arch/powerpc/kvm/e500mc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2010,2012 Freescale Semiconductor, Inc. All rights reserved.
   4  *
   5  * Author: Varun Sethi, <varun.sethi@freescale.com>
   6  *
   7  * Description:
   8  * This file is derived from arch/powerpc/kvm/e500.c,
   9  * by Yu Liu <yu.liu@freescale.com>.
  10  */
  11
  12 #include <linux/kvm_host.h>
  13 #include <linux/slab.h>
  14 #include <linux/err.h>
  15 #include <linux/export.h>
  16 #include <linux/miscdevice.h>
  17 #include <linux/module.h>
  18
  19 #include <asm/reg.h>
  20 #include <asm/cputable.h>
  21 #include <asm/kvm_ppc.h>
  22 #include <asm/dbell.h>
  23
  24 #include "booke.h"
  25 #include "e500.h"
  26
  27 void kvmppc_set_pending_interrupt(struct kvm_vcpu *vcpu, enum int_class type)
  28 {
  29         enum ppc_dbell dbell_type;
  30         unsigned long tag;
  31
  32         switch (type) {
  33         case INT_CLASS_NONCRIT:
  34                 dbell_type = PPC_G_DBELL;
  35                 break;
  36         case INT_CLASS_CRIT:
  37                 dbell_type = PPC_G_DBELL_CRIT;
  38                 break;
  39         case INT_CLASS_MC:
  40                 dbell_type = PPC_G_DBELL_MC;
  41                 break;
  42         default:
  43                 WARN_ONCE(1, "%s: unknown int type %d\n", __func__, type);
  44                 return;
  45         }
  46
  47         preempt_disable();
  48         tag = PPC_DBELL_LPID(get_lpid(vcpu)) | vcpu->vcpu_id;
  49         mb();
  50         ppc_msgsnd(dbell_type, 0, tag);
  51         preempt_enable();
  52 }
  53
  54 /* gtlbe must not be mapped by more than one host tlb entry */
  55 void kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 *vcpu_e500,
  56                            struct kvm_book3e_206_tlb_entry *gtlbe)
  57 {
  58         unsigned int tid, ts;
  59         gva_t eaddr;
  60         u32 val;
  61         unsigned long flags;
  62
  63         ts = get_tlb_ts(gtlbe);
  64         tid = get_tlb_tid(gtlbe);
  65
  66         /* We search the host TLB to invalidate its shadow TLB entry */
  67         val = (tid << 16) | ts;
  68         eaddr = get_tlb_eaddr(gtlbe);
  69
  70         local_irq_save(flags);
  71
  72         mtspr(SPRN_MAS6, val);
  73         mtspr(SPRN_MAS5, MAS5_SGS | get_lpid(&vcpu_e500->vcpu));
  74
  75         asm volatile("tlbsx 0, %[eaddr]\n" : : [eaddr] "r" (eaddr));
  76         val = mfspr(SPRN_MAS1);
  77         if (val & MAS1_VALID) {
  78                 mtspr(SPRN_MAS1, val & ~MAS1_VALID);
  79                 asm volatile("tlbwe");
  80         }
  81         mtspr(SPRN_MAS5, 0);
  82         /* NOTE: tlbsx also updates mas8, so clear it for host tlbwe */
  83         mtspr(SPRN_MAS8, 0);
  84         isync();
  85
  86         local_irq_restore(flags);
  87 }
  88
  89 void kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 *vcpu_e500)
  90 {
  91         unsigned long flags;
  92
  93         local_irq_save(flags);
  94         mtspr(SPRN_MAS5, MAS5_SGS | get_lpid(&vcpu_e500->vcpu));
  95         asm volatile("tlbilxlpid");
  96         mtspr(SPRN_MAS5, 0);
  97         local_irq_restore(flags);
  98 }
  99
 100 void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid)
 101 {
 102         vcpu->arch.pid = pid;
 103 }
 104
 105 void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr)
