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1/*
2 * access guest memory
3 *
4 * Copyright IBM Corp. 2008, 2014
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License (version 2 only)
8 * as published by the Free Software Foundation.
9 *
10 * Author(s): Carsten Otte <cotte@de.ibm.com>
11 */
12
13#ifndef __KVM_S390_GACCESS_H
14#define __KVM_S390_GACCESS_H
15
16#include <linux/compiler.h>
17#include <linux/kvm_host.h>
18#include <linux/uaccess.h>
19#include <linux/ptrace.h>
20#include "kvm-s390.h"
21
22/**
23 * kvm_s390_real_to_abs - convert guest real address to guest absolute address
24 * @vcpu - guest virtual cpu
25 * @gra - guest real address
26 *
27 * Returns the guest absolute address that corresponds to the passed guest real
28 * address @gra of a virtual guest cpu by applying its prefix.
29 */
30static inline unsigned long kvm_s390_real_to_abs(struct kvm_vcpu *vcpu,
31 unsigned long gra)
32{
33 unsigned long prefix = kvm_s390_get_prefix(vcpu);
34
35 if (gra < 2 * PAGE_SIZE)
36 gra += prefix;
37 else if (gra >= prefix && gra < prefix + 2 * PAGE_SIZE)
38 gra -= prefix;
39 return gra;
40}
41
42/**
43 * kvm_s390_logical_to_effective - convert guest logical to effective address
44 * @vcpu: guest virtual cpu
45 * @ga: guest logical address
46 *
47 * Convert a guest vcpu logical address to a guest vcpu effective address by
48 * applying the rules of the vcpu's addressing mode defined by PSW bits 31
49 * and 32 (extendended/basic addressing mode).
50 *
51 * Depending on the vcpu's addressing mode the upper 40 bits (24 bit addressing
52 * mode), 33 bits (31 bit addressing mode) or no bits (64 bit addressing mode)
53 * of @ga will be zeroed and the remaining bits will be returned.
54 */
55static inline unsigned long kvm_s390_logical_to_effective(struct kvm_vcpu *vcpu,
56 unsigned long ga)
57{
58 psw_t *psw = &vcpu->arch.sie_block->gpsw;
59
60 if (psw_bits(*psw).eaba == PSW_AMODE_64BIT)
61 return ga;
62 if (psw_bits(*psw).eaba == PSW_AMODE_31BIT)
63 return ga & ((1UL << 31) - 1);
64 return ga & ((1UL << 24) - 1);
65}
66
67/*
68 * put_guest_lc, read_guest_lc and write_guest_lc are guest access functions
69 * which shall only be used to access the lowcore of a vcpu.
70 * These functions should be used for e.g. interrupt handlers where no
71 * guest memory access protection facilities, like key or low address
72 * protection, are applicable.
73 * At a later point guest vcpu lowcore access should happen via pinned
74 * prefix pages, so that these pages can be accessed directly via the
75 * kernel mapping. All of these *_lc functions can be removed then.
76 */
77
78/**
79 * put_guest_lc - write a simple variable to a guest vcpu's lowcore
80 * @vcpu: virtual cpu
81 * @x: value to copy to guest
82 * @gra: vcpu's destination guest real address
83 *
84 * Copies a simple value from kernel space to a guest vcpu's lowcore.
85 * The size of the variable may be 1, 2, 4 or 8 bytes. The destination
86 * must be located in the vcpu's lowcore. Otherwise the result is undefined.
87 *
88 * Returns zero on success or -EFAULT on error.
89 *
90 * Note: an error indicates that either the kernel is out of memory or
91 * the guest memory mapping is broken. In any case the best solution
92 * would be to terminate the guest.
93 * It is wrong to inject a guest exception.
