2 * QEMU S390x KVM implementation
5 * Copyright IBM Corp. 2012
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * Contributions after 2012-10-29 are licensed under the terms of the
18 * GNU GPL, version 2 or (at your option) any later version.
20 * You should have received a copy of the GNU (Lesser) General Public
21 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
24 #include <sys/types.h>
25 #include <sys/ioctl.h>
28 #include <linux/kvm.h>
29 #include <asm/ptrace.h>
31 #include "qemu-common.h"
32 #include "qemu/timer.h"
33 #include "sysemu/sysemu.h"
34 #include "sysemu/kvm.h"
36 #include "sysemu/device_tree.h"
38 /* #define DEBUG_KVM */
41 #define dprintf(fmt, ...) \
42 do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
44 #define dprintf(fmt, ...) \
48 #define IPA0_DIAG 0x8300
49 #define IPA0_SIGP 0xae00
50 #define IPA0_PRIV 0xb200
52 #define PRIV_SCLP_CALL 0x20
53 #define DIAG_KVM_HYPERCALL 0x500
54 #define DIAG_KVM_BREAKPOINT 0x501
56 #define ICPT_INSTRUCTION 0x04
57 #define ICPT_WAITPSW 0x1c
58 #define ICPT_SOFT_INTERCEPT 0x24
59 #define ICPT_CPU_STOP 0x28
62 #define SIGP_RESTART 0x06
63 #define SIGP_INITIAL_CPU_RESET 0x0b
64 #define SIGP_STORE_STATUS_ADDR 0x0e
65 #define SIGP_SET_ARCH 0x12
67 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
71 static int cap_sync_regs;
73 int kvm_arch_init(KVMState *s)
75 cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);
79 unsigned long kvm_arch_vcpu_id(CPUState *cpu)
81 return cpu->cpu_index;
84 int kvm_arch_init_vcpu(CPUState *cpu)
88 if (kvm_vcpu_ioctl(cpu, KVM_S390_INITIAL_RESET, NULL) < 0) {
89 perror("cannot init reset vcpu");
95 void kvm_arch_reset_vcpu(CPUState *cpu)
97 /* The initial reset call is needed here to reset in-kernel
98 * vcpu data that we can't access directly from QEMU
99 * (i.e. with older kernels which don't support sync_regs/ONE_REG).
100 * Before this ioctl cpu_synchronize_state() is called in common kvm
102 if (kvm_vcpu_ioctl(cpu, KVM_S390_INITIAL_RESET, NULL)) {
103 perror("Can't reset vcpu\n");
107 int kvm_arch_put_registers(CPUState *cs, int level)
109 S390CPU *cpu = S390_CPU(cs);
110 CPUS390XState *env = &cpu->env;
111 struct kvm_sregs sregs;
112 struct kvm_regs regs;
116 /* always save the PSW and the GPRS*/
117 cs->kvm_run->psw_addr = env->psw.addr;
118 cs->kvm_run->psw_mask = env->psw.mask;
120 if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
121 for (i = 0; i < 16; i++) {
122 cs->kvm_run->s.regs.gprs[i] = env->regs[i];
123 cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_GPRS;
126 for (i = 0; i < 16; i++) {
127 regs.gprs[i] = env->regs[i];
129 ret = kvm_vcpu_ioctl(cs, KVM_SET_REGS, ®s);
135 /* Do we need to save more than that? */
136 if (level == KVM_PUT_RUNTIME_STATE) {
141 cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
142 cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
143 for (i = 0; i < 16; i++) {
144 cs->kvm_run->s.regs.acrs[i] = env->aregs[i];
145 cs->kvm_run->s.regs.crs[i] = env->cregs[i];
147 cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS;
148 cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS;
150 for (i = 0; i < 16; i++) {
151 sregs.acrs[i] = env->aregs[i];
152 sregs.crs[i] = env->cregs[i];
154 ret = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs);
160 /* Finally the prefix */
161 if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
162 cs->kvm_run->s.regs.prefix = env->psa;
163 cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX;
165 /* prefix is only supported via sync regs */
170 int kvm_arch_get_registers(CPUState *cs)
172 S390CPU *cpu = S390_CPU(cs);
173 CPUS390XState *env = &cpu->env;
174 struct kvm_sregs sregs;
175 struct kvm_regs regs;
180 env->psw.addr = cs->kvm_run->psw_addr;
181 env->psw.mask = cs->kvm_run->psw_mask;
184 if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
185 for (i = 0; i < 16; i++) {
186 env->regs[i] = cs->kvm_run->s.regs.gprs[i];
189 ret = kvm_vcpu_ioctl(cs, KVM_GET_REGS, ®s);
193 for (i = 0; i < 16; i++) {
194 env->regs[i] = regs.gprs[i];
198 /* The ACRS and CRS */
200 cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
201 cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
202 for (i = 0; i < 16; i++) {
203 env->aregs[i] = cs->kvm_run->s.regs.acrs[i];
204 env->cregs[i] = cs->kvm_run->s.regs.crs[i];
207 ret = kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs);
211 for (i = 0; i < 16; i++) {
212 env->aregs[i] = sregs.acrs[i];
213 env->cregs[i] = sregs.crs[i];
217 /* Finally the prefix */
218 if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
219 env->psa = cs->kvm_run->s.regs.prefix;
221 /* no prefix without sync regs */
228 * Legacy layout for s390:
229 * Older S390 KVM requires the topmost vma of the RAM to be
230 * smaller than an system defined value, which is at least 256GB.
