2 * QEMU S390x KVM implementation
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
20 #include <sys/types.h>
21 #include <sys/ioctl.h>
24 #include <linux/kvm.h>
25 #include <asm/ptrace.h>
27 #include "qemu-common.h"
28 #include "qemu-timer.h"
32 #include "device_tree.h"
34 /* #define DEBUG_KVM */
37 #define dprintf(fmt, ...) \
38 do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
40 #define dprintf(fmt, ...) \
44 #define IPA0_DIAG 0x8300
45 #define IPA0_SIGP 0xae00
46 #define IPA0_PRIV 0xb200
48 #define PRIV_SCLP_CALL 0x20
49 #define DIAG_KVM_HYPERCALL 0x500
50 #define DIAG_KVM_BREAKPOINT 0x501
52 #define ICPT_INSTRUCTION 0x04
53 #define ICPT_WAITPSW 0x1c
54 #define ICPT_SOFT_INTERCEPT 0x24
55 #define ICPT_CPU_STOP 0x28
58 #define SIGP_RESTART 0x06
59 #define SIGP_INITIAL_CPU_RESET 0x0b
60 #define SIGP_STORE_STATUS_ADDR 0x0e
61 #define SIGP_SET_ARCH 0x12
63 #define SCLP_CMDW_READ_SCP_INFO 0x00020001
64 #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
66 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
70 int kvm_arch_init(KVMState *s)
75 int kvm_arch_init_vcpu(CPUS390XState *env)
79 if (kvm_vcpu_ioctl(env, KVM_S390_INITIAL_RESET, NULL) < 0) {
80 perror("cannot init reset vcpu");
86 void kvm_arch_reset_vcpu(CPUS390XState *env)
88 /* FIXME: add code to reset vcpu. */
91 int kvm_arch_put_registers(CPUS390XState *env, int level)
97 ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, ®s);
102 for (i = 0; i < 16; i++) {
103 regs.gprs[i] = env->regs[i];
106 ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, ®s);
111 env->kvm_run->psw_addr = env->psw.addr;
112 env->kvm_run->psw_mask = env->psw.mask;
117 int kvm_arch_get_registers(CPUS390XState *env)
120 struct kvm_regs regs;
123 ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, ®s);
128 for (i = 0; i < 16; i++) {
129 env->regs[i] = regs.gprs[i];
132 env->psw.addr = env->kvm_run->psw_addr;
133 env->psw.mask = env->kvm_run->psw_mask;
139 * Legacy layout for s390:
140 * Older S390 KVM requires the topmost vma of the RAM to be
141 * smaller than an system defined value, which is at least 256GB.
142 * Larger systems have larger values. We put the guest between
143 * the end of data segment (system break) and this value. We
144 * use 32GB as a base to have enough room for the system break
145 * to grow. We also have to use MAP parameters that avoid
146 * read-only mapping of guest pages.
148 static void *legacy_s390_alloc(ram_addr_t size)
152 mem = mmap((void *) 0x800000000ULL, size,
153 PROT_EXEC|PROT_READ|PROT_WRITE,
154 MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
155 if (mem == MAP_FAILED) {
156 fprintf(stderr, "Allocating RAM failed\n");
162 void *kvm_arch_vmalloc(ram_addr_t size)
164 /* Can we use the standard allocation ? */
165 if (kvm_check_extension(kvm_state, KVM_CAP_S390_GMAP) &&
166 kvm_check_extension(kvm_state, KVM_CAP_S390_COW)) {
169 return legacy_s390_alloc(size);
173 int kvm_arch_insert_sw_breakpoint(CPUS390XState *env, struct kvm_sw_breakpoint *bp)
175 static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
177 if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
178 cpu_memory_rw_debug(env, bp->pc, (uint8_t *)diag_501, 4, 1)) {
184 int kvm_arch_remove_sw_breakpoint(CPUS390XState *env, struct kvm_sw_breakpoint *bp)
187 static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
189 if (cpu_memory_rw_debug(env, bp->pc, t, 4, 0)) {
191 } else if (memcmp(t, diag_501, 4)) {
193 } else if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
200 void kvm_arch_pre_run(CPUS390XState *env, struct kvm_run *run)
204 void kvm_arch_post_run(CPUS390XState *env, struct kvm_run *run)
208 int kvm_arch_process_async_events(CPUS390XState *env)
213 void kvm_s390_interrupt_internal(CPUS390XState *env, int type, uint32_t parm,
214 uint64_t parm64, int vm)
216 struct kvm_s390_interrupt kvmint;
219 if (!env->kvm_state) {
225 kvmint.parm64 = parm64;
228 r = kvm_vm_ioctl(env->kvm_state, KVM_S390_INTERRUPT, &kvmint);
230 r = kvm_vcpu_ioctl(env, KVM_S390_INTERRUPT, &kvmint);
234 fprintf(stderr, "KVM failed to inject interrupt\n");
239 void kvm_s390_virtio_irq(CPUS390XState *env, int config_change, uint64_t token)
241 kvm_s390_interrupt_internal(env, KVM_S390_INT_VIRTIO, config_change,
245 void kvm_s390_interrupt(CPUS390XState *env, int type, uint32_t code)
247 kvm_s390_interrupt_internal(env, type, code, 0, 0);
250 static void enter_pgmcheck(CPUS390XState *env, uint16_t code)
252 kvm_s390_interrupt(env, KVM_S390_PROGRAM_INT, code);
