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dc1e35c6 SS |
1 | #ifndef __ASM_X86_XSAVE_H |
2 | #define __ASM_X86_XSAVE_H | |
3 | ||
6152e4b1 | 4 | #include <linux/types.h> |
dc1e35c6 | 5 | #include <asm/processor.h> |
59a36d16 | 6 | #include <linux/uaccess.h> |
dc1e35c6 | 7 | |
56c103ec LJ |
8 | /* Bit 63 of XCR0 is reserved for future expansion */ |
9 | #define XSTATE_EXTEND_MASK (~(XSTATE_FPSSE | (1ULL << 63))) | |
dc1e35c6 | 10 | |
677b98bd IM |
11 | #define XSTATE_CPUID 0x0000000d |
12 | ||
dc1e35c6 SS |
13 | #define FXSAVE_SIZE 512 |
14 | ||
2d5b5a66 SY |
15 | #define XSAVE_HDR_SIZE 64 |
16 | #define XSAVE_HDR_OFFSET FXSAVE_SIZE | |
17 | ||
18 | #define XSAVE_YMM_SIZE 256 | |
19 | #define XSAVE_YMM_OFFSET (XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET) | |
5ee481da | 20 | |
e7d820a5 | 21 | /* Supported features which support lazy state saving */ |
c2bc11f1 FY |
22 | #define XSTATE_LAZY (XSTATE_FP | XSTATE_SSE | XSTATE_YMM \ |
23 | | XSTATE_OPMASK | XSTATE_ZMM_Hi256 | XSTATE_Hi16_ZMM) | |
e7d820a5 QR |
24 | |
25 | /* Supported features which require eager state saving */ | |
26 | #define XSTATE_EAGER (XSTATE_BNDREGS | XSTATE_BNDCSR) | |
27 | ||
28 | /* All currently supported features */ | |
29 | #define XCNTXT_MASK (XSTATE_LAZY | XSTATE_EAGER) | |
dc1e35c6 | 30 | |
b359e8a4 SS |
31 | #ifdef CONFIG_X86_64 |
32 | #define REX_PREFIX "0x48, " | |
33 | #else | |
34 | #define REX_PREFIX | |
35 | #endif | |
36 | ||
6152e4b1 | 37 | extern unsigned int xstate_size; |
614df7fb | 38 | extern u64 xfeatures_mask; |
5b3efd50 | 39 | extern u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS]; |
dc1e35c6 | 40 | |
5b3efd50 | 41 | extern void update_regset_xstate_info(unsigned int size, u64 xstate_mask); |
b359e8a4 | 42 | |
c9e5a5a7 | 43 | /* These macros all use (%edi)/(%rdi) as the single memory argument. */ |
200b08a9 FY |
44 | #define XSAVE ".byte " REX_PREFIX "0x0f,0xae,0x27" |
45 | #define XSAVEOPT ".byte " REX_PREFIX "0x0f,0xae,0x37" | |
46 | #define XSAVES ".byte " REX_PREFIX "0x0f,0xc7,0x2f" | |
47 | #define XRSTOR ".byte " REX_PREFIX "0x0f,0xae,0x2f" | |
48 | #define XRSTORS ".byte " REX_PREFIX "0x0f,0xc7,0x1f" | |
49 | ||
b11ca7fb IM |
50 | /* xstate instruction fault handler: */ |
51 | #define xstate_fault(__err) \ | |
52 | \ | |
53 | ".section .fixup,\"ax\"\n" \ | |
54 | \ | |
55 | "3: movl $-1,%[err]\n" \ | |
56 | " jmp 2b\n" \ | |
57 | \ | |
58 | ".previous\n" \ | |
59 | \ | |
60 | _ASM_EXTABLE(1b, 3b) \ | |
61 | : [err] "=r" (__err) | |
b84e7055 | 62 | |
adb9d526 FY |
63 | /* |
64 | * This function is called only during boot time when x86 caps are not set | |
65 | * up and alternative can not be used yet. | |
66 | */ | |
c47ada30 | 67 | static inline int copy_xregs_to_kernel_booting(struct xregs_state *fx) |
adb9d526 | 68 | { |
3e261c14 | 69 | u64 mask = -1; |
adb9d526 FY |
70 | u32 lmask = mask; |
71 | u32 hmask = mask >> 32; | |
