplc;
 128         mtspr(SPRN_EPLC, vcpu->arch.eplc);
 129         mtspr(SPRN_EPSC, vcpu->arch.epsc);
 130
 131         mtspr(SPRN_GIVPR, vcpu->arch.ivpr);
 132         mtspr(SPRN_GIVOR2, vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE]);
 133         mtspr(SPRN_GIVOR8, vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL]);
 134         mtspr(SPRN_GSPRG0, (unsigned long)vcpu->arch.shared->sprg0);
 135         mtspr(SPRN_GSPRG1, (unsigned long)vcpu->arch.shared->sprg1);
 136         mtspr(SPRN_GSPRG2, (unsigned long)vcpu->arch.shared->sprg2);
 137         mtspr(SPRN_GSPRG3, (unsigned long)vcpu->arch.shared->sprg3);
 138
 139         mtspr(SPRN_GSRR0, vcpu->arch.shared->srr0);
 140         mtspr(SPRN_GSRR1, vcpu->arch.shared->srr1);
 141
 142         mtspr(SPRN_GEPR, vcpu->arch.epr);
 143         mtspr(SPRN_GDEAR, vcpu->arch.shared->dar);
 144         mtspr(SPRN_GESR, vcpu->arch.shared->esr);
 145
 146         if (vcpu->arch.oldpir != mfspr(SPRN_PIR) ||
 147             __this_cpu_read(last_vcpu_of_lpid[get_lpid(vcpu)]) != vcpu) {
 148                 kvmppc_e500_tlbil_all(vcpu_e500);
 149                 __this_cpu_write(last_vcpu_of_lpid[get_lpid(vcpu)], vcpu);
 150         }
 151 }
 152
 153 static void kvmppc_core_vcpu_put_e500mc(struct kvm_vcpu *vcpu)
 154 {
 155         vcpu->arch.eplc = mfspr(SPRN_EPLC);
 156         vcpu->arch.epsc = mfspr(SPRN_EPSC);
 157
 158         vcpu->arch.shared->sprg0 = mfspr(SPRN_GSPRG0);
 159         vcpu->arch.shared->sprg1 = mfspr(SPRN_GSPRG1);
 160         vcpu->arch.shared->sprg2 = mfspr(SPRN_GSPRG2);
 161         vcpu->arch.shared->sprg3 = mfspr(SPRN_GSPRG3);
 162
 163         vcpu->arch.shared->srr0 = mfspr(SPRN_GSRR0);
 164         vcpu->arch.shared->srr1 = mfspr(SPRN_GSRR1);
 165
 166         vcpu->arch.epr = mfspr(SPRN_GEPR);
 167         vcpu->arch.shared->dar = mfspr(SPRN_GDEAR);
 168         vcpu->arch.shared->esr = mfspr(SPRN_GESR);
 169
 170         vcpu->arch.oldpir = mfspr(SPRN_PIR);
 171
 172         kvmppc_booke_vcpu_put(vcpu);
 173 }
 174
 175 int kvmppc_core_check_processor_compat(void)
 176 {
 177         int r;
 178
 179         if (strcmp(cur_cpu_spec->cpu_name, "e500mc") == 0)
 180                 r = 0;
 181         else if (strcmp(cur_cpu_spec->cpu_name, "e5500") == 0)
 182                 r = 0;
 183 #ifdef CONFIG_ALTIVEC
 184         /*
 185          * Since guests have the priviledge to enable AltiVec, we need AltiVec
 186          * support in the host to save/restore their context.
 187          * Don't use CPU_FTR_ALTIVEC to identify cores with AltiVec unit
 188          * because it's cleared in the absence of CONFIG_ALTIVEC!
