arch/powerpc/kvm/book3s_pr_papr.c

   1 /*
   2  * Copyright (C) 2011. Freescale Inc. All rights reserved.
   3  *
   4  * Authors:
   5  *    Alexander Graf <agraf@suse.de>
   6  *    Paul Mackerras <paulus@samba.org>
   7  *
   8  * Description:
   9  *
  10  * Hypercall handling for running PAPR guests in PR KVM on Book 3S
  11  * processors.
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License, version 2, as
  15  * published by the Free Software Foundation.
  16  */
  17
  18 #include <linux/anon_inodes.h>
  19
  20 #include <asm/uaccess.h>
  21 #include <asm/kvm_ppc.h>
  22 #include <asm/kvm_book3s.h>
  23
  24 #define HPTE_SIZE       16              /* bytes per HPT entry */
  25
  26 static unsigned long get_pteg_addr(struct kvm_vcpu *vcpu, long pte_index)
  27 {
  28         struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
  29         unsigned long pteg_addr;
  30
  31         pte_index <<= 4;
  32         pte_index &= ((1 << ((vcpu_book3s->sdr1 & 0x1f) + 11)) - 1) << 7 | 0x70;
  33         pteg_addr = vcpu_book3s->sdr1 & 0xfffffffffffc0000ULL;
  34         pteg_addr |= pte_index;
  35
  36         return pteg_addr;
  37 }
  38
  39 static int kvmppc_h_pr_enter(struct kvm_vcpu *vcpu)
  40 {
  41         long flags = kvmppc_get_gpr(vcpu, 4);
  42         long pte_index = kvmppc_get_gpr(vcpu, 5);
  43         unsigned long pteg[2 * 8];
  44         unsigned long pteg_addr, i, *hpte;
  45         long int ret;
  46
  47         i = pte_index & 7;
  48         pte_index &= ~7UL;
  49         pteg_addr = get_pteg_addr(vcpu, pte_index);
  50
  51         mutex_lock(&vcpu->kvm->arch.hpt_mutex);
  52         copy_from_user(pteg, (void __user *)pteg_addr, sizeof(pteg));
  53         hpte = pteg;
  54
  55         ret = H_PTEG_FULL;
  56         if (likely((flags & H_EXACT) == 0)) {
  57                 for (i = 0; ; ++i) {
  58                         if (i == 8)
  59                                 goto done;
  60                         if ((*hpte & HPTE_V_VALID) == 0)
  61                                 break;
  62                         hpte += 2;
  63                 }
  64         } else {
  65                 hpte += i * 2;
  66                 if (*hpte & HPTE_V_VALID)
  67                         goto done;
  68         }
  69
  70         hpte[0] = kvmppc_get_gpr(vcpu, 6);
  71         hpte[1] = kvmppc_get_gpr(vcpu, 7);
  72         pteg_addr += i * HPTE_SIZE;
  73         copy_to_user((void __user *)pteg_addr, hpte, HPTE_SIZE);
  74         kvmppc_set_gpr(vcpu, 4, pte_index | i);
  75         ret = H_SUCCESS;
  76
  77  done:
  78         mutex_unlock(&vcpu->kvm->arch.hpt_mutex);
  79         kvmppc_set_gpr(vcpu, 3, ret);
  80
  81         return EMULATE_DONE;
  82 }
  83
  84 static int kvmppc_h_pr_remove(struct kvm_vcpu *vcpu)
  85 {
  86         unsigned long flags= kvmppc_get_gpr(vcpu, 4);
  87         unsigned long pte_index = kvmppc_get_gpr(vcpu, 5);
  88         unsigned long avpn = kvmppc_get_gpr(vcpu, 6);
  89         unsigned long v = 0, pteg, rb;
  90         unsigned long pte[2];
  91         long int ret;
  92
  93         pteg = get_pteg_addr(vcpu, pte_index);
  94         mutex_lock(&vcpu->kvm->arch.hpt_mutex);
  95         copy_from_user(pte, (void __user *)pteg, sizeof(pte));
  96
  97         ret = H_NOT_FOUND;
  98         if ((pte[0] & HPTE_V_VALID) == 0 ||
  99             ((flags & H_AVPN) && (pte[0] & ~0x7fUL) != avpn) ||
 100             ((flags & H_ANDCOND) && (pte[0] & avpn) != 0))
 101                 goto done;
 102
 103         copy_to_user((void __user *)pteg, &v, sizeof(v));
 104
 105         rb = compute_tlbie_rb(pte[0], pte[1], pte_index);
 106         vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false);
 107
 108         ret = H_SUCCESS;
 109         kvmppc_set_gpr(vcpu, 4, pte[0]);
 110         kvmppc_set_gpr(vcpu, 5, pte[1]);
