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
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Ultravisor Interfaces
*
* Copyright IBM Corp. 2019
*
* Author(s):
* Vasily Gorbik <gor@linux.ibm.com>
* Janosch Frank <frankja@linux.ibm.com>
*/
#ifndef _ASM_S390_UV_H
#define _ASM_S390_UV_H
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/bug.h>
#include <asm/page.h>
#define UVC_RC_EXECUTED 0x0001
#define UVC_RC_INV_CMD 0x0002
#define UVC_RC_INV_STATE 0x0003
#define UVC_RC_INV_LEN 0x0005
#define UVC_RC_NO_RESUME 0x0007
#define UVC_CMD_QUI 0x0001
#define UVC_CMD_INIT_UV 0x000f
#define UVC_CMD_SET_SHARED_ACCESS 0x1000
#define UVC_CMD_REMOVE_SHARED_ACCESS 0x1001
/* Bits in installed uv calls */
enum uv_cmds_inst {
BIT_UVC_CMD_QUI = 0,
BIT_UVC_CMD_INIT_UV = 1,
BIT_UVC_CMD_SET_SHARED_ACCESS = 8,
BIT_UVC_CMD_REMOVE_SHARED_ACCESS = 9,
};
struct uv_cb_header {
u16 len;
u16 cmd; /* Command Code */
u16 rc; /* Response Code */
u16 rrc; /* Return Reason Code */
} __packed __aligned(8);
struct uv_cb_qui {
struct uv_cb_header header;
u64 reserved08;
u64 inst_calls_list[4];
u64 reserved30[2];
u64 uv_base_stor_len;
u64 reserved48;
u64 conf_base_phys_stor_len;
u64 conf_base_virt_stor_len;
u64 conf_virt_var_stor_len;
u64 cpu_stor_len;
u32 reserved70[3];
u32 max_num_sec_conf;
u64 max_guest_stor_addr;
u8 reserved88[158 - 136];
u16 max_guest_cpus;
u8 reserveda0[200 - 160];
} __packed __aligned(8);
struct uv_cb_init {
struct uv_cb_header header;
u64 reserved08[2];
u64 stor_origin;
u64 stor_len;
u64 reserved28[4];
} __packed __aligned(8);
struct uv_cb_share {
struct uv_cb_header header;
u64 reserved08[3];
u64 paddr;
u64 reserved28;
} __packed __aligned(8);
static inline int uv_call(unsigned long r1, unsigned long r2)
{
int cc;
asm volatile(
"0: .insn rrf,0xB9A40000,%[r1],%[r2],0,0\n"
" brc 3,0b\n"
" ipm %[cc]\n"
" srl %[cc],28\n"
: [cc] "=d" (cc)
: [r1] "a" (r1), [r2] "a" (r2)
: "memory", "cc");
return cc;
}
struct uv_info {
unsigned long inst_calls_list[4];
unsigned long uv_base_stor_len;
unsigned long guest_base_stor_len;
unsigned long guest_virt_base_stor_len;
unsigned long guest_virt_var_stor_len;
unsigned long guest_cpu_stor_len;
unsigned long max_sec_stor_addr;
unsigned int max_num_sec_conf;
unsigned short max_guest_cpus;
};
extern struct uv_info uv_info;
#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
extern int prot_virt_guest;
static inline int is_prot_virt_guest(void)
{
return prot_virt_guest;
}
static inline int share(unsigned long addr, u16 cmd)
{
struct uv_cb_share uvcb = {
.header.cmd = cmd,
.header.len = sizeof(uvcb),
.paddr = addr
};
if (!is_prot_virt_guest())
return -EOPNOTSUPP;
/*
* Sharing is page wise, if we encounter addresses that are
* not page aligned, we assume something went wrong. If
* malloced structs are passed to this function, we could leak
* data to the hypervisor.
*/
BUG_ON(addr & ~PAGE_MASK);
if (!uv_call(0, (u64)&uvcb))
return 0;
return -EINVAL;
}
/*
* Guest 2 request to the Ultravisor to make a page shared with the
* hypervisor for IO.
*
* @addr: Real or absolute address of the page to be shared
*/
static inline int uv_set_shared(unsigned long addr)
{
return share(addr, UVC_CMD_SET_SHARED_ACCESS);
}
/*
* Guest 2 request to the Ultravisor to make a page unshared.
*
* @addr: Real or absolute address of the page to be unshared
*/
static inline int uv_remove_shared(unsigned long addr)
{
return share(addr, UVC_CMD_REMOVE_SHARED_ACCESS);
}
#else
#define is_prot_virt_guest() 0
static inline int uv_set_shared(unsigned long addr) { return 0; }
static inline int uv_remove_shared(unsigned long addr) { return 0; }
#endif
#if IS_ENABLED(CONFIG_KVM)
extern int prot_virt_host;
static inline int is_prot_virt_host(void)
{
return prot_virt_host;
}
void setup_uv(void);
void adjust_to_uv_max(unsigned long *vmax);
#else
#define is_prot_virt_host() 0
static inline void setup_uv(void) {}
static inline void adjust_to_uv_max(unsigned long *vmax) {}
#endif
#if defined(CONFIG_PROTECTED_VIRTUALIZATION_GUEST) || IS_ENABLED(CONFIG_KVM)
void uv_query_info(void);
#else
static inline void uv_query_info(void) {}
#endif
#endif /* _ASM_S390_UV_H */
|
