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TOMOYO Linux Cross Reference
Linux/arch/s390/kvm/kvm-s390.h

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  1 /*
  2  * definition for kvm on s390
  3  *
  4  * Copyright IBM Corp. 2008, 2009
  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  *               Christian Borntraeger <borntraeger@de.ibm.com>
 12  *               Christian Ehrhardt <ehrhardt@de.ibm.com>
 13  */
 14 
 15 #ifndef ARCH_S390_KVM_S390_H
 16 #define ARCH_S390_KVM_S390_H
 17 
 18 #include <linux/hrtimer.h>
 19 #include <linux/kvm.h>
 20 #include <linux/kvm_host.h>
 21 #include <asm/facility.h>
 22 #include <asm/processor.h>
 23 
 24 typedef int (*intercept_handler_t)(struct kvm_vcpu *vcpu);
 25 
 26 /* Transactional Memory Execution related macros */
 27 #define IS_TE_ENABLED(vcpu)     ((vcpu->arch.sie_block->ecb & 0x10))
 28 #define TDB_FORMAT1             1
 29 #define IS_ITDB_VALID(vcpu)     ((*(char *)vcpu->arch.sie_block->itdba == TDB_FORMAT1))
 30 
 31 extern debug_info_t *kvm_s390_dbf;
 32 #define KVM_EVENT(d_loglevel, d_string, d_args...)\
 33 do { \
 34         debug_sprintf_event(kvm_s390_dbf, d_loglevel, d_string "\n", \
 35           d_args); \
 36 } while (0)
 37 
 38 #define VM_EVENT(d_kvm, d_loglevel, d_string, d_args...)\
 39 do { \
 40         debug_sprintf_event(d_kvm->arch.dbf, d_loglevel, d_string "\n", \
 41           d_args); \
 42 } while (0)
 43 
 44 #define VCPU_EVENT(d_vcpu, d_loglevel, d_string, d_args...)\
 45 do { \
 46         debug_sprintf_event(d_vcpu->kvm->arch.dbf, d_loglevel, \
 47           "%02d[%016lx-%016lx]: " d_string "\n", d_vcpu->vcpu_id, \
 48           d_vcpu->arch.sie_block->gpsw.mask, d_vcpu->arch.sie_block->gpsw.addr,\
 49           d_args); \
 50 } while (0)
 51 
 52 static inline int is_vcpu_stopped(struct kvm_vcpu *vcpu)
 53 {
 54         return atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_STOPPED;
 55 }
 56 
 57 static inline int is_vcpu_idle(struct kvm_vcpu *vcpu)
 58 {
 59         return test_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 60 }
 61 
 62 static inline int kvm_is_ucontrol(struct kvm *kvm)
 63 {
 64 #ifdef CONFIG_KVM_S390_UCONTROL
 65         if (kvm->arch.gmap)
 66                 return 0;
 67         return 1;
 68 #else
 69         return 0;
 70 #endif
 71 }
 72 
 73 #define GUEST_PREFIX_SHIFT 13
 74 static inline u32 kvm_s390_get_prefix(struct kvm_vcpu *vcpu)
 75 {
 76         return vcpu->arch.sie_block->prefix << GUEST_PREFIX_SHIFT;
 77 }
 78 
 79 static inline void kvm_s390_set_prefix(struct kvm_vcpu *vcpu, u32 prefix)
 80 {
 81         VCPU_EVENT(vcpu, 3, "set prefix of cpu %03u to 0x%x", vcpu->vcpu_id,
 82                    prefix);
 83         vcpu->arch.sie_block->prefix = prefix >> GUEST_PREFIX_SHIFT;
 84         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
 85         kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
 86 }
 87 
 88 typedef u8 __bitwise ar_t;
 89 
 90 static inline u64 kvm_s390_get_base_disp_s(struct kvm_vcpu *vcpu, ar_t *ar)
 91 {
 92         u32 base2 = vcpu->arch.sie_block->ipb >> 28;
 93         u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
 94 
 95         if (ar)
 96                 *ar = base2;
 97 
 98         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
 99 }
100 
101 static inline void kvm_s390_get_base_disp_sse(struct kvm_vcpu *vcpu,
102                                               u64 *address1, u64 *address2,
103                                               ar_t *ar_b1, ar_t *ar_b2)
104 {
105         u32 base1 = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
106         u32 disp1 = (vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16;
107         u32 base2 = (vcpu->arch.sie_block->ipb & 0xf000) >> 12;
108         u32 disp2 = vcpu->arch.sie_block->ipb & 0x0fff;
109 
110         *address1 = (base1 ? vcpu->run->s.regs.gprs[base1] : 0) + disp1;