 106 {
 107 }
 108
 109 /* We use two lpids per VM */
 110 static DEFINE_PER_CPU(struct kvm_vcpu *[KVMPPC_NR_LPIDS], last_vcpu_of_lpid);
 111
 112 static void kvmppc_core_vcpu_load_e500mc(struct kvm_vcpu *vcpu, int cpu)
 113 {
 114         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 115
 116         kvmppc_booke_vcpu_load(vcpu, cpu);
 117
 118         mtspr(SPRN_LPID, get_lpid(vcpu));
 119         mtspr(SPRN_EPCR, vcpu->arch.shadow_epcr);
 120         mtspr(SPRN_GPIR, vcpu->vcpu_id);
 121         mtspr(SPRN_MSRP, vcpu->arch.shadow_msrp);
 122         vcpu->arch.eplc = EPC_EGS | (get_lpid(vcpu) << EPC_ELPID_SHIFT);
 123         vcpu->arch.epsc = vcpu->arch.eplc;
 124         mtspr(SPRN_EPLC, vcpu->arch.eplc);
 125         mtspr(SPRN_EPSC, vcpu->arch.epsc);
 126
 127         mtspr(SPRN_GIVPR, vcpu->arch.ivpr);
 128         mtspr(SPRN_GIVOR2, vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE]);
 129         mtspr(SPRN_GIVOR8, vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL]);
 130         mtspr(SPRN_GSPRG0, (unsigned long)vcpu->arch.shared->sprg0);
 131         mtspr(SPRN_GSPRG1, (unsigned long)vcpu->arch.shared->sprg1);
 132         mtspr(SPRN_GSPRG2, (unsigned long)vcpu->arch.shared->sprg2);
 133         mtspr(SPRN_GSPRG3, (unsigned long)vcpu->arch.shared->sprg3);
 134
 135         mtspr(SPRN_GSRR0, vcpu->arch.shared->srr0);
 136         mtspr(SPRN_GSRR1, vcpu->arch.shared->srr1);
 137
 138         mtspr(SPRN_GEPR, vcpu->arch.epr);
 139         mtspr(SPRN_GDEAR, vcpu->arch.shared->dar);
 140         mtspr(SPRN_GESR, vcpu->arch.shared->esr);
 141
 142         if (vcpu->arch.oldpir != mfspr(SPRN_PIR) ||
 143             __this_cpu_read(last_vcpu_of_lpid[get_lpid(vcpu)]) != vcpu) {
 144                 kvmppc_e500_tlbil_all(vcpu_e500);
 145                 __this_cpu_write(last_vcpu_of_lpid[get_lpid(vcpu)], vcpu);
 146         }
 147 }
 148
 149 static void kvmppc_core_vcpu_put_e500mc(struct kvm_vcpu *vcpu)
 150 {
 151         vcpu->arch.eplc = mfspr(SPRN_EPLC);
 152         vcpu->arch.epsc = mfspr(SPRN_EPSC);
 153
 154         vcpu->arch.shared->sprg0 = mfspr(SPRN_GSPRG0);
 155         vcpu->arch.shared->sprg1 = mfspr(SPRN_GSPRG1);
 156         vcpu->arch.shared->sprg2 = mfspr(SPRN_GSPRG2);
 157         vcpu->arch.shared->sprg3 = mfspr(SPRN_GSPRG3);
 158
 159         vcpu->arch.shared->srr0 = mfspr(SPRN_GSRR0);
 160         vcpu->arch.shared->srr1 = mfspr(SPRN_GSRR1);
 161
 162         vcpu->arch.epr = mfspr(SPRN_GEPR);
 163         vcpu->arch.shared->dar = mfspr(SPRN_GDEAR);
 164         vcpu->arch.shared->esr = mfspr(SPRN_GESR);
 165
 166         vcpu->arch.oldpir = mfspr(SPRN_PIR);
 167
 168         kvmppc_booke_vcpu_put(vcpu);
 169 }
 170
 171 int kvmppc_core_check_processor_compat(void)
 172 {
 173         int r;
 174
 175         if (strcmp(cur_cpu_spec->cpu_name, "e500mc") == 0)
 176                 r = 0;
 177         else if (strcmp(cur_cpu_spec->cpu_name, "e5500") == 0)
 178                 r = 0;
 179 #ifdef CONFIG_ALTIVEC
 180         /*
 181          * Since guests have the privilege to enable AltiVec, we need AltiVec
 182          * support in the host to save/restore their context.
 183          * Don't use CPU_FTR_ALTIVEC to identify cores with AltiVec unit
 184          * because it's cleared in the absence of CONFIG_ALTIVEC!
