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
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
/******************************************************************************
* arch/x86/hypercall.c
*
* Common x86 hypercall infrastructure.
*
* Copyright (c) 2015,2016 Citrix Systems Ltd.
*/
#include <xen/hypercall.h>
#include <asm/multicall.h>
#define NEXT_ARG(fmt, args) \
({ \
unsigned long __arg; \
switch ( *(fmt)++ ) \
{ \
case 'i': __arg = (unsigned long)va_arg(args, unsigned int); break; \
case 'l': __arg = (unsigned long)va_arg(args, unsigned long); break; \
case 'h': __arg = (unsigned long)va_arg(args, void *); break; \
default: goto bad_fmt; \
} \
__arg; \
})
unsigned long hypercall_create_continuation(
unsigned int op, const char *format, ...)
{
struct vcpu *curr = current;
struct mc_state *mcs = &curr->mc_state;
const char *p = format;
unsigned long arg;
unsigned int i;
va_list args;
curr->hcall_preempted = true;
va_start(args, format);
if ( mcs->flags & MCSF_in_multicall )
{
for ( i = 0; *p != '\0'; i++ )
mcs->call.args[i] = NEXT_ARG(p, args);
}
else
{
struct cpu_user_regs *regs = guest_cpu_user_regs();
regs->rax = op;
#ifdef CONFIG_COMPAT
if ( !curr->hcall_compat )
#else
if ( true )
#endif
{
for ( i = 0; *p != '\0'; i++ )
{
arg = NEXT_ARG(p, args);
switch ( i )
{
case 0: regs->rdi = arg; break;
case 1: regs->rsi = arg; break;
case 2: regs->rdx = arg; break;
case 3: regs->r10 = arg; break;
case 4: regs->r8 = arg; break;
case 5: regs->r9 = arg; break;
}
}
}
else
{
for ( i = 0; *p != '\0'; i++ )
{
arg = NEXT_ARG(p, args);
switch ( i )
{
case 0: regs->rbx = arg; break;
case 1: regs->rcx = arg; break;
case 2: regs->rdx = arg; break;
case 3: regs->rsi = arg; break;
case 4: regs->rdi = arg; break;
case 5: regs->rbp = arg; break;
}
}
}
}
va_end(args);
return op;
bad_fmt:
va_end(args);
gprintk(XENLOG_ERR, "Bad hypercall continuation format '%c'\n", *p);
ASSERT_UNREACHABLE();
domain_crash(curr->domain);
return 0;
}
#undef NEXT_ARG
void arch_hypercall_tasklet_result(struct vcpu *v, long res)
{
struct cpu_user_regs *regs = &v->arch.user_regs;
regs->rax = res;
}
int hypercall_xlat_continuation(unsigned int *id, unsigned int nr,
unsigned int mask, ...)
{
int rc = 0;
struct mc_state *mcs = ¤t->mc_state;
struct cpu_user_regs *regs;
unsigned int i, cval = 0;
unsigned long nval = 0;
va_list args;
ASSERT(nr <= ARRAY_SIZE(mcs->call.args));
ASSERT(!(mask >> nr));
ASSERT(!id || *id < nr);
ASSERT(!id || !(mask & (1U << *id)));
va_start(args, mask);
if ( mcs->flags & MCSF_in_multicall )
{
if ( !current->hcall_preempted )
{
va_end(args);
return 0;
}
for ( i = 0; i < nr; ++i, mask >>= 1 )
{
if ( mask & 1 )
{
nval = va_arg(args, unsigned long);
cval = va_arg(args, unsigned int);
if ( cval == nval )
mask &= ~1U;
else
BUG_ON(nval == (unsigned int)nval);
}
else if ( id && *id == i )
{
*id = mcs->call.args[i];
id = NULL;
}
if ( (mask & 1) && mcs->call.args[i] == nval )
{
mcs->call.args[i] = cval;
++rc;
}
else
BUG_ON(mcs->call.args[i] != (unsigned int)mcs->call.args[i]);
}
}
else
{
regs = guest_cpu_user_regs();
for ( i = 0; i < nr; ++i, mask >>= 1 )
{
unsigned long *reg;
switch ( i )
{
case 0: reg = ®s->rbx; break;
case 1: reg = ®s->rcx; break;
case 2: reg = ®s->rdx; break;
case 3: reg = ®s->rsi; break;
case 4: reg = ®s->rdi; break;
case 5: reg = ®s->rbp; break;
default: BUG(); reg = NULL; break;
}
if ( (mask & 1) )
{
nval = va_arg(args, unsigned long);
cval = va_arg(args, unsigned int);
if ( cval == nval )
mask &= ~1U;
else
BUG_ON(nval == (unsigned int)nval);
}
else if ( id && *id == i )
{
*id = *reg;
id = NULL;
}
if ( (mask & 1) && *reg == nval )
{
*reg = cval;
++rc;
}
else
BUG_ON(*reg != (unsigned int)*reg);
}
}
va_end(args);
return rc;
}
enum mc_disposition arch_do_multicall_call(struct mc_state *state)
{
const struct domain *currd = current->domain;
if ( is_pv_domain(currd) )
return pv_do_multicall_call(state);
if ( is_hvm_domain(currd) )
return hvm_do_multicall_call(state);
return mc_exit;
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
|
