summaryrefslogtreecommitdiff
path: root/arch/arm64/kvm/sys_regs.h
blob: 997eea21ba2ab3d7b08ae8f6178d208b74453606 (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
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2012,2013 - ARM Ltd
 * Author: Marc Zyngier <marc.zyngier@arm.com>
 *
 * Derived from arch/arm/kvm/coproc.h
 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
 * Authors: Christoffer Dall <c.dall@virtualopensystems.com>
 */

#ifndef __ARM64_KVM_SYS_REGS_LOCAL_H__
#define __ARM64_KVM_SYS_REGS_LOCAL_H__

#include <linux/bsearch.h>

#define reg_to_encoding(x)						\
	sys_reg((u32)(x)->Op0, (u32)(x)->Op1,				\
		(u32)(x)->CRn, (u32)(x)->CRm, (u32)(x)->Op2)

struct sys_reg_params {
	u8	Op0;
	u8	Op1;
	u8	CRn;
	u8	CRm;
	u8	Op2;
	u64	regval;
	bool	is_write;
};

#define encoding_to_params(reg)						\
	((struct sys_reg_params){ .Op0 = sys_reg_Op0(reg),		\
				  .Op1 = sys_reg_Op1(reg),		\
				  .CRn = sys_reg_CRn(reg),		\
				  .CRm = sys_reg_CRm(reg),		\
				  .Op2 = sys_reg_Op2(reg) })

#define esr_sys64_to_params(esr)                                               \
	((struct sys_reg_params){ .Op0 = ((esr) >> 20) & 3,                    \
				  .Op1 = ((esr) >> 14) & 0x7,                  \
				  .CRn = ((esr) >> 10) & 0xf,                  \
				  .CRm = ((esr) >> 1) & 0xf,                   \
				  .Op2 = ((esr) >> 17) & 0x7,                  \
				  .is_write = !((esr) & 1) })

#define esr_cp1x_32_to_params(esr)						\
	((struct sys_reg_params){ .Op1 = ((esr) >> 14) & 0x7,			\
				  .CRn = ((esr) >> 10) & 0xf,			\
				  .CRm = ((esr) >> 1) & 0xf,			\
				  .Op2 = ((esr) >> 17) & 0x7,			\
				  .is_write = !((esr) & 1) })

struct sys_reg_desc {
	/* Sysreg string for debug */
	const char *name;

	enum {
		AA32_DIRECT,
		AA32_LO,
		AA32_HI,
	} aarch32_map;

	/* MRS/MSR instruction which accesses it. */
	u8	Op0;
	u8	Op1;
	u8	CRn;
	u8	CRm;
	u8	Op2;

	/* Trapped access from guest, if non-NULL. */
	bool (*access)(struct kvm_vcpu *,
		       struct sys_reg_params *,
		       const struct sys_reg_desc *);

	/*
	 * Initialization for vcpu. Return initialized value, or KVM
	 * sanitized value for ID registers.
	 */
	u64 (*reset)(struct kvm_vcpu *, const struct sys_reg_desc *);

	/* Index into sys_reg[], or 0 if we don't need to save it. */
	int reg;

	/* Value (usually reset value), or write mask for idregs */
	u64 val;

	/* Custom get/set_user functions, fallback to generic if NULL */
	int (*get_user)(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
			u64 *val);
	int (*set_user)(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
			u64 val);

	/* Return mask of REG_* runtime visibility overrides */
	unsigned int (*visibility)(const struct kvm_vcpu *vcpu,
				   const struct sys_reg_desc *rd);
};

#define REG_HIDDEN		(1 << 0) /* hidden from userspace and guest */
#define REG_HIDDEN_USER		(1 << 1) /* hidden from userspace only */
#define REG_RAZ			(1 << 2) /* RAZ from userspace and guest */
#define REG_USER_WI		(1 << 3) /* WI from userspace only */

static __printf(2, 3)
inline void print_sys_reg_msg(const struct sys_reg_params *p,
				       char *fmt, ...)
{
	va_list va;

	va_start(va, fmt);
	/* Look, we even formatted it for you to paste into the table! */
	kvm_pr_unimpl("%pV { Op0(%2u), Op1(%2u), CRn(%2u), CRm(%2u), Op2(%2u), func_%s },\n",
		      &(struct va_format){ fmt, &va },
		      p->Op0, p->Op1, p->CRn, p->CRm, p->Op2, p->is_write ? "write" : "read");
	va_end(va);
}

static inline void print_sys_reg_instr(const struct sys_reg_params *p)
{
	/* GCC warns on an empty format string */
	print_sys_reg_msg(p, "%s", "");
}

static inline bool ignore_write(struct kvm_vcpu *vcpu,
				const struct sys_reg_params *p)
{
	return true;
}

static inline bool read_zero(struct kvm_vcpu *vcpu,
			     struct sys_reg_params *p)
{
	p->regval = 0;
	return true;
}