 185          */
 186         else if (strcmp(cur_cpu_spec->cpu_name, "e6500") == 0)
 187                 r = 0;
 188 #endif
 189         else
 190                 r = -ENOTSUPP;
 191
 192         return r;
 193 }
 194
 195 int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
 196 {
 197         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 198
 199         vcpu->arch.shadow_epcr = SPRN_EPCR_DSIGS | SPRN_EPCR_DGTMI | \
 200                                  SPRN_EPCR_DUVD;
 201 #ifdef CONFIG_64BIT
 202         vcpu->arch.shadow_epcr |= SPRN_EPCR_ICM;
 203 #endif
 204         vcpu->arch.shadow_msrp = MSRP_UCLEP | MSRP_PMMP;
 205
 206         vcpu->arch.pvr = mfspr(SPRN_PVR);
 207         vcpu_e500->svr = mfspr(SPRN_SVR);
 208
 209         vcpu->arch.cpu_type = KVM_CPU_E500MC;
 210
 211         return 0;
 212 }
 213
 214 static int kvmppc_core_get_sregs_e500mc(struct kvm_vcpu *vcpu,
 215                                         struct kvm_sregs *sregs)
 216 {
 217         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 218
 219         sregs->u.e.features |= KVM_SREGS_E_ARCH206_MMU | KVM_SREGS_E_PM |
 220                                KVM_SREGS_E_PC;
 221         sregs->u.e.impl_id = KVM_SREGS_E_IMPL_FSL;
 222
 223         sregs->u.e.impl.fsl.features = 0;
 224         sregs->u.e.impl.fsl.svr = vcpu_e500->svr;
 225         sregs->u.e.impl.fsl.hid0 = vcpu_e500->hid0;
 226         sregs->u.e.impl.fsl.mcar = vcpu_e500->mcar;
 227
 228         kvmppc_get_sregs_e500_tlb(vcpu, sregs);
 229
 230         sregs->u.e.ivor_high[3] =
 231                 vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
 232         sregs->u.e.ivor_high[4] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL];
 233         sregs->u.e.ivor_high[5] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT];
 234
 235         return kvmppc_get_sregs_ivor(vcpu, sregs);
 236 }
 237
 238 static int kvmppc_core_set_sregs_e500mc(struct kvm_vcpu *vcpu,
 239                                         struct kvm_sregs *sregs)
 240 {
 241         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 242         int ret;
 243
 244         if (sregs->u.e.impl_id == KVM_SREGS_E_IMPL_FSL) {
 245                 vcpu_e500->svr = sregs->u.e.impl.fsl.svr;
 246                 vcpu_e500->hid0 = sregs->u.e.impl.fsl.hid0;
 247                 vcpu_e500->mcar = sregs->u.e.impl.fsl.mcar;
 248         }
 249
 250         ret = kvmppc_set_sregs_e500_tlb(vcpu, sregs);
 251         if (ret < 0)
 252                 return ret;
 253
 254         if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
 255                 return 0;
 256
 257         if (sregs->u.e.features & KVM_SREGS_E_PM) {
 258                 vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] =
 259                         sregs->u.e.ivor_high[3];
 260         }
 261
 262         if (sregs->u.e.features & KVM_SREGS_E_PC) {
 263                 vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL] =
 264                         sregs->u.e.ivor_high[4];
 265                 vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT] =
 266                         sregs->u.e.ivor_high[5];
 267         }
 268
 269         return kvmppc_set_sregs_ivor(vcpu, sregs);
 270 }
 271
 272 static int kvmppc_get_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
 273                               union kvmppc_one_reg *val)
 274 {
 275         int r = 0;
 276
 277         switch (id) {
 278         case KVM_REG_PPC_SPRG9:
 279                 *val = get_reg_val(id, vcpu->arch.sprg9);
 280                 break;
 281         default:
 282                 r = kvmppc_get_one_reg_e500_tlb(vcpu, id, val);
 283         }
 284
 285         return r;
 286 }
 287
 288 static int kvmppc_set_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
 289                               union kvmppc_one_reg *val)
 290 {
 291         int r = 0;
 292
 293         switch (id) {
 294         case KVM_REG_PPC_SPRG9:
 295                 vcpu->arch.sprg9 = set_reg_val(id, *val);
 296                 break;
 297         default:
