| /* |
| * s390x SIGP instruction handling |
| * |
| * Copyright (c) 2009 Alexander Graf <agraf@suse.de> |
| * Copyright IBM Corp. 2012 |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| * See the COPYING file in the top-level directory. |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "qemu-common.h" |
| #include "cpu.h" |
| #include "internal.h" |
| #include "sysemu/hw_accel.h" |
| #include "exec/address-spaces.h" |
| #include "exec/exec-all.h" |
| #include "sysemu/sysemu.h" |
| #include "trace.h" |
| #include "qapi/qapi-types-misc.h" |
| |
| QemuMutex qemu_sigp_mutex; |
| |
| typedef struct SigpInfo { |
| uint64_t param; |
| int cc; |
| uint64_t *status_reg; |
| } SigpInfo; |
| |
| static void set_sigp_status(SigpInfo *si, uint64_t status) |
| { |
| *si->status_reg &= 0xffffffff00000000ULL; |
| *si->status_reg |= status; |
| si->cc = SIGP_CC_STATUS_STORED; |
| } |
| |
| static void sigp_sense(S390CPU *dst_cpu, SigpInfo *si) |
| { |
| uint8_t state = s390_cpu_get_state(dst_cpu); |
| bool ext_call = dst_cpu->env.pending_int & INTERRUPT_EXTERNAL_CALL; |
| uint64_t status = 0; |
| |
| if (!tcg_enabled()) { |
| /* handled in KVM */ |
| set_sigp_status(si, SIGP_STAT_INVALID_ORDER); |
| return; |
| } |
| |
| /* sensing without locks is racy, but it's the same for real hw */ |
| if (state != S390_CPU_STATE_STOPPED && !ext_call) { |
| si->cc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| } else { |
| if (ext_call) { |
| status |= SIGP_STAT_EXT_CALL_PENDING; |
| } |
| if (state == S390_CPU_STATE_STOPPED) { |
| status |= SIGP_STAT_STOPPED; |
| } |
| set_sigp_status(si, status); |
| } |
| } |
| |
| static void sigp_external_call(S390CPU *src_cpu, S390CPU *dst_cpu, SigpInfo *si) |
| { |
| int ret; |
| |
| if (!tcg_enabled()) { |
| /* handled in KVM */ |
| set_sigp_status(si, SIGP_STAT_INVALID_ORDER); |
| return; |
| } |
| |
| ret = cpu_inject_external_call(dst_cpu, src_cpu->env.core_id); |
| if (!ret) { |
| si->cc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| } else { |
| set_sigp_status(si, SIGP_STAT_EXT_CALL_PENDING); |
| } |
| } |
| |
| static void sigp_emergency(S390CPU *src_cpu, S390CPU *dst_cpu, SigpInfo *si) |
| { |
| if (!tcg_enabled()) { |
| /* handled in KVM */ |
| set_sigp_status(si, SIGP_STAT_INVALID_ORDER); |
| return; |
| } |
| |
| cpu_inject_emergency_signal(dst_cpu, src_cpu->env.core_id); |
| si->cc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| } |
| |
| static void sigp_start(CPUState *cs, run_on_cpu_data arg) |
| { |
| S390CPU *cpu = S390_CPU(cs); |
| SigpInfo *si = arg.host_ptr; |
| |
| if (s390_cpu_get_state(cpu) != S390_CPU_STATE_STOPPED) { |
| si->cc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| return; |
| } |
| |
| s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu); |
| si->cc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| } |
| |
| static void sigp_stop(CPUState *cs, run_on_cpu_data arg) |
| { |
| S390CPU *cpu = S390_CPU(cs); |
| SigpInfo *si = arg.host_ptr; |
| |
| if (s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING) { |
| si->cc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| return; |
| } |
| |
| /* disabled wait - sleeping in user space */ |
| if (cs->halted) { |
| s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu); |
| } else { |
| /* execute the stop function */ |
| cpu->env.sigp_order = SIGP_STOP; |
| cpu_inject_stop(cpu); |
| } |
| si->cc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| } |
| |
| static void sigp_stop_and_store_status(CPUState *cs, run_on_cpu_data arg) |
| { |
| S390CPU *cpu = S390_CPU(cs); |
| SigpInfo *si = arg.host_ptr; |
| |
| /* disabled wait - sleeping in user space */ |
