| /* |
| * handling interprocessor communication |
| * |
| * Copyright IBM Corp. 2008, 2013 |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License (version 2 only) |
| * as published by the Free Software Foundation. |
| * |
| * Author(s): Carsten Otte <cotte@de.ibm.com> |
| * Christian Borntraeger <borntraeger@de.ibm.com> |
| * Christian Ehrhardt <ehrhardt@de.ibm.com> |
| */ |
| |
| #include <linux/kvm.h> |
| #include <linux/kvm_host.h> |
| #include <linux/slab.h> |
| #include <asm/sigp.h> |
| #include "gaccess.h" |
| #include "kvm-s390.h" |
| #include "trace.h" |
| |
| static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr, |
| u64 *reg) |
| { |
| struct kvm_s390_local_interrupt *li; |
| struct kvm_vcpu *dst_vcpu = NULL; |
| int cpuflags; |
| int rc; |
| |
| if (cpu_addr >= KVM_MAX_VCPUS) |
| return SIGP_CC_NOT_OPERATIONAL; |
| |
| dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr); |
| if (!dst_vcpu) |
| return SIGP_CC_NOT_OPERATIONAL; |
| li = &dst_vcpu->arch.local_int; |
| |
| cpuflags = atomic_read(li->cpuflags); |
| if (!(cpuflags & (CPUSTAT_ECALL_PEND | CPUSTAT_STOPPED))) |
| rc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| else { |
| *reg &= 0xffffffff00000000UL; |
| if (cpuflags & CPUSTAT_ECALL_PEND) |
| *reg |= SIGP_STATUS_EXT_CALL_PENDING; |
| if (cpuflags & CPUSTAT_STOPPED) |
| *reg |= SIGP_STATUS_STOPPED; |
| rc = SIGP_CC_STATUS_STORED; |
| } |
| |
| VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc); |
| return rc; |
| } |
| |
| static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr) |
| { |
| struct kvm_s390_interrupt s390int = { |
| .type = KVM_S390_INT_EMERGENCY, |
| .parm = vcpu->vcpu_id, |
| }; |
| struct kvm_vcpu *dst_vcpu = NULL; |
| int rc = 0; |
| |
| if (cpu_addr < KVM_MAX_VCPUS) |
| dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr); |
| if (!dst_vcpu) |
| return SIGP_CC_NOT_OPERATIONAL; |
| |
| rc = kvm_s390_inject_vcpu(dst_vcpu, &s390int); |
| if (!rc) |
| VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr); |
| |
| return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED; |
| } |
| |
| static int __sigp_conditional_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr, |
| u16 asn, u64 *reg) |
| { |
| struct kvm_vcpu *dst_vcpu = NULL; |
| const u64 psw_int_mask = PSW_MASK_IO | PSW_MASK_EXT; |
| u16 p_asn, s_asn; |
| psw_t *psw; |
| u32 flags; |
| |
| if (cpu_addr < KVM_MAX_VCPUS) |
| dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr); |
| if (!dst_vcpu) |
| return SIGP_CC_NOT_OPERATIONAL; |
| flags = atomic_read(&dst_vcpu->arch.sie_block->cpuflags); |
| psw = &dst_vcpu->arch.sie_block->gpsw; |
| p_asn = dst_vcpu->arch.sie_block->gcr[4] & 0xffff; /* Primary ASN */ |
| s_asn = dst_vcpu->arch.sie_block->gcr[3] & 0xffff; /* Secondary ASN */ |
| |
| /* Deliver the emergency signal? */ |
| if (!(flags & CPUSTAT_STOPPED) |
| || (psw->mask & psw_int_mask) != psw_int_mask |
| || ((flags & CPUSTAT_WAIT) && psw->addr != 0) |
| || (!(flags & CPUSTAT_WAIT) && (asn == p_asn || asn == s_asn))) { |
| return __sigp_emergency(vcpu, cpu_addr); |
| } else { |
| *reg &= 0xffffffff00000000UL; |
| *reg |= SIGP_STATUS_INCORRECT_STATE; |
| return SIGP_CC_STATUS_STORED; |
| } |
| } |
| |
| static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr) |
| { |
| struct kvm_s390_interrupt s390int = { |
| .type = KVM_S390_INT_EXTERNAL_CALL, |
| .parm = vcpu->vcpu_id, |
| }; |
| struct kvm_vcpu *dst_vcpu = NULL; |
| int rc; |
| |
| if (cpu_addr < KVM_MAX_VCPUS) |
| dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr); |
| if (!dst_vcpu) |
| return SIGP_CC_NOT_OPERATIONAL; |
| |
| rc = kvm_s390_inject_vcpu(dst_vcpu, &s390int); |
| if (!rc) |
| VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x", cpu_addr); |
| |
| return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED; |
| } |
| |
| static int __inject_sigp_stop(struct kvm_vcpu *dst_vcpu, int action) |
| { |
| struct kvm_s390_local_interrupt *li = &dst_vcpu->arch.local_int; |
| struct kvm_s390_interrupt_info *inti; |
| int rc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| |
| inti = kzalloc(sizeof(*inti), GFP_ATOMIC); |
| if (!inti) |
| return -ENOMEM; |
| inti->type = KVM_S390_SIGP_STOP; |
| |
| spin_lock(&li->lock); |
| if (li->action_bits & ACTION_STOP_ON_STOP) { |
| /* another SIGP STOP is pending */ |
| kfree(inti); |
| rc = SIGP_CC_BUSY; |
| goto out; |
| } |
| if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) { |
| kfree(inti); |
| if ((action & ACTION_STORE_ON_STOP) != 0) |
| rc = -ESHUTDOWN; |
| goto out; |
| } |
| list_add_tail(&inti->list, &li->list); |
| atomic_set(&li->active, 1); |
| li->action_bits |= action; |
| atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags); |
| kvm_s390_vcpu_wakeup(dst_vcpu); |
| out: |
| spin_unlock(&li->lock); |
| |
| return rc; |
| } |
| |
| static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action) |
| { |
| struct kvm_vcpu *dst_vcpu = NULL; |
| int rc; |
| |
| if (cpu_addr >= KVM_MAX_VCPUS) |
| return SIGP_CC_NOT_OPERATIONAL; |
| |
| dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr); |
| if (!dst_vcpu) |
| return SIGP_CC_NOT_OPERATIONAL; |
| |
| rc = __inject_sigp_stop(dst_vcpu, action); |
| |
| VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr); |
| |
| if ((action & ACTION_STORE_ON_STOP) != 0 && rc == -ESHUTDOWN) { |
| /* If the CPU has already been stopped, we still have |
| * to save the status when doing stop-and-store. This |
| * has to be done after unlocking all spinlocks. */ |
| rc = kvm_s390_store_status_unloaded(dst_vcpu, |
| KVM_S390_STORE_STATUS_NOADDR); |
| } |
| |
| return rc; |
| } |
| |
| static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter) |
| { |
| int rc; |
| unsigned int i; |
| struct kvm_vcpu *v; |
| |
| switch (parameter & 0xff) { |
| case 0: |
| rc = SIGP_CC_NOT_OPERATIONAL; |
| break; |
| case 1: |
| case 2: |
| kvm_for_each_vcpu(i, v, vcpu->kvm) { |
| v->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; |
| kvm_clear_async_pf_completion_queue(v); |
| } |
| |
| rc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| break; |
| default: |
| rc = -EOPNOTSUPP; |
| } |
| return rc; |
| } |
| |
| static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address, |
| u64 *reg) |
| { |
| struct kvm_s390_local_interrupt *li; |
| struct kvm_vcpu *dst_vcpu = NULL; |
| struct kvm_s390_interrupt_info *inti; |
| int rc; |
| |
| if (cpu_addr < KVM_MAX_VCPUS) |
| dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr); |
| if (!dst_vcpu) |
| return SIGP_CC_NOT_OPERATIONAL; |
| li = &dst_vcpu->arch.local_int; |
| |
| /* |
| * Make sure the new value is valid memory. We only need to check the |
| * first page, since address is 8k aligned and memory pieces are always |
| * at least 1MB aligned and have at least a size of 1MB. |
| */ |
| address &= 0x7fffe000u; |
| if (kvm_is_error_gpa(vcpu->kvm, address)) { |
| *reg &= 0xffffffff00000000UL; |
| *reg |= SIGP_STATUS_INVALID_PARAMETER; |