 189          */
 190         else if (strcmp(cur_cpu_spec->cpu_name, "e6500") == 0)
 191                 r = 0;
 192 #endif
 193         else
 194                 r = -ENOTSUPP;
 195
 196         return r;
 197 }
 198
 199 int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
 200 {
 201         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 202
 203         vcpu->arch.shadow_epcr = SPRN_EPCR_DSIGS | SPRN_EPCR_DGTMI | \
 204                                  SPRN_EPCR_DUVD;
 205 #ifdef CONFIG_64BIT
 206         vcpu->arch.shadow_epcr |= SPRN_EPCR_ICM;
 207 #endif
 208         vcpu->arch.shadow_msrp = MSRP_UCLEP | MSRP_PMMP;
 209
 210         vcpu->arch.pvr = mfspr(SPRN_PVR);
 211         vcpu_e500->svr = mfspr(SPRN_SVR);
 212
 213         vcpu->arch.cpu_type = KVM_CPU_E500MC;
 214
 215         return 0;
 216 }
 217
 218 static int kvmppc_core_get_sregs_e500mc(struct kvm_vcpu *vcpu,
 219                                         struct kvm_sregs *sregs)
 220 {
 221         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 222
 223         sregs->u.e.features |= KVM_SREGS_E_ARCH206_MMU | KVM_SREGS_E_PM |
 224                                KVM_SREGS_E_PC;
 225         sregs->u.e.impl_id = KVM_SREGS_E_IMPL_FSL;
 226
 227         sregs->u.e.impl.fsl.features = 0;
 228         sregs->u.e.impl.fsl.svr = vcpu_e500->svr;
 229         sregs->u.e.impl.fsl.hid0 = vcpu_e500->hid0;
 230         sregs->u.e.impl.fsl.mcar = vcpu_e500->mcar;
 231
 232         kvmppc_get_sregs_e500_tlb(vcpu, sregs);
 233
 234         sregs->u.e.ivor_high[3] =
 235                 vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
 236         sregs->u.e.ivor_high[4] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL];
 237         sregs->u.e.ivor_high[5] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT];
 238
 239         return kvmppc_get_sregs_ivor(vcpu, sregs);
 240 }
 241
 242 static int kvmppc_core_set_sregs_e500mc(struct kvm_vcpu *vcpu,
 243                                         struct kvm_sregs *sregs)
 244 {
 245         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 246         int ret;
 247
 248         if (sregs->u.e.impl_id == KVM_SREGS_E_IMPL_FSL) {
 249                 vcpu_e500->svr = sregs->u.e.impl.fsl.svr;
 250                 vcpu_e500->hid0 = sregs->u.e.impl.fsl.hid0;
 251                 vcpu_e500->mcar = sregs->u.e.impl.fsl.mcar;
 252         }
 253
 254         ret = kvmppc_set_sregs_e500_tlb(vcpu, sregs);
 255         if (ret < 0)
 256                 return ret;
 257
 258         if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
 259                 return 0;
 260
 261         if (sregs->u.e.features & KVM_SREGS_E_PM) {
 262                 vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] =
 263                         sregs->u.e.ivor_high[3];
 264         }
 265
 266         if (sregs->u.e.features & KVM_SREGS_E_PC) {
 267                 vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL] =
 268                         sregs->u.e.ivor_high[4];
 269                 vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT] =
 270                         sregs->u.e.ivor_high[5];
 271         }
 272
 273         return kvmppc_set_sregs_ivor(vcpu, sregs);
 274 }
 275
 276 static int kvmppc_get_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
 277                               union kvmppc_one_reg *val)
 278 {
 279         int r = 0;
 280
 281         switch (id) {
 282         case KVM_REG_PPC_SPRG9:
 283                 *val = get_reg_val(id, vcpu->arch.sprg9);
 284                 break;
 285         default:
 286                 r = kvmppc_get_one_reg_e500_tlb(vcpu, id, val);
 287         }
 288
 289         return r;
 290 }
 291
 292 static int kvmppc_set_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
 293                               union kvmppc_one_reg *val)
 294 {
 295         int r = 0;
 296
 297         switch (id) {
 298         case KVM_REG_PPC_SPRG9:
 299                 vcpu->arch.sprg9 = set_reg_val(id, *val);
 300                 break;
 301         default:
 302                 r = kvmppc_set_one_reg_e500_tlb(vcpu, id, val);
 303         }
 304
 305         return r;
 306 }
 307
 308 static struct kvm_vcpu *kvmppc_core_vcpu_create_e500mc(struct kvm *kvm,
 309                                                        unsigned int id)
 310 {
