aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kvm/44x.c
blob: da3a1225c0ac10117918f105799f8d60b20665ce (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright IBM Corp. 2008
 *
 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
 */

#include <linux/kvm_host.h>
#include <linux/slab.h>
#include <linux/err.h>

#include <asm/reg.h>
#include <asm/cputable.h>
#include <asm/tlbflush.h>
#include <asm/kvm_44x.h>
#include <asm/kvm_ppc.h>

#include "44x_tlb.h"

void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
	kvmppc_44x_tlb_load(vcpu);
}

void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
{
	kvmppc_44x_tlb_put(vcpu);
}

int kvmppc_core_check_processor_compat(void)
{
	int r;

	if (strncmp(cur_cpu_spec->platform, "ppc440", 6) == 0)
		r = 0;
	else
		r = -ENOTSUPP;

	return r;
}

int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
{
	struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
	struct kvmppc_44x_tlbe *tlbe = &vcpu_44x->guest_tlb[0];
	int i;

	tlbe->tid = 0;
	tlbe->word0 = PPC44x_TLB_16M | PPC44x_TLB_VALID;
	tlbe->word1 = 0;
	tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR;

	tlbe++;
	tlbe->tid = 0;
	tlbe->word0 = 0xef600000 | PPC44x_TLB_4K | PPC44x_TLB_VALID;
	tlbe->word1 = 0xef600000;
	tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR
	              | PPC44x_TLB_I | PPC44x_TLB_G;

	/* Since the guest can directly access the timebase, it must know the
	 * real timebase frequency. Accordingly, it must see the state of
	 * CCR1[TCS]. */
	/* XXX CCR1 doesn't exist on all 440 SoCs. */
	vcpu->arch.ccr1 = mfspr(SPRN_CCR1);

	for (i = 0; i < ARRAY_SIZE(vcpu_44x->shadow_refs); i++)
		vcpu_44x->shadow_refs[i].gtlb_index = -1;

	return 0;
}

/* 'linear_address' is actually an encoding of AS|PID|EADDR . */
int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
                               struct kvm_translation *tr)
{
	int index;
	gva_t eaddr;
	u8 pid;
	u8 as;

	eaddr = tr->linear_address;
	pid = (tr->linear_address >> 32) & 0xff;
	as = (tr->linear_address >> 40) & 0x1;

	index = kvmppc_44x_tlb_index(vcpu, eaddr, pid, as);
	if (index == -1) {
		tr->valid = 0;
		return 0;
	}

	tr->physical_address = kvmppc_mmu_xlate(vcpu, index, eaddr);
	/* XXX what does "writeable" and "usermode" even mean? */
	tr->valid = 1;

	return 0;
}

void kvmppc_core_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
{
	kvmppc_get_sregs_ivor(vcpu, sregs);
}

int kvmppc_core_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
{
	return kvmppc_set_sregs_ivor(vcpu, sregs);
}

struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
{
	struct kvmppc_vcpu_44x *vcpu_44x;
	struct kvm_vcpu *vcpu;
	int err;

	vcpu_44x = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
	if (!vcpu_44x) {
		err = -ENOMEM;
		goto out;
	}

	vcpu = &vcpu_44x->vcpu;
	err = kvm_vcpu_init(vcpu, kvm, id);
	if (err)
		goto free_vcpu;

	vcpu->arch.shared = (void*)__get_free_page(GFP_KERNEL|__GFP_ZERO);
	if (!vcpu->arch.shared)
		goto uninit_vcpu;

	return vcpu;

uninit_vcpu:
	kvm_vcpu_uninit(vcpu);
free_vcpu:
	kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
out:
	return ERR_PTR(err);
}

void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
{
	struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);

	free_page((unsigned long)vcpu->arch.shared);
	kvm_vcpu_uninit(vcpu);
	kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
}

static int __init kvmppc_44x_init(void)
{
	int r;

	r = kvmppc_booke_init();
	if (r)
		return r;

	return kvm_init(NULL, sizeof(struct kvmppc_vcpu_44x), 0, THIS_MODULE);
}

static void __exit kvmppc_44x_exit(void)
{
	kvmppc_booke_exit();
}

module_init(kvmppc_44x_init);
module_exit(kvmppc_44x_exit);