| if (s390_cpu_get_state(cpu) == S390_CPU_STATE_OPERATING && cs->halted) { |
| s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu); |
| } |
| |
| switch (s390_cpu_get_state(cpu)) { |
| case S390_CPU_STATE_OPERATING: |
| cpu->env.sigp_order = SIGP_STOP_STORE_STATUS; |
| cpu_inject_stop(cpu); |
| /* store will be performed in do_stop_interrup() */ |
| break; |
| case S390_CPU_STATE_STOPPED: |
| /* already stopped, just store the status */ |
| cpu_synchronize_state(cs); |
| s390_store_status(cpu, S390_STORE_STATUS_DEF_ADDR, true); |
| break; |
| } |
| si->cc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| } |
| |
| static void sigp_store_status_at_address(CPUState *cs, run_on_cpu_data arg) |
| { |
| S390CPU *cpu = S390_CPU(cs); |
| SigpInfo *si = arg.host_ptr; |
| uint32_t address = si->param & 0x7ffffe00u; |
| |
| /* cpu has to be stopped */ |
| if (s390_cpu_get_state(cpu) != S390_CPU_STATE_STOPPED) { |
| set_sigp_status(si, SIGP_STAT_INCORRECT_STATE); |
| return; |
| } |
| |
| cpu_synchronize_state(cs); |
| |
| if (s390_store_status(cpu, address, false)) { |
| set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER); |
| return; |
| } |
| si->cc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| } |
| |
| #define ADTL_SAVE_LC_MASK 0xfUL |
| static void sigp_store_adtl_status(CPUState *cs, run_on_cpu_data arg) |
| { |
| S390CPU *cpu = S390_CPU(cs); |
| SigpInfo *si = arg.host_ptr; |
| uint8_t lc = si->param & ADTL_SAVE_LC_MASK; |
| hwaddr addr = si->param & ~ADTL_SAVE_LC_MASK; |
| hwaddr len = 1UL << (lc ? lc : 10); |
| |
| if (!s390_has_feat(S390_FEAT_VECTOR) && |
| !s390_has_feat(S390_FEAT_GUARDED_STORAGE)) { |
| set_sigp_status(si, SIGP_STAT_INVALID_ORDER); |
| return; |
| } |
| |
| /* cpu has to be stopped */ |
| if (s390_cpu_get_state(cpu) != S390_CPU_STATE_STOPPED) { |
| set_sigp_status(si, SIGP_STAT_INCORRECT_STATE); |
| return; |
| } |
| |
| /* address must be aligned to length */ |
| if (addr & (len - 1)) { |
| set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER); |
| return; |
| } |
| |
| /* no GS: only lc == 0 is valid */ |
| if (!s390_has_feat(S390_FEAT_GUARDED_STORAGE) && |
| lc != 0) { |
| set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER); |
| return; |
| } |
| |
| /* GS: 0, 10, 11, 12 are valid */ |
| if (s390_has_feat(S390_FEAT_GUARDED_STORAGE) && |
| lc != 0 && |
| lc != 10 && |
| lc != 11 && |
| lc != 12) { |
| set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER); |
| return; |
| } |
| |
| cpu_synchronize_state(cs); |
| |
| if (s390_store_adtl_status(cpu, addr, len)) { |
| set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER); |
| return; |
| } |
| si->cc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| } |
| |
| static void sigp_restart(CPUState *cs, run_on_cpu_data arg) |
| { |
| S390CPU *cpu = S390_CPU(cs); |
| SigpInfo *si = arg.host_ptr; |
| |
| switch (s390_cpu_get_state(cpu)) { |
| case S390_CPU_STATE_STOPPED: |
| /* the restart irq has to be delivered prior to any other pending irq */ |
| cpu_synchronize_state(cs); |
| /* |
| * Set OPERATING (and unhalting) before loading the restart PSW. |
| * load_psw() will then properly halt the CPU again if necessary (TCG). |
| */ |
| s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu); |
| do_restart_interrupt(&cpu->env); |
| break; |
| case S390_CPU_STATE_OPERATING: |
| cpu_inject_restart(cpu); |
| break; |
| } |
| si->cc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| } |
| |
| static void sigp_initial_cpu_reset(CPUState *cs, run_on_cpu_data arg) |
| { |
| S390CPU *cpu = S390_CPU(cs); |
| S390CPUClass *scc = S390_CPU_GET_CLASS(cpu); |