94 */
95#define put_guest_lc(vcpu, x, gra) \
96({ \
97 struct kvm_vcpu *__vcpu = (vcpu); \
98 __typeof__(*(gra)) __x = (x); \
99 unsigned long __gpa; \
100 \
101 __gpa = (unsigned long)(gra); \
102 __gpa += kvm_s390_get_prefix(__vcpu); \
103 kvm_write_guest(__vcpu->kvm, __gpa, &__x, sizeof(__x)); \
104})
105
106/**
107 * write_guest_lc - copy data from kernel space to guest vcpu's lowcore
108 * @vcpu: virtual cpu
109 * @gra: vcpu's source guest real address
110 * @data: source address in kernel space
111 * @len: number of bytes to copy
112 *
113 * Copy data from kernel space to guest vcpu's lowcore. The entire range must
114 * be located within the vcpu's lowcore, otherwise the result is undefined.
115 *
116 * Returns zero on success or -EFAULT on error.
117 *
118 * Note: an error indicates that either the kernel is out of memory or
119 * the guest memory mapping is broken. In any case the best solution
120 * would be to terminate the guest.
121 * It is wrong to inject a guest exception.
122 */
123static inline __must_check
124int write_guest_lc(struct kvm_vcpu *vcpu, unsigned long gra, void *data,
125 unsigned long len)
126{
127 unsigned long gpa = gra + kvm_s390_get_prefix(vcpu);
128
129 return kvm_write_guest(vcpu->kvm, gpa, data, len);
130}
131
132/**
133 * read_guest_lc - copy data from guest vcpu's lowcore to kernel space
134 * @vcpu: virtual cpu
135 * @gra: vcpu's source guest real address
136 * @data: destination address in kernel space
137 * @len: number of bytes to copy
138 *
139 * Copy data from guest vcpu's lowcore to kernel space. The entire range must
140 * be located within the vcpu's lowcore, otherwise the result is undefined.
141 *
142 * Returns zero on success or -EFAULT on error.
143 *
144 * Note: an error indicates that either the kernel is out of memory or
145 * the guest memory mapping is broken. In any case the best solution
146 * would be to terminate the guest.
147 * It is wrong to inject a guest exception.
148 */
149static inline __must_check
150int read_guest_lc(struct kvm_vcpu *vcpu, unsigned long gra, void *data,
151 unsigned long len)
152{
153 unsigned long gpa = gra + kvm_s390_get_prefix(vcpu);
154
155 return kvm_read_guest(vcpu->kvm, gpa, data, len);
156}
157
158enum gacc_mode {
159 GACC_FETCH,
160 GACC_STORE,
161 GACC_IFETCH,
162};
163
164int guest_translate_address(struct kvm_vcpu *vcpu, unsigned long gva,
165 ar_t ar, unsigned long *gpa, enum gacc_mode mode);
166int check_gva_range(struct kvm_vcpu *vcpu, unsigned long gva, ar_t ar,
167 unsigned long length, enum gacc_mode mode);
168
169int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data,
170 unsigned long len, enum gacc_mode mode);
171
172int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra,
173 void *data, unsigned long len, enum gacc_mode mode);
174
175/**
176 * write_guest - copy data from kernel space to guest space
177 * @vcpu: virtual cpu
178 * @ga: guest address
179 * @ar: access register
180 * @data: source address in kernel space
181 * @len: number of bytes to copy
182 *
183 * Copy @len bytes from @data (kernel space) to @ga (guest address).
184 * In order to copy data to guest space the PSW of the vcpu is inspected:
185 * If DAT is off data will be copied to guest real or absolute memory.
186 * If DAT is on data will be copied to the address space as specified by
187 * the address space bits of the PSW:
188 * Primary, secondary, home space or access register mode.
189 * The addressing mode of the PSW is also inspected, so that address wrap
190 * around is taken into account for 24-, 31- and 64-bit addressing mode,
191 * if the to be copied data crosses page boundaries in guest address space.
192 * In addition also low address and DAT protection are inspected before
193 * copying any data (key protection is currently not implemented).
194 *
195 * This function modifies the 'struct kvm_s390_pgm_info pgm' member of @vcpu.
196 * In case of an access exception (e.g. protection exception) pgm will contain
197 * all data necessary so that a subsequent call to 'kvm_s390_inject_prog_vcpu()'
198 * will inject a correct exception into the guest.
199 * If no access exception happened, the contents of pgm are undefined when
200 * this function returns.