231 * Larger systems have larger values. We put the guest between
232 * the end of data segment (system break) and this value. We
233 * use 32GB as a base to have enough room for the system break
234 * to grow. We also have to use MAP parameters that avoid
235 * read-only mapping of guest pages.
237 static void *legacy_s390_alloc(ram_addr_t size)
241 mem = mmap((void *) 0x800000000ULL, size,
242 PROT_EXEC|PROT_READ|PROT_WRITE,
243 MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
244 if (mem == MAP_FAILED) {
245 fprintf(stderr, "Allocating RAM failed\n");
251 void *kvm_arch_vmalloc(ram_addr_t size)
253 /* Can we use the standard allocation ? */
254 if (kvm_check_extension(kvm_state, KVM_CAP_S390_GMAP) &&
255 kvm_check_extension(kvm_state, KVM_CAP_S390_COW)) {
258 return legacy_s390_alloc(size);
262 int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
264 S390CPU *cpu = S390_CPU(cs);
265 CPUS390XState *env = &cpu->env;
266 static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
268 if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
269 cpu_memory_rw_debug(env, bp->pc, (uint8_t *)diag_501, 4, 1)) {
275 int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
277 S390CPU *cpu = S390_CPU(cs);
278 CPUS390XState *env = &cpu->env;
280 static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
282 if (cpu_memory_rw_debug(env, bp->pc, t, 4, 0)) {
284 } else if (memcmp(t, diag_501, 4)) {
286 } else if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
293 void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
297 void kvm_arch_post_run(CPUState *cpu, struct kvm_run *run)
301 int kvm_arch_process_async_events(CPUState *cs)
303 S390CPU *cpu = S390_CPU(cs);
304 return cpu->env.halted;
307 void kvm_s390_interrupt_internal(S390CPU *cpu, int type, uint32_t parm,
308 uint64_t parm64, int vm)
310 CPUState *cs = CPU(cpu);
311 struct kvm_s390_interrupt kvmint;
314 if (!cs->kvm_state) {
320 kvmint.parm64 = parm64;
323 r = kvm_vm_ioctl(cs->kvm_state, KVM_S390_INTERRUPT, &kvmint);
325 r = kvm_vcpu_ioctl(cs, KVM_S390_INTERRUPT, &kvmint);
329 fprintf(stderr, "KVM failed to inject interrupt\n");
334 void kvm_s390_virtio_irq(S390CPU *cpu, int config_change, uint64_t token)
336 kvm_s390_interrupt_internal(cpu, KVM_S390_INT_VIRTIO, config_change,
340 void kvm_s390_interrupt(S390CPU *cpu, int type, uint32_t code)
342 kvm_s390_interrupt_internal(cpu, type, code, 0, 0);
345 static void enter_pgmcheck(S390CPU *cpu, uint16_t code)
347 kvm_s390_interrupt(cpu, KVM_S390_PROGRAM_INT, code);
350 static inline void setcc(S390CPU *cpu, uint64_t cc)
352 CPUS390XState *env = &cpu->env;
353 CPUState *cs = CPU(cpu);
355 cs->kvm_run->psw_mask &= ~(3ull << 44);
356 cs->kvm_run->psw_mask |= (cc & 3) << 44;
358 env->psw.mask &= ~(3ul << 44);
359 env->psw.mask |= (cc & 3) << 44;
362 static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
365 CPUS390XState *env = &cpu->env;
370 cpu_synchronize_state(env);
371 sccb = env->regs[ipbh0 & 0xf];
372 code = env->regs[(ipbh0 & 0xf0) >> 4];
374 r = sclp_service_call(sccb, code);
376 enter_pgmcheck(cpu, -r);
383 static int handle_priv(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
386 uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
388 dprintf("KVM: PRIV: %d\n", ipa1);
391 r = kvm_sclp_service_call(cpu, run, ipbh0);
394 dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
402 static int handle_hypercall(CPUS390XState *env, struct kvm_run *run)
404 cpu_synchronize_state(env);
405 env->regs[2] = s390_virtio_hypercall(env);
410 static int handle_diag(CPUS390XState *env, struct kvm_run *run, int ipb_code)
415 case DIAG_KVM_HYPERCALL:
