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
  52         tag = PPC_DBELL_LPID(vcpu->kvm->arch.lpid) | vcpu->vcpu_id;
  53         mb();
  54         ppc_msgsnd(dbell_type, 0, tag);
  55 }
  56
  57 /* gtlbe must not be mapped by more than one host tlb entry */
  58 void kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 *vcpu_e500,
  59                            struct kvm_book3e_206_tlb_entry *gtlbe)
  60 {
  61         unsigned int tid, ts;
  62         gva_t eaddr;
  63         u32 val, lpid;
  64         unsigned long flags;
  65
  66         ts = get_tlb_ts(gtlbe);
  67         tid = get_tlb_tid(gtlbe);
  68         lpid = vcpu_e500->vcpu.kvm->arch.lpid;
  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 | lpid);
  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 | vcpu_e500->vcpu.kvm->arch.lpid);
  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 static DEFINE_PER_CPU(struct kvm_vcpu *[KVMPPC_NR_LPIDS], last_vcpu_of_lpid);
 114
 115 static void kvmppc_core_vcpu_load_e500mc(struct kvm_vcpu *vcpu, int cpu)
 116 {
 117         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 118
 119         kvmppc_booke_vcpu_load(vcpu, cpu);
 120
 121         mtspr(SPRN_LPID, vcpu->kvm->arch.lpid);
 122         mtspr(SPRN_EPCR, vcpu->arch.shadow_epcr);
 123         mtspr(SPRN_GPIR, vcpu->vcpu_id);
 124         mtspr(SPRN_MSRP, vcpu->arch.shadow_msrp);
 125         mtspr(SPRN_EPLC, vcpu->arch.eplc);
 126         mtspr(SPRN_EPSC, vcpu->arch.epsc);
 127
 128         mtspr(SPRN_GIVPR, vcpu->arch.ivpr);
 129         mtspr(SPRN_GIVOR2, vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE]);
 130         mtspr(SPRN_GIVOR8, vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL]);
 131         mtspr(SPRN_GSPRG0, (unsigned long)vcpu->arch.shared->sprg0);
 132         mtspr(SPRN_GSPRG1, (unsigned long)vcpu->arch.shared->sprg1);
 133         mtspr(SPRN_GSPRG2, (unsigned long)vcpu->arch.shared->sprg2);
 134         mtspr(SPRN_GSPRG3, (unsigned long)vcpu->arch.shared->sprg3);
 135
 136         mtspr(SPRN_GSRR0, vcpu->arch.shared->srr0);
 137         mtspr(SPRN_GSRR1, vcpu->arch.shared->srr1);
 138
 139         mtspr(SPRN_GEPR, vcpu->arch.epr);
 140         mtspr(SPRN_GDEAR, vcpu->arch.shared->dar);
 141         mtspr(SPRN_GESR, vcpu->arch.shared->esr);
 142
 143         if (vcpu->arch.oldpir != mfspr(SPRN_PIR) ||
 144             __get_cpu_var(last_vcpu_of_lpid)[vcpu->kvm->arch.lpid] != vcpu) {
 145                 kvmppc_e500_tlbil_all(vcpu_e500);
 146                 __get_cpu_var(last_vcpu_of_lpid)[vcpu->kvm->arch.lpid] = vcpu;
 147         }
 148
 149         kvmppc_load_guest_fp(vcpu);
 150 }
 151
 152 static void kvmppc_core_vcpu_put_e500mc(struct kvm_vcpu *vcpu)
 153 {
 154         vcpu->arch.eplc = mfspr(SPRN_EPLC);
 155         vcpu->arch.epsc = mfspr(SPRN_EPSC);
 156
 157         vcpu->arch.shared->sprg0 = mfspr(SPRN_GSPRG0);
 158         vcpu->arch.shared->sprg1 = mfspr(SPRN_GSPRG1);
 159         vcpu->arch.shared->sprg2 = mfspr(SPRN_GSPRG2);
 160         vcpu->arch.shared->sprg3 = mfspr(SPRN_GSPRG3);
 161
 162         vcpu->arch.shared->srr0 = mfspr(SPRN_GSRR0);
 163         vcpu->arch.shared->srr1 = mfspr(SPRN_GSRR1);
 164
 165         vcpu->arch.epr = mfspr(SPRN_GEPR);
 166         vcpu->arch.shared->dar = mfspr(SPRN_GDEAR);
 167         vcpu->arch.shared->esr = mfspr(SPRN_GESR);
 168
 169         vcpu->arch.oldpir = mfspr(SPRN_PIR);
 170
 171         kvmppc_booke_vcpu_put(vcpu);
 172 }
 173
 174 int kvmppc_core_check_processor_compat(void)
 175 {
 176         int r;
 177
 178         if (strcmp(cur_cpu_spec->cpu_name, "e500mc") == 0)
 179                 r = 0;
 180         else if (strcmp(cur_cpu_spec->cpu_name, "e5500") == 0)
 181                 r = 0;
 182         else
 183                 r = -ENOTSUPP;
 184
 185         return r;
 186 }
 187
 188 int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
 189 {
