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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/slab.h>
 22 #include <linux/err.h>
 23 #include <linux/export.h>
 24 #include <linux/module.h>
 25 #include <linux/miscdevice.h>
 26 
 27 #include <asm/reg.h>
 28 #include <asm/cputable.h>
 29 #include <asm/tlbflush.h>
 30 #include <asm/kvm_44x.h>
 31 #include <asm/kvm_ppc.h>
 32 
 33 #include "44x_tlb.h"
 34 #include "booke.h"
 35 
 36 static void kvmppc_core_vcpu_load_44x(struct kvm_vcpu *vcpu, int cpu)
 37 {
 38         kvmppc_booke_vcpu_load(vcpu, cpu);
 39         kvmppc_44x_tlb_load(vcpu);
 40 }
 41 
 42 static void kvmppc_core_vcpu_put_44x(struct kvm_vcpu *vcpu)
 43 {
 44         kvmppc_44x_tlb_put(vcpu);
 45         kvmppc_booke_vcpu_put(vcpu);
 46 }
 47 
 48 int kvmppc_core_check_processor_compat(void)
 49 {
 50         int r;
 51 
 52         if (strncmp(cur_cpu_spec->platform, "ppc440", 6) == 0)
 53                 r = 0;
 54         else
 55                 r = -ENOTSUPP;
 56 
 57         return r;
 58 }
 59 
 60 int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
 61 {
 62         struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
 63         struct kvmppc_44x_tlbe *tlbe = &vcpu_44x->guest_tlb[0];
 64         int i;
 65 
 66         tlbe->tid = 0;
 67         tlbe->word0 = PPC44x_TLB_16M | PPC44x_TLB_VALID;
 68         tlbe->word1 = 0;
 69         tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR;
 70 
 71         tlbe++;
 72         tlbe->tid = 0;
 73         tlbe->word0 = 0xef600000 | PPC44x_TLB_4K | PPC44x_TLB_VALID;
 74         tlbe->word1 = 0xef600000;
 75         tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR
 76                       | PPC44x_TLB_I | PPC44x_TLB_G;
 77 
 78         /* Since the guest can directly access the timebase, it must know the
 79          * real timebase frequency. Accordingly, it must see the state of
 80          * CCR1[TCS]. */
 81         /* XXX CCR1 doesn't exist on all 440 SoCs. */
 82         vcpu->arch.ccr1 = mfspr(SPRN_CCR1);
 83 
 84         for (i = 0; i < ARRAY_SIZE(vcpu_44x->shadow_refs); i++)
 85                 vcpu_44x->shadow_refs[i].gtlb_index = -1;
 86 
 87         vcpu->arch.cpu_type = KVM_CPU_440;
 88         vcpu->arch.pvr = mfspr(SPRN_PVR);
 89 
 90         return 0;
 91 }
 92 
 93 /* 'linear_address' is actually an encoding of AS|PID|EADDR . */
 94 int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
 95                                struct kvm_translation *tr)
 96 {
 97         int index;
 98         gva_t eaddr;
 99         u8 pid;
100         u8 as;
101 
102         eaddr = tr->linear_address;
103         pid = (tr->linear_address >> 32) & 0xff;
104         as = (tr->linear_address >> 40) & 0x1;
105 
106         index = kvmppc_44x_tlb_index(vcpu, eaddr, pid, as);
107         if (index == -1) {
108                 tr->valid = 0;
109                 return 0;
110         }
111 
112         tr->physical_address = kvmppc_mmu_xlate(vcpu, index, eaddr);
113         /* XXX what does "writeable" and "usermode" even mean? */
114         tr->valid = 1;
115 
116         return 0;
117 }
118 
119 static int kvmppc_core_get_sregs_44x(struct kvm_vcpu *vcpu,
120                                       struct kvm_sregs *sregs)
121 {
122         return kvmppc_get_sregs_ivor(vcpu, sregs);
123 }
124 
125 static int kvmppc_core_set_sregs_44x(struct kvm_vcpu *vcpu,
126                                      struct kvm_sregs *sregs)
