1 /*
2  * handling kvm guest interrupts
3  *
4  * Copyright IBM Corp. 2008, 2015
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 #include <linux/interrupt.h>
14 #include <linux/kvm_host.h>
15 #include <linux/hrtimer.h>
16 #include <linux/mmu_context.h>
17 #include <linux/signal.h>
18 #include <linux/slab.h>
19 #include <linux/bitmap.h>
20 #include <linux/vmalloc.h>
21 #include <asm/asm-offsets.h>
22 #include <asm/dis.h>
23 #include <asm/uaccess.h>
24 #include <asm/sclp.h>
25 #include <asm/isc.h>
26 #include "kvm-s390.h"
27 #include "gaccess.h"
28 #include "trace-s390.h"
29 
30 #define IOINT_SCHID_MASK 0x0000ffff
31 #define IOINT_SSID_MASK 0x00030000
32 #define IOINT_CSSID_MASK 0x03fc0000
33 #define IOINT_AI_MASK 0x04000000
34 #define PFAULT_INIT 0x0600
35 #define PFAULT_DONE 0x0680
36 #define VIRTIO_PARAM 0x0d00
37 
psw_extint_disabled(struct kvm_vcpu * vcpu)38 int psw_extint_disabled(struct kvm_vcpu *vcpu)
39 {
40 	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
41 }
42 
psw_ioint_disabled(struct kvm_vcpu * vcpu)43 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
44 {
45 	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
46 }
47 
psw_mchk_disabled(struct kvm_vcpu * vcpu)48 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
49 {
50 	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
51 }
52 
psw_interrupts_disabled(struct kvm_vcpu * vcpu)53 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
54 {
55 	if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
56 	    (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
57 	    (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
58 		return 0;
59 	return 1;
60 }
61 
ckc_interrupts_enabled(struct kvm_vcpu * vcpu)62 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
63 {
64 	if (psw_extint_disabled(vcpu) ||
65 	    !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
66 		return 0;
67 	if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
68 		/* No timer interrupts when single stepping */
69 		return 0;
70 	return 1;
71 }
72 
ckc_irq_pending(struct kvm_vcpu * vcpu)73 static int ckc_irq_pending(struct kvm_vcpu *vcpu)
74 {
75 	if (!(vcpu->arch.sie_block->ckc <
76 	      get_tod_clock_fast() + vcpu->arch.sie_block->epoch))
77 		return 0;
78 	return ckc_interrupts_enabled(vcpu);
79 }
80 
cpu_timer_interrupts_enabled(struct kvm_vcpu * vcpu)81 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
82 {
83 	return !psw_extint_disabled(vcpu) &&
84 	       (vcpu->arch.sie_block->gcr[0] & 0x400ul);
85 }
86 
cpu_timer_irq_pending(struct kvm_vcpu * vcpu)87 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
88 {
89 	return (vcpu->arch.sie_block->cputm >> 63) &&
90 	       cpu_timer_interrupts_enabled(vcpu);
91 }
92 
is_ioirq(unsigned long irq_type)93 static inline int is_ioirq(unsigned long irq_type)
94 {
95 	return ((irq_type >= IRQ_PEND_IO_ISC_0) &&
96 		(irq_type <= IRQ_PEND_IO_ISC_7));
97 }
98 
isc_to_isc_bits(int isc)99 static uint64_t isc_to_isc_bits(int isc)
100 {
101 	return (0x80 >> isc) << 24;
102 }
103 
int_word_to_isc(u32 int_word)104 static inline u8 int_word_to_isc(u32 int_word)
105 {
106 	return (int_word & 0x38000000) >> 27;
107 }
108 
pending_floating_irqs(struct kvm_vcpu * vcpu)109 static inline unsigned long pending_floating_irqs(struct kvm_vcpu *vcpu)
110 {
111 	return vcpu->kvm->arch.float_int.pending_irqs;
112 }
113 
pending_local_irqs(struct kvm_vcpu * vcpu)114 static inline unsigned long pending_local_irqs(struct kvm_vcpu *vcpu)
115 {
116 	return vcpu->arch.local_int.pending_irqs;
117 }
118 
disable_iscs(struct kvm_vcpu * vcpu,unsigned long active_mask)119 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
120 				   unsigned long active_mask)
121 {
122 	int i;
123 
124 	for (i = 0; i <= MAX_ISC; i++)
125 		if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
126 			active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i));
127 
128 	return active_mask;
129 }
130 
deliverable_irqs(struct kvm_vcpu * vcpu)131 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
132 {
133 	unsigned long active_mask;
134 
135 	active_mask = pending_local_irqs(vcpu);
136 	active_mask |= pending_floating_irqs(vcpu);
137 
138 	if (psw_extint_disabled(vcpu))
139 		active_mask &= ~IRQ_PEND_EXT_MASK;
140 	if (psw_ioint_disabled(vcpu))
141 		active_mask &= ~IRQ_PEND_IO_MASK;
142 	else
143 		active_mask = disable_iscs(vcpu, active_mask);
144 	if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
145 		__clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
146 	if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
147 		__clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
148 	if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
149 		__clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
150 	if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
151 		__clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
152 	if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
153 		__clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
154 	if (psw_mchk_disabled(vcpu))
155 		active_mask &= ~IRQ_PEND_MCHK_MASK;
156 	if (!(vcpu->arch.sie_block->gcr[14] &
157 	      vcpu->kvm->arch.float_int.mchk.cr14))
158 		__clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
159 
160 	/*
161 	 * STOP irqs will never be actively delivered. They are triggered via
162 	 * intercept requests and cleared when the stop intercept is performed.
163 	 */
164 	__clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
165 
166 	return active_mask;
167 }
168 
__set_cpu_idle(struct kvm_vcpu * vcpu)169 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
170 {
171 	atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
172 	set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
173 }
174 
__unset_cpu_idle(struct kvm_vcpu * vcpu)175 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
176 {
177 	atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
178 	clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
179 }
180 
__reset_intercept_indicators(struct kvm_vcpu * vcpu)181 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
182 {
183 	atomic_clear_mask(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
184 			  &vcpu->arch.sie_block->cpuflags);
185 	vcpu->arch.sie_block->lctl = 0x0000;
186 	vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
187 
188 	if (guestdbg_enabled(vcpu)) {
189 		vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
190 					       LCTL_CR10 | LCTL_CR11);
191 		vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
192 	}
193 }
194 
__set_cpuflag(struct kvm_vcpu * vcpu,u32 flag)195 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
196 {
197 	atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
198 }
199 
set_intercept_indicators_io(struct kvm_vcpu * vcpu)200 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
201 {
202 	if (!(pending_floating_irqs(vcpu) & IRQ_PEND_IO_MASK))
203 		return;
204 	else if (psw_ioint_disabled(vcpu))
205 		__set_cpuflag(vcpu, CPUSTAT_IO_INT);
206 	else
207 		vcpu->arch.sie_block->lctl |= LCTL_CR6;
208 }
209 
set_intercept_indicators_ext(struct kvm_vcpu * vcpu)210 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
211 {
212 	if (!(pending_local_irqs(vcpu) & IRQ_PEND_EXT_MASK))
213 		return;
214 	if (psw_extint_disabled(vcpu))
215 		__set_cpuflag(vcpu, CPUSTAT_EXT_INT);
216 	else
217 		vcpu->arch.sie_block->lctl |= LCTL_CR0;
218 }
219 
set_intercept_indicators_mchk(struct kvm_vcpu * vcpu)220 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
221 {
222 	if (!(pending_local_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
223 		return;
224 	if (psw_mchk_disabled(vcpu))
225 		vcpu->arch.sie_block->ictl |= ICTL_LPSW;
226 	else
227 		vcpu->arch.sie_block->lctl |= LCTL_CR14;
228 }
229 
set_intercept_indicators_stop(struct kvm_vcpu * vcpu)230 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
231 {
232 	if (kvm_s390_is_stop_irq_pending(vcpu))
233 		__set_cpuflag(vcpu, CPUSTAT_STOP_INT);
234 }
235 
236 /* Set interception request for non-deliverable interrupts */
set_intercept_indicators(struct kvm_vcpu * vcpu)237 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
238 {
239 	set_intercept_indicators_io(vcpu);
240 	set_intercept_indicators_ext(vcpu);
241 	set_intercept_indicators_mchk(vcpu);
242 	set_intercept_indicators_stop(vcpu);
243 }
244 
get_ilc(struct kvm_vcpu * vcpu)245 static u16 get_ilc(struct kvm_vcpu *vcpu)
246 {
247 	switch (vcpu->arch.sie_block->icptcode) {
248 	case ICPT_INST:
249 	case ICPT_INSTPROGI:
250 	case ICPT_OPEREXC:
251 	case ICPT_PARTEXEC:
252 	case ICPT_IOINST:
253 		/* last instruction only stored for these icptcodes */
254 		return insn_length(vcpu->arch.sie_block->ipa >> 8);
255 	case ICPT_PROGI:
256 		return vcpu->arch.sie_block->pgmilc;
257 	default:
258 		return 0;
259 	}
260 }
261 
__deliver_cpu_timer(struct kvm_vcpu * vcpu)262 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
263 {
264 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
265 	int rc;
266 
267 	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
268 					 0, 0);
269 
270 	rc  = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
271 			   (u16 *)__LC_EXT_INT_CODE);
272 	rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
273 	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
274 			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
275 	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
276 			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
277 	clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
278 	return rc ? -EFAULT : 0;
279 }
280 
__deliver_ckc(struct kvm_vcpu * vcpu)281 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
282 {
283 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
284 	int rc;
285 
286 	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
287 					 0, 0);
288 
289 	rc  = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
290 			   (u16 __user *)__LC_EXT_INT_CODE);
291 	rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
292 	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
293 			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
294 	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
295 			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
296 	clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
297 	return rc ? -EFAULT : 0;
298 }
299 
__deliver_pfault_init(struct kvm_vcpu * vcpu)300 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
301 {
302 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
303 	struct kvm_s390_ext_info ext;
304 	int rc;
305 
306 	spin_lock(&li->lock);
307 	ext = li->irq.ext;
308 	clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
309 	li->irq.ext.ext_params2 = 0;
310 	spin_unlock(&li->lock);
311 
312 	VCPU_EVENT(vcpu, 4, "interrupt: pfault init parm:%x,parm64:%llx",
313 		   0, ext.ext_params2);
314 	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
315 					 KVM_S390_INT_PFAULT_INIT,
316 					 0, ext.ext_params2);
317 
318 	rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
319 	rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
320 	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
321 			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
322 	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
323 			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
324 	rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
325 	return rc ? -EFAULT : 0;
326 }
327 
__deliver_machine_check(struct kvm_vcpu * vcpu)328 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
329 {
330 	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
331 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
332 	struct kvm_s390_mchk_info mchk = {};
333 	unsigned long adtl_status_addr;
334 	int deliver = 0;
335 	int rc = 0;
336 
337 	spin_lock(&fi->lock);
338 	spin_lock(&li->lock);
339 	if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
340 	    test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
341 		/*
342 		 * If there was an exigent machine check pending, then any
343 		 * repressible machine checks that might have been pending
344 		 * are indicated along with it, so always clear bits for
345 		 * repressible and exigent interrupts
346 		 */
347 		mchk = li->irq.mchk;
348 		clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
349 		clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
350 		memset(&li->irq.mchk, 0, sizeof(mchk));
351 		deliver = 1;
352 	}
353 	/*
354 	 * We indicate floating repressible conditions along with
355 	 * other pending conditions. Channel Report Pending and Channel
356 	 * Subsystem damage are the only two and and are indicated by
357 	 * bits in mcic and masked in cr14.