/* Reset functions */
static inline u64 reset_unknown(struct kvm_vcpu *vcpu,
				 const struct sys_reg_desc *r)
{
	BUG_ON(!r->reg);
	BUG_ON(r->reg >= NR_SYS_REGS);
	__vcpu_sys_reg(vcpu, r->reg) = 0x1de7ec7edbadc0deULL;
	return __vcpu_sys_reg(vcpu, r->reg);
}

static inline u64 reset_val(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
{
	BUG_ON(!r->reg);
	BUG_ON(r->reg >= NR_SYS_REGS);
	__vcpu_sys_reg(vcpu, r->reg) = r->val;
	return __vcpu_sys_reg(vcpu, r->reg);
}

static inline unsigned int sysreg_visibility(const struct kvm_vcpu *vcpu,
					     const struct sys_reg_desc *r)
{
	if (likely(!r->visibility))
		return 0;

	return r->visibility(vcpu, r);
}

static inline bool sysreg_hidden(const struct kvm_vcpu *vcpu,
				 const struct sys_reg_desc *r)
{
	return sysreg_visibility(vcpu, r) & REG_HIDDEN;
}

static inline bool sysreg_hidden_user(const struct kvm_vcpu *vcpu,
				      const struct sys_reg_desc *r)
{
	if (likely(!r->visibility))
		return false;

	return r->visibility(vcpu, r) & (REG_HIDDEN | REG_HIDDEN_USER);
}

static inline bool sysreg_visible_as_raz(const struct kvm_vcpu *vcpu,
					 const struct sys_reg_desc *r)
{
	return sysreg_visibility(vcpu, r) & REG_RAZ;
}

static inline bool sysreg_user_write_ignore(const struct kvm_vcpu *vcpu,
					    const struct sys_reg_desc *r)
{
	return sysreg_visibility(vcpu, r) & REG_USER_WI;
}

static inline int cmp_sys_reg(const struct sys_reg_desc *i1,
			      const struct sys_reg_desc *i2)
{
	BUG_ON(i1 == i2);
	if (!i1)
		return 1;
	else if (!i2)
		return -1;
	if (i1->Op0 != i2->Op0)
		return i1->Op0 - i2->Op0;
	if (i1->Op1 != i2->Op1)
		return i1->Op1 - i2->Op1;
	if (i1->CRn != i2->CRn)
		return i1->CRn - i2->CRn;
	if (i1->CRm != i2->CRm)
		return i1->CRm - i2->CRm;
	return i1->Op2 - i2->Op2;
}

static inline int match_sys_reg(const void *key, const void *elt)
{
	const unsigned long pval = (unsigned long)key;
	const struct sys_reg_desc *r = elt;

	return pval - reg_to_encoding(r);
}

static inline const struct sys_reg_desc *
find_reg(const struct sys_reg_params *params, const struct sys_reg_desc table[],
	 unsigned int num)
{
	unsigned long pval = reg_to_encoding(params);

	return __inline_bsearch((void *)pval, table, num, sizeof(table[0]), match_sys_reg);
}

const struct sys_reg_desc *get_reg_by_id(u64 id,
					 const struct sys_reg_desc table[],
					 unsigned int num);

int kvm_arm_sys_reg_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
int kvm_arm_sys_reg_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
int kvm_sys_reg_get_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg,
			 const struct sys_reg_desc table[], unsigned int num);
int kvm_sys_reg_set_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg,
			 const struct sys_reg_desc table[], unsigned int num);

bool triage_sysreg_trap(struct kvm_vcpu *vcpu, int *sr_index);

#define AA32(_x)	.aarch32_map = AA32_##_x
#define Op0(_x) 	.Op0 = _x
#define Op1(_x) 	.Op1 = _x
#define CRn(_x)		.CRn = _x
#define CRm(_x) 	.CRm = _x
#define Op2(_x) 	.Op2 = _x

#define SYS_DESC(reg)					\
	.name = #reg,					\
	Op0(sys_reg_Op0(reg)), Op1(sys_reg_Op1(reg)),	\
	CRn(sys_reg_CRn(reg)), CRm(sys_reg_CRm(reg)),	\
	Op2(sys_reg_Op2(reg))

#endif /* __ARM64_KVM_SYS_REGS_LOCAL_H__ */