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
  25 #include <asm/reg.h>
  26 #include <asm/cputable.h>
  27 #include <asm/tlbflush.h>
  28 #include <asm/kvm_44x.h>
  29 #include <asm/kvm_ppc.h>
  30
  31 #include "44x_tlb.h"
  32 #include "booke.h"
  33
  34 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
  35 {
  36         kvmppc_booke_vcpu_load(vcpu, cpu);
  37         kvmppc_44x_tlb_load(vcpu);
  38 }
  39
  40 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
  41 {
  42         kvmppc_44x_tlb_put(vcpu);
  43         kvmppc_booke_vcpu_put(vcpu);
  44 }
  45
  46 int kvmppc_core_check_processor_compat(void)
  47 {
  48         int r;
  49
  50         if (strncmp(cur_cpu_spec->platform, "ppc440", 6) == 0)
  51                 r = 0;
  52         else
  53                 r = -ENOTSUPP;
  54
  55         return r;
  56 }
  57
  58 int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
  59 {
  60         struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
  61         struct kvmppc_44x_tlbe *tlbe = &vcpu_44x->guest_tlb[0];
  62         int i;
  63
  64         tlbe->tid = 0;
  65         tlbe->word0 = PPC44x_TLB_16M | PPC44x_TLB_VALID;
  66         tlbe->word1 = 0;
  67         tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR;
  68
  69         tlbe++;
  70         tlbe->tid = 0;
  71         tlbe->word0 = 0xef600000 | PPC44x_TLB_4K | PPC44x_TLB_VALID;
  72         tlbe->word1 = 0xef600000;
  73         tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR
  74                       | PPC44x_TLB_I | PPC44x_TLB_G;
  75
  76         /* Since the guest can directly access the timebase, it must know the
  77          * real timebase frequency. Accordingly, it must see the state of
  78          * CCR1[TCS]. */
  79         /* XXX CCR1 doesn't exist on all 440 SoCs. */
  80         vcpu->arch.ccr1 = mfspr(SPRN_CCR1);
  81
  82         for (i = 0; i < ARRAY_SIZE(vcpu_44x->shadow_refs); i++)
  83                 vcpu_44x->shadow_refs[i].gtlb_index = -1;
  84
  85         vcpu->arch.cpu_type = KVM_CPU_440;
  86
  87         return 0;
  88 }
  89
  90 /* 'linear_address' is actually an encoding of AS|PID|EADDR . */
  91 int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
  92                                struct kvm_translation *tr)
  93 {
  94         int index;
  95         gva_t eaddr;
  96         u8 pid;
  97         u8 as;
  98
  99         eaddr = tr->linear_address;
 100         pid = (tr->linear_address >> 32) & 0xff;
 101         as = (tr->linear_address >> 40) & 0x1;
 102
 103         index = kvmppc_44x_tlb_index(vcpu, eaddr, pid, as);
 104         if (index == -1) {
 105                 tr->valid = 0;
 106                 return 0;
 107         }
 108
 109         tr->physical_address = kvmppc_mmu_xlate(vcpu, index, eaddr);
 110         /* XXX what does "writeable" and "usermode" even mean? */
 111         tr->valid = 1;
 112
 113         return 0;
 114 }
 115
 116 void kvmppc_core_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 117 {
 118         kvmppc_get_sregs_ivor(vcpu, sregs);
 119 }
 120
 121 int kvmppc_core_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 122 {
 123         return kvmppc_set_sregs_ivor(vcpu, sregs);
 124 }
 125
 126 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
 127 {
 128         struct kvmppc_vcpu_44x *vcpu_44x;
 129         struct kvm_vcpu *vcpu;
 130         int err;
 131
 132         vcpu_44x = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 133         if (!vcpu_44x) {
 134                 err = -ENOMEM;
 135                 goto out;
 136         }
 137
 138         vcpu = &vcpu_44x->vcpu;
 139         err = kvm_vcpu_init(vcpu, kvm, id);
 140         if (err)
 141                 goto free_vcpu;
 142
 143         vcpu->arch.shared = (void*)__get_free_page(GFP_KERNEL|__GFP_ZERO);
 144         if (!vcpu->arch.shared)
 145                 goto uninit_vcpu;
 146
 147         return vcpu;
 148
 149 uninit_vcpu:
 150         kvm_vcpu_uninit(vcpu);
 151 free_vcpu:
 152         kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
 153 out:
 154         return ERR_PTR(err);
 155 }
 156
 157 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
 158 {
 159         struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
 160
 161         free_page((unsigned long)vcpu->arch.shared);
 162         kvm_vcpu_uninit(vcpu);
 163         kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
 164 }
 165
 166 int kvmppc_core_init_vm(struct kvm *kvm)
 167 {
 168         return 0;
 169 }
 170
 171 void kvmppc_core_destroy_vm(struct kvm *kvm)
 172 {
 173 }
 174
 175 static int __init kvmppc_44x_init(void)
 176 {
 177         int r;
 178
 179         r = kvmppc_booke_init();
 180         if (r)
 181                 return r;
 182
 183         return kvm_init(NULL, sizeof(struct kvmppc_vcpu_44x), 0, THIS_MODULE);
 184 }
 185
 186 static void __exit kvmppc_44x_exit(void)
 187 {
 188         kvmppc_booke_exit();
 189 }
 190
 191 module_init(kvmppc_44x_init);
 192 module_exit(kvmppc_44x_exit);