111         *address2 = (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
112 
113         if (ar_b1)
114                 *ar_b1 = base1;
115         if (ar_b2)
116                 *ar_b2 = base2;
117 }
118 
119 static inline void kvm_s390_get_regs_rre(struct kvm_vcpu *vcpu, int *r1, int *r2)
120 {
121         if (r1)
122                 *r1 = (vcpu->arch.sie_block->ipb & 0x00f00000) >> 20;
123         if (r2)
124                 *r2 = (vcpu->arch.sie_block->ipb & 0x000f0000) >> 16;
125 }
126 
127 static inline u64 kvm_s390_get_base_disp_rsy(struct kvm_vcpu *vcpu, ar_t *ar)
128 {
129         u32 base2 = vcpu->arch.sie_block->ipb >> 28;
130         u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16) +
131                         ((vcpu->arch.sie_block->ipb & 0xff00) << 4);
132         /* The displacement is a 20bit _SIGNED_ value */
133         if (disp2 & 0x80000)
134                 disp2+=0xfff00000;
135 
136         if (ar)
137                 *ar = base2;
138 
139         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + (long)(int)disp2;
140 }
141 
142 static inline u64 kvm_s390_get_base_disp_rs(struct kvm_vcpu *vcpu, ar_t *ar)
143 {
144         u32 base2 = vcpu->arch.sie_block->ipb >> 28;
145         u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
146 
147         if (ar)
148                 *ar = base2;
149 
150         return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
151 }
152 
153 /* Set the condition code in the guest program status word */
154 static inline void kvm_s390_set_psw_cc(struct kvm_vcpu *vcpu, unsigned long cc)
155 {
156         vcpu->arch.sie_block->gpsw.mask &= ~(3UL << 44);
157         vcpu->arch.sie_block->gpsw.mask |= cc << 44;
158 }
159 
160 /* test availability of facility in a kvm instance */
161 static inline int test_kvm_facility(struct kvm *kvm, unsigned long nr)
162 {
163         return __test_facility(nr, kvm->arch.model.fac_mask) &&
164                 __test_facility(nr, kvm->arch.model.fac_list);
165 }
166 
167 static inline int set_kvm_facility(u64 *fac_list, unsigned long nr)
168 {
169         unsigned char *ptr;
170 
171         if (nr >= MAX_FACILITY_BIT)
172                 return -EINVAL;
173         ptr = (unsigned char *) fac_list + (nr >> 3);
174         *ptr |= (0x80UL >> (nr & 7));
175         return 0;
176 }
177 
178 static inline int test_kvm_cpu_feat(struct kvm *kvm, unsigned long nr)
179 {
180         WARN_ON_ONCE(nr >= KVM_S390_VM_CPU_FEAT_NR_BITS);
181         return test_bit_inv(nr, kvm->arch.cpu_feat);
182 }
183 
184 /* are cpu states controlled by user space */
185 static inline int kvm_s390_user_cpu_state_ctrl(struct kvm *kvm)
186 {
187         return kvm->arch.user_cpu_state_ctrl != 0;
188 }
189 
190 /* implemented in interrupt.c */
191 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu);
192 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu);
193 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer);
194 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu);
195 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu);
196 void kvm_s390_clear_float_irqs(struct kvm *kvm);
197 int __must_check kvm_s390_inject_vm(struct kvm *kvm,
198                                     struct kvm_s390_interrupt *s390int);
199 int __must_check kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
200                                       struct kvm_s390_irq *irq);
201 static inline int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
202                                            struct kvm_s390_pgm_info *pgm_info)
203 {
204         struct kvm_s390_irq irq = {
205                 .type = KVM_S390_PROGRAM_INT,
206                 .u.pgm = *pgm_info,
207         };
208 
209         return kvm_s390_inject_vcpu(vcpu, &irq);
210 }
211 static inline int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