72 | int err = 0; | |
73 | ||
74 | WARN_ON(system_state != SYSTEM_BOOTING); | |
75 | ||
76 | if (boot_cpu_has(X86_FEATURE_XSAVES)) | |
77 | asm volatile("1:"XSAVES"\n\t" | |
78 | "2:\n\t" | |
b11ca7fb | 79 | xstate_fault(err) |
06c8173e | 80 | : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask) |
adb9d526 FY |
81 | : "memory"); |
82 | else | |
83 | asm volatile("1:"XSAVE"\n\t" | |
84 | "2:\n\t" | |
b11ca7fb | 85 | xstate_fault(err) |
06c8173e | 86 | : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask) |
adb9d526 | 87 | : "memory"); |
adb9d526 FY |
88 | return err; |
89 | } | |
90 | ||
91 | /* | |
92 | * This function is called only during boot time when x86 caps are not set | |
93 | * up and alternative can not be used yet. | |
94 | */ | |
c47ada30 | 95 | static inline int copy_kernel_to_xregs_booting(struct xregs_state *fx, u64 mask) |
adb9d526 FY |
96 | { |
97 | u32 lmask = mask; | |
98 | u32 hmask = mask >> 32; | |
99 | int err = 0; | |
100 | ||
101 | WARN_ON(system_state != SYSTEM_BOOTING); | |
102 | ||
103 | if (boot_cpu_has(X86_FEATURE_XSAVES)) | |
104 | asm volatile("1:"XRSTORS"\n\t" | |
105 | "2:\n\t" | |
b11ca7fb | 106 | xstate_fault(err) |
06c8173e | 107 | : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask) |
adb9d526 FY |
108 | : "memory"); |
109 | else | |
110 | asm volatile("1:"XRSTOR"\n\t" | |
111 | "2:\n\t" | |
b11ca7fb | 112 | xstate_fault(err) |
06c8173e | 113 | : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask) |
adb9d526 | 114 | : "memory"); |
adb9d526 FY |
115 | return err; |
116 | } | |
117 | ||
f31a9f7c FY |
118 | /* |
119 | * Save processor xstate to xsave area. | |
120 | */ | |
c47ada30 | 121 | static inline int copy_xregs_to_kernel(struct xregs_state *fx) |
f31a9f7c | 122 | { |
3e261c14 | 123 | u64 mask = -1; |
f31a9f7c FY |
124 | u32 lmask = mask; |
125 | u32 hmask = mask >> 32; | |
126 | int err = 0; | |
127 | ||
5e907bb0 | 128 | WARN_ON(!alternatives_patched); |
72ee6f87 | 129 | |
f31a9f7c FY |
130 | /* |
131 | * If xsaves is enabled, xsaves replaces xsaveopt because | |
132 | * it supports compact format and supervisor states in addition to | |
133 | * modified optimization in xsaveopt. | |
134 | * | |
135 | * Otherwise, if xsaveopt is enabled, xsaveopt replaces xsave | |
136 | * because xsaveopt supports modified optimization which is not | |
137 | * supported by xsave. | |
138 | * | |
139 | * If none of xsaves and xsaveopt is enabled, use xsave. | |
140 | */ | |
141 | alternative_input_2( | |
142 | "1:"XSAVE, | |
06c8173e | 143 | XSAVEOPT, |
f31a9f7c | 144 | X86_FEATURE_XSAVEOPT, |
06c8173e | 145 | XSAVES, |
f31a9f7c FY |
146 | X86_FEATURE_XSAVES, |
147 | [fx] "D" (fx), "a" (lmask), "d" (hmask) : | |
148 | "memory"); | |
149 | asm volatile("2:\n\t" | |
b11ca7fb | 150 | xstate_fault(err) |
f31a9f7c FY |
151 | : "0" (0) |
152 | : "memory"); | |
153 | ||
154 | return err; | |
155 | } | |
