arch/powerpc/kvm/44x.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License, version 2, as
   4  * published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  * GNU General Public License for more details.
  10  *
  11  * You should have received a copy of the GNU General Public License
  12  * along with this program; if not, write to the Free Software
  13  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  14  *
  15  * Copyright IBM Corp. 2008
  16  *
  17  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
  18  */
  19
  20 #include <linux/kvm_host.h>
  21 #include <linux/slab.h>
  22 #include <linux/err.h>
  23 #include <linux/export.h>
  24 #include <linux/module.h>
  25 #include <linux/miscdevice.h>
  26
  27 #include <asm/reg.h>
  28 #include <asm/cputable.h>
  29 #include <asm/tlbflush.h>
  30 #include <asm/kvm_44x.h>
  31 #include <asm/kvm_ppc.h>
  32
  33 #include "44x_tlb.h"
  34 #include "booke.h"
  35
  36 static void kvmppc_core_vcpu_load_44x(struct kvm_vcpu *vcpu, int cpu)
  37 {
  38         kvmppc_booke_vcpu_load(vcpu, cpu);
  39         kvmppc_44x_tlb_load(vcpu);
  40 }
  41
  42 static void kvmppc_core_vcpu_put_44x(struct kvm_vcpu *vcpu)
  43 {
  44         kvmppc_44x_tlb_put(vcpu);
  45         kvmppc_booke_vcpu_put(vcpu);
  46 }
  47
  48 int kvmppc_core_check_processor_compat(void)
  49 {
  50         int r;
  51
  52         if (strncmp(cur_cpu_spec->platform, "ppc440", 6) == 0)
  53                 r = 0;
  54         else
  55                 r = -ENOTSUPP;
  56
  57         return r;
  58 }
  59
  60 int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
  61 {
  62         struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
  63         struct kvmppc_44x_tlbe *tlbe = &vcpu_44x->guest_tlb[0];
  64         int i;
  65
  66         tlbe->tid = 0;
  67         tlbe->word0 = PPC44x_TLB_16M | PPC44x_TLB_VALID;
  68         tlbe->word1 = 0;
  69         tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR;
  70
  71         tlbe++;
  72         tlbe->tid = 0;
  73         tlbe->word0 = 0xef600000 | PPC44x_TLB_4K | PPC44x_TLB_VALID;
  74         tlbe->word1 = 0xef600000;
  75         tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR
  76                       | PPC44x_TLB_I | PPC44x_TLB_G;
  77
  78         /* Since the guest can directly access the timebase, it must know the
  79          * real timebase frequency. Accordingly, it must see the state of
  80          * CCR1[TCS]. */
  81         /* XXX CCR1 doesn't exist on all 440 SoCs. */
  82         vcpu->arch.ccr1 = mfspr(SPRN_CCR1);
  83
  84         for (i = 0; i < ARRAY_SIZE(vcpu_44x->shadow_refs); i++)
  85                 vcpu_44x->shadow_refs[i].gtlb_index = -1;
  86
  87         vcpu->arch.cpu_type = KVM_CPU_440;
  88         vcpu->arch.pvr = mfspr(SPRN_PVR);
  89
  90         return 0;
  91 }
  92
  93 /* 'linear_address' is actually an encoding of AS|PID|EADDR . */
  94 int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
  95                                struct kvm_translation *tr)
  96 {
  97         int index;
  98         gva_t eaddr;
  99         u8 pid;
 100         u8 as;
 101
 102         eaddr = tr->linear_address;
 103         pid = (tr->linear_address >> 32) & 0xff;
 104         as = (tr->linear_address >> 40) & 0x1;
 105
 106         index = kvmppc_44x_tlb_index(vcpu, eaddr, pid, as);
 107         if (index == -1) {
 108                 tr->valid = 0;
 109                 return 0;
 110         }
 111
 112         tr->physical_address = kvmppc_mmu_xlate(vcpu, index, eaddr);
 113         /* XXX what does "writeable" and "usermode" even mean? */
 114         tr->valid = 1;
 115
 116         return 0;
 117 }
 118
 119 static int kvmppc_core_get_sregs_44x(struct kvm_vcpu *vcpu,