212 {
213         struct kvm_s390_irq irq = {
214                 .type = KVM_S390_PROGRAM_INT,
215                 .u.pgm.code = code,
216         };
217 
218         return kvm_s390_inject_vcpu(vcpu, &irq);
219 }
220 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
221                                                     u64 isc_mask, u32 schid);
222 int kvm_s390_reinject_io_int(struct kvm *kvm,
223                              struct kvm_s390_interrupt_info *inti);
224 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked);
225 
226 /* implemented in intercept.c */
227 u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu);
228 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu);
229 static inline void kvm_s390_rewind_psw(struct kvm_vcpu *vcpu, int ilen)
230 {
231         struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
232 
233         sie_block->gpsw.addr = __rewind_psw(sie_block->gpsw, ilen);
234 }
235 static inline void kvm_s390_forward_psw(struct kvm_vcpu *vcpu, int ilen)
236 {
237         kvm_s390_rewind_psw(vcpu, -ilen);
238 }
239 static inline void kvm_s390_retry_instr(struct kvm_vcpu *vcpu)
240 {
241         /* don't inject PER events if we re-execute the instruction */
242         vcpu->arch.sie_block->icptstatus &= ~0x02;
243         kvm_s390_rewind_psw(vcpu, kvm_s390_get_ilen(vcpu));
244 }
245 
246 /* implemented in priv.c */
247 int is_valid_psw(psw_t *psw);
248 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu);
249 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu);
250 int kvm_s390_handle_01(struct kvm_vcpu *vcpu);
251 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu);
252 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu);
253 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu);
254 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu);
255 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu);
256 
257 /* implemented in vsie.c */
258 int kvm_s390_handle_vsie(struct kvm_vcpu *vcpu);
259 void kvm_s390_vsie_kick(struct kvm_vcpu *vcpu);
260 void kvm_s390_vsie_gmap_notifier(struct gmap *gmap, unsigned long start,
261                                  unsigned long end);
262 void kvm_s390_vsie_init(struct kvm *kvm);
263 void kvm_s390_vsie_destroy(struct kvm *kvm);
264 
265 /* implemented in sigp.c */
266 int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu);
267 int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu);
268 
269 /* implemented in sthyi.c */
270 int handle_sthyi(struct kvm_vcpu *vcpu);
271 
272 /* implemented in kvm-s390.c */
273 void kvm_s390_set_tod_clock(struct kvm *kvm, u64 tod);
274 long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable);
275 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long addr);
276 int kvm_s390_store_adtl_status_unloaded(struct kvm_vcpu *vcpu,
277                                         unsigned long addr);
278 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr);
279 int kvm_s390_vcpu_store_adtl_status(struct kvm_vcpu *vcpu, unsigned long addr);
280 void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu);
281 void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu);
282 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu);
283 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu);
284 void exit_sie(struct kvm_vcpu *vcpu);
285 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu);
286 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu);
287 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu);
288 unsigned long kvm_s390_fac_list_mask_size(void);
289 extern unsigned long kvm_s390_fac_list_mask[];
290 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm);
291 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu);
292 
293 /* implemented in diag.c */
294 int kvm_s390_handle_diag(struct kvm_vcpu *vcpu);
295 
296 static inline void kvm_s390_vcpu_block_all(struct kvm *kvm)
