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