156 | ||
157 | /* | |
158 | * Restore processor xstate from xsave area. | |
159 | */ | |
c47ada30 | 160 | static inline int copy_kernel_to_xregs(struct xregs_state *fx, u64 mask) |
f31a9f7c FY |
161 | { |
162 | int err = 0; | |
163 | u32 lmask = mask; | |
164 | u32 hmask = mask >> 32; | |
165 | ||
166 | /* | |
167 | * Use xrstors to restore context if it is enabled. xrstors supports | |
168 | * compacted format of xsave area which is not supported by xrstor. | |
169 | */ | |
170 | alternative_input( | |
171 | "1: " XRSTOR, | |
06c8173e | 172 | XRSTORS, |
f31a9f7c FY |
173 | X86_FEATURE_XSAVES, |
174 | "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask) | |
175 | : "memory"); | |
176 | ||
177 | asm volatile("2:\n" | |
b11ca7fb | 178 | xstate_fault(err) |
f31a9f7c FY |
179 | : "0" (0) |
180 | : "memory"); | |
181 | ||
182 | return err; | |
183 | } | |
184 | ||
facbf4d9 FY |
185 | /* |
186 | * Save xstate to user space xsave area. | |
187 | * | |
188 | * We don't use modified optimization because xrstor/xrstors might track | |
189 | * a different application. | |
190 | * | |
191 | * We don't use compacted format xsave area for | |
192 | * backward compatibility for old applications which don't understand | |
193 | * compacted format of xsave area. | |
194 | */ | |
c47ada30 | 195 | static inline int copy_xregs_to_user(struct xregs_state __user *buf) |
9dc89c0f SS |
196 | { |
197 | int err; | |
8e221b6d SS |
198 | |
199 | /* | |
200 | * Clear the xsave header first, so that reserved fields are | |
201 | * initialized to zero. | |
202 | */ | |
3a54450b | 203 | err = __clear_user(&buf->header, sizeof(buf->header)); |
8e221b6d SS |
204 | if (unlikely(err)) |
205 | return -EFAULT; | |
206 | ||
63bcff2a | 207 | __asm__ __volatile__(ASM_STAC "\n" |
facbf4d9 | 208 | "1:"XSAVE"\n" |
63bcff2a | 209 | "2: " ASM_CLAC "\n" |
b11ca7fb | 210 | xstate_fault(err) |
9dc89c0f SS |
211 | : "D" (buf), "a" (-1), "d" (-1), "0" (0) |
212 | : "memory"); | |
9dc89c0f SS |
213 | return err; |
214 | } | |
215 | ||
facbf4d9 FY |
216 | /* |
217 | * Restore xstate from user space xsave area. | |
218 | */ | |
c47ada30 | 219 | static inline int copy_user_to_xregs(struct xregs_state __user *buf, u64 mask) |
9dc89c0f | 220 | { |
facbf4d9 | 221 | int err = 0; |
c47ada30 | 222 | struct xregs_state *xstate = ((__force struct xregs_state *)buf); |
6152e4b1 PA |
223 | u32 lmask = mask; |
224 | u32 hmask = mask >> 32; | |
9dc89c0f | 225 | |
63bcff2a | 226 | __asm__ __volatile__(ASM_STAC "\n" |
facbf4d9 | 227 | "1:"XRSTOR"\n" |
63bcff2a | 228 | "2: " ASM_CLAC "\n" |
b11ca7fb | 229 | xstate_fault(err) |
9dc89c0f SS |
230 | : "D" (xstate), "a" (lmask), "d" (hmask), "0" (0) |
231 | : "memory"); /* memory required? */ | |
232 | return err; | |
233 | } | |
234 | ||
c47ada30 | 235 | void *get_xsave_addr(struct xregs_state *xsave, int xstate); |
7496d645 | 236 | |
dc1e35c6 | 237 | #endif |