201 *
202 * Returns: - zero on success
203 * - a negative value if e.g. the guest mapping is broken or in
204 * case of out-of-memory. In this case the contents of pgm are
205 * undefined. Also parts of @data may have been copied to guest
206 * space.
207 * - a positive value if an access exception happened. In this case
208 * the returned value is the program interruption code and the
209 * contents of pgm may be used to inject an exception into the
210 * guest. No data has been copied to guest space.
211 *
212 * Note: in case an access exception is recognized no data has been copied to
213 * guest space (this is also true, if the to be copied data would cross
214 * one or more page boundaries in guest space).
215 * Therefore this function may be used for nullifying and suppressing
216 * instruction emulation.
217 * It may also be used for terminating instructions, if it is undefined
218 * if data has been changed in guest space in case of an exception.
219 */
220static inline __must_check
221int write_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data,
222 unsigned long len)
223{
224 return access_guest(vcpu, ga, ar, data, len, GACC_STORE);
225}
226
227/**
228 * read_guest - copy data from guest space to kernel space
229 * @vcpu: virtual cpu
230 * @ga: guest address
231 * @ar: access register
232 * @data: destination address in kernel space
233 * @len: number of bytes to copy
234 *
235 * Copy @len bytes from @ga (guest address) to @data (kernel space).
236 *
237 * The behaviour of read_guest is identical to write_guest, except that
238 * data will be copied from guest space to kernel space.
239 */
240static inline __must_check
241int read_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data,
242 unsigned long len)
243{
244 return access_guest(vcpu, ga, ar, data, len, GACC_FETCH);
245}
246
247/**
248 * read_guest_instr - copy instruction data from guest space to kernel space
249 * @vcpu: virtual cpu
250 * @data: destination address in kernel space
251 * @len: number of bytes to copy
252 *
253 * Copy @len bytes from the current psw address (guest space) to @data (kernel
254 * space).
255 *
256 * The behaviour of read_guest_instr is identical to read_guest, except that
257 * instruction data will be read from primary space when in home-space or
258 * address-space mode.
259 */
260static inline __must_check
261int read_guest_instr(struct kvm_vcpu *vcpu, void *data, unsigned long len)
262{
263 return access_guest(vcpu, vcpu->arch.sie_block->gpsw.addr, 0, data, len,
264 GACC_IFETCH);
265}
266
267/**
268 * write_guest_abs - copy data from kernel space to guest space absolute
269 * @vcpu: virtual cpu
270 * @gpa: guest physical (absolute) address
271 * @data: source address in kernel space
272 * @len: number of bytes to copy
273 *
274 * Copy @len bytes from @data (kernel space) to @gpa (guest absolute address).
275 * It is up to the caller to ensure that the entire guest memory range is
276 * valid memory before calling this function.
277 * Guest low address and key protection are not checked.
278 *
279 * Returns zero on success or -EFAULT on error.
280 *
281 * If an error occurs data may have been copied partially to guest memory.
282 */
283static inline __must_check
284int write_guest_abs(struct kvm_vcpu *vcpu, unsigned long gpa, void *data,
285 unsigned long len)
286{
287 return kvm_write_guest(vcpu->kvm, gpa, data, len);
288}
289
290/**
291 * read_guest_abs - copy data from guest space absolute to kernel space
292 * @vcpu: virtual cpu
293 * @gpa: guest physical (absolute) address
294 * @data: destination address in kernel space
295 * @len: number of bytes to copy
296 *
297 * Copy @len bytes from @gpa (guest absolute address) to @data (kernel space).
298 * It is up to the caller to ensure that the entire guest memory range is
299 * valid memory before calling this function.
300 * Guest key protection is not checked.
301 *
302 * Returns zero on success or -EFAULT on error.
303 *
304 * If an error occurs data may have been copied partially to kernel space.
305 */
306static inline __must_check
307int read_guest_abs(struct kvm_vcpu *vcpu, unsigned long gpa, void *data,
308 unsigned long len)
309{
310 return kvm_read_guest(vcpu->kvm, gpa, data, len);
311}
312
313/**
314 * write_guest_real - copy data from kernel space to guest space real
315 * @vcpu: virtual cpu
316 * @gra: guest real address
317 * @data: source address in kernel space
318 * @len: number of bytes to copy
319 *
320 * Copy @len bytes from @data (kernel space) to @gra (guest real address).