| return SIGP_CC_STATUS_STORED; |
| } |
| |
| inti = kzalloc(sizeof(*inti), GFP_KERNEL); |
| if (!inti) |
| return SIGP_CC_BUSY; |
| |
| spin_lock(&li->lock); |
| /* cpu must be in stopped state */ |
| if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) { |
| *reg &= 0xffffffff00000000UL; |
| *reg |= SIGP_STATUS_INCORRECT_STATE; |
| rc = SIGP_CC_STATUS_STORED; |
| kfree(inti); |
| goto out_li; |
| } |
| |
| inti->type = KVM_S390_SIGP_SET_PREFIX; |
| inti->prefix.address = address; |
| |
| list_add_tail(&inti->list, &li->list); |
| atomic_set(&li->active, 1); |
| kvm_s390_vcpu_wakeup(dst_vcpu); |
| rc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| |
| VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address); |
| out_li: |
| spin_unlock(&li->lock); |
| return rc; |
| } |
| |
| static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu, u16 cpu_id, |
| u32 addr, u64 *reg) |
| { |
| struct kvm_vcpu *dst_vcpu = NULL; |
| int flags; |
| int rc; |
| |
| if (cpu_id < KVM_MAX_VCPUS) |
| dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_id); |
| if (!dst_vcpu) |
| return SIGP_CC_NOT_OPERATIONAL; |
| |
| spin_lock(&dst_vcpu->arch.local_int.lock); |
| flags = atomic_read(dst_vcpu->arch.local_int.cpuflags); |
| spin_unlock(&dst_vcpu->arch.local_int.lock); |
| if (!(flags & CPUSTAT_STOPPED)) { |
| *reg &= 0xffffffff00000000UL; |
| *reg |= SIGP_STATUS_INCORRECT_STATE; |
| return SIGP_CC_STATUS_STORED; |
| } |
| |
| addr &= 0x7ffffe00; |
| rc = kvm_s390_store_status_unloaded(dst_vcpu, addr); |
| if (rc == -EFAULT) { |
| *reg &= 0xffffffff00000000UL; |
| *reg |= SIGP_STATUS_INVALID_PARAMETER; |
| rc = SIGP_CC_STATUS_STORED; |
| } |
| return rc; |
| } |
| |
| static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr, |
| u64 *reg) |
| { |
| struct kvm_s390_local_interrupt *li; |
| struct kvm_vcpu *dst_vcpu = NULL; |
| int rc; |
| |
| if (cpu_addr >= KVM_MAX_VCPUS) |
| return SIGP_CC_NOT_OPERATIONAL; |
| |
| dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr); |
| if (!dst_vcpu) |
| return SIGP_CC_NOT_OPERATIONAL; |
| li = &dst_vcpu->arch.local_int; |
| if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) { |
| /* running */ |
| rc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| } else { |
| /* not running */ |
| *reg &= 0xffffffff00000000UL; |
| *reg |= SIGP_STATUS_NOT_RUNNING; |
| rc = SIGP_CC_STATUS_STORED; |
| } |
| |
| VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x", cpu_addr, |
| rc); |
| |
| return rc; |
| } |
| |
| /* Test whether the destination CPU is available and not busy */ |
| static int sigp_check_callable(struct kvm_vcpu *vcpu, u16 cpu_addr) |
| { |
| struct kvm_s390_local_interrupt *li; |
| int rc = SIGP_CC_ORDER_CODE_ACCEPTED; |
| struct kvm_vcpu *dst_vcpu = NULL; |
| |
| if (cpu_addr >= KVM_MAX_VCPUS) |
| return SIGP_CC_NOT_OPERATIONAL; |
| |
| dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr); |
| if (!dst_vcpu) |
| return SIGP_CC_NOT_OPERATIONAL; |
| li = &dst_vcpu->arch.local_int; |
| spin_lock(&li->lock); |
| if (li->action_bits & ACTION_STOP_ON_STOP) |
| rc = SIGP_CC_BUSY; |
| spin_unlock(&li->lock); |
| |
| return rc; |
| } |
| |
| int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu) |
| { |
| int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; |
| int r3 = vcpu->arch.sie_block->ipa & 0x000f; |
| u32 parameter; |
| u16 cpu_addr = vcpu->run->s.regs.gprs[r3]; |
| u8 order_code; |
| int rc; |
| |
