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/slab.h>
  17 #include <linux/err.h>
  18
  19 #include <asm/reg.h>
  20 #include <asm/cputable.h>
  21 #include <asm/tlbflush.h>
  22 #include <asm/kvm_e500.h>
  23 #include <asm/kvm_ppc.h>
  24
  25 #include "booke.h"
  26 #include "e500_tlb.h"
  27
  28 void kvmppc_core_load_host_debugstate(struct kvm_vcpu *vcpu)
  29 {
  30 }
  31
  32 void kvmppc_core_load_guest_debugstate(struct kvm_vcpu *vcpu)
  33 {
  34 }
  35
  36 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
  37 {
  38         kvmppc_e500_tlb_load(vcpu, cpu);
  39 }
  40
  41 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
  42 {
  43         kvmppc_e500_tlb_put(vcpu);
  44 }
  45
  46 int kvmppc_core_check_processor_compat(void)
  47 {
  48         int r;
  49
  50         if (strcmp(cur_cpu_spec->cpu_name, "e500v2") == 0)
  51                 r = 0;
  52         else
  53                 r = -ENOTSUPP;
  54
  55         return r;
  56 }
  57
  58 int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
  59 {
  60         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
  61
  62         kvmppc_e500_tlb_setup(vcpu_e500);
  63
  64         /* Registers init */
  65         vcpu->arch.pvr = mfspr(SPRN_PVR);
  66
  67         /* Since booke kvm only support one core, update all vcpus' PIR to 0 */
  68         vcpu->vcpu_id = 0;
  69
  70         return 0;
  71 }
  72
  73 /* 'linear_address' is actually an encoding of AS|PID|EADDR . */
  74 int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
  75                                struct kvm_translation *tr)
  76 {
  77         int index;
  78         gva_t eaddr;
  79         u8 pid;
  80         u8 as;
  81
  82         eaddr = tr->linear_address;
  83         pid = (tr->linear_address >> 32) & 0xff;
  84         as = (tr->linear_address >> 40) & 0x1;
  85
  86         index = kvmppc_e500_tlb_search(vcpu, eaddr, pid, as);
  87         if (index < 0) {
  88                 tr->valid = 0;
  89                 return 0;
  90         }
  91
  92         tr->physical_address = kvmppc_mmu_xlate(vcpu, index, eaddr);
  93         /* XXX what does "writeable" and "usermode" even mean? */
  94         tr->valid = 1;
  95
  96         return 0;
  97 }
  98
  99 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
 100 {
 101         struct kvmppc_vcpu_e500 *vcpu_e500;
 102         struct kvm_vcpu *vcpu;
 103         int err;
 104
 105         vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 106         if (!vcpu_e500) {
 107                 err = -ENOMEM;
 108                 goto out;
 109         }
 110
 111         vcpu = &vcpu_e500->vcpu;
 112         err = kvm_vcpu_init(vcpu, kvm, id);
 113         if (err)
 114                 goto free_vcpu;
 115
 116         err = kvmppc_e500_tlb_init(vcpu_e500);
 117         if (err)
 118                 goto uninit_vcpu;
 119
 120         vcpu->arch.shared = (void*)__get_free_page(GFP_KERNEL|__GFP_ZERO);
 121         if (!vcpu->arch.shared)
 122                 goto uninit_tlb;
 123
 124         return vcpu;
 125
 126 uninit_tlb:
 127         kvmppc_e500_tlb_uninit(vcpu_e500);
 128 uninit_vcpu:
 129         kvm_vcpu_uninit(vcpu);
 130 free_vcpu:
 131         kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
 132 out:
 133         return ERR_PTR(err);
 134 }
 135
 136 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
 137 {
 138         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 139
 140         free_page((unsigned long)vcpu->arch.shared);
 141         kvmppc_e500_tlb_uninit(vcpu_e500);
 142         kvm_vcpu_uninit(vcpu);
 143         kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
 144 }
 145
 146 static int __init kvmppc_e500_init(void)
 147 {
 148         int r, i;
 149         unsigned long ivor[3];
 150         unsigned long max_ivor = 0;
 151
 152         r = kvmppc_booke_init();
 153         if (r)
 154                 return r;
 155
 156         /* copy extra E500 exception handlers */
 157         ivor[0] = mfspr(SPRN_IVOR32);
 158         ivor[1] = mfspr(SPRN_IVOR33);
 159         ivor[2] = mfspr(SPRN_IVOR34);
 160         for (i = 0; i < 3; i++) {
 161                 if (ivor[i] > max_ivor)
 162                         max_ivor = ivor[i];
 163
 164                 memcpy((void *)kvmppc_booke_handlers + ivor[i],
 165                        kvmppc_handlers_start + (i + 16) * kvmppc_handler_len,
 166                        kvmppc_handler_len);
 167         }
 168         flush_icache_range(kvmppc_booke_handlers,
 169                         kvmppc_booke_handlers + max_ivor + kvmppc_handler_len);
 170
 171         return kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
 172 }
 173
 174 static void __exit kvmppc_e500_exit(void)
 175 {
 176         kvmppc_booke_exit();
 177 }
 178
 179 module_init(kvmppc_e500_init);
 180 module_exit(kvmppc_e500_exit);