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/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
31/* Note: clearing MSR[DE] just means that the debug interrupt will not be
32 * delivered *immediately*. Instead, it simply sets the appropriate DBSR bits.
33 * If those DBSR bits are still set when MSR[DE] is re-enabled, the interrupt
34 * will be delivered as an "imprecise debug event" (which is indicated by
35 * DBSR[IDE].
36 */
37static void kvm44x_disable_debug_interrupts(void)
38{
39 mtmsr(mfmsr() & ~MSR_DE);
40}
41
42void kvmppc_core_load_host_debugstate(struct kvm_vcpu *vcpu)
43{
44 kvm44x_disable_debug_interrupts();
45
46 mtspr(SPRN_IAC1, vcpu->arch.host_iac[0]);
47 mtspr(SPRN_IAC2, vcpu->arch.host_iac[1]);
48 mtspr(SPRN_IAC3, vcpu->arch.host_iac[2]);
49 mtspr(SPRN_IAC4, vcpu->arch.host_iac[3]);
50 mtspr(SPRN_DBCR1, vcpu->arch.host_dbcr1);
51 mtspr(SPRN_DBCR2, vcpu->arch.host_dbcr2);
52 mtspr(SPRN_DBCR0, vcpu->arch.host_dbcr0);
53 mtmsr(vcpu->arch.host_msr);
54}
55
56void kvmppc_core_load_guest_debugstate(struct kvm_vcpu *vcpu)
57{
58 struct kvm_guest_debug *dbg = &vcpu->guest_debug;
59 u32 dbcr0 = 0;
60
61 vcpu->arch.host_msr = mfmsr();
62 kvm44x_disable_debug_interrupts();
63
64 /* Save host debug register state. */
65 vcpu->arch.host_iac[0] = mfspr(SPRN_IAC1);
66 vcpu->arch.host_iac[1] = mfspr(SPRN_IAC2);
67 vcpu->arch.host_iac[2] = mfspr(SPRN_IAC3);
68 vcpu->arch.host_iac[3] = mfspr(SPRN_IAC4);
69 vcpu->arch.host_dbcr0 = mfspr(SPRN_DBCR0);
70 vcpu->arch.host_dbcr1 = mfspr(SPRN_DBCR1);
71 vcpu->arch.host_dbcr2 = mfspr(SPRN_DBCR2);
72
73 /* set registers up for guest */
74
75 if (dbg->bp[0]) {
76 mtspr(SPRN_IAC1, dbg->bp[0]);
77 dbcr0 |= DBCR0_IAC1 | DBCR0_IDM;
78 }
79 if (dbg->bp[1]) {
80 mtspr(SPRN_IAC2, dbg->bp[1]);
81 dbcr0 |= DBCR0_IAC2 | DBCR0_IDM;
82 }
83 if (dbg->bp[2]) {
84 mtspr(SPRN_IAC3, dbg->bp[2]);
85 dbcr0 |= DBCR0_IAC3 | DBCR0_IDM;
86 }
87 if (dbg->bp[3]) {
88 mtspr(SPRN_IAC4, dbg->bp[3]);
89 dbcr0 |= DBCR0_IAC4 | DBCR0_IDM;
90 }
91
92 mtspr(SPRN_DBCR0, dbcr0);
93 mtspr(SPRN_DBCR1, 0);
94 mtspr(SPRN_DBCR2, 0);
95}
96
97void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
98{
99 kvmppc_44x_tlb_load(vcpu);
100}
101
102void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
103{
104 kvmppc_44x_tlb_put(vcpu);
105}
106
107int kvmppc_core_check_processor_compat(void)
108{
109 int r;
110
111 if (strcmp(cur_cpu_spec->platform, "ppc440") == 0)
112 r = 0;
113 else
114 r = -ENOTSUPP;
115
116 return r;
117}
118
119int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
120{
121 struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
122 struct kvmppc_44x_tlbe *tlbe = &vcpu_44x->guest_tlb[0];
123 int i;
124
125 tlbe->tid = 0;
126 tlbe->word0 = PPC44x_TLB_16M | PPC44x_TLB_VALID;
127 tlbe->word1 = 0;
128 tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR;
129
130 tlbe++;
131 tlbe->tid = 0;
132 tlbe->word0 = 0xef600000 | PPC44x_TLB_4K | PPC44x_TLB_VALID;
133 tlbe->word1 = 0xef600000;
134 tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR
135 | PPC44x_TLB_I | PPC44x_TLB_G;
136
137 /* Since the guest can directly access the timebase, it must know the
138 * real timebase frequency. Accordingly, it must see the state of
139 * CCR1[TCS]. */
140 vcpu->arch.ccr1 = mfspr(SPRN_CCR1);
141
142 for (i = 0; i < ARRAY_SIZE(vcpu_44x->shadow_refs); i++)
143 vcpu_44x->shadow_refs[i].gtlb_index = -1;
144
145 return 0;
146}
147
148/* 'linear_address' is actually an encoding of AS|PID|EADDR . */
149int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
150 struct kvm_translation *tr)
151{
152 struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
153 struct kvmppc_44x_tlbe *gtlbe;
154 int index;
155 gva_t eaddr;
156 u8 pid;
157 u8 as;
158
159 eaddr = tr->linear_address;
160 pid = (tr->linear_address >> 32) & 0xff;
161 as = (tr->linear_address >> 40) & 0x1;
162
163 index = kvmppc_44x_tlb_index(vcpu, eaddr, pid, as);
164 if (index == -1) {
165 tr->valid = 0;
166 return 0;
167 }
168
169 gtlbe = &vcpu_44x->guest_tlb[index];
170
171 tr->physical_address = tlb_xlate(gtlbe, eaddr);
172 /* XXX what does "writeable" and "usermode" even mean? */
173 tr->valid = 1;
174
175 return 0;
176}
177
178struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
179{
180 struct kvmppc_vcpu_44x *vcpu_44x;
181 struct kvm_vcpu *vcpu;
182 int err;
183
184 vcpu_44x = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
185 if (!vcpu_44x) {
186 err = -ENOMEM;
187 goto out;
188 }
189
190 vcpu = &vcpu_44x->vcpu;
191 err = kvm_vcpu_init(vcpu, kvm, id);
192 if (err)
193 goto free_vcpu;
194
195 return vcpu;
196
197free_vcpu:
198 kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
199out:
200 return ERR_PTR(err);
201}
202
203void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
204{
205 struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
206
207 kvm_vcpu_uninit(vcpu);
208 kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
209}
210
211static int kvmppc_44x_init(void)
212{
213 int r;
214
215 r = kvmppc_booke_init();
216 if (r)
217 return r;
218
219 return kvm_init(NULL, sizeof(struct kvmppc_vcpu_44x), THIS_MODULE);
220}
221
222static void kvmppc_44x_exit(void)
223{
224 kvmppc_booke_exit();
225}
226
227module_init(kvmppc_44x_init);
228module_exit(kvmppc_44x_exit);