linux/arch/powerpc/kvm/44x.c
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   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/err.h>
  22
  23#include <asm/reg.h>
  24#include <asm/cputable.h>
  25#include <asm/tlbflush.h>
  26#include <asm/kvm_44x.h>
  27#include <asm/kvm_ppc.h>
  28
  29#include "44x_tlb.h"
  30
  31void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
  32{
  33        kvmppc_44x_tlb_load(vcpu);
  34}
  35
  36void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
  37{
  38        kvmppc_44x_tlb_put(vcpu);
  39}
  40
  41int kvmppc_core_check_processor_compat(void)
  42{
  43        int r;
  44
  45        if (strcmp(cur_cpu_spec->platform, "ppc440") == 0)
  46                r = 0;
  47        else
  48                r = -ENOTSUPP;
  49
  50        return r;
  51}
  52
  53int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
  54{
  55        struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
  56        struct kvmppc_44x_tlbe *tlbe = &vcpu_44x->guest_tlb[0];
  57        int i;
  58
  59        tlbe->tid = 0;
  60        tlbe->word0 = PPC44x_TLB_16M | PPC44x_TLB_VALID;
  61        tlbe->word1 = 0;
  62        tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR;
  63
  64        tlbe++;
  65        tlbe->tid = 0;
  66        tlbe->word0 = 0xef600000 | PPC44x_TLB_4K | PPC44x_TLB_VALID;
  67        tlbe->word1 = 0xef600000;
  68        tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR
  69                      | PPC44x_TLB_I | PPC44x_TLB_G;
  70
  71        /* Since the guest can directly access the timebase, it must know the
  72         * real timebase frequency. Accordingly, it must see the state of
  73         * CCR1[TCS]. */
  74        vcpu->arch.ccr1 = mfspr(SPRN_CCR1);
  75
  76        for (i = 0; i < ARRAY_SIZE(vcpu_44x->shadow_refs); i++)
  77                vcpu_44x->shadow_refs[i].gtlb_index = -1;
  78
  79        return 0;
  80}
  81
  82/* 'linear_address' is actually an encoding of AS|PID|EADDR . */
  83int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
  84                               struct kvm_translation *tr)
  85{
  86        int index;
  87        gva_t eaddr;
  88        u8 pid;
  89        u8 as;
  90
  91        eaddr = tr->linear_address;
  92        pid = (tr->linear_address >> 32) & 0xff;
  93        as = (tr->linear_address >> 40) & 0x1;
  94
  95        index = kvmppc_44x_tlb_index(vcpu, eaddr, pid, as);
  96        if (index == -1) {
  97                tr->valid = 0;
  98                return 0;
  99        }
 100
 101        tr->physical_address = kvmppc_mmu_xlate(vcpu, index, eaddr);
 102        /* XXX what does "writeable" and "usermode" even mean? */
 103        tr->valid = 1;
 104
 105        return 0;
 106}
 107
 108struct 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
 127free_vcpu:
 128        kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
 129out:
 130        return ERR_PTR(err);
 131}
 132
 133void 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
 141static int 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), THIS_MODULE);
 150}
 151
 152static void kvmppc_44x_exit(void)
 153{
 154        kvmppc_booke_exit();
 155}
 156
 157module_init(kvmppc_44x_init);
 158module_exit(kvmppc_44x_exit);
 159