arch/powerpc/kvm/e500.c

   1 /*
   2  * Copyright (C) 2008 Freescale Semiconductor, Inc. All rights reserved.
   3  *
   4  * Author: Yu Liu, <yu.liu@freescale.com>
   5  *
   6  * Description:
   7  * This file is derived from arch/powerpc/kvm/44x.c,
   8  * by Hollis Blanchard <hollisb@us.ibm.com>.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License, version 2, as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/kvm_host.h>
  16 #include <linux/err.h>
  17
  18 #include <asm/reg.h>
  19 #include <asm/cputable.h>
  20 #include <asm/tlbflush.h>
  21 #include <asm/kvm_e500.h>
  22 #include <asm/kvm_ppc.h>
  23
  24 #include "booke.h"
  25 #include "e500_tlb.h"
  26
  27 void kvmppc_core_load_host_debugstate(struct kvm_vcpu *vcpu)
  28 {
  29 }
  30
  31 void kvmppc_core_load_guest_debugstate(struct kvm_vcpu *vcpu)
  32 {
  33 }
  34
  35 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
  36 {
  37         kvmppc_e500_tlb_load(vcpu, cpu);
  38 }
  39
  40 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
  41 {
  42         kvmppc_e500_tlb_put(vcpu);
  43 }
  44
  45 int kvmppc_core_check_processor_compat(void)
  46 {
  47         int r;
  48
  49         if (strcmp(cur_cpu_spec->cpu_name, "e500v2") == 0)
  50                 r = 0;
  51         else
  52                 r = -ENOTSUPP;
  53
  54         return r;
  55 }
  56
  57 int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
  58 {
  59         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
  60
  61         kvmppc_e500_tlb_setup(vcpu_e500);
  62
  63         /* Registers init */
  64         vcpu->arch.pvr = mfspr(SPRN_PVR);
  65
  66         /* Since booke kvm only support one core, update all vcpus' PIR to 0 */
  67         vcpu->vcpu_id = 0;
  68
  69         return 0;
  70 }
  71
  72 /* 'linear_address' is actually an encoding of AS|PID|EADDR . */
  73 int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
  74                                struct kvm_translation *tr)
  75 {
  76         int index;
  77         gva_t eaddr;
  78         u8 pid;
  79         u8 as;
  80
  81         eaddr = tr->linear_address;
  82         pid = (tr->linear_address >> 32) & 0xff;
  83         as = (tr->linear_address >> 40) & 0x1;
  84
  85         index = kvmppc_e500_tlb_search(vcpu, eaddr, pid, as);
  86         if (index < 0) {
  87                 tr->valid = 0;
  88                 return 0;
  89         }
  90
  91         tr->physical_address = kvmppc_mmu_xlate(vcpu, index, eaddr);
  92         /* XXX what does "writeable" and "usermode" even mean? */
  93         tr->valid = 1;
  94
  95         return 0;
  96 }
  97
  98 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
  99 {
 100         struct kvmppc_vcpu_e500 *vcpu_e500;
 101         struct kvm_vcpu *vcpu;
 102         int err;
 103
 104         vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 105         if (!vcpu_e500) {
 106                 err = -ENOMEM;
 107                 goto out;
 108         }
 109
 110         vcpu = &vcpu_e500->vcpu;
 111         err = kvm_vcpu_init(vcpu, kvm, id);
 112         if (err)
 113                 goto free_vcpu;
 114
 115         err = kvmppc_e500_tlb_init(vcpu_e500);
 116         if (err)
 117                 goto uninit_vcpu;
 118
 119         return vcpu;
 120
 121 uninit_vcpu:
 122         kvm_vcpu_uninit(vcpu);
 123 free_vcpu:
 124         kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
 125 out:
 126         return ERR_PTR(err);
 127 }
 128
 129 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
 130 {
 131         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 132
 133         kvmppc_e500_tlb_uninit(vcpu_e500);
 134         kvm_vcpu_uninit(vcpu);
 135         kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
 136 }
 137
 138 static int __init kvmppc_e500_init(void)
 139 {
 140         int r, i;
 141         unsigned long ivor[3];
 142         unsigned long max_ivor = 0;
 143
 144         r = kvmppc_booke_init();
 145         if (r)
 146                 return r;
 147
 148         /* copy extra E500 exception handlers */
 149         ivor[0] = mfspr(SPRN_IVOR32);
 150         ivor[1] = mfspr(SPRN_IVOR33);
 151         ivor[2] = mfspr(SPRN_IVOR34);
 152         for (i = 0; i < 3; i++) {
 153                 if (ivor[i] > max_ivor)
 154                         max_ivor = ivor[i];
 155
 156                 memcpy((void *)kvmppc_booke_handlers + ivor[i],
 157                        kvmppc_handlers_start + (i + 16) * kvmppc_handler_len,
 158                        kvmppc_handler_len);
 159         }
 160         flush_icache_range(kvmppc_booke_handlers,
 161                         kvmppc_booke_handlers + max_ivor + kvmppc_handler_len);
 162
 163         return kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), THIS_MODULE);
 164 }
 165
 166 static void __init kvmppc_e500_exit(void)
 167 {
 168         kvmppc_booke_exit();
 169 }
 170
 171 module_init(kvmppc_e500_init);
 172 module_exit(kvmppc_e500_exit);