358 	 */
359 	if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
360 		mchk.mcic |= fi->mchk.mcic;
361 		mchk.cr14 |= fi->mchk.cr14;
362 		memset(&fi->mchk, 0, sizeof(mchk));
363 		deliver = 1;
364 	}
365 	spin_unlock(&li->lock);
366 	spin_unlock(&fi->lock);
367 
368 	if (deliver) {
369 		VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx",
370 			   mchk.mcic);
371 		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
372 						 KVM_S390_MCHK,
373 						 mchk.cr14, mchk.mcic);
374 
375 		rc  = kvm_s390_vcpu_store_status(vcpu,
376 						 KVM_S390_STORE_STATUS_PREFIXED);
377 		rc |= read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR,
378 				    &adtl_status_addr,
379 				    sizeof(unsigned long));
380 		rc |= kvm_s390_vcpu_store_adtl_status(vcpu,
381 						      adtl_status_addr);
382 		rc |= put_guest_lc(vcpu, mchk.mcic,
383 				   (u64 __user *) __LC_MCCK_CODE);
384 		rc |= put_guest_lc(vcpu, mchk.failing_storage_address,
385 				   (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
386 		rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA,
387 				     &mchk.fixed_logout,
388 				     sizeof(mchk.fixed_logout));
389 		rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
390 				     &vcpu->arch.sie_block->gpsw,
391 				     sizeof(psw_t));
392 		rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
393 				    &vcpu->arch.sie_block->gpsw,
394 				    sizeof(psw_t));
395 	}
396 	return rc ? -EFAULT : 0;
397 }
398 
__deliver_restart(struct kvm_vcpu * vcpu)399 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
400 {
401 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
402 	int rc;
403 
404 	VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
405 	vcpu->stat.deliver_restart_signal++;
406 	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
407 
408 	rc  = write_guest_lc(vcpu,
409 			     offsetof(struct _lowcore, restart_old_psw),
410 			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
411 	rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw),
412 			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
413 	clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
414 	return rc ? -EFAULT : 0;
415 }
416 
__deliver_set_prefix(struct kvm_vcpu * vcpu)417 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
418 {
419 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
420 	struct kvm_s390_prefix_info prefix;
421 
422 	spin_lock(&li->lock);
423 	prefix = li->irq.prefix;
424 	li->irq.prefix.address = 0;
425 	clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
426 	spin_unlock(&li->lock);
427 
428 	VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x", prefix.address);
429 	vcpu->stat.deliver_prefix_signal++;
430 	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
431 					 KVM_S390_SIGP_SET_PREFIX,
432 					 prefix.address, 0);
433 
434 	kvm_s390_set_prefix(vcpu, prefix.address);
435 	return 0;
436 }
437 
__deliver_emergency_signal(struct kvm_vcpu * vcpu)438 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
439 {
440 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
441 	int rc;
442 	int cpu_addr;
443 
444 	spin_lock(&li->lock);
445 	cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
446 	clear_bit(cpu_addr, li->sigp_emerg_pending);
447 	if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
448 		clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
449 	spin_unlock(&li->lock);
450 
451 	VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
452 	vcpu->stat.deliver_emergency_signal++;
453 	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
454 					 cpu_addr, 0);
455 
456 	rc  = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
457 			   (u16 *)__LC_EXT_INT_CODE);
458 	rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
459 	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
460 			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
461 	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
462 			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
463 	return rc ? -EFAULT : 0;
464 }
465 
__deliver_external_call(struct kvm_vcpu * vcpu)466 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
467 {
468 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
469 	struct kvm_s390_extcall_info extcall;
470 	int rc;
471 
472 	spin_lock(&li->lock);
473 	extcall = li->irq.extcall;
474 	li->irq.extcall.code = 0;
475 	clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
476 	spin_unlock(&li->lock);
477 
478 	VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
479 	vcpu->stat.deliver_external_call++;
480 	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
481 					 KVM_S390_INT_EXTERNAL_CALL,
482 					 extcall.code, 0);
483 
484 	rc  = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
485 			   (u16 *)__LC_EXT_INT_CODE);
486 	rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
487 	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
488 			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
489 	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
490 			    sizeof(psw_t));
491 	return rc ? -EFAULT : 0;
492 }
493 
__deliver_prog(struct kvm_vcpu * vcpu)494 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
495 {
496 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
497 	struct kvm_s390_pgm_info pgm_info;
498 	int rc = 0, nullifying = false;
499 	u16 ilc = get_ilc(vcpu);
500 
501 	spin_lock(&li->lock);
502 	pgm_info = li->irq.pgm;
503 	clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
504 	memset(&li->irq.pgm, 0, sizeof(pgm_info));
505 	spin_unlock(&li->lock);
506 
507 	VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
508 		   pgm_info.code, ilc);
509 	vcpu->stat.deliver_program_int++;
510 	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
511 					 pgm_info.code, 0);
512 
513 	switch (pgm_info.code & ~PGM_PER) {
514 	case PGM_AFX_TRANSLATION:
515 	case PGM_ASX_TRANSLATION:
516 	case PGM_EX_TRANSLATION:
517 	case PGM_LFX_TRANSLATION:
518 	case PGM_LSTE_SEQUENCE:
519 	case PGM_LSX_TRANSLATION:
520 	case PGM_LX_TRANSLATION:
521 	case PGM_PRIMARY_AUTHORITY:
522 	case PGM_SECONDARY_AUTHORITY:
523 		nullifying = true;
524 		/* fall through */
525 	case PGM_SPACE_SWITCH:
526 		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
527 				  (u64 *)__LC_TRANS_EXC_CODE);
528 		break;
529 	case PGM_ALEN_TRANSLATION:
530 	case PGM_ALE_SEQUENCE:
531 	case PGM_ASTE_INSTANCE:
532 	case PGM_ASTE_SEQUENCE:
533 	case PGM_ASTE_VALIDITY:
534 	case PGM_EXTENDED_AUTHORITY:
535 		rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
536 				  (u8 *)__LC_EXC_ACCESS_ID);
537 		nullifying = true;
538 		break;
539 	case PGM_ASCE_TYPE:
540 	case PGM_PAGE_TRANSLATION:
541 	case PGM_REGION_FIRST_TRANS:
542 	case PGM_REGION_SECOND_TRANS:
543 	case PGM_REGION_THIRD_TRANS:
544 	case PGM_SEGMENT_TRANSLATION:
545 		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
546 				  (u64 *)__LC_TRANS_EXC_CODE);
547 		rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
548 				   (u8 *)__LC_EXC_ACCESS_ID);
549 		rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
550 				   (u8 *)__LC_OP_ACCESS_ID);
551 		nullifying = true;
552 		break;
553 	case PGM_MONITOR:
554 		rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
555 				  (u16 *)__LC_MON_CLASS_NR);
556 		rc |= put_guest_lc(vcpu, pgm_info.mon_code,
557 				   (u64 *)__LC_MON_CODE);
558 		break;
559 	case PGM_VECTOR_PROCESSING:
560 	case PGM_DATA:
561 		rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
562 				  (u32 *)__LC_DATA_EXC_CODE);
563 		break;
564 	case PGM_PROTECTION:
565 		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
566 				  (u64 *)__LC_TRANS_EXC_CODE);
567 		rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
568 				   (u8 *)__LC_EXC_ACCESS_ID);
569 		break;
570 	case PGM_STACK_FULL:
571 	case PGM_STACK_EMPTY:
572 	case PGM_STACK_SPECIFICATION:
573 	case PGM_STACK_TYPE:
574 	case PGM_STACK_OPERATION:
575 	case PGM_TRACE_TABEL:
576 	case PGM_CRYPTO_OPERATION:
577 		nullifying = true;
578 		break;
579 	}
580 
581 	if (pgm_info.code & PGM_PER) {
582 		rc |= put_guest_lc(vcpu, pgm_info.per_code,
583 				   (u8 *) __LC_PER_CODE);
584 		rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
585 				   (u8 *)__LC_PER_ATMID);
586 		rc |= put_guest_lc(vcpu, pgm_info.per_address,
587 				   (u64 *) __LC_PER_ADDRESS);
588 		rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
589 				   (u8 *) __LC_PER_ACCESS_ID);
590 	}
591 
592 	if (nullifying && vcpu->arch.sie_block->icptcode == ICPT_INST)
593 		kvm_s390_rewind_psw(vcpu, ilc);
594 
595 	rc |= put_guest_lc(vcpu, ilc, (u16 *) __LC_PGM_ILC);
596 	rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
597 				 (u64 *) __LC_LAST_BREAK);
598 	rc |= put_guest_lc(vcpu, pgm_info.code,
599 			   (u16 *)__LC_PGM_INT_CODE);
600 	rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
601 			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
602 	rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
603 			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
604 	return rc ? -EFAULT : 0;
605 }
606 
__deliver_service(struct kvm_vcpu * vcpu)607 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
608 {
609 	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
610 	struct kvm_s390_ext_info ext;
611 	int rc = 0;
612 
613 	spin_lock(&fi->lock);
614 	if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