 190         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 191
 192         vcpu->arch.shadow_epcr = SPRN_EPCR_DSIGS | SPRN_EPCR_DGTMI | \
 193                                  SPRN_EPCR_DUVD;
 194 #ifdef CONFIG_64BIT
 195         vcpu->arch.shadow_epcr |= SPRN_EPCR_ICM;
 196 #endif
 197         vcpu->arch.shadow_msrp = MSRP_UCLEP | MSRP_DEP | MSRP_PMMP;
 198         vcpu->arch.eplc = EPC_EGS | (vcpu->kvm->arch.lpid << EPC_ELPID_SHIFT);
 199         vcpu->arch.epsc = vcpu->arch.eplc;
 200
 201         vcpu->arch.pvr = mfspr(SPRN_PVR);
 202         vcpu_e500->svr = mfspr(SPRN_SVR);
 203
 204         vcpu->arch.cpu_type = KVM_CPU_E500MC;
 205
 206         return 0;
 207 }
 208
 209 static int kvmppc_core_get_sregs_e500mc(struct kvm_vcpu *vcpu,
 210                                         struct kvm_sregs *sregs)
 211 {
 212         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 213
 214         sregs->u.e.features |= KVM_SREGS_E_ARCH206_MMU | KVM_SREGS_E_PM |
 215                                KVM_SREGS_E_PC;
 216         sregs->u.e.impl_id = KVM_SREGS_E_IMPL_FSL;
 217
 218         sregs->u.e.impl.fsl.features = 0;
 219         sregs->u.e.impl.fsl.svr = vcpu_e500->svr;
 220         sregs->u.e.impl.fsl.hid0 = vcpu_e500->hid0;
 221         sregs->u.e.impl.fsl.mcar = vcpu_e500->mcar;
 222
 223         kvmppc_get_sregs_e500_tlb(vcpu, sregs);
 224
 225         sregs->u.e.ivor_high[3] =
 226                 vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
 227         sregs->u.e.ivor_high[4] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL];
 228         sregs->u.e.ivor_high[5] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT];
 229
 230         return kvmppc_get_sregs_ivor(vcpu, sregs);
 231 }
 232
 233 static int kvmppc_core_set_sregs_e500mc(struct kvm_vcpu *vcpu,
 234                                         struct kvm_sregs *sregs)
 235 {
 236         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 237         int ret;
 238
 239         if (sregs->u.e.impl_id == KVM_SREGS_E_IMPL_FSL) {
 240                 vcpu_e500->svr = sregs->u.e.impl.fsl.svr;
 241                 vcpu_e500->hid0 = sregs->u.e.impl.fsl.hid0;
 242                 vcpu_e500->mcar = sregs->u.e.impl.fsl.mcar;
 243         }
 244
 245         ret = kvmppc_set_sregs_e500_tlb(vcpu, sregs);
 246         if (ret < 0)
 247                 return ret;
 248
 249         if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
 250                 return 0;
 251
 252         if (sregs->u.e.features & KVM_SREGS_E_PM) {
 253                 vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] =
 254                         sregs->u.e.ivor_high[3];
 255         }
 256
 257         if (sregs->u.e.features & KVM_SREGS_E_PC) {
 258                 vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL] =
 259                         sregs->u.e.ivor_high[4];
 260                 vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT] =
 261                         sregs->u.e.ivor_high[5];
 262         }
 263
 264         return kvmppc_set_sregs_ivor(vcpu, sregs);
 265 }
 266
 267 static int kvmppc_get_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
 268                               union kvmppc_one_reg *val)
 269 {
 270         int r = 0;
 271
 272         switch (id) {
 273         case KVM_REG_PPC_SPRG9:
 274                 *val = get_reg_val(id, vcpu->arch.sprg9);
 275                 break;
 276         default:
 277                 r = kvmppc_get_one_reg_e500_tlb(vcpu, id, val);
 278         }
 279
 280         return r;
 281 }
 282
 283 static int kvmppc_set_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
 284                               union kvmppc_one_reg *val)
 285 {
 286         int r = 0;
 287
 288         switch (id) {
 289         case KVM_REG_PPC_SPRG9:
 290                 vcpu->arch.sprg9 = set_reg_val(id, *val);
 291                 break;
