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 static DEFINE_PER_CPU(struct kvm_vcpu *, last_vcpu_on_cpu);
 112
 113 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 114 {
 115         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 116
 117         kvmppc_booke_vcpu_load(vcpu, cpu);
 118
 119         mtspr(SPRN_LPID, vcpu->kvm->arch.lpid);
 120         mtspr(SPRN_EPCR, vcpu->arch.shadow_epcr);
 121         mtspr(SPRN_GPIR, vcpu->vcpu_id);
 122         mtspr(SPRN_MSRP, vcpu->arch.shadow_msrp);
 123         mtspr(SPRN_EPLC, vcpu->arch.eplc);
 124         mtspr(SPRN_EPSC, vcpu->arch.epsc);
 125
 126         mtspr(SPRN_GIVPR, vcpu->arch.ivpr);
 127         mtspr(SPRN_GIVOR2, vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE]);
 128         mtspr(SPRN_GIVOR8, vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL]);
 129         mtspr(SPRN_GSPRG0, (unsigned long)vcpu->arch.shared->sprg0);
 130         mtspr(SPRN_GSPRG1, (unsigned long)vcpu->arch.shared->sprg1);
 131         mtspr(SPRN_GSPRG2, (unsigned long)vcpu->arch.shared->sprg2);
 132         mtspr(SPRN_GSPRG3, (unsigned long)vcpu->arch.shared->sprg3);
 133
 134         mtspr(SPRN_GSRR0, vcpu->arch.shared->srr0);
 135         mtspr(SPRN_GSRR1, vcpu->arch.shared->srr1);
 136
 137         mtspr(SPRN_GEPR, vcpu->arch.epr);
 138         mtspr(SPRN_GDEAR, vcpu->arch.shared->dar);
 139         mtspr(SPRN_GESR, vcpu->arch.shared->esr);
 140
 141         if (vcpu->arch.oldpir != mfspr(SPRN_PIR) ||
 142             __get_cpu_var(last_vcpu_on_cpu) != vcpu) {
 143                 kvmppc_e500_tlbil_all(vcpu_e500);
 144                 __get_cpu_var(last_vcpu_on_cpu) = vcpu;
 145         }
 146
 147         kvmppc_load_guest_fp(vcpu);
 148 }
 149
 150 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
 151 {
 152         vcpu->arch.eplc = mfspr(SPRN_EPLC);
 153         vcpu->arch.epsc = mfspr(SPRN_EPSC);
 154
 155         vcpu->arch.shared->sprg0 = mfspr(SPRN_GSPRG0);
 156         vcpu->arch.shared->sprg1 = mfspr(SPRN_GSPRG1);
 157         vcpu->arch.shared->sprg2 = mfspr(SPRN_GSPRG2);
 158         vcpu->arch.shared->sprg3 = mfspr(SPRN_GSPRG3);
 159
 160         vcpu->arch.shared->srr0 = mfspr(SPRN_GSRR0);
 161         vcpu->arch.shared->srr1 = mfspr(SPRN_GSRR1);
 162
 163         vcpu->arch.epr = mfspr(SPRN_GEPR);
 164         vcpu->arch.shared->dar = mfspr(SPRN_GDEAR);
 165         vcpu->arch.shared->esr = mfspr(SPRN_GESR);
 166
 167         vcpu->arch.oldpir = mfspr(SPRN_PIR);
 168
 169         kvmppc_booke_vcpu_put(vcpu);
 170 }
 171
 172 int kvmppc_core_check_processor_compat(void)
 173 {
 174         int r;
 175
 176         if (strcmp(cur_cpu_spec->cpu_name, "e500mc") == 0)
 177                 r = 0;
 178         else if (strcmp(cur_cpu_spec->cpu_name, "e5500") == 0)
 179                 r = 0;
 180         else
 181                 r = -ENOTSUPP;
 182
 183         return r;
 184 }
 185
 186 int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
 187 {
 188         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 189
 190         vcpu->arch.shadow_epcr = SPRN_EPCR_DSIGS | SPRN_EPCR_DGTMI | \
 191                                  SPRN_EPCR_DUVD;
 192 #ifdef CONFIG_64BIT
 193         vcpu->arch.shadow_epcr |= SPRN_EPCR_ICM;
 194 #endif
 195         vcpu->arch.shadow_msrp = MSRP_UCLEP | MSRP_DEP | MSRP_PMMP;
 196         vcpu->arch.eplc = EPC_EGS | (vcpu->kvm->arch.lpid << EPC_ELPID_SHIFT);
 197         vcpu->arch.epsc = vcpu->arch.eplc;
 198
 199         vcpu->arch.pvr = mfspr(SPRN_PVR);
 200         vcpu_e500->svr = mfspr(SPRN_SVR);
 201
 202         vcpu->arch.cpu_type = KVM_CPU_E500MC;
 203
 204         return 0;
 205 }
 206
 207 void kvmppc_core_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 208 {
 209         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 210
 211         sregs->u.e.features |= KVM_SREGS_E_ARCH206_MMU | KVM_SREGS_E_PM |
 212                                KVM_SREGS_E_PC;
 213         sregs->u.e.impl_id = KVM_SREGS_E_IMPL_FSL;
 214
 215         sregs->u.e.impl.fsl.features = 0;
 216         sregs->u.e.impl.fsl.svr = vcpu_e500->svr;
 217         sregs->u.e.impl.fsl.hid0 = vcpu_e500->hid0;
 218         sregs->u.e.impl.fsl.mcar = vcpu_e500->mcar;
 219
 220         kvmppc_get_sregs_e500_tlb(vcpu, sregs);
 221
 222         sregs->u.e.ivor_high[3] =
 223                 vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