297 {
298         int i;
299         struct kvm_vcpu *vcpu;
300 
301         WARN_ON(!mutex_is_locked(&kvm->lock));
302         kvm_for_each_vcpu(i, vcpu, kvm)
303                 kvm_s390_vcpu_block(vcpu);
304 }
305 
306 static inline void kvm_s390_vcpu_unblock_all(struct kvm *kvm)
307 {
308         int i;
309         struct kvm_vcpu *vcpu;
310 
311         kvm_for_each_vcpu(i, vcpu, kvm)
312                 kvm_s390_vcpu_unblock(vcpu);
313 }
314 
315 static inline u64 kvm_s390_get_tod_clock_fast(struct kvm *kvm)
316 {
317         u64 rc;
318 
319         preempt_disable();
320         rc = get_tod_clock_fast() + kvm->arch.epoch;
321         preempt_enable();
322         return rc;
323 }
324 
325 /**
326  * kvm_s390_inject_prog_cond - conditionally inject a program check
327  * @vcpu: virtual cpu
328  * @rc: original return/error code
329  *
330  * This function is supposed to be used after regular guest access functions
331  * failed, to conditionally inject a program check to a vcpu. The typical
332  * pattern would look like
333  *
334  * rc = write_guest(vcpu, addr, data, len);
335  * if (rc)
336  *      return kvm_s390_inject_prog_cond(vcpu, rc);
337  *
338  * A negative return code from guest access functions implies an internal error
339  * like e.g. out of memory. In these cases no program check should be injected
340  * to the guest.
341  * A positive value implies that an exception happened while accessing a guest's
342  * memory. In this case all data belonging to the corresponding program check
343  * has been stored in vcpu->arch.pgm and can be injected with
344  * kvm_s390_inject_prog_irq().
345  *
346  * Returns: - the original @rc value if @rc was negative (internal error)
347  *          - zero if @rc was already zero
348  *          - zero or error code from injecting if @rc was positive
349  *            (program check injected to @vcpu)
350  */
351 static inline int kvm_s390_inject_prog_cond(struct kvm_vcpu *vcpu, int rc)
352 {
353         if (rc <= 0)
354                 return rc;
355         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
356 }
357 
358 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
359                         struct kvm_s390_irq *s390irq);
360 
361 /* implemented in interrupt.c */
362 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop);
363 int psw_extint_disabled(struct kvm_vcpu *vcpu);
364 void kvm_s390_destroy_adapters(struct kvm *kvm);
365 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu);
366 extern struct kvm_device_ops kvm_flic_ops;
367 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu);
368 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu);
369 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu,
370                            void __user *buf, int len);
371 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu,
372                            __u8 __user *buf, int len);
373 
374 /* implemented in guestdbg.c */
375 void kvm_s390_backup_guest_per_regs(struct kvm_vcpu *vcpu);
376 void kvm_s390_restore_guest_per_regs(struct kvm_vcpu *vcpu);
377 void kvm_s390_patch_guest_per_regs(struct kvm_vcpu *vcpu);
378 int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu,
379                             struct kvm_guest_debug *dbg);
380 void kvm_s390_clear_bp_data(struct kvm_vcpu *vcpu);
381 void kvm_s390_prepare_debug_exit(struct kvm_vcpu *vcpu);
382 int kvm_s390_handle_per_ifetch_icpt(struct kvm_vcpu *vcpu);
383 void kvm_s390_handle_per_event(struct kvm_vcpu *vcpu);
384 
385 /* support for Basic/Extended SCA handling */
386 static inline union ipte_control *kvm_s390_get_ipte_control(struct kvm *kvm)
387 {
388         struct bsca_block *sca = kvm->arch.sca; /* SCA version doesn't matter */
389 
390         return &sca->ipte_control;
391 }
392 #endif
393 

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