 120                                       struct kvm_sregs *sregs)
 121 {
 122         return kvmppc_get_sregs_ivor(vcpu, sregs);
 123 }
 124
 125 static int kvmppc_core_set_sregs_44x(struct kvm_vcpu *vcpu,
 126                                      struct kvm_sregs *sregs)
 127 {
 128         return kvmppc_set_sregs_ivor(vcpu, sregs);
 129 }
 130
 131 static int kvmppc_get_one_reg_44x(struct kvm_vcpu *vcpu, u64 id,
 132                                   union kvmppc_one_reg *val)
 133 {
 134         return -EINVAL;
 135 }
 136
 137 static int kvmppc_set_one_reg_44x(struct kvm_vcpu *vcpu, u64 id,
 138                                   union kvmppc_one_reg *val)
 139 {
 140         return -EINVAL;
 141 }
 142
 143 static struct kvm_vcpu *kvmppc_core_vcpu_create_44x(struct kvm *kvm,
 144                                                     unsigned int id)
 145 {
 146         struct kvmppc_vcpu_44x *vcpu_44x;
 147         struct kvm_vcpu *vcpu;
 148         int err;
 149
 150         vcpu_44x = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 151         if (!vcpu_44x) {
 152                 err = -ENOMEM;
 153                 goto out;
 154         }
 155
 156         vcpu = &vcpu_44x->vcpu;
 157         err = kvm_vcpu_init(vcpu, kvm, id);
 158         if (err)
 159                 goto free_vcpu;
 160
 161         vcpu->arch.shared = (void*)__get_free_page(GFP_KERNEL|__GFP_ZERO);
 162         if (!vcpu->arch.shared)
 163                 goto uninit_vcpu;
 164
 165         return vcpu;
 166
 167 uninit_vcpu:
 168         kvm_vcpu_uninit(vcpu);
 169 free_vcpu:
 170         kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
 171 out:
 172         return ERR_PTR(err);
 173 }
 174
 175 static void kvmppc_core_vcpu_free_44x(struct kvm_vcpu *vcpu)
 176 {
 177         struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
 178
 179         free_page((unsigned long)vcpu->arch.shared);
 180         kvm_vcpu_uninit(vcpu);
 181         kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
 182 }
 183
 184 static int kvmppc_core_init_vm_44x(struct kvm *kvm)
 185 {
 186         return 0;
 187 }
 188
 189 static void kvmppc_core_destroy_vm_44x(struct kvm *kvm)
 190 {
 191 }
 192
 193 static struct kvmppc_ops kvm_ops_44x = {
 194         .get_sregs = kvmppc_core_get_sregs_44x,
 195         .set_sregs = kvmppc_core_set_sregs_44x,
 196         .get_one_reg = kvmppc_get_one_reg_44x,
 197         .set_one_reg = kvmppc_set_one_reg_44x,
 198         .vcpu_load   = kvmppc_core_vcpu_load_44x,
 199         .vcpu_put    = kvmppc_core_vcpu_put_44x,
 200         .vcpu_create = kvmppc_core_vcpu_create_44x,
 201         .vcpu_free   = kvmppc_core_vcpu_free_44x,
 202         .mmu_destroy  = kvmppc_mmu_destroy_44x,
 203         .init_vm = kvmppc_core_init_vm_44x,
 204         .destroy_vm = kvmppc_core_destroy_vm_44x,
 205         .emulate_op = kvmppc_core_emulate_op_44x,
 206         .emulate_mtspr = kvmppc_core_emulate_mtspr_44x,
 207         .emulate_mfspr = kvmppc_core_emulate_mfspr_44x,
 208 };
 209
 210 static int __init kvmppc_44x_init(void)
 211 {
 212         int r;
 213
 214         r = kvmppc_booke_init();
 215         if (r)
 216                 goto err_out;
 217
 218         r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_44x), 0, THIS_MODULE);
 219         if (r)
 220                 goto err_out;
 221         kvm_ops_44x.owner = THIS_MODULE;
 222         kvmppc_pr_ops = &kvm_ops_44x;
 223
 224 err_out:
 225         return r;
 226 }
 227
 228 static void __exit kvmppc_44x_exit(void)
 229 {
 230         kvmppc_pr_ops = NULL;
 231         kvmppc_booke_exit();
 232 }
 233
 234 module_init(kvmppc_44x_init);
 235 module_exit(kvmppc_44x_exit);
 236 MODULE_ALIAS_MISCDEV(KVM_MINOR);
 237 MODULE_ALIAS("devname:kvm");