615 		spin_unlock(&fi->lock);
616 		return 0;
617 	}
618 	ext = fi->srv_signal;
619 	memset(&fi->srv_signal, 0, sizeof(ext));
620 	clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
621 	spin_unlock(&fi->lock);
622 
623 	VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
624 		   ext.ext_params);
625 	vcpu->stat.deliver_service_signal++;
626 	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
627 					 ext.ext_params, 0);
628 
629 	rc  = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
630 	rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
631 	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
632 			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
633 	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
634 			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
635 	rc |= put_guest_lc(vcpu, ext.ext_params,
636 			   (u32 *)__LC_EXT_PARAMS);
637 
638 	return rc ? -EFAULT : 0;
639 }
640 
__deliver_pfault_done(struct kvm_vcpu * vcpu)641 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
642 {
643 	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
644 	struct kvm_s390_interrupt_info *inti;
645 	int rc = 0;
646 
647 	spin_lock(&fi->lock);
648 	inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
649 					struct kvm_s390_interrupt_info,
650 					list);
651 	if (inti) {
652 		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
653 				KVM_S390_INT_PFAULT_DONE, 0,
654 				inti->ext.ext_params2);
655 		list_del(&inti->list);
656 		fi->counters[FIRQ_CNTR_PFAULT] -= 1;
657 	}
658 	if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
659 		clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
660 	spin_unlock(&fi->lock);
661 
662 	if (inti) {
663 		rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
664 				(u16 *)__LC_EXT_INT_CODE);
665 		rc |= put_guest_lc(vcpu, PFAULT_DONE,
666 				(u16 *)__LC_EXT_CPU_ADDR);
667 		rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
668 				&vcpu->arch.sie_block->gpsw,
669 				sizeof(psw_t));
670 		rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
671 				&vcpu->arch.sie_block->gpsw,
672 				sizeof(psw_t));
673 		rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
674 				(u64 *)__LC_EXT_PARAMS2);
675 		kfree(inti);
676 	}
677 	return rc ? -EFAULT : 0;
678 }
679 
__deliver_virtio(struct kvm_vcpu * vcpu)680 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
681 {
682 	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
683 	struct kvm_s390_interrupt_info *inti;
684 	int rc = 0;
685 
686 	spin_lock(&fi->lock);
687 	inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
688 					struct kvm_s390_interrupt_info,
689 					list);
690 	if (inti) {
691 		VCPU_EVENT(vcpu, 4,
692 			   "interrupt: virtio parm:%x,parm64:%llx",
693 			   inti->ext.ext_params, inti->ext.ext_params2);
694 		vcpu->stat.deliver_virtio_interrupt++;
695 		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
696 				inti->type,
697 				inti->ext.ext_params,
698 				inti->ext.ext_params2);
699 		list_del(&inti->list);
700 		fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
701 	}
702 	if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
703 		clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
704 	spin_unlock(&fi->lock);
705 
706 	if (inti) {
707 		rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
708 				(u16 *)__LC_EXT_INT_CODE);
709 		rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
710 				(u16 *)__LC_EXT_CPU_ADDR);
711 		rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
712 				&vcpu->arch.sie_block->gpsw,
713 				sizeof(psw_t));
714 		rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
715 				&vcpu->arch.sie_block->gpsw,
716 				sizeof(psw_t));
717 		rc |= put_guest_lc(vcpu, inti->ext.ext_params,
718 				(u32 *)__LC_EXT_PARAMS);
719 		rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
720 				(u64 *)__LC_EXT_PARAMS2);
721 		kfree(inti);
722 	}
723 	return rc ? -EFAULT : 0;
724 }
725 
__deliver_io(struct kvm_vcpu * vcpu,unsigned long irq_type)726 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
727 				     unsigned long irq_type)
728 {
729 	struct list_head *isc_list;
730 	struct kvm_s390_float_interrupt *fi;
731 	struct kvm_s390_interrupt_info *inti = NULL;
732 	int rc = 0;
733 
734 	fi = &vcpu->kvm->arch.float_int;
735 
736 	spin_lock(&fi->lock);
737 	isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0];
738 	inti = list_first_entry_or_null(isc_list,
739 					struct kvm_s390_interrupt_info,
740 					list);
741 	if (inti) {
742 		VCPU_EVENT(vcpu, 4, "interrupt: I/O %llx", inti->type);
743 		vcpu->stat.deliver_io_int++;
744 		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
745 				inti->type,
746 				((__u32)inti->io.subchannel_id << 16) |
747 				inti->io.subchannel_nr,
748 				((__u64)inti->io.io_int_parm << 32) |
749 				inti->io.io_int_word);
750 		list_del(&inti->list);
751 		fi->counters[FIRQ_CNTR_IO] -= 1;
752 	}
753 	if (list_empty(isc_list))
754 		clear_bit(irq_type, &fi->pending_irqs);
755 	spin_unlock(&fi->lock);
756 
757 	if (inti) {
758 		rc  = put_guest_lc(vcpu, inti->io.subchannel_id,
759 				(u16 *)__LC_SUBCHANNEL_ID);
760 		rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
761 				(u16 *)__LC_SUBCHANNEL_NR);
762 		rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
763 				(u32 *)__LC_IO_INT_PARM);
764 		rc |= put_guest_lc(vcpu, inti->io.io_int_word,
765 				(u32 *)__LC_IO_INT_WORD);
766 		rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
767 				&vcpu->arch.sie_block->gpsw,
768 				sizeof(psw_t));
769 		rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
770 				&vcpu->arch.sie_block->gpsw,
771 				sizeof(psw_t));
772 		kfree(inti);
773 	}
774 
775 	return rc ? -EFAULT : 0;
776 }
777 
778 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
779 
780 static const deliver_irq_t deliver_irq_funcs[] = {
781 	[IRQ_PEND_MCHK_EX]        = __deliver_machine_check,
782 	[IRQ_PEND_MCHK_REP]       = __deliver_machine_check,
783 	[IRQ_PEND_PROG]           = __deliver_prog,
784 	[IRQ_PEND_EXT_EMERGENCY]  = __deliver_emergency_signal,
785 	[IRQ_PEND_EXT_EXTERNAL]   = __deliver_external_call,
786 	[IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
787 	[IRQ_PEND_EXT_CPU_TIMER]  = __deliver_cpu_timer,
788 	[IRQ_PEND_RESTART]        = __deliver_restart,
789 	[IRQ_PEND_SET_PREFIX]     = __deliver_set_prefix,
790 	[IRQ_PEND_PFAULT_INIT]    = __deliver_pfault_init,
791 	[IRQ_PEND_EXT_SERVICE]    = __deliver_service,
792 	[IRQ_PEND_PFAULT_DONE]    = __deliver_pfault_done,
793 	[IRQ_PEND_VIRTIO]         = __deliver_virtio,
794 };
795 
796 /* Check whether an external call is pending (deliverable or not) */
kvm_s390_ext_call_pending(struct kvm_vcpu * vcpu)797 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
798 {
799 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
800 	uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
801 
802 	if (!sclp_has_sigpif())
803 		return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
804 
805 	return (sigp_ctrl & SIGP_CTRL_C) &&
806 	       (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND);
807 }
808 
kvm_s390_vcpu_has_irq(struct kvm_vcpu * vcpu,int exclude_stop)809 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
810 {
811 	int rc;
812 
813 	rc = !!deliverable_irqs(vcpu);
814 
815 	if (!rc && kvm_cpu_has_pending_timer(vcpu))
816 		rc = 1;
817 
818 	/* external call pending and deliverable */
819 	if (!rc && kvm_s390_ext_call_pending(vcpu) &&
820 	    !psw_extint_disabled(vcpu) &&
821 	    (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
822 		rc = 1;
823 
824 	if (!rc && !exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
825 		rc = 1;
826 
827 	return rc;
828 }
829 
kvm_cpu_has_pending_timer(struct kvm_vcpu * vcpu)830 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
831 {
832 	return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
833 }
834 
kvm_s390_handle_wait(struct kvm_vcpu * vcpu)835 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
836 {
837 	u64 now, sltime;
838 
839 	vcpu->stat.exit_wait_state++;
840 
841 	/* fast path */
842 	if (kvm_cpu_has_pending_timer(vcpu) || kvm_arch_vcpu_runnable(vcpu))
843 		return 0;
844 
845 	if (psw_interrupts_disabled(vcpu)) {
846 		VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
847 		return -EOPNOTSUPP; /* disabled wait */
848 	}
849 
850 	if (!ckc_interrupts_enabled(vcpu)) {
851 		VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
852 		__set_cpu_idle(vcpu);
853 		goto no_timer;
854 	}
855 
856 	now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
857 	sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
858 
859 	/* underflow */
860 	if (vcpu->arch.sie_block->ckc < now)
861 		return 0;
862 
863 	__set_cpu_idle(vcpu);
864 	hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
865 	VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
866 no_timer:
867 	srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
868 	kvm_vcpu_block(vcpu);
869 	__unset_cpu_idle(vcpu);
870 	vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
871 
872 	hrtimer_cancel(&vcpu->arch.ckc_timer);
873 	return 0;
874 }
875 
kvm_s390_vcpu_wakeup(struct kvm_vcpu * vcpu)876 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
877 {
878 	if (waitqueue_active(&vcpu->wq)) {
879 		/*
880 		 * The vcpu gave up the cpu voluntarily, mark it as a good
881 		 * yield-candidate.