321 * It is up to the caller to ensure that the entire guest memory range is
322 * valid memory before calling this function.
323 * Guest low address and key protection are not checked.
324 *
325 * Returns zero on success or -EFAULT on error.
326 *
327 * If an error occurs data may have been copied partially to guest memory.
328 */
329static inline __must_check
330int write_guest_real(struct kvm_vcpu *vcpu, unsigned long gra, void *data,
331 unsigned long len)
332{
333 return access_guest_real(vcpu, gra, data, len, 1);
334}
335
336/**
337 * read_guest_real - copy data from guest space real to kernel space
338 * @vcpu: virtual cpu
339 * @gra: guest real address
340 * @data: destination address in kernel space
341 * @len: number of bytes to copy
342 *
343 * Copy @len bytes from @gra (guest real address) to @data (kernel space).
344 * It is up to the caller to ensure that the entire guest memory range is
345 * valid memory before calling this function.
346 * Guest key protection is not checked.
347 *
348 * Returns zero on success or -EFAULT on error.
349 *
350 * If an error occurs data may have been copied partially to kernel space.
351 */
352static inline __must_check
353int read_guest_real(struct kvm_vcpu *vcpu, unsigned long gra, void *data,
354 unsigned long len)
355{
356 return access_guest_real(vcpu, gra, data, len, 0);
357}
358
359void ipte_lock(struct kvm_vcpu *vcpu);
360void ipte_unlock(struct kvm_vcpu *vcpu);
361int ipte_lock_held(struct kvm_vcpu *vcpu);
362int kvm_s390_check_low_addr_prot_real(struct kvm_vcpu *vcpu, unsigned long gra);
363
364int kvm_s390_shadow_fault(struct kvm_vcpu *vcpu, struct gmap *shadow,
365 unsigned long saddr);
366
367#endif /* __KVM_S390_GACCESS_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * access guest memory
4 *
5 * Copyright IBM Corp. 2008, 2014
6 *
7 * Author(s): Carsten Otte <cotte@de.ibm.com>
8 */
9
10#ifndef __KVM_S390_GACCESS_H
11#define __KVM_S390_GACCESS_H
12
13#include <linux/compiler.h>
14#include <linux/kvm_host.h>
15#include <linux/uaccess.h>
16#include <linux/ptrace.h>
17#include "kvm-s390.h"
18
19/**
20 * kvm_s390_real_to_abs - convert guest real address to guest absolute address
21 * @vcpu - guest virtual cpu
22 * @gra - guest real address
23 *
24 * Returns the guest absolute address that corresponds to the passed guest real
25 * address @gra of a virtual guest cpu by applying its prefix.
26 */
27static inline unsigned long kvm_s390_real_to_abs(struct kvm_vcpu *vcpu,
28 unsigned long gra)
29{
30 unsigned long prefix = kvm_s390_get_prefix(vcpu);
31
32 if (gra < 2 * PAGE_SIZE)
33 gra += prefix;
34 else if (gra >= prefix && gra < prefix + 2 * PAGE_SIZE)
35 gra -= prefix;
36 return gra;
37}
38
39/**
40 * kvm_s390_logical_to_effective - convert guest logical to effective address
41 * @vcpu: guest virtual cpu
42 * @ga: guest logical address
43 *
44 * Convert a guest vcpu logical address to a guest vcpu effective address by
45 * applying the rules of the vcpu's addressing mode defined by PSW bits 31
46 * and 32 (extendended/basic addressing mode).
47 *
48 * Depending on the vcpu's addressing mode the upper 40 bits (24 bit addressing
49 * mode), 33 bits (31 bit addressing mode) or no bits (64 bit addressing mode)
50 * of @ga will be zeroed and the remaining bits will be returned.