127 {
128         return kvmppc_set_sregs_ivor(vcpu, sregs);
129 }
130 
131 static int kvmppc_get_one_reg_44x(struct kvm_vcpu *vcpu, u64 id,
132                                   union kvmppc_one_reg *val)
133 {
134         return -EINVAL;
135 }
136 
137 static int kvmppc_set_one_reg_44x(struct kvm_vcpu *vcpu, u64 id,
138                                   union kvmppc_one_reg *val)
139 {
140         return -EINVAL;
141 }
142 
143 static struct kvm_vcpu *kvmppc_core_vcpu_create_44x(struct kvm *kvm,
144                                                     unsigned int id)
145 {
146         struct kvmppc_vcpu_44x *vcpu_44x;
147         struct kvm_vcpu *vcpu;
148         int err;
149 
150         vcpu_44x = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
151         if (!vcpu_44x) {
152                 err = -ENOMEM;
153                 goto out;
154         }
155 
156         vcpu = &vcpu_44x->vcpu;
157         err = kvm_vcpu_init(vcpu, kvm, id);
158         if (err)
159                 goto free_vcpu;
160 
161         vcpu->arch.shared = (void*)__get_free_page(GFP_KERNEL|__GFP_ZERO);
162         if (!vcpu->arch.shared)
163                 goto uninit_vcpu;
164 
165         return vcpu;
166 
167 uninit_vcpu:
168         kvm_vcpu_uninit(vcpu);
169 free_vcpu:
170         kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
171 out:
172         return ERR_PTR(err);
173 }
174 
175 static void kvmppc_core_vcpu_free_44x(struct kvm_vcpu *vcpu)
176 {
177         struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
178 
179         free_page((unsigned long)vcpu->arch.shared);
180         kvm_vcpu_uninit(vcpu);
181         kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
182 }
183 
184 static int kvmppc_core_init_vm_44x(struct kvm *kvm)
185 {
186         return 0;
187 }
188 
189 static void kvmppc_core_destroy_vm_44x(struct kvm *kvm)
190 {
191 }
192 
193 static struct kvmppc_ops kvm_ops_44x = {
194         .get_sregs = kvmppc_core_get_sregs_44x,
195         .set_sregs = kvmppc_core_set_sregs_44x,
196         .get_one_reg = kvmppc_get_one_reg_44x,
197         .set_one_reg = kvmppc_set_one_reg_44x,
198         .vcpu_load   = kvmppc_core_vcpu_load_44x,
199         .vcpu_put    = kvmppc_core_vcpu_put_44x,
200         .vcpu_create = kvmppc_core_vcpu_create_44x,
201         .vcpu_free   = kvmppc_core_vcpu_free_44x,
202         .mmu_destroy  = kvmppc_mmu_destroy_44x,
203         .init_vm = kvmppc_core_init_vm_44x,
204         .destroy_vm = kvmppc_core_destroy_vm_44x,
205         .emulate_op = kvmppc_core_emulate_op_44x,
206         .emulate_mtspr = kvmppc_core_emulate_mtspr_44x,
207         .emulate_mfspr = kvmppc_core_emulate_mfspr_44x,
208 };
209 
210 static int __init kvmppc_44x_init(void)
211 {
212         int r;
213 
214         r = kvmppc_booke_init();
215         if (r)
216                 goto err_out;
217 
218         r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_44x), 0, THIS_MODULE);
219         if (r)
220                 goto err_out;
221         kvm_ops_44x.owner = THIS_MODULE;
222         kvmppc_pr_ops = &kvm_ops_44x;
223 
224 err_out:
225         return r;
226 }
227 
228 static void __exit kvmppc_44x_exit(void)
229 {
230         kvmppc_pr_ops = NULL;
231         kvmppc_booke_exit();
232 }
233 
234 module_init(kvmppc_44x_init);
235 module_exit(kvmppc_44x_exit);
236 MODULE_ALIAS_MISCDEV(KVM_MINOR);
237 MODULE_ALIAS("devname:kvm");
238 

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