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 <asm/uaccess.h>
  19 #include <asm/kvm_ppc.h>
  20 #include <asm/kvm_book3s.h>
  21
  22 static unsigned long get_pteg_addr(struct kvm_vcpu *vcpu, long pte_index)
  23 {
  24         struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
  25         unsigned long pteg_addr;
  26
  27         pte_index <<= 4;
  28         pte_index &= ((1 << ((vcpu_book3s->sdr1 & 0x1f) + 11)) - 1) << 7 | 0x70;
  29         pteg_addr = vcpu_book3s->sdr1 & 0xfffffffffffc0000ULL;
  30         pteg_addr |= pte_index;
  31
  32         return pteg_addr;
  33 }
  34
  35 static int kvmppc_h_pr_enter(struct kvm_vcpu *vcpu)
  36 {
  37         long flags = kvmppc_get_gpr(vcpu, 4);
  38         long pte_index = kvmppc_get_gpr(vcpu, 5);
  39         unsigned long pteg[2 * 8];
  40         unsigned long pteg_addr, i, *hpte;
  41
  42         pte_index &= ~7UL;
  43         pteg_addr = get_pteg_addr(vcpu, pte_index);
  44
  45         copy_from_user(pteg, (void __user *)pteg_addr, sizeof(pteg));
  46         hpte = pteg;
  47
  48         if (likely((flags & H_EXACT) == 0)) {
  49                 pte_index &= ~7UL;
  50                 for (i = 0; ; ++i) {
  51                         if (i == 8)
  52                                 return H_PTEG_FULL;
  53                         if ((*hpte & HPTE_V_VALID) == 0)
  54                                 break;
  55                         hpte += 2;
  56                 }
  57         } else {
  58                 i = kvmppc_get_gpr(vcpu, 5) & 7UL;
  59                 hpte += i * 2;
  60         }
  61
  62         hpte[0] = kvmppc_get_gpr(vcpu, 6);
  63         hpte[1] = kvmppc_get_gpr(vcpu, 7);
  64         copy_to_user((void __user *)pteg_addr, pteg, sizeof(pteg));
  65         kvmppc_set_gpr(vcpu, 3, H_SUCCESS);
  66         kvmppc_set_gpr(vcpu, 4, pte_index | i);
  67
  68         return EMULATE_DONE;
  69 }
  70
  71 static int kvmppc_h_pr_remove(struct kvm_vcpu *vcpu)
  72 {
  73         unsigned long flags= kvmppc_get_gpr(vcpu, 4);
  74         unsigned long pte_index = kvmppc_get_gpr(vcpu, 5);
  75         unsigned long avpn = kvmppc_get_gpr(vcpu, 6);
  76         unsigned long v = 0, pteg, rb;
  77         unsigned long pte[2];
  78
  79         pteg = get_pteg_addr(vcpu, pte_index);
  80         copy_from_user(pte, (void __user *)pteg, sizeof(pte));
  81
  82         if ((pte[0] & HPTE_V_VALID) == 0 ||
  83             ((flags & H_AVPN) && (pte[0] & ~0x7fUL) != avpn) ||
  84             ((flags & H_ANDCOND) && (pte[0] & avpn) != 0)) {
  85                 kvmppc_set_gpr(vcpu, 3, H_NOT_FOUND);
  86                 return EMULATE_DONE;
  87         }
  88
  89         copy_to_user((void __user *)pteg, &v, sizeof(v));
  90
  91         rb = compute_tlbie_rb(pte[0], pte[1], pte_index);
  92         vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false);
  93
  94         kvmppc_set_gpr(vcpu, 3, H_SUCCESS);
  95         kvmppc_set_gpr(vcpu, 4, pte[0]);
  96         kvmppc_set_gpr(vcpu, 5, pte[1]);
  97
  98         return EMULATE_DONE;
  99 }
 100
 101 /* Request defs for kvmppc_h_pr_bulk_remove() */
 102 #define H_BULK_REMOVE_TYPE             0xc000000000000000ULL
 103 #define   H_BULK_REMOVE_REQUEST        0x4000000000000000ULL
 104 #define   H_BULK_REMOVE_RESPONSE       0x8000000000000000ULL
 105 #define   H_BULK_REMOVE_END            0xc000000000000000ULL
 106 #define H_BULK_REMOVE_CODE             0x3000000000000000ULL
 107 #define   H_BULK_REMOVE_SUCCESS        0x0000000000000000ULL
 108 #define   H_BULK_REMOVE_NOT_FOUND      0x1000000000000000ULL
 109 #define   H_BULK_REMOVE_PARM           0x2000000000000000ULL
 110 #define   H_BULK_REMOVE_HW             0x3000000000000000ULL
 111 #define H_BULK_REMOVE_RC               0x0c00000000000000ULL
 112 #define H_BULK_REMOVE_FLAGS            0x0300000000000000ULL
 113 #define   H_BULK_REMOVE_ABSOLUTE       0x0000000000000000ULL
 114 #define   H_BULK_REMOVE_ANDCOND        0x0100000000000000ULL
 115 #define   H_BULK_REMOVE_AVPN           0x0200000000000000ULL
 116 #define H_BULK_REMOVE_PTEX             0x00ffffffffffffffULL
 117 #define H_BULK_REMOVE_MAX_BATCH        4
 118
 119 static int kvmppc_h_pr_bulk_remove(struct kvm_vcpu *vcpu)
 120 {
 121         int i;
 122         int paramnr = 4;
 123         int ret = H_SUCCESS;
 124
 125         for (i = 0; i < H_BULK_REMOVE_MAX_BATCH; i++) {