51 */
52static inline unsigned long kvm_s390_logical_to_effective(struct kvm_vcpu *vcpu,
53 unsigned long ga)
54{
55 psw_t *psw = &vcpu->arch.sie_block->gpsw;
56
57 if (psw_bits(*psw).eaba == PSW_BITS_AMODE_64BIT)
58 return ga;
59 if (psw_bits(*psw).eaba == PSW_BITS_AMODE_31BIT)
60 return ga & ((1UL << 31) - 1);
61 return ga & ((1UL << 24) - 1);
62}
63
64/*
65 * put_guest_lc, read_guest_lc and write_guest_lc are guest access functions
66 * which shall only be used to access the lowcore of a vcpu.
67 * These functions should be used for e.g. interrupt handlers where no
68 * guest memory access protection facilities, like key or low address
69 * protection, are applicable.
70 * At a later point guest vcpu lowcore access should happen via pinned
71 * prefix pages, so that these pages can be accessed directly via the
72 * kernel mapping. All of these *_lc functions can be removed then.
73 */
74
75/**
76 * put_guest_lc - write a simple variable to a guest vcpu's lowcore
77 * @vcpu: virtual cpu
78 * @x: value to copy to guest
79 * @gra: vcpu's destination guest real address
80 *
81 * Copies a simple value from kernel space to a guest vcpu's lowcore.
82 * The size of the variable may be 1, 2, 4 or 8 bytes. The destination
83 * must be located in the vcpu's lowcore. Otherwise the result is undefined.
84 *
85 * Returns zero on success or -EFAULT on error.
86 *
87 * Note: an error indicates that either the kernel is out of memory or
88 * the guest memory mapping is broken. In any case the best solution
89 * would be to terminate the guest.
90 * It is wrong to inject a guest exception.
91 */
92#define put_guest_lc(vcpu, x, gra) \
93({ \
94 struct kvm_vcpu *__vcpu = (vcpu); \
95 __typeof__(*(gra)) __x = (x); \
96 unsigned long __gpa; \
97 \
98 __gpa = (unsigned long)(gra); \
99 __gpa += kvm_s390_get_prefix(__vcpu); \
100 kvm_write_guest(__vcpu->kvm, __gpa, &__x, sizeof(__x)); \
101})
102
103/**
104 * write_guest_lc - copy data from kernel space to guest vcpu's lowcore
105 * @vcpu: virtual cpu
106 * @gra: vcpu's source guest real address
107 * @data: source address in kernel space
108 * @len: number of bytes to copy
109 *
110 * Copy data from kernel space to guest vcpu's lowcore. The entire range must
111 * be located within the vcpu's lowcore, otherwise the result is undefined.
112 *
113 * Returns zero on success or -EFAULT on error.
114 *
115 * Note: an error indicates that either the kernel is out of memory or
116 * the guest memory mapping is broken. In any case the best solution
117 * would be to terminate the guest.
118 * It is wrong to inject a guest exception.
119 */
120static inline __must_check
121int write_guest_lc(struct kvm_vcpu *vcpu, unsigned long gra, void *data,
122 unsigned long len)
123{
124 unsigned long gpa = gra + kvm_s390_get_prefix(vcpu);
125
126 return kvm_write_guest(vcpu->kvm, gpa, data, len);
127}
128
129/**
130 * read_guest_lc - copy data from guest vcpu's lowcore to kernel space
131 * @vcpu: virtual cpu
132 * @gra: vcpu's source guest real address
133 * @data: destination address in kernel space
134 * @len: number of bytes to copy
135 *
136 * Copy data from guest vcpu's lowcore to kernel space. The entire range must
137 * be located within the vcpu's lowcore, otherwise the result is undefined.
138 *
139 * Returns zero on success or -EFAULT on error.
140 *
141 * Note: an error indicates that either the kernel is out of memory or
142 * the guest memory mapping is broken. In any case the best solution
143 * would be to terminate the guest.
144 * It is wrong to inject a guest exception.