| /* sigp in userspace can exit */ |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| order_code = kvm_s390_get_base_disp_rs(vcpu); |
| |
| if (r1 % 2) |
| parameter = vcpu->run->s.regs.gprs[r1]; |
| else |
| parameter = vcpu->run->s.regs.gprs[r1 + 1]; |
| |
| trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter); |
| switch (order_code) { |
| case SIGP_SENSE: |
| vcpu->stat.instruction_sigp_sense++; |
| rc = __sigp_sense(vcpu, cpu_addr, |
| &vcpu->run->s.regs.gprs[r1]); |
| break; |
| case SIGP_EXTERNAL_CALL: |
| vcpu->stat.instruction_sigp_external_call++; |
| rc = __sigp_external_call(vcpu, cpu_addr); |
| break; |
| case SIGP_EMERGENCY_SIGNAL: |
| vcpu->stat.instruction_sigp_emergency++; |
| rc = __sigp_emergency(vcpu, cpu_addr); |
| break; |
| case SIGP_STOP: |
| vcpu->stat.instruction_sigp_stop++; |
| rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP); |
| break; |
| case SIGP_STOP_AND_STORE_STATUS: |
| vcpu->stat.instruction_sigp_stop++; |
| rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP | |
| ACTION_STOP_ON_STOP); |
| break; |
| case SIGP_STORE_STATUS_AT_ADDRESS: |
| rc = __sigp_store_status_at_addr(vcpu, cpu_addr, parameter, |
| &vcpu->run->s.regs.gprs[r1]); |
| break; |
| case SIGP_SET_ARCHITECTURE: |
| vcpu->stat.instruction_sigp_arch++; |
| rc = __sigp_set_arch(vcpu, parameter); |
| break; |
| case SIGP_SET_PREFIX: |
| vcpu->stat.instruction_sigp_prefix++; |
| rc = __sigp_set_prefix(vcpu, cpu_addr, parameter, |
| &vcpu->run->s.regs.gprs[r1]); |
| break; |
| case SIGP_COND_EMERGENCY_SIGNAL: |
| rc = __sigp_conditional_emergency(vcpu, cpu_addr, parameter, |
| &vcpu->run->s.regs.gprs[r1]); |
| break; |
| case SIGP_SENSE_RUNNING: |
| vcpu->stat.instruction_sigp_sense_running++; |
| rc = __sigp_sense_running(vcpu, cpu_addr, |
| &vcpu->run->s.regs.gprs[r1]); |
| break; |
| case SIGP_START: |
| rc = sigp_check_callable(vcpu, cpu_addr); |
| if (rc == SIGP_CC_ORDER_CODE_ACCEPTED) |
| rc = -EOPNOTSUPP; /* Handle START in user space */ |
| break; |
| case SIGP_RESTART: |
| vcpu->stat.instruction_sigp_restart++; |
| rc = sigp_check_callable(vcpu, cpu_addr); |
| if (rc == SIGP_CC_ORDER_CODE_ACCEPTED) { |
| VCPU_EVENT(vcpu, 4, |
| "sigp restart %x to handle userspace", |
| cpu_addr); |
| /* user space must know about restart */ |
| rc = -EOPNOTSUPP; |
| } |
| break; |
| default: |
| return -EOPNOTSUPP; |
| } |
| |
| if (rc < 0) |
| return rc; |
| |
| kvm_s390_set_psw_cc(vcpu, rc); |
| return 0; |
| } |
| |
| /* |
| * Handle SIGP partial execution interception. |
| * |
| * This interception will occur at the source cpu when a source cpu sends an |
| * external call to a target cpu and the target cpu has the WAIT bit set in |
| * its cpuflags. Interception will occurr after the interrupt indicator bits at |
| * the target cpu have been set. All error cases will lead to instruction |
| * interception, therefore nothing is to be checked or prepared. |
| */ |
| int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu) |
| { |
| int r3 = vcpu->arch.sie_block->ipa & 0x000f; |
| u16 cpu_addr = vcpu->run->s.regs.gprs[r3]; |
| struct kvm_vcpu *dest_vcpu; |
| u8 order_code = kvm_s390_get_base_disp_rs(vcpu); |
| |
| trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr); |
| |
| if (order_code == SIGP_EXTERNAL_CALL) { |
| dest_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr); |
| BUG_ON(dest_vcpu == NULL); |
| |
| kvm_s390_vcpu_wakeup(dest_vcpu); |
| kvm_s390_set_psw_cc(vcpu, SIGP_CC_ORDER_CODE_ACCEPTED); |
| return 0; |
| } |
| |
| return -EOPNOTSUPP; |
| } |