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         return 0;
  83 }
  84
  85 /* 'linear_address' is actually an encoding of AS|PID|EADDR . */
  86 int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
  87                                struct kvm_translation *tr)
  88 {
  89         int index;
  90         gva_t eaddr;
  91         u8 pid;
  92         u8 as;
  93
  94         eaddr = tr->linear_address;
  95         pid = (tr->linear_address >> 32) & 0xff;
  96         as = (tr->linear_address >> 40) & 0x1;
  97
  98         index = kvmppc_44x_tlb_index(vcpu, eaddr, pid, as);
  99         if (index == -1) {
 100                 tr->valid = 0;
 101                 return 0;
 102         }
 103
 104         tr->physical_address = kvmppc_mmu_xlate(vcpu, index, eaddr);
 105         /* XXX what does "writeable" and "usermode" even mean? */
 106         tr->valid = 1;
 107
 108         return 0;
 109 }
 110
 111 void kvmppc_core_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 112 {
 113         kvmppc_get_sregs_ivor(vcpu, sregs);
 114 }
 115
 116 int kvmppc_core_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 117 {
 118         return kvmppc_set_sregs_ivor(vcpu, sregs);
 119 }
 120
 121 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
 122 {
 123         struct kvmppc_vcpu_44x *vcpu_44x;
 124         struct kvm_vcpu *vcpu;
 125         int err;
 126
 127         vcpu_44x = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 128         if (!vcpu_44x) {
 129                 err = -ENOMEM;
 130                 goto out;
 131         }
 132
 133         vcpu = &vcpu_44x->vcpu;
 134         err = kvm_vcpu_init(vcpu, kvm, id);
 135         if (err)
 136                 goto free_vcpu;
 137
 138         vcpu->arch.shared = (void*)__get_free_page(GFP_KERNEL|__GFP_ZERO);
 139         if (!vcpu->arch.shared)
 140                 goto uninit_vcpu;
 141
 142         return vcpu;
 143
 144 uninit_vcpu:
 145         kvm_vcpu_uninit(vcpu);
 146 free_vcpu:
 147         kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
 148 out:
 149         return ERR_PTR(err);
 150 }
 151
 152 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
 153 {
 154         struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
 155
 156         free_page((unsigned long)vcpu->arch.shared);
 157         kvm_vcpu_uninit(vcpu);
 158         kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
 159 }
 160
 161 static int __init kvmppc_44x_init(void)
 162 {
 163         int r;
 164
 165         r = kvmppc_booke_init();
 166         if (r)
 167                 return r;
 168
 169         return kvm_init(NULL, sizeof(struct kvmppc_vcpu_44x), 0, THIS_MODULE);
 170 }
 171
 172 static void __exit kvmppc_44x_exit(void)
 173 {
 174         kvmppc_booke_exit();
 175 }
 176
 177 module_init(kvmppc_44x_init);
 178 module_exit(kvmppc_44x_exit);