tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
36static 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
42static 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
48int 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
60int 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 . */
94int 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
119static 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
125static 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
131static int kvmppc_get_one_reg_44x(struct kvm_vcpu *vcpu, u64 id,
132 union kvmppc_one_reg *val)
133{
134 return -EINVAL;
135}
136
137static int kvmppc_set_one_reg_44x(struct kvm_vcpu *vcpu, u64 id,
138 union kvmppc_one_reg *val)
139{
140 return -EINVAL;
141}
142
143static 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
167uninit_vcpu:
168 kvm_vcpu_uninit(vcpu);
169free_vcpu:
170 kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
171out:
172 return ERR_PTR(err);
173}
174
175static 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
184static int kvmppc_core_init_vm_44x(struct kvm *kvm)
185{
186 return 0;
187}
188
189static void kvmppc_core_destroy_vm_44x(struct kvm *kvm)
190{
191}
192
193static 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
210static 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
224err_out:
225 return r;
226}
227
228static void __exit kvmppc_44x_exit(void)
229{
230 kvmppc_pr_ops = NULL;
231 kvmppc_booke_exit();
232}
233
234module_init(kvmppc_44x_init);
235module_exit(kvmppc_44x_exit);
236MODULE_ALIAS_MISCDEV(KVM_MINOR);
237MODULE_ALIAS("devname:kvm");