882 		 */
883 		vcpu->preempted = true;
884 		wake_up_interruptible(&vcpu->wq);
885 		vcpu->stat.halt_wakeup++;
886 	}
887 }
888 
kvm_s390_idle_wakeup(struct hrtimer * timer)889 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
890 {
891 	struct kvm_vcpu *vcpu;
892 	u64 now, sltime;
893 
894 	vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
895 	now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
896 	sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
897 
898 	/*
899 	 * If the monotonic clock runs faster than the tod clock we might be
900 	 * woken up too early and have to go back to sleep to avoid deadlocks.
901 	 */
902 	if (vcpu->arch.sie_block->ckc > now &&
903 	    hrtimer_forward_now(timer, ns_to_ktime(sltime)))
904 		return HRTIMER_RESTART;
905 	kvm_s390_vcpu_wakeup(vcpu);
906 	return HRTIMER_NORESTART;
907 }
908 
kvm_s390_clear_local_irqs(struct kvm_vcpu * vcpu)909 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
910 {
911 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
912 
913 	spin_lock(&li->lock);
914 	li->pending_irqs = 0;
915 	bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
916 	memset(&li->irq, 0, sizeof(li->irq));
917 	spin_unlock(&li->lock);
918 
919 	/* clear pending external calls set by sigp interpretation facility */
920 	atomic_clear_mask(CPUSTAT_ECALL_PEND, li->cpuflags);
921 	vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl = 0;
922 }
923 
kvm_s390_deliver_pending_interrupts(struct kvm_vcpu * vcpu)924 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
925 {
926 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
927 	deliver_irq_t func;
928 	int rc = 0;
929 	unsigned long irq_type;
930 	unsigned long irqs;
931 
932 	__reset_intercept_indicators(vcpu);
933 
934 	/* pending ckc conditions might have been invalidated */
935 	clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
936 	if (ckc_irq_pending(vcpu))
937 		set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
938 
939 	/* pending cpu timer conditions might have been invalidated */
940 	clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
941 	if (cpu_timer_irq_pending(vcpu))
942 		set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
943 
944 	do {
945 		irqs = deliverable_irqs(vcpu);
946 		/* bits are in the order of interrupt priority */
947 		irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
948 		if (irq_type == IRQ_PEND_COUNT)
949 			break;
950 		if (is_ioirq(irq_type)) {
951 			rc = __deliver_io(vcpu, irq_type);
952 		} else {
953 			func = deliver_irq_funcs[irq_type];
954 			if (!func) {
955 				WARN_ON_ONCE(func == NULL);
956 				clear_bit(irq_type, &li->pending_irqs);
957 				continue;
958 			}
959 			rc = func(vcpu);
960 		}
961 		if (rc)
962 			break;
963 	} while (!rc);
964 
965 	set_intercept_indicators(vcpu);
966 
967 	return rc;
968 }
969 
__inject_prog(struct kvm_vcpu * vcpu,struct kvm_s390_irq * irq)970 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
971 {
972 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
973 
974 	li->irq.pgm = irq->u.pgm;
975 	set_bit(IRQ_PEND_PROG, &li->pending_irqs);
976 	return 0;
977 }
978 
kvm_s390_inject_program_int(struct kvm_vcpu * vcpu,u16 code)979 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
980 {
981 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
982 	struct kvm_s390_irq irq;
983 
984 	VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
985 	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT, code,
986 				   0, 1);
987 	spin_lock(&li->lock);
988 	irq.u.pgm.code = code;
989 	__inject_prog(vcpu, &irq);
990 	BUG_ON(waitqueue_active(li->wq));
991 	spin_unlock(&li->lock);
992 	return 0;
993 }
994 
kvm_s390_inject_prog_irq(struct kvm_vcpu * vcpu,struct kvm_s390_pgm_info * pgm_info)995 int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
996 			     struct kvm_s390_pgm_info *pgm_info)
997 {
998 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
999 	struct kvm_s390_irq irq;
1000 	int rc;
1001 
1002 	VCPU_EVENT(vcpu, 3, "inject: prog irq %d (from kernel)",
1003 		   pgm_info->code);
1004 	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
1005 				   pgm_info->code, 0, 1);
1006 	spin_lock(&li->lock);
1007 	irq.u.pgm = *pgm_info;
1008 	rc = __inject_prog(vcpu, &irq);
1009 	BUG_ON(waitqueue_active(li->wq));
1010 	spin_unlock(&li->lock);
1011 	return rc;
1012 }
1013 
__inject_pfault_init(struct kvm_vcpu * vcpu,struct kvm_s390_irq * irq)1014 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1015 {
1016 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1017 
1018 	VCPU_EVENT(vcpu, 3, "inject: external irq params:%x, params2:%llx",
1019 		   irq->u.ext.ext_params, irq->u.ext.ext_params2);
1020 	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1021 				   irq->u.ext.ext_params,
1022 				   irq->u.ext.ext_params2, 2);
1023 
1024 	li->irq.ext = irq->u.ext;
1025 	set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1026 	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1027 	return 0;
1028 }
1029 
__inject_extcall_sigpif(struct kvm_vcpu * vcpu,uint16_t src_id)1030 static int __inject_extcall_sigpif(struct kvm_vcpu *vcpu, uint16_t src_id)
1031 {
1032 	unsigned char new_val, old_val;
1033 	uint8_t *sigp_ctrl = &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
1034 
1035 	new_val = SIGP_CTRL_C | (src_id & SIGP_CTRL_SCN_MASK);
1036 	old_val = *sigp_ctrl & ~SIGP_CTRL_C;
1037 	if (cmpxchg(sigp_ctrl, old_val, new_val) != old_val) {
1038 		/* another external call is pending */
1039 		return -EBUSY;
1040 	}
1041 	atomic_set_mask(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
1042 	return 0;
1043 }
1044 
__inject_extcall(struct kvm_vcpu * vcpu,struct kvm_s390_irq * irq)1045 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1046 {
1047 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1048 	struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1049 	uint16_t src_id = irq->u.extcall.code;
1050 
1051 	VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
1052 		   src_id);
1053 	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1054 				   src_id, 0, 2);
1055 
1056 	/* sending vcpu invalid */
1057 	if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1058 		return -EINVAL;
1059 
1060 	if (sclp_has_sigpif())
1061 		return __inject_extcall_sigpif(vcpu, src_id);
1062 
1063 	if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1064 		return -EBUSY;
1065 	*extcall = irq->u.extcall;
1066 	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1067 	return 0;
1068 }
1069 
__inject_set_prefix(struct kvm_vcpu * vcpu,struct kvm_s390_irq * irq)1070 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1071 {
1072 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1073 	struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1074 
1075 	VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
1076 		   irq->u.prefix.address);
1077 	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1078 				   irq->u.prefix.address, 0, 2);
1079 
1080 	if (!is_vcpu_stopped(vcpu))
1081 		return -EBUSY;
1082 
1083 	*prefix = irq->u.prefix;
1084 	set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1085 	return 0;
1086 }
1087 
1088 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
__inject_sigp_stop(struct kvm_vcpu * vcpu,struct kvm_s390_irq * irq)1089 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1090 {
1091 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1092 	struct kvm_s390_stop_info *stop = &li->irq.stop;
1093 	int rc = 0;
1094 
1095 	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0, 2);
1096 
1097 	if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1098 		return -EINVAL;
1099 
1100 	if (is_vcpu_stopped(vcpu)) {
1101 		if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1102 			rc = kvm_s390_store_status_unloaded(vcpu,
1103 						KVM_S390_STORE_STATUS_NOADDR);
1104 		return rc;
1105 	}
1106 
1107 	if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1108 		return -EBUSY;
1109 	stop->flags = irq->u.stop.flags;
1110 	__set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1111 	return 0;
1112 }
1113 
__inject_sigp_restart(struct kvm_vcpu * vcpu,struct kvm_s390_irq * irq)1114 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1115 				 struct kvm_s390_irq *irq)
1116 {
1117 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1118 
1119 	VCPU_EVENT(vcpu, 3, "inject: restart type %llx", irq->type);
1120 	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0, 2);
1121 
1122 	set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1123 	return 0;
1124 }
1125 
__inject_sigp_emergency(struct kvm_vcpu * vcpu,struct kvm_s390_irq * irq)1126 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1127 				   struct kvm_s390_irq *irq)
1128 {
1129 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1130 
1131 	VCPU_EVENT(vcpu, 3, "inject: emergency %u\n",
1132 		   irq->u.emerg.code);
1133 	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1134 				   irq->u.emerg.code, 0, 2);
1135 
1136 	/* sending vcpu invalid */
1137 	if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
1138 		return -EINVAL;
1139 
1140 	set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1141 	set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1142 	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1143 	return 0;
1144 }
1145 
__inject_mchk(struct kvm_vcpu * vcpu,struct kvm_s390_irq * irq)1146 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1147 {
1148 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1149 	struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1150 
1151 	VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx",
1152 		   irq->u.mchk.mcic);
1153 	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1154 				   irq->u.mchk.mcic, 2);
1155 
1156 	/*
1157 	 * Because repressible machine checks can be indicated along with
1158 	 * exigent machine checks (PoP, Chapter 11, Interruption action)
1159 	 * we need to combine cr14, mcic and external damage code.