| SigpInfo *si = arg.host_ptr; |
| |
| cpu_synchronize_state(cs); |
| scc->initial_cpu_reset(cs); |
| cpu_synchronize_post_reset(cs); |
| si->cc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| } |
| |
| static void sigp_cpu_reset(CPUState *cs, run_on_cpu_data arg) |
| { |
| S390CPU *cpu = S390_CPU(cs); |
| S390CPUClass *scc = S390_CPU_GET_CLASS(cpu); |
| SigpInfo *si = arg.host_ptr; |
| |
| cpu_synchronize_state(cs); |
| scc->cpu_reset(cs); |
| cpu_synchronize_post_reset(cs); |
| si->cc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| } |
| |
| static void sigp_set_prefix(CPUState *cs, run_on_cpu_data arg) |
| { |
| S390CPU *cpu = S390_CPU(cs); |
| SigpInfo *si = arg.host_ptr; |
| uint32_t addr = si->param & 0x7fffe000u; |
| |
| cpu_synchronize_state(cs); |
| |
| if (!address_space_access_valid(&address_space_memory, addr, |
| sizeof(struct LowCore), false, |
| MEMTXATTRS_UNSPECIFIED)) { |
| set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER); |
| return; |
| } |
| |
| /* cpu has to be stopped */ |
| if (s390_cpu_get_state(cpu) != S390_CPU_STATE_STOPPED) { |
| set_sigp_status(si, SIGP_STAT_INCORRECT_STATE); |
| return; |
| } |
| |
| cpu->env.psa = addr; |
| tlb_flush(cs); |
| cpu_synchronize_post_init(cs); |
| si->cc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| } |
| |
| static void sigp_cond_emergency(S390CPU *src_cpu, S390CPU *dst_cpu, |
| SigpInfo *si) |
| { |
| const uint64_t psw_int_mask = PSW_MASK_IO | PSW_MASK_EXT; |
| uint16_t p_asn, s_asn, asn; |
| uint64_t psw_addr, psw_mask; |
| bool idle; |
| |
| if (!tcg_enabled()) { |
| /* handled in KVM */ |
| set_sigp_status(si, SIGP_STAT_INVALID_ORDER); |
| return; |
| } |
| |
| /* this looks racy, but these values are only used when STOPPED */ |
| idle = CPU(dst_cpu)->halted; |
| psw_addr = dst_cpu->env.psw.addr; |
| psw_mask = dst_cpu->env.psw.mask; |
| asn = si->param; |
| p_asn = dst_cpu->env.cregs[4] & 0xffff; /* Primary ASN */ |
| s_asn = dst_cpu->env.cregs[3] & 0xffff; /* Secondary ASN */ |
| |
| if (s390_cpu_get_state(dst_cpu) != S390_CPU_STATE_STOPPED || |
| (psw_mask & psw_int_mask) != psw_int_mask || |
| (idle && psw_addr != 0) || |
| (!idle && (asn == p_asn || asn == s_asn))) { |
| cpu_inject_emergency_signal(dst_cpu, src_cpu->env.core_id); |
| } else { |
| set_sigp_status(si, SIGP_STAT_INCORRECT_STATE); |
| } |
| |
| si->cc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| } |
| |
| static void sigp_sense_running(S390CPU *dst_cpu, SigpInfo *si) |
| { |
| if (!tcg_enabled()) { |
| /* handled in KVM */ |
| set_sigp_status(si, SIGP_STAT_INVALID_ORDER); |
| return; |
| } |
| |
| /* sensing without locks is racy, but it's the same for real hw */ |
| if (!s390_has_feat(S390_FEAT_SENSE_RUNNING_STATUS)) { |
| set_sigp_status(si, SIGP_STAT_INVALID_ORDER); |
| return; |
| } |
| |
| /* If halted (which includes also STOPPED), it is not running */ |
| if (CPU(dst_cpu)->halted) { |
| si->cc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| } else { |
| set_sigp_status(si, SIGP_STAT_NOT_RUNNING); |
| } |
| } |
| |
| static int handle_sigp_single_dst(S390CPU *cpu, S390CPU *dst_cpu, uint8_t order, |
| uint64_t param, uint64_t *status_reg) |
| { |
| SigpInfo si = { |
| .param = param, |
| .status_reg = status_reg, |
| }; |
| |
| /* cpu available? */ |
| if (dst_cpu == NULL) { |
| return SIGP_CC_NOT_OPERATIONAL; |
| } |
| |
| /* only resets can break pending orders */ |
| if (dst_cpu->env.sigp_order != 0 && |
| order != SIGP_CPU_RESET && |
| order != SIGP_INITIAL_CPU_RESET) { |
| return SIGP_CC_BUSY; |
| } |
| |
| switch (order) { |
| case SIGP_SENSE: |
| sigp_sense(dst_cpu, &si); |
| break; |
| case SIGP_EXTERNAL_CALL: |