 126                 unsigned long tsh = kvmppc_get_gpr(vcpu, paramnr+(2*i));
 127                 unsigned long tsl = kvmppc_get_gpr(vcpu, paramnr+(2*i)+1);
 128                 unsigned long pteg, rb, flags;
 129                 unsigned long pte[2];
 130                 unsigned long v = 0;
 131
 132                 if ((tsh & H_BULK_REMOVE_TYPE) == H_BULK_REMOVE_END) {
 133                         break; /* Exit success */
 134                 } else if ((tsh & H_BULK_REMOVE_TYPE) !=
 135                            H_BULK_REMOVE_REQUEST) {
 136                         ret = H_PARAMETER;
 137                         break; /* Exit fail */
 138                 }
 139
 140                 tsh &= H_BULK_REMOVE_PTEX | H_BULK_REMOVE_FLAGS;
 141                 tsh |= H_BULK_REMOVE_RESPONSE;
 142
 143                 if ((tsh & H_BULK_REMOVE_ANDCOND) &&
 144                     (tsh & H_BULK_REMOVE_AVPN)) {
 145                         tsh |= H_BULK_REMOVE_PARM;
 146                         kvmppc_set_gpr(vcpu, paramnr+(2*i), tsh);
 147                         ret = H_PARAMETER;
 148                         break; /* Exit fail */
 149                 }
 150
 151                 pteg = get_pteg_addr(vcpu, tsh & H_BULK_REMOVE_PTEX);
 152                 copy_from_user(pte, (void __user *)pteg, sizeof(pte));
 153
 154                 /* tsl = AVPN */
 155                 flags = (tsh & H_BULK_REMOVE_FLAGS) >> 26;
 156
 157                 if ((pte[0] & HPTE_V_VALID) == 0 ||
 158                     ((flags & H_AVPN) && (pte[0] & ~0x7fUL) != tsl) ||
 159                     ((flags & H_ANDCOND) && (pte[0] & tsl) != 0)) {
 160                         tsh |= H_BULK_REMOVE_NOT_FOUND;
 161                 } else {
 162                         /* Splat the pteg in (userland) hpt */
 163                         copy_to_user((void __user *)pteg, &v, sizeof(v));
 164
 165                         rb = compute_tlbie_rb(pte[0], pte[1],
 166                                               tsh & H_BULK_REMOVE_PTEX);
 167                         vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false);
 168                         tsh |= H_BULK_REMOVE_SUCCESS;
 169                         tsh |= (pte[1] & (HPTE_R_C | HPTE_R_R)) << 43;
 170                 }
 171                 kvmppc_set_gpr(vcpu, paramnr+(2*i), tsh);
 172         }
 173         kvmppc_set_gpr(vcpu, 3, ret);
 174
 175         return EMULATE_DONE;
 176 }
 177
 178 static int kvmppc_h_pr_protect(struct kvm_vcpu *vcpu)
 179 {
 180         unsigned long flags = kvmppc_get_gpr(vcpu, 4);
 181         unsigned long pte_index = kvmppc_get_gpr(vcpu, 5);
 182         unsigned long avpn = kvmppc_get_gpr(vcpu, 6);
 183         unsigned long rb, pteg, r, v;
 184         unsigned long pte[2];
 185
 186         pteg = get_pteg_addr(vcpu, pte_index);
 187         copy_from_user(pte, (void __user *)pteg, sizeof(pte));
 188
 189         if ((pte[0] & HPTE_V_VALID) == 0 ||
 190             ((flags & H_AVPN) && (pte[0] & ~0x7fUL) != avpn)) {
 191                 kvmppc_set_gpr(vcpu, 3, H_NOT_FOUND);
 192                 return EMULATE_DONE;
 193         }
 194
 195         v = pte[0];
 196         r = pte[1];
 197         r &= ~(HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_HI |
 198                HPTE_R_KEY_LO);
 199         r |= (flags << 55) & HPTE_R_PP0;
 200         r |= (flags << 48) & HPTE_R_KEY_HI;
 201         r |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO);
 202
 203         pte[1] = r;
 204
 205         rb = compute_tlbie_rb(v, r, pte_index);
 206         vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false);
 207         copy_to_user((void __user *)pteg, pte, sizeof(pte));
 208
 209         kvmppc_set_gpr(vcpu, 3, H_SUCCESS);
 210
 211         return EMULATE_DONE;
 212 }
 213
 214 int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
 215 {
 216         switch (cmd) {
 217         case H_ENTER:
 218                 return kvmppc_h_pr_enter(vcpu);
 219         case H_REMOVE:
 220                 return kvmppc_h_pr_remove(vcpu);
 221         case H_PROTECT:
 222                 return kvmppc_h_pr_protect(vcpu);
 223         case H_BULK_REMOVE:
 224                 return kvmppc_h_pr_bulk_remove(vcpu);
 225         case H_CEDE:
 226                 kvm_vcpu_block(vcpu);
 227                 vcpu->stat.halt_wakeup++;
 228                 return EMULATE_DONE;
 229         }
 230
 231         return EMULATE_FAIL;
 232 }