1160 	 * Failing storage address and the logout area should not be or'ed
1161 	 * together, we just indicate the last occurrence of the corresponding
1162 	 * machine check
1163 	 */
1164 	mchk->cr14 |= irq->u.mchk.cr14;
1165 	mchk->mcic |= irq->u.mchk.mcic;
1166 	mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1167 	mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1168 	memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1169 	       sizeof(mchk->fixed_logout));
1170 	if (mchk->mcic & MCHK_EX_MASK)
1171 		set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1172 	else if (mchk->mcic & MCHK_REP_MASK)
1173 		set_bit(IRQ_PEND_MCHK_REP,  &li->pending_irqs);
1174 	return 0;
1175 }
1176 
__inject_ckc(struct kvm_vcpu * vcpu)1177 static int __inject_ckc(struct kvm_vcpu *vcpu)
1178 {
1179 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1180 
1181 	VCPU_EVENT(vcpu, 3, "inject: type %x", KVM_S390_INT_CLOCK_COMP);
1182 	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1183 				   0, 0, 2);
1184 
1185 	set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1186 	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1187 	return 0;
1188 }
1189 
__inject_cpu_timer(struct kvm_vcpu * vcpu)1190 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1191 {
1192 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1193 
1194 	VCPU_EVENT(vcpu, 3, "inject: type %x", KVM_S390_INT_CPU_TIMER);
1195 	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1196 				   0, 0, 2);
1197 
1198 	set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1199 	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1200 	return 0;
1201 }
1202 
get_io_int(struct kvm * kvm,int isc,u32 schid)1203 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1204 						  int isc, u32 schid)
1205 {
1206 	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1207 	struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1208 	struct kvm_s390_interrupt_info *iter;
1209 	u16 id = (schid & 0xffff0000U) >> 16;
1210 	u16 nr = schid & 0x0000ffffU;
1211 
1212 	spin_lock(&fi->lock);
1213 	list_for_each_entry(iter, isc_list, list) {
1214 		if (schid && (id != iter->io.subchannel_id ||
1215 			      nr != iter->io.subchannel_nr))
1216 			continue;
1217 		/* found an appropriate entry */
1218 		list_del_init(&iter->list);
1219 		fi->counters[FIRQ_CNTR_IO] -= 1;
1220 		if (list_empty(isc_list))
1221 			clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1222 		spin_unlock(&fi->lock);
1223 		return iter;
1224 	}
1225 	spin_unlock(&fi->lock);
1226 	return NULL;
1227 }
1228 
1229 /*
1230  * Dequeue and return an I/O interrupt matching any of the interruption
1231  * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1232  */
kvm_s390_get_io_int(struct kvm * kvm,u64 isc_mask,u32 schid)1233 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1234 						    u64 isc_mask, u32 schid)
1235 {
1236 	struct kvm_s390_interrupt_info *inti = NULL;
1237 	int isc;
1238 
1239 	for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1240 		if (isc_mask & isc_to_isc_bits(isc))
1241 			inti = get_io_int(kvm, isc, schid);
1242 	}
1243 	return inti;
1244 }
1245 
1246 #define SCCB_MASK 0xFFFFFFF8
1247 #define SCCB_EVENT_PENDING 0x3
1248 
__inject_service(struct kvm * kvm,struct kvm_s390_interrupt_info * inti)1249 static int __inject_service(struct kvm *kvm,
1250 			     struct kvm_s390_interrupt_info *inti)
1251 {
1252 	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1253 
1254 	spin_lock(&fi->lock);
1255 	fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1256 	/*
1257 	 * Early versions of the QEMU s390 bios will inject several
1258 	 * service interrupts after another without handling a
1259 	 * condition code indicating busy.
1260 	 * We will silently ignore those superfluous sccb values.
1261 	 * A future version of QEMU will take care of serialization
1262 	 * of servc requests
1263 	 */
1264 	if (fi->srv_signal.ext_params & SCCB_MASK)
1265 		goto out;
1266 	fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1267 	set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1268 out:
1269 	spin_unlock(&fi->lock);
1270 	kfree(inti);
1271 	return 0;
1272 }
1273 
__inject_virtio(struct kvm * kvm,struct kvm_s390_interrupt_info * inti)1274 static int __inject_virtio(struct kvm *kvm,
1275 			    struct kvm_s390_interrupt_info *inti)
1276 {
1277 	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1278 
1279 	spin_lock(&fi->lock);
1280 	if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1281 		spin_unlock(&fi->lock);
1282 		return -EBUSY;
1283 	}
1284 	fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1285 	list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1286 	set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1287 	spin_unlock(&fi->lock);
1288 	return 0;
1289 }
1290 
__inject_pfault_done(struct kvm * kvm,struct kvm_s390_interrupt_info * inti)1291 static int __inject_pfault_done(struct kvm *kvm,
1292 				 struct kvm_s390_interrupt_info *inti)
1293 {
1294 	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1295 
1296 	spin_lock(&fi->lock);
1297 	if (fi->counters[FIRQ_CNTR_PFAULT] >=
1298 		(ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1299 		spin_unlock(&fi->lock);
1300 		return -EBUSY;
1301 	}
1302 	fi->counters[FIRQ_CNTR_PFAULT] += 1;
1303 	list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1304 	set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1305 	spin_unlock(&fi->lock);
1306 	return 0;
1307 }
1308 
1309 #define CR_PENDING_SUBCLASS 28
__inject_float_mchk(struct kvm * kvm,struct kvm_s390_interrupt_info * inti)1310 static int __inject_float_mchk(struct kvm *kvm,
1311 				struct kvm_s390_interrupt_info *inti)
1312 {
1313 	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1314 
1315 	spin_lock(&fi->lock);
1316 	fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1317 	fi->mchk.mcic |= inti->mchk.mcic;
1318 	set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1319 	spin_unlock(&fi->lock);
1320 	kfree(inti);
1321 	return 0;
1322 }
1323 
__inject_io(struct kvm * kvm,struct kvm_s390_interrupt_info * inti)1324 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1325 {
1326 	struct kvm_s390_float_interrupt *fi;
1327 	struct list_head *list;
1328 	int isc;
1329 
1330 	fi = &kvm->arch.float_int;
1331 	spin_lock(&fi->lock);
1332 	if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1333 		spin_unlock(&fi->lock);
1334 		return -EBUSY;
1335 	}
1336 	fi->counters[FIRQ_CNTR_IO] += 1;
1337 
1338 	isc = int_word_to_isc(inti->io.io_int_word);
1339 	list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1340 	list_add_tail(&inti->list, list);
1341 	set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1342 	spin_unlock(&fi->lock);
1343 	return 0;
1344 }
1345 
__inject_vm(struct kvm * kvm,struct kvm_s390_interrupt_info * inti)1346 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1347 {
1348 	struct kvm_s390_local_interrupt *li;
1349 	struct kvm_s390_float_interrupt *fi;
1350 	struct kvm_vcpu *dst_vcpu = NULL;
1351 	int sigcpu;
1352 	u64 type = READ_ONCE(inti->type);
1353 	int rc;
1354 
1355 	fi = &kvm->arch.float_int;
1356 
1357 	switch (type) {
1358 	case KVM_S390_MCHK:
1359 		rc = __inject_float_mchk(kvm, inti);
1360 		break;
1361 	case KVM_S390_INT_VIRTIO:
1362 		rc = __inject_virtio(kvm, inti);
1363 		break;
1364 	case KVM_S390_INT_SERVICE:
1365 		rc = __inject_service(kvm, inti);
1366 		break;
1367 	case KVM_S390_INT_PFAULT_DONE:
1368 		rc = __inject_pfault_done(kvm, inti);
1369 		break;
1370 	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1371 		rc = __inject_io(kvm, inti);
1372 		break;
1373 	default:
1374 		rc = -EINVAL;
1375 	}
1376 	if (rc)
1377 		return rc;
1378 
1379 	sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
1380 	if (sigcpu == KVM_MAX_VCPUS) {
1381 		do {
1382 			sigcpu = fi->next_rr_cpu++;
1383 			if (sigcpu == KVM_MAX_VCPUS)
1384 				sigcpu = fi->next_rr_cpu = 0;
1385 		} while (kvm_get_vcpu(kvm, sigcpu) == NULL);
1386 	}
1387 	dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1388 	li = &dst_vcpu->arch.local_int;
1389 	spin_lock(&li->lock);
1390 	switch (type) {
1391 	case KVM_S390_MCHK:
1392 		atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
1393 		break;
1394 	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1395 		atomic_set_mask(CPUSTAT_IO_INT, li->cpuflags);
1396 		break;
1397 	default:
1398 		atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1399 		break;
1400 	}
1401 	spin_unlock(&li->lock);
1402 	kvm_s390_vcpu_wakeup(kvm_get_vcpu(kvm, sigcpu));
1403 	return 0;