 311         struct kvmppc_vcpu_e500 *vcpu_e500;
 312         struct kvm_vcpu *vcpu;
 313         int err;
 314
 315         vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 316         if (!vcpu_e500) {
 317                 err = -ENOMEM;
 318                 goto out;
 319         }
 320         vcpu = &vcpu_e500->vcpu;
 321
 322         /* Invalid PIR value -- this LPID dosn't have valid state on any cpu */
 323         vcpu->arch.oldpir = 0xffffffff;
 324
 325         err = kvm_vcpu_init(vcpu, kvm, id);
 326         if (err)
 327                 goto free_vcpu;
 328
 329         err = kvmppc_e500_tlb_init(vcpu_e500);
 330         if (err)
 331                 goto uninit_vcpu;
 332
 333         vcpu->arch.shared = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
 334         if (!vcpu->arch.shared)
 335                 goto uninit_tlb;
 336
 337         return vcpu;
 338
 339 uninit_tlb:
 340         kvmppc_e500_tlb_uninit(vcpu_e500);
 341 uninit_vcpu:
 342         kvm_vcpu_uninit(vcpu);
 343
 344 free_vcpu:
 345         kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
 346 out:
 347         return ERR_PTR(err);
 348 }
 349
 350 static void kvmppc_core_vcpu_free_e500mc(struct kvm_vcpu *vcpu)
 351 {
 352         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 353
 354         free_page((unsigned long)vcpu->arch.shared);
 355         kvmppc_e500_tlb_uninit(vcpu_e500);
 356         kvm_vcpu_uninit(vcpu);
 357         kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
 358 }
 359
 360 static int kvmppc_core_init_vm_e500mc(struct kvm *kvm)
 361 {
 362         int lpid;
 363
 364         lpid = kvmppc_alloc_lpid();
 365         if (lpid < 0)
 366                 return lpid;
 367
 368         /*
 369          * Use two lpids per VM on cores with two threads like e6500. Use
 370          * even numbers to speedup vcpu lpid computation with consecutive lpids
 371          * per VM. vm1 will use lpids 2 and 3, vm2 lpids 4 and 5, and so on.
 372          */
 373         if (threads_per_core == 2)
 374                 lpid <<= 1;
 375
 376         kvm->arch.lpid = lpid;
 377         return 0;
 378 }
 379
 380 static void kvmppc_core_destroy_vm_e500mc(struct kvm *kvm)
 381 {
 382         int lpid = kvm->arch.lpid;
 383
 384         if (threads_per_core == 2)
 385                 lpid >>= 1;
 386
 387         kvmppc_free_lpid(lpid);
 388 }
 389
 390 static struct kvmppc_ops kvm_ops_e500mc = {
 391         .get_sregs = kvmppc_core_get_sregs_e500mc,
 392         .set_sregs = kvmppc_core_set_sregs_e500mc,
 393         .get_one_reg = kvmppc_get_one_reg_e500mc,
 394         .set_one_reg = kvmppc_set_one_reg_e500mc,
 395         .vcpu_load   = kvmppc_core_vcpu_load_e500mc,
 396         .vcpu_put    = kvmppc_core_vcpu_put_e500mc,
 397         .vcpu_create = kvmppc_core_vcpu_create_e500mc,
 398         .vcpu_free   = kvmppc_core_vcpu_free_e500mc,
 399         .mmu_destroy  = kvmppc_mmu_destroy_e500,
 400         .init_vm = kvmppc_core_init_vm_e500mc,
 401         .destroy_vm = kvmppc_core_destroy_vm_e500mc,
 402         .emulate_op = kvmppc_core_emulate_op_e500,
 403         .emulate_mtspr = kvmppc_core_emulate_mtspr_e500,
 404         .emulate_mfspr = kvmppc_core_emulate_mfspr_e500,
 405 };
 406
 407 static int __init kvmppc_e500mc_init(void)
 408 {
 409         int r;
 410
 411         r = kvmppc_booke_init();
 412         if (r)
 413                 goto err_out;
 414
 415         /*
 416          * Use two lpids per VM on dual threaded processors like e6500
 417          * to workarround the lack of tlb write conditional instruction.
 418          * Expose half the number of available hardware lpids to the lpid
 419          * allocator.
 420          */
 421         kvmppc_init_lpid(KVMPPC_NR_LPIDS/threads_per_core);
 422         kvmppc_claim_lpid(0); /* host */
 423
 424         r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
 425         if (r)
 426                 goto err_out;
 427         kvm_ops_e500mc.owner = THIS_MODULE;
 428         kvmppc_pr_ops = &kvm_ops_e500mc;
 429
 430 err_out:
 431         return r;
 432 }
 433
 434 static void __exit kvmppc_e500mc_exit(void)
 435 {
 436         kvmppc_pr_ops = NULL;
 437         kvmppc_booke_exit();
 438 }
 439
 440 module_init(kvmppc_e500mc_init);
 441 module_exit(kvmppc_e500mc_exit);
 442 MODULE_ALIAS_MISCDEV(KVM_MINOR);
 443 MODULE_ALIAS("devname:kvm");