 111
 112  done:
 113         mutex_unlock(&vcpu->kvm->arch.hpt_mutex);
 114         kvmppc_set_gpr(vcpu, 3, ret);
 115
 116         return EMULATE_DONE;
 117 }
 118
 119 /* Request defs for kvmppc_h_pr_bulk_remove() */
 120 #define H_BULK_REMOVE_TYPE             0xc000000000000000ULL
 121 #define   H_BULK_REMOVE_REQUEST        0x4000000000000000ULL
 122 #define   H_BULK_REMOVE_RESPONSE       0x8000000000000000ULL
 123 #define   H_BULK_REMOVE_END            0xc000000000000000ULL
 124 #define H_BULK_REMOVE_CODE             0x3000000000000000ULL
 125 #define   H_BULK_REMOVE_SUCCESS        0x0000000000000000ULL
 126 #define   H_BULK_REMOVE_NOT_FOUND      0x1000000000000000ULL
 127 #define   H_BULK_REMOVE_PARM           0x2000000000000000ULL
 128 #define   H_BULK_REMOVE_HW             0x3000000000000000ULL
 129 #define H_BULK_REMOVE_RC               0x0c00000000000000ULL
 130 #define H_BULK_REMOVE_FLAGS            0x0300000000000000ULL
 131 #define   H_BULK_REMOVE_ABSOLUTE       0x0000000000000000ULL
 132 #define   H_BULK_REMOVE_ANDCOND        0x0100000000000000ULL
 133 #define   H_BULK_REMOVE_AVPN           0x0200000000000000ULL
 134 #define H_BULK_REMOVE_PTEX             0x00ffffffffffffffULL
 135 #define H_BULK_REMOVE_MAX_BATCH        4
 136
 137 static int kvmppc_h_pr_bulk_remove(struct kvm_vcpu *vcpu)
 138 {
 139         int i;
 140         int paramnr = 4;
 141         int ret = H_SUCCESS;
 142
 143         mutex_lock(&vcpu->kvm->arch.hpt_mutex);
 144         for (i = 0; i < H_BULK_REMOVE_MAX_BATCH; i++) {
 145                 unsigned long tsh = kvmppc_get_gpr(vcpu, paramnr+(2*i));
 146                 unsigned long tsl = kvmppc_get_gpr(vcpu, paramnr+(2*i)+1);
 147                 unsigned long pteg, rb, flags;
 148                 unsigned long pte[2];
 149                 unsigned long v = 0;
 150
 151                 if ((tsh & H_BULK_REMOVE_TYPE) == H_BULK_REMOVE_END) {
 152                         break; /* Exit success */
 153                 } else if ((tsh & H_BULK_REMOVE_TYPE) !=
 154                            H_BULK_REMOVE_REQUEST) {
 155                         ret = H_PARAMETER;
 156                         break; /* Exit fail */
 157                 }
 158
 159                 tsh &= H_BULK_REMOVE_PTEX | H_BULK_REMOVE_FLAGS;
 160                 tsh |= H_BULK_REMOVE_RESPONSE;
 161
 162                 if ((tsh & H_BULK_REMOVE_ANDCOND) &&
 163                     (tsh & H_BULK_REMOVE_AVPN)) {
 164                         tsh |= H_BULK_REMOVE_PARM;
 165                         kvmppc_set_gpr(vcpu, paramnr+(2*i), tsh);
 166                         ret = H_PARAMETER;
 167                         break; /* Exit fail */
 168                 }
 169
 170                 pteg = get_pteg_addr(vcpu, tsh & H_BULK_REMOVE_PTEX);
 171                 copy_from_user(pte, (void __user *)pteg, sizeof(pte));
 172
 173                 /* tsl = AVPN */
 174                 flags = (tsh & H_BULK_REMOVE_FLAGS) >> 26;
 175
 176                 if ((pte[0] & HPTE_V_VALID) == 0 ||
 177                     ((flags & H_AVPN) && (pte[0] & ~0x7fUL) != tsl) ||
 178                     ((flags & H_ANDCOND) && (pte[0] & tsl) != 0)) {
 179                         tsh |= H_BULK_REMOVE_NOT_FOUND;
 180                 } else {
 181                         /* Splat the pteg in (userland) hpt */
 182                         copy_to_user((void __user *)pteg, &v, sizeof(v));
 183
 184                         rb = compute_tlbie_rb(pte[0], pte[1],
 185                                               tsh & H_BULK_REMOVE_PTEX);
 186                         vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false);
 187                         tsh |= H_BULK_REMOVE_SUCCESS;
 188                         tsh |= (pte[1] & (HPTE_R_C | HPTE_R_R)) << 43;
 189                 }
 190                 kvmppc_set_gpr(vcpu, paramnr+(2*i), tsh);
