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
31void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
32{
33 kvmppc_44x_tlb_load(vcpu);
34}
35
36void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
37{
38 kvmppc_44x_tlb_put(vcpu);
39}
40
41int kvmppc_core_check_processor_compat(void)
42{
43 int r;
44
45 if (strcmp(cur_cpu_spec->platform, "ppc440") == 0)
46 r = 0;
47 else
48 r = -ENOTSUPP;
49
50 return r;
51}
52
53int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
54{
55 struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
56 struct kvmppc_44x_tlbe *tlbe = &vcpu_44x->guest_tlb[0];
57 int i;
58
59 tlbe->tid = 0;
60 tlbe->word0 = PPC44x_TLB_16M | PPC44x_TLB_VALID;
61 tlbe->word1 = 0;
62 tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR;
63
64 tlbe++;
65 tlbe->tid = 0;
66 tlbe->word0 = 0xef600000 | PPC44x_TLB_4K | PPC44x_TLB_VALID;
67 tlbe->word1 = 0xef600000;
68 tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR
69 | PPC44x_TLB_I | PPC44x_TLB_G;
70
71 /* Since the guest can directly access the timebase, it must know the
72 * real timebase frequency. Accordingly, it must see the state of
73 * CCR1[TCS]. */
74 vcpu->arch.ccr1 = mfspr(SPRN_CCR1);
75
76 for (i = 0; i < ARRAY_SIZE(vcpu_44x->shadow_refs); i++)
77 vcpu_44x->shadow_refs[i].gtlb_index = -1;
78
79 return 0;
80}
81
82/* 'linear_address' is actually an encoding of AS|PID|EADDR . */
83int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
84 struct kvm_translation *tr)
85{
86 int index;
87 gva_t eaddr;
88 u8 pid;
89 u8 as;
90
91 eaddr = tr->linear_address;
92 pid = (tr->linear_address >> 32) & 0xff;
93 as = (tr->linear_address >> 40) & 0x1;
94
95 index = kvmppc_44x_tlb_index(vcpu, eaddr, pid, as);
96 if (index == -1) {
97 tr->valid = 0;
98 return 0;
99 }
100
101 tr->physical_address = kvmppc_mmu_xlate(vcpu, index, eaddr);
102 /* XXX what does "writeable" and "usermode" even mean? */
103 tr->valid = 1;
104
105 return 0;
106}
107
108struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
109{
110 struct kvmppc_vcpu_44x *vcpu_44x;
111 struct kvm_vcpu *vcpu;
112 int err;
113
114 vcpu_44x = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
115 if (!vcpu_44x) {
116 err = -ENOMEM;
117 goto out;
118 }
119
120 vcpu = &vcpu_44x->vcpu;
121 err = kvm_vcpu_init(vcpu, kvm, id);
122 if (err)
123 goto free_vcpu;
124
125 return vcpu;
126
127free_vcpu:
128 kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
129out:
130 return ERR_PTR(err);
131}
132
133void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
134{
135 struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
136
137 kvm_vcpu_uninit(vcpu);
138 kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
139}
140
141static int __init kvmppc_44x_init(void)
142{
143 int r;
144
145 r = kvmppc_booke_init();
146 if (r)
147 return r;
148
149 return kvm_init(NULL, sizeof(struct kvmppc_vcpu_44x), THIS_MODULE);
150}
151
152static void __exit kvmppc_44x_exit(void)
153{
154 kvmppc_booke_exit();
155}
156
157module_init(kvmppc_44x_init);
158module_exit(kvmppc_44x_exit);