416 r = handle_hypercall(env, run);
418 case DIAG_KVM_BREAKPOINT:
422 dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
430 static int s390_cpu_restart(S390CPU *cpu)
432 CPUS390XState *env = &cpu->env;
434 kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);
435 s390_add_running_cpu(env);
436 qemu_cpu_kick(CPU(cpu));
437 dprintf("DONE: SIGP cpu restart: %p\n", env);
441 static int s390_store_status(CPUS390XState *env, uint32_t parameter)
444 fprintf(stderr, "XXX SIGP store status\n");
448 static int s390_cpu_initial_reset(S390CPU *cpu)
450 CPUS390XState *env = &cpu->env;
453 s390_del_running_cpu(env);
454 if (kvm_vcpu_ioctl(CPU(cpu), KVM_S390_INITIAL_RESET, NULL) < 0) {
455 perror("cannot init reset vcpu");
458 /* Manually zero out all registers */
459 cpu_synchronize_state(env);
460 for (i = 0; i < 16; i++) {
464 dprintf("DONE: SIGP initial reset: %p\n", env);
468 static int handle_sigp(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
470 CPUS390XState *env = &cpu->env;
477 CPUS390XState *target_env;
479 cpu_synchronize_state(env);
482 order_code = run->s390_sieic.ipb >> 28;
483 if (order_code > 0) {
484 order_code = env->regs[order_code];
486 order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
489 t = (ipa1 & 0xf0) >> 4;
494 parameter = env->regs[t] & 0x7ffffe00;
495 cpu_addr = env->regs[ipa1 & 0x0f];
497 target_cpu = s390_cpu_addr2state(cpu_addr);
498 if (target_cpu == NULL) {
501 target_env = &target_cpu->env;
503 switch (order_code) {
505 r = s390_cpu_restart(target_cpu);
507 case SIGP_STORE_STATUS_ADDR:
508 r = s390_store_status(target_env, parameter);
511 /* make the caller panic */
513 case SIGP_INITIAL_CPU_RESET:
514 r = s390_cpu_initial_reset(target_cpu);
517 fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
522 setcc(cpu, r ? 3 : 0);
526 static int handle_instruction(S390CPU *cpu, struct kvm_run *run)
528 CPUS390XState *env = &cpu->env;
529 unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
530 uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
531 int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
534 dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
537 r = handle_priv(cpu, run, ipa1);
540 r = handle_diag(env, run, ipb_code);
543 r = handle_sigp(cpu, run, ipa1);
548 enter_pgmcheck(cpu, 0x0001);
553 static bool is_special_wait_psw(CPUState *cs)
556 return cs->kvm_run->psw_addr == 0xfffUL;
559 static int handle_intercept(S390CPU *cpu)
561 CPUS390XState *env = &cpu->env;
562 CPUState *cs = CPU(cpu);
563 struct kvm_run *run = cs->kvm_run;
564 int icpt_code = run->s390_sieic.icptcode;
567 dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
568 (long)cs->kvm_run->psw_addr);
570 case ICPT_INSTRUCTION:
571 r = handle_instruction(cpu, run);
574 if (s390_del_running_cpu(env) == 0 &&
575 is_special_wait_psw(cs)) {
576 qemu_system_shutdown_request();
581 if (s390_del_running_cpu(env) == 0) {
582 qemu_system_shutdown_request();
586 case ICPT_SOFT_INTERCEPT:
587 fprintf(stderr, "KVM unimplemented icpt SOFT\n");
591 fprintf(stderr, "KVM unimplemented icpt IO\n");
595 fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
603 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
605 S390CPU *cpu = S390_CPU(cs);
608 switch (run->exit_reason) {
609 case KVM_EXIT_S390_SIEIC:
610 ret = handle_intercept(cpu);
612 case KVM_EXIT_S390_RESET:
613 qemu_system_reset_request();
616 fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
621 ret = EXCP_INTERRUPT;
626 bool kvm_arch_stop_on_emulation_error(CPUState *cpu)
631 int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
636 int kvm_arch_on_sigbus(int code, void *addr)