release/src-rt-6.x.4708/linux/linux-2.6.36/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
  24 #include <asm/reg.h>
  25 #include <asm/cputable.h>
  26 #include <asm/tlbflush.h>
  27 #include <asm/kvm_44x.h>
  28 #include <asm/kvm_ppc.h>
  29
  30 #include "44x_tlb.h"
  31
  32 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
  33 {
  34         kvmppc_44x_tlb_load(vcpu);
  35 }
  36
  37 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
  38 {
  39         kvmppc_44x_tlb_put(vcpu);
  40 }
  41
  42 int kvmppc_core_check_processor_compat(void)
  43 {
  44         int r;
  45
  46         if (strcmp(cur_cpu_spec->platform, "ppc440") == 0)
  47                 r = 0;
  48         else
  49                 r = -ENOTSUPP;
  50
  51         return r;
  52 }
  53
  54 int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
  55 {
  56         struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
  57         struct kvmppc_44x_tlbe *tlbe = &vcpu_44x->guest_tlb[0];
  58         int i;
  59
  60         tlbe->tid = 0;
  61         tlbe->word0 = PPC44x_TLB_16M | PPC44x_TLB_VALID;
  62         tlbe->word1 = 0;
  63         tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR;
  64
  65         tlbe++;
  66         tlbe->tid = 0;
  67         tlbe->word0 = 0xef600000 | PPC44x_TLB_4K | PPC44x_TLB_VALID;
  68         tlbe->word1 = 0xef600000;
  69         tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR
  70                       | PPC44x_TLB_I | PPC44x_TLB_G;
  71
  72         /* Since the guest can directly access the timebase, it must know the
  73          * real timebase frequency. Accordingly, it must see the state of
  74          * CCR1[TCS]. */
  75         vcpu->arch.ccr1 = mfspr(SPRN_CCR1);
  76
  77         for (i = 0; i < ARRAY_SIZE(vcpu_44x->shadow_refs); i++)
  78                 vcpu_44x->shadow_refs[i].gtlb_index = -1;
  79
  80         return 0;
  81 }
  82
  83 /* 'linear_address' is actually an encoding of AS|PID|EADDR . */
  84 int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
  85                                struct kvm_translation *tr)
  86 {
  87         int index;
  88         gva_t eaddr;
  89         u8 pid;
  90         u8 as;
  91
  92         eaddr = tr->linear_address;
  93         pid = (tr->linear_address >> 32) & 0xff;
  94         as = (tr->linear_address >> 40) & 0x1;
  95
  96         index = kvmppc_44x_tlb_index(vcpu, eaddr, pid, as);
  97         if (index == -1) {
  98                 tr->valid = 0;
  99                 return 0;
 100         }
 101
 102         tr->physical_address = kvmppc_mmu_xlate(vcpu, index, eaddr);
 103         tr->valid = 1;
 104
 105         return 0;
 106 }
 107
 108 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
 109 {
 110         struct kvmppc_vcpu_44x *vcpu_44x;
 111         struct kvm_vcpu *vcpu;
 112         int err;
 113
 114         vcpu_44x = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 115         if (!vcpu_44x) {
 116                 err = -ENOMEM;
 117                 goto out;
 118         }
 119
 120         vcpu = &vcpu_44x->vcpu;
 121         err = kvm_vcpu_init(vcpu, kvm, id);
 122         if (err)
 123                 goto free_vcpu;
 124
 125         return vcpu;
 126
 127 free_vcpu:
 128         kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
 129 out:
 130         return ERR_PTR(err);
 131 }
 132
 133 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
 134 {
 135         struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
 136
 137         kvm_vcpu_uninit(vcpu);
 138         kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
 139 }
 140
 141 static int __init kvmppc_44x_init(void)
 142 {
 143         int r;
 144
 145         r = kvmppc_booke_init();
 146         if (r)
 147                 return r;
 148
 149         return kvm_init(NULL, sizeof(struct kvmppc_vcpu_44x), 0, THIS_MODULE);
 150 }
 151
 152 static void __exit kvmppc_44x_exit(void)
 153 {
 154         kvmppc_booke_exit();
 155 }
 156
 157 module_init(kvmppc_44x_init);
 158 module_exit(kvmppc_44x_exit);