 298                 r = kvmppc_set_one_reg_e500_tlb(vcpu, id, val);
 299         }
 300
 301         return r;
 302 }
 303
 304 static int kvmppc_core_vcpu_create_e500mc(struct kvm_vcpu *vcpu)
 305 {
 306         struct kvmppc_vcpu_e500 *vcpu_e500;
 307         int err;
 308
 309         BUILD_BUG_ON(offsetof(struct kvmppc_vcpu_e500, vcpu) != 0);
 310         vcpu_e500 = to_e500(vcpu);
 311
 312         /* Invalid PIR value -- this LPID dosn't have valid state on any cpu */
 313         vcpu->arch.oldpir = 0xffffffff;
 314
 315         err = kvmppc_e500_tlb_init(vcpu_e500);
 316         if (err)
 317                 return err;
 318
 319         vcpu->arch.shared = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
 320         if (!vcpu->arch.shared) {
 321                 err = -ENOMEM;
 322                 goto uninit_tlb;
 323         }
 324
 325         return 0;
 326
 327 uninit_tlb:
 328         kvmppc_e500_tlb_uninit(vcpu_e500);
 329         return err;
 330 }
 331
 332 static void kvmppc_core_vcpu_free_e500mc(struct kvm_vcpu *vcpu)
 333 {
 334         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 335
 336         free_page((unsigned long)vcpu->arch.shared);
 337         kvmppc_e500_tlb_uninit(vcpu_e500);
 338 }
 339
 340 static int kvmppc_core_init_vm_e500mc(struct kvm *kvm)
 341 {
 342         int lpid;
 343
 344         lpid = kvmppc_alloc_lpid();
 345         if (lpid < 0)
 346                 return lpid;
 347
 348         /*
 349          * Use two lpids per VM on cores with two threads like e6500. Use
 350          * even numbers to speedup vcpu lpid computation with consecutive lpids
 351          * per VM. vm1 will use lpids 2 and 3, vm2 lpids 4 and 5, and so on.
 352          */
 353         if (threads_per_core == 2)
 354                 lpid <<= 1;
 355
 356         kvm->arch.lpid = lpid;
 357         return 0;
 358 }
 359
 360 static void kvmppc_core_destroy_vm_e500mc(struct kvm *kvm)
 361 {
 362         int lpid = kvm->arch.lpid;
 363
 364         if (threads_per_core == 2)
 365                 lpid >>= 1;
 366
 367         kvmppc_free_lpid(lpid);
 368 }
 369
 370 static struct kvmppc_ops kvm_ops_e500mc = {
 371         .get_sregs = kvmppc_core_get_sregs_e500mc,
 372         .set_sregs = kvmppc_core_set_sregs_e500mc,
 373         .get_one_reg = kvmppc_get_one_reg_e500mc,
 374         .set_one_reg = kvmppc_set_one_reg_e500mc,
 375         .vcpu_load   = kvmppc_core_vcpu_load_e500mc,
 376         .vcpu_put    = kvmppc_core_vcpu_put_e500mc,
 377         .vcpu_create = kvmppc_core_vcpu_create_e500mc,
 378         .vcpu_free   = kvmppc_core_vcpu_free_e500mc,
 379         .init_vm = kvmppc_core_init_vm_e500mc,
 380         .destroy_vm = kvmppc_core_destroy_vm_e500mc,
 381         .emulate_op = kvmppc_core_emulate_op_e500,
 382         .emulate_mtspr = kvmppc_core_emulate_mtspr_e500,
 383         .emulate_mfspr = kvmppc_core_emulate_mfspr_e500,
 384 };
 385
 386 static int __init kvmppc_e500mc_init(void)
 387 {
 388         int r;
 389
 390         r = kvmppc_booke_init();
 391         if (r)
 392                 goto err_out;
 393
 394         /*
 395          * Use two lpids per VM on dual threaded processors like e6500
 396          * to workarround the lack of tlb write conditional instruction.
 397          * Expose half the number of available hardware lpids to the lpid
 398          * allocator.
 399          */
 400         kvmppc_init_lpid(KVMPPC_NR_LPIDS/threads_per_core);
 401         kvmppc_claim_lpid(0); /* host */
 402
 403         r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
 404         if (r)
 405                 goto err_out;
 406         kvm_ops_e500mc.owner = THIS_MODULE;
 407         kvmppc_pr_ops = &kvm_ops_e500mc;
 408
 409 err_out:
 410         return r;
 411 }
 412
 413 static void __exit kvmppc_e500mc_exit(void)
 414 {
 415         kvmppc_pr_ops = NULL;
 416         kvmppc_booke_exit();
 417 }
 418
 419 module_init(kvmppc_e500mc_init);
 420 module_exit(kvmppc_e500mc_exit);
 421 MODULE_ALIAS_MISCDEV(KVM_MINOR);
 422 MODULE_ALIAS("devname:kvm");