145 */
146static inline __must_check
147int read_guest_lc(struct kvm_vcpu *vcpu, unsigned long gra, void *data,
148 unsigned long len)
149{
150 unsigned long gpa = gra + kvm_s390_get_prefix(vcpu);
151
152 return kvm_read_guest(vcpu->kvm, gpa, data, len);
153}
154
155enum gacc_mode {
156 GACC_FETCH,
157 GACC_STORE,
158 GACC_IFETCH,
159};
160
161int guest_translate_address(struct kvm_vcpu *vcpu, unsigned long gva,
162 u8 ar, unsigned long *gpa, enum gacc_mode mode);
163int check_gva_range(struct kvm_vcpu *vcpu, unsigned long gva, u8 ar,
164 unsigned long length, enum gacc_mode mode);
165
166int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, void *data,
167 unsigned long len, enum gacc_mode mode);
168
169int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra,
170 void *data, unsigned long len, enum gacc_mode mode);
171
172/**
173 * write_guest - copy data from kernel space to guest space
174 * @vcpu: virtual cpu
175 * @ga: guest address
176 * @ar: access register
177 * @data: source address in kernel space
178 * @len: number of bytes to copy
179 *
180 * Copy @len bytes from @data (kernel space) to @ga (guest address).
181 * In order to copy data to guest space the PSW of the vcpu is inspected:
182 * If DAT is off data will be copied to guest real or absolute memory.
183 * If DAT is on data will be copied to the address space as specified by
184 * the address space bits of the PSW:
185 * Primary, secondary, home space or access register mode.
186 * The addressing mode of the PSW is also inspected, so that address wrap
187 * around is taken into account for 24-, 31- and 64-bit addressing mode,
188 * if the to be copied data crosses page boundaries in guest address space.
189 * In addition also low address and DAT protection are inspected before
190 * copying any data (key protection is currently not implemented).
191 *
192 * This function modifies the 'struct kvm_s390_pgm_info pgm' member of @vcpu.
193 * In case of an access exception (e.g. protection exception) pgm will contain
194 * all data necessary so that a subsequent call to 'kvm_s390_inject_prog_vcpu()'
195 * will inject a correct exception into the guest.
196 * If no access exception happened, the contents of pgm are undefined when
197 * this function returns.
198 *
199 * Returns: - zero on success
200 * - a negative value if e.g. the guest mapping is broken or in
201 * case of out-of-memory. In this case the contents of pgm are
202 * undefined. Also parts of @data may have been copied to guest
203 * space.
204 * - a positive value if an access exception happened. In this case
205 * the returned value is the program interruption code and the
206 * contents of pgm may be used to inject an exception into the
207 * guest. No data has been copied to guest space.
208 *
209 * Note: in case an access exception is recognized no data has been copied to
210 * guest space (this is also true, if the to be copied data would cross
211 * one or more page boundaries in guest space).
212 * Therefore this function may be used for nullifying and suppressing
213 * instruction emulation.
214 * It may also be used for terminating instructions, if it is undefined
215 * if data has been changed in guest space in case of an exception.
216 */
217static inline __must_check
218int write_guest(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, void *data,
219 unsigned long len)
220{
221 return access_guest(vcpu, ga, ar, data, len, GACC_STORE);
222}
223
224/**
225 * read_guest - copy data from guest space to kernel space
226 * @vcpu: virtual cpu
227 * @ga: guest address
228 * @ar: access register
229 * @data: destination address in kernel space
230 * @len: number of bytes to copy
231 *
232 * Copy @len bytes from @ga (guest address) to @data (kernel space).
233 *
234 * The behaviour of read_guest is identical to write_guest, except that
235 * data will be copied from guest space to kernel space.
236 */
237static inline __must_check
238int read_guest(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, void *data,
239 unsigned long len)
240{
241 return access_guest(vcpu, ga, ar, data, len, GACC_FETCH);
242}
243
244/**
245 * read_guest_instr - copy instruction data from guest space to kernel space
246 * @vcpu: virtual cpu
247 * @ga: guest address
248 * @data: destination address in kernel space
249 * @len: number of bytes to copy
250 *
251 * Copy @len bytes from the given address (guest space) to @data (kernel
252 * space).
253 *
254 * The behaviour of read_guest_instr is identical to read_guest, except that
255 * instruction data will be read from primary space when in home-space or
256 * address-space mode.