 292         default:
 293                 r = kvmppc_set_one_reg_e500_tlb(vcpu, id, val);
 294         }
 295
 296         return r;
 297 }
 298
 299 static struct kvm_vcpu *kvmppc_core_vcpu_create_e500mc(struct kvm *kvm,
 300                                                        unsigned int id)
 301 {
 302         struct kvmppc_vcpu_e500 *vcpu_e500;
 303         struct kvm_vcpu *vcpu;
 304         int err;
 305
 306         vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 307         if (!vcpu_e500) {
 308                 err = -ENOMEM;
 309                 goto out;
 310         }
 311         vcpu = &vcpu_e500->vcpu;
 312
 313         /* Invalid PIR value -- this LPID dosn't have valid state on any cpu */
 314         vcpu->arch.oldpir = 0xffffffff;
 315
 316         err = kvm_vcpu_init(vcpu, kvm, id);
 317         if (err)
 318                 goto free_vcpu;
 319
 320         err = kvmppc_e500_tlb_init(vcpu_e500);
 321         if (err)
 322                 goto uninit_vcpu;
 323
 324         vcpu->arch.shared = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
 325         if (!vcpu->arch.shared)
 326                 goto uninit_tlb;
 327
 328         return vcpu;
 329
 330 uninit_tlb:
 331         kvmppc_e500_tlb_uninit(vcpu_e500);
 332 uninit_vcpu:
 333         kvm_vcpu_uninit(vcpu);
 334
 335 free_vcpu:
 336         kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
 337 out:
 338         return ERR_PTR(err);
 339 }
 340
 341 static void kvmppc_core_vcpu_free_e500mc(struct kvm_vcpu *vcpu)
 342 {
 343         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 344
 345         free_page((unsigned long)vcpu->arch.shared);
 346         kvmppc_e500_tlb_uninit(vcpu_e500);
 347         kvm_vcpu_uninit(vcpu);
 348         kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
 349 }
 350
 351 static int kvmppc_core_init_vm_e500mc(struct kvm *kvm)
 352 {
 353         int lpid;
 354
 355         lpid = kvmppc_alloc_lpid();
 356         if (lpid < 0)
 357                 return lpid;
 358
 359         kvm->arch.lpid = lpid;
 360         return 0;
 361 }
 362
 363 static void kvmppc_core_destroy_vm_e500mc(struct kvm *kvm)
 364 {
 365         kvmppc_free_lpid(kvm->arch.lpid);
 366 }
 367
 368 static struct kvmppc_ops kvm_ops_e500mc = {
 369         .get_sregs = kvmppc_core_get_sregs_e500mc,
 370         .set_sregs = kvmppc_core_set_sregs_e500mc,
 371         .get_one_reg = kvmppc_get_one_reg_e500mc,
 372         .set_one_reg = kvmppc_set_one_reg_e500mc,
 373         .vcpu_load   = kvmppc_core_vcpu_load_e500mc,
 374         .vcpu_put    = kvmppc_core_vcpu_put_e500mc,
 375         .vcpu_create = kvmppc_core_vcpu_create_e500mc,
 376         .vcpu_free   = kvmppc_core_vcpu_free_e500mc,
 377         .mmu_destroy  = kvmppc_mmu_destroy_e500,
 378         .init_vm = kvmppc_core_init_vm_e500mc,
 379         .destroy_vm = kvmppc_core_destroy_vm_e500mc,
 380         .emulate_op = kvmppc_core_emulate_op_e500,
 381         .emulate_mtspr = kvmppc_core_emulate_mtspr_e500,
 382         .emulate_mfspr = kvmppc_core_emulate_mfspr_e500,
 383 };
 384
 385 static int __init kvmppc_e500mc_init(void)
 386 {
 387         int r;
 388
 389         r = kvmppc_booke_init();
 390         if (r)
 391                 goto err_out;
 392
 393         kvmppc_init_lpid(64);
 394         kvmppc_claim_lpid(0); /* host */
 395
 396         r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
 397         if (r)
 398                 goto err_out;
 399         kvm_ops_e500mc.owner = THIS_MODULE;
 400         kvmppc_pr_ops = &kvm_ops_e500mc;
 401
 402 err_out:
 403         return r;
 404 }
 405
 406 static void __exit kvmppc_e500mc_exit(void)
 407 {
 408         kvmppc_pr_ops = NULL;
 409         kvmppc_booke_exit();
 410 }
 411
 412 module_init(kvmppc_e500mc_init);
 413 module_exit(kvmppc_e500mc_exit);
 414 MODULE_ALIAS_MISCDEV(KVM_MINOR);
 415 MODULE_ALIAS("devname:kvm");