 191         }
 192         mutex_unlock(&vcpu->kvm->arch.hpt_mutex);
 193         kvmppc_set_gpr(vcpu, 3, ret);
 194
 195         return EMULATE_DONE;
 196 }
 197
 198 static int kvmppc_h_pr_protect(struct kvm_vcpu *vcpu)
 199 {
 200         unsigned long flags = kvmppc_get_gpr(vcpu, 4);
 201         unsigned long pte_index = kvmppc_get_gpr(vcpu, 5);
 202         unsigned long avpn = kvmppc_get_gpr(vcpu, 6);
 203         unsigned long rb, pteg, r, v;
 204         unsigned long pte[2];
 205         long int ret;
 206
 207         pteg = get_pteg_addr(vcpu, pte_index);
 208         mutex_lock(&vcpu->kvm->arch.hpt_mutex);
 209         copy_from_user(pte, (void __user *)pteg, sizeof(pte));
 210
 211         ret = H_NOT_FOUND;
 212         if ((pte[0] & HPTE_V_VALID) == 0 ||
 213             ((flags & H_AVPN) && (pte[0] & ~0x7fUL) != avpn))
 214                 goto done;
 215
 216         v = pte[0];
 217         r = pte[1];
 218         r &= ~(HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_HI |
 219                HPTE_R_KEY_LO);
 220         r |= (flags << 55) & HPTE_R_PP0;
 221         r |= (flags << 48) & HPTE_R_KEY_HI;
 222         r |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO);
 223
 224         pte[1] = r;
 225
 226         rb = compute_tlbie_rb(v, r, pte_index);
 227         vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false);
 228         copy_to_user((void __user *)pteg, pte, sizeof(pte));
 229         ret = H_SUCCESS;
 230
 231  done:
 232         mutex_unlock(&vcpu->kvm->arch.hpt_mutex);
 233         kvmppc_set_gpr(vcpu, 3, ret);
 234
 235         return EMULATE_DONE;
 236 }
 237
 238 static int kvmppc_h_pr_put_tce(struct kvm_vcpu *vcpu)
 239 {
 240         unsigned long liobn = kvmppc_get_gpr(vcpu, 4);
 241         unsigned long ioba = kvmppc_get_gpr(vcpu, 5);
 242         unsigned long tce = kvmppc_get_gpr(vcpu, 6);
 243         long rc;
 244
 245         rc = kvmppc_h_put_tce(vcpu, liobn, ioba, tce);
 246         if (rc == H_TOO_HARD)
 247                 return EMULATE_FAIL;
 248         kvmppc_set_gpr(vcpu, 3, rc);
 249         return EMULATE_DONE;
 250 }
 251
 252 static int kvmppc_h_pr_xics_hcall(struct kvm_vcpu *vcpu, u32 cmd)
 253 {
 254         long rc = kvmppc_xics_hcall(vcpu, cmd);
 255         kvmppc_set_gpr(vcpu, 3, rc);
 256         return EMULATE_DONE;
 257 }
 258
 259 int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
 260 {
 261         switch (cmd) {
 262         case H_ENTER:
 263                 return kvmppc_h_pr_enter(vcpu);
 264         case H_REMOVE:
 265                 return kvmppc_h_pr_remove(vcpu);
 266         case H_PROTECT:
 267                 return kvmppc_h_pr_protect(vcpu);
 268         case H_BULK_REMOVE:
 269                 return kvmppc_h_pr_bulk_remove(vcpu);
 270         case H_PUT_TCE:
 271                 return kvmppc_h_pr_put_tce(vcpu);
 272         case H_CEDE:
 273                 vcpu->arch.shared->msr |= MSR_EE;
 274                 kvm_vcpu_block(vcpu);
 275                 clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
 276                 vcpu->stat.halt_wakeup++;
 277                 return EMULATE_DONE;
 278         case H_XIRR:
 279         case H_CPPR:
 280         case H_EOI:
 281         case H_IPI:
 282         case H_IPOLL:
 283         case H_XIRR_X:
 284                 if (kvmppc_xics_enabled(vcpu))
 285                         return kvmppc_h_pr_xics_hcall(vcpu, cmd);
 286                 break;
 287         case H_RTAS:
 288                 if (list_empty(&vcpu->kvm->arch.rtas_tokens))
 289                         return RESUME_HOST;
 290                 if (kvmppc_rtas_hcall(vcpu))
 291                         break;
 292                 kvmppc_set_gpr(vcpu, 3, 0);
 293                 return EMULATE_DONE;
 294         }
 295
 296         return EMULATE_FAIL;
 297 }