257 */
258static inline __must_check
259int read_guest_instr(struct kvm_vcpu *vcpu, unsigned long ga, void *data,
260 unsigned long len)
261{
262 return access_guest(vcpu, ga, 0, data, len, GACC_IFETCH);
263}
264
265/**
266 * write_guest_abs - copy data from kernel space to guest space absolute
267 * @vcpu: virtual cpu
268 * @gpa: guest physical (absolute) address
269 * @data: source address in kernel space
270 * @len: number of bytes to copy
271 *
272 * Copy @len bytes from @data (kernel space) to @gpa (guest absolute address).
273 * It is up to the caller to ensure that the entire guest memory range is
274 * valid memory before calling this function.
275 * Guest low address and key protection are not checked.
276 *
277 * Returns zero on success or -EFAULT on error.
278 *
279 * If an error occurs data may have been copied partially to guest memory.
280 */
281static inline __must_check
282int write_guest_abs(struct kvm_vcpu *vcpu, unsigned long gpa, void *data,
283 unsigned long len)
284{
285 return kvm_write_guest(vcpu->kvm, gpa, data, len);
286}
287
288/**
289 * read_guest_abs - copy data from guest space absolute to kernel space
290 * @vcpu: virtual cpu
291 * @gpa: guest physical (absolute) address
292 * @data: destination address in kernel space
293 * @len: number of bytes to copy
294 *
295 * Copy @len bytes from @gpa (guest absolute address) to @data (kernel space).
296 * It is up to the caller to ensure that the entire guest memory range is
297 * valid memory before calling this function.
298 * Guest key protection is not checked.
299 *
300 * Returns zero on success or -EFAULT on error.
301 *
302 * If an error occurs data may have been copied partially to kernel space.
303 */
304static inline __must_check
305int read_guest_abs(struct kvm_vcpu *vcpu, unsigned long gpa, void *data,
306 unsigned long len)
307{
308 return kvm_read_guest(vcpu->kvm, gpa, data, len);
309}
310
311/**
312 * write_guest_real - copy data from kernel space to guest space real
313 * @vcpu: virtual cpu
314 * @gra: guest real address
315 * @data: source address in kernel space
316 * @len: number of bytes to copy
317 *
318 * Copy @len bytes from @data (kernel space) to @gra (guest real address).
319 * It is up to the caller to ensure that the entire guest memory range is
320 * valid memory before calling this function.
321 * Guest low address and key protection are not checked.
322 *
323 * Returns zero on success or -EFAULT on error.
324 *
325 * If an error occurs data may have been copied partially to guest memory.
326 */
327static inline __must_check
328int write_guest_real(struct kvm_vcpu *vcpu, unsigned long gra, void *data,
329 unsigned long len)
330{
331 return access_guest_real(vcpu, gra, data, len, 1);
332}
333
334/**
335 * read_guest_real - copy data from guest space real to kernel space
336 * @vcpu: virtual cpu
337 * @gra: guest real address
338 * @data: destination address in kernel space
339 * @len: number of bytes to copy
340 *
341 * Copy @len bytes from @gra (guest real address) to @data (kernel space).
342 * It is up to the caller to ensure that the entire guest memory range is
343 * valid memory before calling this function.
344 * Guest key protection is not checked.
345 *
346 * Returns zero on success or -EFAULT on error.
347 *
348 * If an error occurs data may have been copied partially to kernel space.
349 */
350static inline __must_check
351int read_guest_real(struct kvm_vcpu *vcpu, unsigned long gra, void *data,
352 unsigned long len)
353{
354 return access_guest_real(vcpu, gra, data, len, 0);
355}
356
357void ipte_lock(struct kvm_vcpu *vcpu);
358void ipte_unlock(struct kvm_vcpu *vcpu);
359int ipte_lock_held(struct kvm_vcpu *vcpu);
360int kvm_s390_check_low_addr_prot_real(struct kvm_vcpu *vcpu, unsigned long gra);
361
362int kvm_s390_shadow_fault(struct kvm_vcpu *vcpu, struct gmap *shadow,
363 unsigned long saddr);
364
365#endif /* __KVM_S390_GACCESS_H */