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
24#include <asm/reg.h>
25#include <asm/cputable.h>
26#include <asm/tlbflush.h>
27#include <asm/kvm_44x.h>
28#include <asm/kvm_ppc.h>
29
30#include "44x_tlb.h"
31
32void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
33{
34 kvmppc_44x_tlb_load(vcpu);
35}
36
37void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
38{
39 kvmppc_44x_tlb_put(vcpu);
40}
41
42int kvmppc_core_check_processor_compat(void)
43{
44 int r;
45
46 if (strncmp(cur_cpu_spec->platform, "ppc440", 6) == 0)
47 r = 0;
48 else
49 r = -ENOTSUPP;
50
51 return r;
52}
53
54int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
55{
56 struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
57 struct kvmppc_44x_tlbe *tlbe = &vcpu_44x->guest_tlb[0];
58 int i;
59
60 tlbe->tid = 0;
61 tlbe->word0 = PPC44x_TLB_16M | PPC44x_TLB_VALID;
62 tlbe->word1 = 0;
63 tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR;
64
65 tlbe++;
66 tlbe->tid = 0;
67 tlbe->word0 = 0xef600000 | PPC44x_TLB_4K | PPC44x_TLB_VALID;
68 tlbe->word1 = 0xef600000;
69 tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR
70 | PPC44x_TLB_I | PPC44x_TLB_G;
71
72 /* Since the guest can directly access the timebase, it must know the
73 * real timebase frequency. Accordingly, it must see the state of
74 * CCR1[TCS]. */
75 /* XXX CCR1 doesn't exist on all 440 SoCs. */
76 vcpu->arch.ccr1 = mfspr(SPRN_CCR1);
77
78 for (i = 0; i < ARRAY_SIZE(vcpu_44x->shadow_refs); i++)
79 vcpu_44x->shadow_refs[i].gtlb_index = -1;
80
81 return 0;
82}
83
84/* 'linear_address' is actually an encoding of AS|PID|EADDR . */
85int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
86 struct kvm_translation *tr)
87{
88 int index;
89 gva_t eaddr;
90 u8 pid;
91 u8 as;
92
93 eaddr = tr->linear_address;
94 pid = (tr->linear_address >> 32) & 0xff;
95 as = (tr->linear_address >> 40) & 0x1;
96
97 index = kvmppc_44x_tlb_index(vcpu, eaddr, pid, as);
98 if (index == -1) {
99 tr->valid = 0;
100 return 0;
101 }
102
103 tr->physical_address = kvmppc_mmu_xlate(vcpu, index, eaddr);
104 /* XXX what does "writeable" and "usermode" even mean? */
105 tr->valid = 1;
106
107 return 0;
108}
109
110struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
111{
112 struct kvmppc_vcpu_44x *vcpu_44x;
113 struct kvm_vcpu *vcpu;
114 int err;
115
116 vcpu_44x = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
117 if (!vcpu_44x) {
118 err = -ENOMEM;
119 goto out;
120 }
121
122 vcpu = &vcpu_44x->vcpu;
123 err = kvm_vcpu_init(vcpu, kvm, id);
124 if (err)
125 goto free_vcpu;
126
127 vcpu->arch.shared = (void*)__get_free_page(GFP_KERNEL|__GFP_ZERO);
128 if (!vcpu->arch.shared)
129 goto uninit_vcpu;
130
131 return vcpu;
132
133uninit_vcpu:
134 kvm_vcpu_uninit(vcpu);
135free_vcpu:
136 kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
137out:
138 return ERR_PTR(err);
139}
140
141void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
142{
143 struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
144
145 free_page((unsigned long)vcpu->arch.shared);
146 kvm_vcpu_uninit(vcpu);
147 kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
148}
149
150static int __init kvmppc_44x_init(void)
151{
152 int r;
153
154 r = kvmppc_booke_init();
155 if (r)
156 return r;
157
158 return kvm_init(NULL, sizeof(struct kvmppc_vcpu_44x), 0, THIS_MODULE);
159}
160
161static void __exit kvmppc_44x_exit(void)
162{
163 kvmppc_booke_exit();
164}
165
166module_init(kvmppc_44x_init);
167module_exit(kvmppc_44x_exit);