 224         sregs->u.e.ivor_high[4] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL];
 225         sregs->u.e.ivor_high[5] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT];
 226
 227         kvmppc_get_sregs_ivor(vcpu, sregs);
 228 }
 229
 230 int kvmppc_core_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 231 {
 232         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 233         int ret;
 234
 235         if (sregs->u.e.impl_id == KVM_SREGS_E_IMPL_FSL) {
 236                 vcpu_e500->svr = sregs->u.e.impl.fsl.svr;
 237                 vcpu_e500->hid0 = sregs->u.e.impl.fsl.hid0;
 238                 vcpu_e500->mcar = sregs->u.e.impl.fsl.mcar;
 239         }
 240
 241         ret = kvmppc_set_sregs_e500_tlb(vcpu, sregs);
 242         if (ret < 0)
 243                 return ret;
 244
 245         if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
 246                 return 0;
 247
 248         if (sregs->u.e.features & KVM_SREGS_E_PM) {
 249                 vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] =
 250                         sregs->u.e.ivor_high[3];
 251         }
 252
 253         if (sregs->u.e.features & KVM_SREGS_E_PC) {
 254                 vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL] =
 255                         sregs->u.e.ivor_high[4];
 256                 vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT] =
 257                         sregs->u.e.ivor_high[5];
 258         }
 259
 260         return kvmppc_set_sregs_ivor(vcpu, sregs);
 261 }
 262
 263 int kvmppc_get_one_reg(struct kvm_vcpu *vcpu, u64 id,
 264                         union kvmppc_one_reg *val)
 265 {
 266         int r = kvmppc_get_one_reg_e500_tlb(vcpu, id, val);
 267         return r;
 268 }
 269
 270 int kvmppc_set_one_reg(struct kvm_vcpu *vcpu, u64 id,
 271                        union kvmppc_one_reg *val)
 272 {
 273         int r = kvmppc_set_one_reg_e500_tlb(vcpu, id, val);
 274         return r;
 275 }
 276
 277 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
 278 {
 279         struct kvmppc_vcpu_e500 *vcpu_e500;
 280         struct kvm_vcpu *vcpu;
 281         int err;
 282
 283         vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 284         if (!vcpu_e500) {
 285                 err = -ENOMEM;
 286                 goto out;
 287         }
 288         vcpu = &vcpu_e500->vcpu;
 289
 290         /* Invalid PIR value -- this LPID dosn't have valid state on any cpu */
 291         vcpu->arch.oldpir = 0xffffffff;
 292
 293         err = kvm_vcpu_init(vcpu, kvm, id);
 294         if (err)
 295                 goto free_vcpu;
 296
 297         err = kvmppc_e500_tlb_init(vcpu_e500);
 298         if (err)
 299                 goto uninit_vcpu;
 300
 301         vcpu->arch.shared = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
 302         if (!vcpu->arch.shared)
 303                 goto uninit_tlb;
 304
 305         return vcpu;
 306
 307 uninit_tlb:
 308         kvmppc_e500_tlb_uninit(vcpu_e500);
 309 uninit_vcpu:
 310         kvm_vcpu_uninit(vcpu);
 311
 312 free_vcpu:
 313         kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
 314 out:
 315         return ERR_PTR(err);
 316 }
 317
 318 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
 319 {
 320         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 321
 322         free_page((unsigned long)vcpu->arch.shared);
 323         kvmppc_e500_tlb_uninit(vcpu_e500);
 324         kvm_vcpu_uninit(vcpu);
 325         kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
 326 }
 327
 328 int kvmppc_core_init_vm(struct kvm *kvm)
 329 {
 330         int lpid;
 331
 332         lpid = kvmppc_alloc_lpid();
 333         if (lpid < 0)
 334                 return lpid;
 335
 336         kvm->arch.lpid = lpid;
 337         return 0;
 338 }
 339
 340 void kvmppc_core_destroy_vm(struct kvm *kvm)
 341 {
 342         kvmppc_free_lpid(kvm->arch.lpid);
 343 }
 344
 345 static int __init kvmppc_e500mc_init(void)
 346 {
 347         int r;
 348
 349         r = kvmppc_booke_init();
 350         if (r)
 351                 return r;
 352
 353         kvmppc_init_lpid(64);
 354         kvmppc_claim_lpid(0); /* host */
 355
 356         return kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
 357 }
 358
 359 static void __exit kvmppc_e500mc_exit(void)
 360 {
 361         kvmppc_booke_exit();
 362 }
 363
 364 module_init(kvmppc_e500mc_init);
 365 module_exit(kvmppc_e500mc_exit);