1404 
1405 }
1406 
kvm_s390_inject_vm(struct kvm * kvm,struct kvm_s390_interrupt * s390int)1407 int kvm_s390_inject_vm(struct kvm *kvm,
1408 		       struct kvm_s390_interrupt *s390int)
1409 {
1410 	struct kvm_s390_interrupt_info *inti;
1411 	int rc;
1412 
1413 	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1414 	if (!inti)
1415 		return -ENOMEM;
1416 
1417 	inti->type = s390int->type;
1418 	switch (inti->type) {
1419 	case KVM_S390_INT_VIRTIO:
1420 		VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1421 			 s390int->parm, s390int->parm64);
1422 		inti->ext.ext_params = s390int->parm;
1423 		inti->ext.ext_params2 = s390int->parm64;
1424 		break;
1425 	case KVM_S390_INT_SERVICE:
1426 		VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
1427 		inti->ext.ext_params = s390int->parm;
1428 		break;
1429 	case KVM_S390_INT_PFAULT_DONE:
1430 		inti->ext.ext_params2 = s390int->parm64;
1431 		break;
1432 	case KVM_S390_MCHK:
1433 		VM_EVENT(kvm, 5, "inject: machine check parm64:%llx",
1434 			 s390int->parm64);
1435 		inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1436 		inti->mchk.mcic = s390int->parm64;
1437 		break;
1438 	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1439 		if (inti->type & IOINT_AI_MASK)
1440 			VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
1441 		else
1442 			VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
1443 				 s390int->type & IOINT_CSSID_MASK,
1444 				 s390int->type & IOINT_SSID_MASK,
1445 				 s390int->type & IOINT_SCHID_MASK);
1446 		inti->io.subchannel_id = s390int->parm >> 16;
1447 		inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1448 		inti->io.io_int_parm = s390int->parm64 >> 32;
1449 		inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1450 		break;
1451 	default:
1452 		kfree(inti);
1453 		return -EINVAL;
1454 	}
1455 	trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1456 				 2);
1457 
1458 	rc = __inject_vm(kvm, inti);
1459 	if (rc)
1460 		kfree(inti);
1461 	return rc;
1462 }
1463 
kvm_s390_reinject_io_int(struct kvm * kvm,struct kvm_s390_interrupt_info * inti)1464 int kvm_s390_reinject_io_int(struct kvm *kvm,
1465 			      struct kvm_s390_interrupt_info *inti)
1466 {
1467 	return __inject_vm(kvm, inti);
1468 }
1469 
s390int_to_s390irq(struct kvm_s390_interrupt * s390int,struct kvm_s390_irq * irq)1470 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1471 		       struct kvm_s390_irq *irq)
1472 {
1473 	irq->type = s390int->type;
1474 	switch (irq->type) {
1475 	case KVM_S390_PROGRAM_INT:
1476 		if (s390int->parm & 0xffff0000)
1477 			return -EINVAL;
1478 		irq->u.pgm.code = s390int->parm;
1479 		break;
1480 	case KVM_S390_SIGP_SET_PREFIX:
1481 		irq->u.prefix.address = s390int->parm;
1482 		break;
1483 	case KVM_S390_SIGP_STOP:
1484 		irq->u.stop.flags = s390int->parm;
1485 		break;
1486 	case KVM_S390_INT_EXTERNAL_CALL:
1487 		if (s390int->parm & 0xffff0000)
1488 			return -EINVAL;
1489 		irq->u.extcall.code = s390int->parm;
1490 		break;
1491 	case KVM_S390_INT_EMERGENCY:
1492 		if (s390int->parm & 0xffff0000)
1493 			return -EINVAL;
1494 		irq->u.emerg.code = s390int->parm;
1495 		break;
1496 	case KVM_S390_MCHK:
1497 		irq->u.mchk.mcic = s390int->parm64;
1498 		break;
1499 	}
1500 	return 0;
1501 }
1502 
kvm_s390_is_stop_irq_pending(struct kvm_vcpu * vcpu)1503 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1504 {
1505 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1506 
1507 	return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1508 }
1509 
kvm_s390_clear_stop_irq(struct kvm_vcpu * vcpu)1510 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1511 {
1512 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1513 
1514 	spin_lock(&li->lock);
1515 	li->irq.stop.flags = 0;
1516 	clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1517 	spin_unlock(&li->lock);
1518 }
1519 
do_inject_vcpu(struct kvm_vcpu * vcpu,struct kvm_s390_irq * irq)1520 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1521 {
1522 	int rc;
1523 
1524 	switch (irq->type) {
1525 	case KVM_S390_PROGRAM_INT:
1526 		VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
1527 			   irq->u.pgm.code);
1528 		rc = __inject_prog(vcpu, irq);
1529 		break;
1530 	case KVM_S390_SIGP_SET_PREFIX:
1531 		rc = __inject_set_prefix(vcpu, irq);
1532 		break;
1533 	case KVM_S390_SIGP_STOP:
1534 		rc = __inject_sigp_stop(vcpu, irq);
1535 		break;
1536 	case KVM_S390_RESTART:
1537 		rc = __inject_sigp_restart(vcpu, irq);
1538 		break;
1539 	case KVM_S390_INT_CLOCK_COMP:
1540 		rc = __inject_ckc(vcpu);
1541 		break;
1542 	case KVM_S390_INT_CPU_TIMER:
1543 		rc = __inject_cpu_timer(vcpu);
1544 		break;
1545 	case KVM_S390_INT_EXTERNAL_CALL:
1546 		rc = __inject_extcall(vcpu, irq);
1547 		break;
1548 	case KVM_S390_INT_EMERGENCY:
1549 		rc = __inject_sigp_emergency(vcpu, irq);
1550 		break;
1551 	case KVM_S390_MCHK:
1552 		rc = __inject_mchk(vcpu, irq);
1553 		break;
1554 	case KVM_S390_INT_PFAULT_INIT:
1555 		rc = __inject_pfault_init(vcpu, irq);
1556 		break;
1557 	case KVM_S390_INT_VIRTIO:
1558 	case KVM_S390_INT_SERVICE:
1559 	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1560 	default:
1561 		rc = -EINVAL;
1562 	}
1563 
1564 	return rc;
1565 }
1566 
kvm_s390_inject_vcpu(struct kvm_vcpu * vcpu,struct kvm_s390_irq * irq)1567 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1568 {
1569 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1570 	int rc;
1571 
1572 	spin_lock(&li->lock);
1573 	rc = do_inject_vcpu(vcpu, irq);
1574 	spin_unlock(&li->lock);
1575 	if (!rc)
1576 		kvm_s390_vcpu_wakeup(vcpu);
1577 	return rc;
1578 }
1579 
clear_irq_list(struct list_head * _list)1580 static inline void clear_irq_list(struct list_head *_list)
1581 {
1582 	struct kvm_s390_interrupt_info *inti, *n;
1583 
1584 	list_for_each_entry_safe(inti, n, _list, list) {
1585 		list_del(&inti->list);
1586 		kfree(inti);
1587 	}
1588 }
1589 
inti_to_irq(struct kvm_s390_interrupt_info * inti,struct kvm_s390_irq * irq)1590 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1591 		       struct kvm_s390_irq *irq)
1592 {
1593 	irq->type = inti->type;
1594 	switch (inti->type) {
1595 	case KVM_S390_INT_PFAULT_INIT:
1596 	case KVM_S390_INT_PFAULT_DONE:
1597 	case KVM_S390_INT_VIRTIO:
1598 		irq->u.ext = inti->ext;
1599 		break;
1600 	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1601 		irq->u.io = inti->io;
1602 		break;
1603 	}
1604 }
1605 
kvm_s390_clear_float_irqs(struct kvm * kvm)1606 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1607 {
1608 	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1609 	int i;
1610 
1611 	spin_lock(&fi->lock);
1612 	fi->pending_irqs = 0;
1613 	memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1614 	memset(&fi->mchk, 0, sizeof(fi->mchk));
1615 	for (i = 0; i < FIRQ_LIST_COUNT; i++)
1616 		clear_irq_list(&fi->lists[i]);
1617 	for (i = 0; i < FIRQ_MAX_COUNT; i++)
1618 		fi->counters[i] = 0;
1619 	spin_unlock(&fi->lock);
1620 };
1621 
get_all_floating_irqs(struct kvm * kvm,u8 __user * usrbuf,u64 len)1622 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1623 {
1624 	struct kvm_s390_interrupt_info *inti;
1625 	struct kvm_s390_float_interrupt *fi;
1626 	struct kvm_s390_irq *buf;
1627 	struct kvm_s390_irq *irq;
1628 	int max_irqs;
1629 	int ret = 0;
1630 	int n = 0;
1631 	int i;
1632 
1633 	if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1634 		return -EINVAL;
1635 
1636 	/*
1637 	 * We are already using -ENOMEM to signal
1638 	 * userspace it may retry with a bigger buffer,
1639 	 * so we need to use something else for this case
1640 	 */
1641 	buf = vzalloc(len);
1642 	if (!buf)
1643 		return -ENOBUFS;
1644 
1645 	max_irqs = len / sizeof(struct kvm_s390_irq);
1646 
1647 	fi = &kvm->arch.float_int;
1648 	spin_lock(&fi->lock);
1649 	for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1650 		list_for_each_entry(inti, &fi->lists[i], list) {
1651 			if (n == max_irqs) {
1652 				/* signal userspace to try again */
1653 				ret = -ENOMEM;
1654 				goto out;
1655 			}
1656 			inti_to_irq(inti, &buf[n]);
1657 			n++;
1658 		}
1659 	}
1660 	if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
1661 		if (n == max_irqs) {
1662 			/* signal userspace to try again */
1663 			ret = -ENOMEM;
1664 			goto out;
1665 		}
1666 		irq = (struct kvm_s390_irq *) &buf[n];
1667 		irq->type = KVM_S390_INT_SERVICE;
1668 		irq->u.ext = fi->srv_signal;
1669 		n++;
1670 	}
1671 	if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
1672 		if (n == max_irqs) {
1673 				/* signal userspace to try again */
1674 				ret = -ENOMEM;