| sigp_external_call(cpu, dst_cpu, &si); |
| break; |
| case SIGP_EMERGENCY: |
| sigp_emergency(cpu, dst_cpu, &si); |
| break; |
| case SIGP_START: |
| run_on_cpu(CPU(dst_cpu), sigp_start, RUN_ON_CPU_HOST_PTR(&si)); |
| break; |
| case SIGP_STOP: |
| run_on_cpu(CPU(dst_cpu), sigp_stop, RUN_ON_CPU_HOST_PTR(&si)); |
| break; |
| case SIGP_RESTART: |
| run_on_cpu(CPU(dst_cpu), sigp_restart, RUN_ON_CPU_HOST_PTR(&si)); |
| break; |
| case SIGP_STOP_STORE_STATUS: |
| run_on_cpu(CPU(dst_cpu), sigp_stop_and_store_status, RUN_ON_CPU_HOST_PTR(&si)); |
| break; |
| case SIGP_STORE_STATUS_ADDR: |
| run_on_cpu(CPU(dst_cpu), sigp_store_status_at_address, RUN_ON_CPU_HOST_PTR(&si)); |
| break; |
| case SIGP_STORE_ADTL_STATUS: |
| run_on_cpu(CPU(dst_cpu), sigp_store_adtl_status, RUN_ON_CPU_HOST_PTR(&si)); |
| break; |
| case SIGP_SET_PREFIX: |
| run_on_cpu(CPU(dst_cpu), sigp_set_prefix, RUN_ON_CPU_HOST_PTR(&si)); |
| break; |
| case SIGP_INITIAL_CPU_RESET: |
| run_on_cpu(CPU(dst_cpu), sigp_initial_cpu_reset, RUN_ON_CPU_HOST_PTR(&si)); |
| break; |
| case SIGP_CPU_RESET: |
| run_on_cpu(CPU(dst_cpu), sigp_cpu_reset, RUN_ON_CPU_HOST_PTR(&si)); |
| break; |
| case SIGP_COND_EMERGENCY: |
| sigp_cond_emergency(cpu, dst_cpu, &si); |
| break; |
| case SIGP_SENSE_RUNNING: |
| sigp_sense_running(dst_cpu, &si); |
| break; |
| default: |
| set_sigp_status(&si, SIGP_STAT_INVALID_ORDER); |
| } |
| |
| return si.cc; |
| } |
| |
| static int sigp_set_architecture(S390CPU *cpu, uint32_t param, |
| uint64_t *status_reg) |
| { |
| CPUState *cur_cs; |
| S390CPU *cur_cpu; |
| bool all_stopped = true; |
| |
| CPU_FOREACH(cur_cs) { |
| cur_cpu = S390_CPU(cur_cs); |
| |
| if (cur_cpu == cpu) { |
| continue; |
| } |
| if (s390_cpu_get_state(cur_cpu) != S390_CPU_STATE_STOPPED) { |
| all_stopped = false; |
| } |
| } |
| |
| *status_reg &= 0xffffffff00000000ULL; |
| |
| /* Reject set arch order, with czam we're always in z/Arch mode. */ |
| *status_reg |= (all_stopped ? SIGP_STAT_INVALID_PARAMETER : |
| SIGP_STAT_INCORRECT_STATE); |
| return SIGP_CC_STATUS_STORED; |
| } |
| |
| int handle_sigp(CPUS390XState *env, uint8_t order, uint64_t r1, uint64_t r3) |
| { |
| uint64_t *status_reg = &env->regs[r1]; |
| uint64_t param = (r1 % 2) ? env->regs[r1] : env->regs[r1 + 1]; |
| S390CPU *cpu = s390_env_get_cpu(env); |
| S390CPU *dst_cpu = NULL; |
| int ret; |
| |
| if (qemu_mutex_trylock(&qemu_sigp_mutex)) { |
| ret = SIGP_CC_BUSY; |
| goto out; |
| } |
| |
| switch (order) { |
| case SIGP_SET_ARCH: |
| ret = sigp_set_architecture(cpu, param, status_reg); |
| break; |
| default: |
| /* all other sigp orders target a single vcpu */ |
| dst_cpu = s390_cpu_addr2state(env->regs[r3]); |
| ret = handle_sigp_single_dst(cpu, dst_cpu, order, param, status_reg); |
| } |
| qemu_mutex_unlock(&qemu_sigp_mutex); |
| |
| out: |
| trace_sigp_finished(order, CPU(cpu)->cpu_index, |
| dst_cpu ? CPU(dst_cpu)->cpu_index : -1, ret); |
| g_assert(ret >= 0); |
| |
| return ret; |
| } |
| |
| int s390_cpu_restart(S390CPU *cpu) |
| { |
| SigpInfo si = {}; |
| |
| run_on_cpu(CPU(cpu), sigp_restart, RUN_ON_CPU_HOST_PTR(&si)); |
| return 0; |
| } |
| |
| void do_stop_interrupt(CPUS390XState *env) |
| { |
| S390CPU *cpu = s390_env_get_cpu(env); |
| |
| if (s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu) == 0) { |
| qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); |
| } |
| if (cpu->env.sigp_order == SIGP_STOP_STORE_STATUS) { |
| s390_store_status(cpu, S390_STORE_STATUS_DEF_ADDR, true); |
| } |
| env->sigp_order = 0; |
| env->pending_int &= ~INTERRUPT_STOP; |
| } |
| |
| void s390_init_sigp(void) |
| { |
| qemu_mutex_init(&qemu_sigp_mutex); |
| } |
