sys_regs.h
3.9 KB
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
/* 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__
struct sys_reg_params {
u8 Op0;
u8 Op1;
u8 CRn;
u8 CRm;
u8 Op2;
u64 regval;
bool is_write;
bool is_aarch32;
bool is_32bit; /* Only valid if is_aarch32 is true */
};
struct sys_reg_desc {
/* Sysreg string for debug */
const char *name;
/* 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. */
void (*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) */
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,
const struct kvm_one_reg *reg, void __user *uaddr);
int (*set_user)(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
const struct kvm_one_reg *reg, void __user *uaddr);
/* Return mask of REG_* runtime visibility overrides */
unsigned int (*visibility)(const struct kvm_vcpu *vcpu,
const struct sys_reg_desc *rd);
};
#define REG_HIDDEN_USER (1 << 0) /* hidden from userspace ioctls */
#define REG_HIDDEN_GUEST (1 << 1) /* hidden from guest */
static inline void print_sys_reg_instr(const struct sys_reg_params *p)
{
/* Look, we even formatted it for you to paste into the table! */
kvm_pr_unimpl(" { Op0(%2u), Op1(%2u), CRn(%2u), CRm(%2u), Op2(%2u), func_%s },\n",
p->Op0, p->Op1, p->CRn, p->CRm, p->Op2, p->is_write ? "write" : "read");
}
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 void 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;
}
static inline void 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;
}
static inline bool sysreg_hidden_from_guest(const struct kvm_vcpu *vcpu,
const struct sys_reg_desc *r)
{
if (likely(!r->visibility))
return false;
return r->visibility(vcpu, r) & REG_HIDDEN_GUEST;
}
static inline bool sysreg_hidden_from_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_USER;
}
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;
}
const struct sys_reg_desc *find_reg_by_id(u64 id,
struct sys_reg_params *params,
const struct sys_reg_desc table[],
unsigned int num);
#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__ */