1675 				goto out;
1676 		}
1677 		irq = (struct kvm_s390_irq *) &buf[n];
1678 		irq->type = KVM_S390_MCHK;
1679 		irq->u.mchk = fi->mchk;
1680 		n++;
1681 }
1682 
1683 out:
1684 	spin_unlock(&fi->lock);
1685 	if (!ret && n > 0) {
1686 		if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
1687 			ret = -EFAULT;
1688 	}
1689 	vfree(buf);
1690 
1691 	return ret < 0 ? ret : n;
1692 }
1693 
flic_get_attr(struct kvm_device * dev,struct kvm_device_attr * attr)1694 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1695 {
1696 	int r;
1697 
1698 	switch (attr->group) {
1699 	case KVM_DEV_FLIC_GET_ALL_IRQS:
1700 		r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1701 					  attr->attr);
1702 		break;
1703 	default:
1704 		r = -EINVAL;
1705 	}
1706 
1707 	return r;
1708 }
1709 
copy_irq_from_user(struct kvm_s390_interrupt_info * inti,u64 addr)1710 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1711 				     u64 addr)
1712 {
1713 	struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1714 	void *target = NULL;
1715 	void __user *source;
1716 	u64 size;
1717 
1718 	if (get_user(inti->type, (u64 __user *)addr))
1719 		return -EFAULT;
1720 
1721 	switch (inti->type) {
1722 	case KVM_S390_INT_PFAULT_INIT:
1723 	case KVM_S390_INT_PFAULT_DONE:
1724 	case KVM_S390_INT_VIRTIO:
1725 	case KVM_S390_INT_SERVICE:
1726 		target = (void *) &inti->ext;
1727 		source = &uptr->u.ext;
1728 		size = sizeof(inti->ext);
1729 		break;
1730 	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1731 		target = (void *) &inti->io;
1732 		source = &uptr->u.io;
1733 		size = sizeof(inti->io);
1734 		break;
1735 	case KVM_S390_MCHK:
1736 		target = (void *) &inti->mchk;
1737 		source = &uptr->u.mchk;
1738 		size = sizeof(inti->mchk);
1739 		break;
1740 	default:
1741 		return -EINVAL;
1742 	}
1743 
1744 	if (copy_from_user(target, source, size))
1745 		return -EFAULT;
1746 
1747 	return 0;
1748 }
1749 
enqueue_floating_irq(struct kvm_device * dev,struct kvm_device_attr * attr)1750 static int enqueue_floating_irq(struct kvm_device *dev,
1751 				struct kvm_device_attr *attr)
1752 {
1753 	struct kvm_s390_interrupt_info *inti = NULL;
1754 	int r = 0;
1755 	int len = attr->attr;
1756 
1757 	if (len % sizeof(struct kvm_s390_irq) != 0)
1758 		return -EINVAL;
1759 	else if (len > KVM_S390_FLIC_MAX_BUFFER)
1760 		return -EINVAL;
1761 
1762 	while (len >= sizeof(struct kvm_s390_irq)) {
1763 		inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1764 		if (!inti)
1765 			return -ENOMEM;
1766 
1767 		r = copy_irq_from_user(inti, attr->addr);
1768 		if (r) {
1769 			kfree(inti);
1770 			return r;
1771 		}
1772 		r = __inject_vm(dev->kvm, inti);
1773 		if (r) {
1774 			kfree(inti);
1775 			return r;
1776 		}
1777 		len -= sizeof(struct kvm_s390_irq);
1778 		attr->addr += sizeof(struct kvm_s390_irq);
1779 	}
1780 
1781 	return r;
1782 }
1783 
get_io_adapter(struct kvm * kvm,unsigned int id)1784 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1785 {
1786 	if (id >= MAX_S390_IO_ADAPTERS)
1787 		return NULL;
1788 	return kvm->arch.adapters[id];
1789 }
1790 
register_io_adapter(struct kvm_device * dev,struct kvm_device_attr * attr)1791 static int register_io_adapter(struct kvm_device *dev,
1792 			       struct kvm_device_attr *attr)
1793 {
1794 	struct s390_io_adapter *adapter;
1795 	struct kvm_s390_io_adapter adapter_info;
1796 
1797 	if (copy_from_user(&adapter_info,
1798 			   (void __user *)attr->addr, sizeof(adapter_info)))
1799 		return -EFAULT;
1800 
1801 	if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1802 	    (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1803 		return -EINVAL;
1804 
1805 	adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1806 	if (!adapter)
1807 		return -ENOMEM;
1808 
1809 	INIT_LIST_HEAD(&adapter->maps);
1810 	init_rwsem(&adapter->maps_lock);
1811 	atomic_set(&adapter->nr_maps, 0);
1812 	adapter->id = adapter_info.id;
1813 	adapter->isc = adapter_info.isc;
1814 	adapter->maskable = adapter_info.maskable;
1815 	adapter->masked = false;
1816 	adapter->swap = adapter_info.swap;
1817 	dev->kvm->arch.adapters[adapter->id] = adapter;
1818 
1819 	return 0;
1820 }
1821 
kvm_s390_mask_adapter(struct kvm * kvm,unsigned int id,bool masked)1822 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1823 {
1824 	int ret;
1825 	struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1826 
1827 	if (!adapter || !adapter->maskable)
1828 		return -EINVAL;
1829 	ret = adapter->masked;
1830 	adapter->masked = masked;
1831 	return ret;
1832 }
1833 
kvm_s390_adapter_map(struct kvm * kvm,unsigned int id,__u64 addr)1834 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1835 {
1836 	struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1837 	struct s390_map_info *map;
1838 	int ret;
1839 
1840 	if (!adapter || !addr)
1841 		return -EINVAL;
1842 
1843 	map = kzalloc(sizeof(*map), GFP_KERNEL);
1844 	if (!map) {
1845 		ret = -ENOMEM;
1846 		goto out;
1847 	}
1848 	INIT_LIST_HEAD(&map->list);
1849 	map->guest_addr = addr;
1850 	map->addr = gmap_translate(kvm->arch.gmap, addr);
1851 	if (map->addr == -EFAULT) {
1852 		ret = -EFAULT;
1853 		goto out;
1854 	}
1855 	ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1856 	if (ret < 0)
1857 		goto out;
1858 	BUG_ON(ret != 1);
1859 	down_write(&adapter->maps_lock);
1860 	if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1861 		list_add_tail(&map->list, &adapter->maps);
1862 		ret = 0;
1863 	} else {
1864 		put_page(map->page);
1865 		ret = -EINVAL;
1866 	}
1867 	up_write(&adapter->maps_lock);
1868 out:
1869 	if (ret)
1870 		kfree(map);
1871 	return ret;
1872 }
1873 
kvm_s390_adapter_unmap(struct kvm * kvm,unsigned int id,__u64 addr)1874 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1875 {
1876 	struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1877 	struct s390_map_info *map, *tmp;
1878 	int found = 0;
1879 
1880 	if (!adapter || !addr)
1881 		return -EINVAL;
1882 
1883 	down_write(&adapter->maps_lock);
1884 	list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1885 		if (map->guest_addr == addr) {
1886 			found = 1;
1887 			atomic_dec(&adapter->nr_maps);
1888 			list_del(&map->list);
1889 			put_page(map->page);
1890 			kfree(map);
1891 			break;
1892 		}
1893 	}
1894 	up_write(&adapter->maps_lock);
1895 
1896 	return found ? 0 : -EINVAL;
1897 }
1898 
kvm_s390_destroy_adapters(struct kvm * kvm)1899 void kvm_s390_destroy_adapters(struct kvm *kvm)
1900 {
1901 	int i;
1902 	struct s390_map_info *map, *tmp;
1903 
1904 	for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1905 		if (!kvm->arch.adapters[i])
1906 			continue;
1907 		list_for_each_entry_safe(map, tmp,
1908 					 &kvm->arch.adapters[i]->maps, list) {
1909 			list_del(&map->list);
1910 			put_page(map->page);
1911 			kfree(map);
1912 		}
1913 		kfree(kvm->arch.adapters[i]);
1914 	}
1915 }
1916 
modify_io_adapter(struct kvm_device * dev,struct kvm_device_attr * attr)1917 static int modify_io_adapter(struct kvm_device *dev,
1918 			     struct kvm_device_attr *attr)
1919 {
1920 	struct kvm_s390_io_adapter_req req;
1921 	struct s390_io_adapter *adapter;
1922 	int ret;
1923 
1924 	if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
1925 		return -EFAULT;
1926 
1927 	adapter = get_io_adapter(dev->kvm, req.id);
1928 	if (!adapter)
1929 		return -EINVAL;
1930 	switch (req.type) {
1931 	case KVM_S390_IO_ADAPTER_MASK:
1932 		ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
1933 		if (ret > 0)
1934 			ret = 0;
1935 		break;
1936 	case KVM_S390_IO_ADAPTER_MAP:
1937 		ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
1938 		break;
1939 	case KVM_S390_IO_ADAPTER_UNMAP:
1940 		ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
1941 		break;
1942 	default:
1943 		ret = -EINVAL;
1944 	}
1945 
1946 	return ret;
1947 }
1948 
flic_set_attr(struct kvm_device * dev,struct kvm_device_attr * attr)1949 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1950 {
1951 	int r = 0;
1952 	unsigned int i;
1953 	struct kvm_vcpu *vcpu;
1954 
1955 	switch (attr->group) {
1956 	case KVM_DEV_FLIC_ENQUEUE:
1957 		r = enqueue_floating_irq(dev, attr);
1958 		break;
1959 	case KVM_DEV_FLIC_CLEAR_IRQS:
1960 		kvm_s390_clear_float_irqs(dev->kvm);
1961 		break;
1962 	case KVM_DEV_FLIC_APF_ENABLE:
1963 		dev->kvm->arch.gmap->pfault_enabled = 1;
1964 		break;
1965 	case KVM_DEV_FLIC_APF_DISABLE_WAIT:
1966 		dev->kvm->arch.gmap->pfault_enabled = 0;
1967 		/*
1968 		 * Make sure no async faults are in transition when
1969 		 * clearing the queues. So we don't need to worry
1970 		 * about late coming workers.