255 static inline void setcc(CPUS390XState *env, uint64_t cc)
257 env->kvm_run->psw_mask &= ~(3ull << 44);
258 env->kvm_run->psw_mask |= (cc & 3) << 44;
260 env->psw.mask &= ~(3ul << 44);
261 env->psw.mask |= (cc & 3) << 44;
264 static int kvm_sclp_service_call(CPUS390XState *env, struct kvm_run *run,
271 cpu_synchronize_state(env);
272 sccb = env->regs[ipbh0 & 0xf];
273 code = env->regs[(ipbh0 & 0xf0) >> 4];
275 r = sclp_service_call(env, sccb, code);
283 static int handle_priv(CPUS390XState *env, struct kvm_run *run, uint8_t ipa1)
286 uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
288 dprintf("KVM: PRIV: %d\n", ipa1);
291 r = kvm_sclp_service_call(env, run, ipbh0);
294 dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
302 static int handle_hypercall(CPUS390XState *env, struct kvm_run *run)
304 cpu_synchronize_state(env);
305 env->regs[2] = s390_virtio_hypercall(env, env->regs[2], env->regs[1]);
310 static int handle_diag(CPUS390XState *env, struct kvm_run *run, int ipb_code)
315 case DIAG_KVM_HYPERCALL:
316 r = handle_hypercall(env, run);
318 case DIAG_KVM_BREAKPOINT:
322 dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
330 static int s390_cpu_restart(S390CPU *cpu)
332 CPUS390XState *env = &cpu->env;
334 kvm_s390_interrupt(env, KVM_S390_RESTART, 0);
335 s390_add_running_cpu(env);
337 dprintf("DONE: SIGP cpu restart: %p\n", env);
341 static int s390_store_status(CPUS390XState *env, uint32_t parameter)
344 fprintf(stderr, "XXX SIGP store status\n");
348 static int s390_cpu_initial_reset(CPUS390XState *env)
352 s390_del_running_cpu(env);
353 if (kvm_vcpu_ioctl(env, KVM_S390_INITIAL_RESET, NULL) < 0) {
354 perror("cannot init reset vcpu");
357 /* Manually zero out all registers */
358 cpu_synchronize_state(env);
359 for (i = 0; i < 16; i++) {
363 dprintf("DONE: SIGP initial reset: %p\n", env);
367 static int handle_sigp(CPUS390XState *env, struct kvm_run *run, uint8_t ipa1)
375 CPUS390XState *target_env;
377 cpu_synchronize_state(env);
380 order_code = run->s390_sieic.ipb >> 28;
381 if (order_code > 0) {
382 order_code = env->regs[order_code];
384 order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
387 t = (ipa1 & 0xf0) >> 4;
392 parameter = env->regs[t] & 0x7ffffe00;
393 cpu_addr = env->regs[ipa1 & 0x0f];
395 target_cpu = s390_cpu_addr2state(cpu_addr);
396 if (target_cpu == NULL) {
399 target_env = &target_cpu->env;
401 switch (order_code) {
403 r = s390_cpu_restart(target_cpu);
405 case SIGP_STORE_STATUS_ADDR:
406 r = s390_store_status(target_env, parameter);
409 /* make the caller panic */
411 case SIGP_INITIAL_CPU_RESET:
412 r = s390_cpu_initial_reset(target_env);
415 fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
420 setcc(env, r ? 3 : 0);
424 static int handle_instruction(CPUS390XState *env, struct kvm_run *run)
426 unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
427 uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
428 int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
431 dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
434 r = handle_priv(env, run, ipa1);
437 r = handle_diag(env, run, ipb_code);
440 r = handle_sigp(env, run, ipa1);
445 enter_pgmcheck(env, 0x0001);
450 static bool is_special_wait_psw(CPUS390XState *env)
453 return env->kvm_run->psw_addr == 0xfffUL;
456 static int handle_intercept(CPUS390XState *env)
458 struct kvm_run *run = env->kvm_run;
459 int icpt_code = run->s390_sieic.icptcode;
462 dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
463 (long)env->kvm_run->psw_addr);
465 case ICPT_INSTRUCTION:
466 r = handle_instruction(env, run);
469 if (s390_del_running_cpu(env) == 0 &&
470 is_special_wait_psw(env)) {
471 qemu_system_shutdown_request();
476 if (s390_del_running_cpu(env) == 0) {
477 qemu_system_shutdown_request();
481 case ICPT_SOFT_INTERCEPT:
482 fprintf(stderr, "KVM unimplemented icpt SOFT\n");
486 fprintf(stderr, "KVM unimplemented icpt IO\n");
490 fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
498 int kvm_arch_handle_exit(CPUS390XState *env, struct kvm_run *run)
502 switch (run->exit_reason) {
503 case KVM_EXIT_S390_SIEIC:
504 ret = handle_intercept(env);
506 case KVM_EXIT_S390_RESET:
507 qemu_system_reset_request();
510 fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
515 ret = EXCP_INTERRUPT;
520 bool kvm_arch_stop_on_emulation_error(CPUS390XState *env)
525 int kvm_arch_on_sigbus_vcpu(CPUS390XState *env, int code, void *addr)
530 int kvm_arch_on_sigbus(int code, void *addr)