1971 		 */
1972 		synchronize_srcu(&dev->kvm->srcu);
1973 		kvm_for_each_vcpu(i, vcpu, dev->kvm)
1974 			kvm_clear_async_pf_completion_queue(vcpu);
1975 		break;
1976 	case KVM_DEV_FLIC_ADAPTER_REGISTER:
1977 		r = register_io_adapter(dev, attr);
1978 		break;
1979 	case KVM_DEV_FLIC_ADAPTER_MODIFY:
1980 		r = modify_io_adapter(dev, attr);
1981 		break;
1982 	default:
1983 		r = -EINVAL;
1984 	}
1985 
1986 	return r;
1987 }
1988 
flic_create(struct kvm_device * dev,u32 type)1989 static int flic_create(struct kvm_device *dev, u32 type)
1990 {
1991 	if (!dev)
1992 		return -EINVAL;
1993 	if (dev->kvm->arch.flic)
1994 		return -EINVAL;
1995 	dev->kvm->arch.flic = dev;
1996 	return 0;
1997 }
1998 
flic_destroy(struct kvm_device * dev)1999 static void flic_destroy(struct kvm_device *dev)
2000 {
2001 	dev->kvm->arch.flic = NULL;
2002 	kfree(dev);
2003 }
2004 
2005 /* s390 floating irq controller (flic) */
2006 struct kvm_device_ops kvm_flic_ops = {
2007 	.name = "kvm-flic",
2008 	.get_attr = flic_get_attr,
2009 	.set_attr = flic_set_attr,
2010 	.create = flic_create,
2011 	.destroy = flic_destroy,
2012 };
2013 
get_ind_bit(__u64 addr,unsigned long bit_nr,bool swap)2014 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2015 {
2016 	unsigned long bit;
2017 
2018 	bit = bit_nr + (addr % PAGE_SIZE) * 8;
2019 
2020 	return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2021 }
2022 
get_map_info(struct s390_io_adapter * adapter,u64 addr)2023 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2024 					  u64 addr)
2025 {
2026 	struct s390_map_info *map;
2027 
2028 	if (!adapter)
2029 		return NULL;
2030 
2031 	list_for_each_entry(map, &adapter->maps, list) {
2032 		if (map->guest_addr == addr)
2033 			return map;
2034 	}
2035 	return NULL;
2036 }
2037 
adapter_indicators_set(struct kvm * kvm,struct s390_io_adapter * adapter,struct kvm_s390_adapter_int * adapter_int)2038 static int adapter_indicators_set(struct kvm *kvm,
2039 				  struct s390_io_adapter *adapter,
2040 				  struct kvm_s390_adapter_int *adapter_int)
2041 {
2042 	unsigned long bit;
2043 	int summary_set, idx;
2044 	struct s390_map_info *info;
2045 	void *map;
2046 
2047 	info = get_map_info(adapter, adapter_int->ind_addr);
2048 	if (!info)
2049 		return -1;
2050 	map = page_address(info->page);
2051 	bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2052 	set_bit(bit, map);
2053 	idx = srcu_read_lock(&kvm->srcu);
2054 	mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2055 	set_page_dirty_lock(info->page);
2056 	info = get_map_info(adapter, adapter_int->summary_addr);
2057 	if (!info) {
2058 		srcu_read_unlock(&kvm->srcu, idx);
2059 		return -1;
2060 	}
2061 	map = page_address(info->page);
2062 	bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2063 			  adapter->swap);
2064 	summary_set = test_and_set_bit(bit, map);
2065 	mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2066 	set_page_dirty_lock(info->page);
2067 	srcu_read_unlock(&kvm->srcu, idx);
2068 	return summary_set ? 0 : 1;
2069 }
2070 
2071 /*
2072  * < 0 - not injected due to error
2073  * = 0 - coalesced, summary indicator already active
2074  * > 0 - injected interrupt
2075  */
set_adapter_int(struct kvm_kernel_irq_routing_entry * e,struct kvm * kvm,int irq_source_id,int level,bool line_status)2076 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2077 			   struct kvm *kvm, int irq_source_id, int level,
2078 			   bool line_status)
2079 {
2080 	int ret;
2081 	struct s390_io_adapter *adapter;
2082 
2083 	/* We're only interested in the 0->1 transition. */
2084 	if (!level)
2085 		return 0;
2086 	adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2087 	if (!adapter)
2088 		return -1;
2089 	down_read(&adapter->maps_lock);
2090 	ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2091 	up_read(&adapter->maps_lock);
2092 	if ((ret > 0) && !adapter->masked) {
2093 		struct kvm_s390_interrupt s390int = {
2094 			.type = KVM_S390_INT_IO(1, 0, 0, 0),
2095 			.parm = 0,
2096 			.parm64 = (adapter->isc << 27) | 0x80000000,
2097 		};
2098 		ret = kvm_s390_inject_vm(kvm, &s390int);
2099 		if (ret == 0)
2100 			ret = 1;
2101 	}
2102 	return ret;
2103 }
2104 
kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry * e,const struct kvm_irq_routing_entry * ue)2105 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
2106 			  const struct kvm_irq_routing_entry *ue)
2107 {
2108 	int ret;
2109 
2110 	switch (ue->type) {
2111 	case KVM_IRQ_ROUTING_S390_ADAPTER:
2112 		e->set = set_adapter_int;
2113 		e->adapter.summary_addr = ue->u.adapter.summary_addr;
2114 		e->adapter.ind_addr = ue->u.adapter.ind_addr;
2115 		e->adapter.summary_offset = ue->u.adapter.summary_offset;
2116 		e->adapter.ind_offset = ue->u.adapter.ind_offset;
2117 		e->adapter.adapter_id = ue->u.adapter.adapter_id;
2118 		ret = 0;
2119 		break;
2120 	default:
2121 		ret = -EINVAL;
2122 	}
2123 
2124 	return ret;
2125 }
2126 
kvm_set_msi(struct kvm_kernel_irq_routing_entry * e,struct kvm * kvm,int irq_source_id,int level,bool line_status)2127 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2128 		int irq_source_id, int level, bool line_status)
2129 {
2130 	return -EINVAL;
2131 }
2132 
kvm_s390_set_irq_state(struct kvm_vcpu * vcpu,void __user * irqstate,int len)2133 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2134 {
2135 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2136 	struct kvm_s390_irq *buf;
2137 	int r = 0;
2138 	int n;
2139 
2140 	buf = vmalloc(len);
2141 	if (!buf)
2142 		return -ENOMEM;
2143 
2144 	if (copy_from_user((void *) buf, irqstate, len)) {
2145 		r = -EFAULT;
2146 		goto out_free;
2147 	}
2148 
2149 	/*
2150 	 * Don't allow setting the interrupt state
2151 	 * when there are already interrupts pending
2152 	 */
2153 	spin_lock(&li->lock);
2154 	if (li->pending_irqs) {
2155 		r = -EBUSY;
2156 		goto out_unlock;
2157 	}
2158 
2159 	for (n = 0; n < len / sizeof(*buf); n++) {
2160 		r = do_inject_vcpu(vcpu, &buf[n]);
2161 		if (r)
2162 			break;
2163 	}
2164 
2165 out_unlock:
2166 	spin_unlock(&li->lock);
2167 out_free:
2168 	vfree(buf);
2169 
2170 	return r;
2171 }
2172 
store_local_irq(struct kvm_s390_local_interrupt * li,struct kvm_s390_irq * irq,unsigned long irq_type)2173 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2174 			    struct kvm_s390_irq *irq,
2175 			    unsigned long irq_type)
2176 {
2177 	switch (irq_type) {
2178 	case IRQ_PEND_MCHK_EX:
2179 	case IRQ_PEND_MCHK_REP:
2180 		irq->type = KVM_S390_MCHK;
2181 		irq->u.mchk = li->irq.mchk;
2182 		break;
2183 	case IRQ_PEND_PROG:
2184 		irq->type = KVM_S390_PROGRAM_INT;
2185 		irq->u.pgm = li->irq.pgm;
2186 		break;
2187 	case IRQ_PEND_PFAULT_INIT:
2188 		irq->type = KVM_S390_INT_PFAULT_INIT;
2189 		irq->u.ext = li->irq.ext;
2190 		break;
2191 	case IRQ_PEND_EXT_EXTERNAL:
2192 		irq->type = KVM_S390_INT_EXTERNAL_CALL;
2193 		irq->u.extcall = li->irq.extcall;
2194 		break;
2195 	case IRQ_PEND_EXT_CLOCK_COMP:
2196 		irq->type = KVM_S390_INT_CLOCK_COMP;
2197 		break;
2198 	case IRQ_PEND_EXT_CPU_TIMER:
2199 		irq->type = KVM_S390_INT_CPU_TIMER;
2200 		break;
2201 	case IRQ_PEND_SIGP_STOP:
2202 		irq->type = KVM_S390_SIGP_STOP;
2203 		irq->u.stop = li->irq.stop;
2204 		break;
2205 	case IRQ_PEND_RESTART:
2206 		irq->type = KVM_S390_RESTART;
2207 		break;
2208 	case IRQ_PEND_SET_PREFIX:
2209 		irq->type = KVM_S390_SIGP_SET_PREFIX;
2210 		irq->u.prefix = li->irq.prefix;
2211 		break;
2212 	}
2213 }
2214 
kvm_s390_get_irq_state(struct kvm_vcpu * vcpu,__u8 __user * buf,int len)2215 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2216 {
2217 	uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
2218 	unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2219 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2220 	unsigned long pending_irqs;
2221 	struct kvm_s390_irq irq;
2222 	unsigned long irq_type;
2223 	int cpuaddr;
2224 	int n = 0;
2225 
2226 	spin_lock(&li->lock);
2227 	pending_irqs = li->pending_irqs;
2228 	memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2229 	       sizeof(sigp_emerg_pending));
2230 	spin_unlock(&li->lock);
2231 
2232 	for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2233 		memset(&irq, 0, sizeof(irq));
2234 		if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2235 			continue;
2236 		if (n + sizeof(irq) > len)
2237 			return -ENOBUFS;
2238 		store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2239 		if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2240 			return -EFAULT;
2241 		n += sizeof(irq);
2242 	}
2243 
2244 	if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2245 		for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2246 			memset(&irq, 0, sizeof(irq));
2247 			if (n + sizeof(irq) > len)
2248 				return -ENOBUFS;
2249 			irq.type = KVM_S390_INT_EMERGENCY;
2250 			irq.u.emerg.code = cpuaddr;
2251 			if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2252 				return -EFAULT;
2253 			n += sizeof(irq);
2254 		}
2255 	}
2256 
2257 	if ((sigp_ctrl & SIGP_CTRL_C) &&
2258 	    (atomic_read(&vcpu->arch.sie_block->cpuflags) &
2259 	     CPUSTAT_ECALL_PEND)) {
2260 		if (n + sizeof(irq) > len)
2261 			return -ENOBUFS;
2262 		memset(&irq, 0, sizeof(irq));
2263 		irq.type = KVM_S390_INT_EXTERNAL_CALL;
2264 		irq.u.extcall.code = sigp_ctrl & SIGP_CTRL_SCN_MASK;
2265 		if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2266 			return -EFAULT;
2267 		n += sizeof(irq);
2268 	}
2269 
2270 	return n;
2271 }
2272