1 /* 2 * in-kernel handling for sie intercepts 3 * 4 * Copyright IBM Corp. 2008, 2009 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 * Christian Borntraeger <borntraeger@de.ibm.com> 12 */ 13 14 #include <linux/kvm_host.h> 15 #include <linux/errno.h> 16 #include <linux/pagemap.h> 17 18 #include <asm/kvm_host.h> 19 20 #include "kvm-s390.h" 21 #include "gaccess.h" 22 #include "trace.h" 23 #include "trace-s390.h" 24 25 26 static const intercept_handler_t instruction_handlers[256] = { 27 [0x01] = kvm_s390_handle_01, 28 [0x82] = kvm_s390_handle_lpsw, 29 [0x83] = kvm_s390_handle_diag, 30 [0xae] = kvm_s390_handle_sigp, 31 [0xb2] = kvm_s390_handle_b2, 32 [0xb7] = kvm_s390_handle_lctl, 33 [0xb9] = kvm_s390_handle_b9, 34 [0xe5] = kvm_s390_handle_e5, 35 [0xeb] = kvm_s390_handle_eb, 36 }; 37 38 static int handle_noop(struct kvm_vcpu *vcpu) 39 { 40 switch (vcpu->arch.sie_block->icptcode) { 41 case 0x0: 42 vcpu->stat.exit_null++; 43 break; 44 case 0x10: 45 vcpu->stat.exit_external_request++; 46 break; 47 case 0x14: 48 vcpu->stat.exit_external_interrupt++; 49 break; 50 default: 51 break; /* nothing */ 52 } 53 return 0; 54 } 55 56 static int handle_stop(struct kvm_vcpu *vcpu) 57 { 58 int rc = 0; 59 60 vcpu->stat.exit_stop_request++; 61 spin_lock_bh(&vcpu->arch.local_int.lock); 62 63 trace_kvm_s390_stop_request(vcpu->arch.local_int.action_bits); 64 65 if (vcpu->arch.local_int.action_bits & ACTION_RELOADVCPU_ON_STOP) { 66 vcpu->arch.local_int.action_bits &= ~ACTION_RELOADVCPU_ON_STOP; 67 rc = SIE_INTERCEPT_RERUNVCPU; 68 vcpu->run->exit_reason = KVM_EXIT_INTR; 69 } 70 71 if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) { 72 atomic_set_mask(CPUSTAT_STOPPED, 73 &vcpu->arch.sie_block->cpuflags); 74 vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP; 75 VCPU_EVENT(vcpu, 3, "%s", "cpu stopped"); 76 rc = -EOPNOTSUPP; 77 } 78 79 if (vcpu->arch.local_int.action_bits & ACTION_STORE_ON_STOP) { 80 vcpu->arch.local_int.action_bits &= ~ACTION_STORE_ON_STOP; 81 /* store status must be called unlocked. Since local_int.lock 82 * only protects local_int.* and not guest memory we can give 83 * up the lock here */ 84 spin_unlock_bh(&vcpu->arch.local_int.lock); 85 rc = kvm_s390_vcpu_store_status(vcpu, 86 KVM_S390_STORE_STATUS_NOADDR); 87 if (rc >= 0) 88 rc = -EOPNOTSUPP; 89 } else 90 spin_unlock_bh(&vcpu->arch.local_int.lock); 91 return rc; 92 } 93 94 static int handle_validity(struct kvm_vcpu *vcpu) 95 { 96 int viwhy = vcpu->arch.sie_block->ipb >> 16; 97 98 vcpu->stat.exit_validity++; 99 trace_kvm_s390_intercept_validity(vcpu, viwhy); 100 WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy); 101 return -EOPNOTSUPP; 102 } 103 104 static int handle_instruction(struct kvm_vcpu *vcpu) 105 { 106 intercept_handler_t handler; 107 108 vcpu->stat.exit_instruction++; 109 trace_kvm_s390_intercept_instruction(vcpu, 110 vcpu->arch.sie_block->ipa, 111 vcpu->arch.sie_block->ipb); 112 handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8]; 113 if (handler) 114 return handler(vcpu); 115 return -EOPNOTSUPP; 116 } 117 118 static int handle_prog(struct kvm_vcpu *vcpu) 119 { 120 vcpu->stat.exit_program_interruption++; 121 trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc); 122 return kvm_s390_inject_program_int(vcpu, vcpu->arch.sie_block->iprcc); 123 } 124 125 static int handle_instruction_and_prog(struct kvm_vcpu *vcpu) 126 { 127 int rc, rc2; 128 129 vcpu->stat.exit_instr_and_program++; 130 rc = handle_instruction(vcpu); 131 rc2 = handle_prog(vcpu); 132 133 if (rc == -EOPNOTSUPP) 134 vcpu->arch.sie_block->icptcode = 0x04; 135 if (rc) 136 return rc; 137 return rc2; 138 } 139 140 static const intercept_handler_t intercept_funcs[] = { 141 [0x00 >> 2] = handle_noop, 142 [0x04 >> 2] = handle_instruction, 143 [0x08 >> 2] = handle_prog, 144 [0x0C >> 2] = handle_instruction_and_prog, 145 [0x10 >> 2] = handle_noop, 146 [0x14 >> 2] = handle_noop, 147 [0x18 >> 2] = handle_noop, 148 [0x1C >> 2] = kvm_s390_handle_wait, 149 [0x20 >> 2] = handle_validity, 150 [0x28 >> 2] = handle_stop, 151 }; 152 153 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu) 154 { 155 intercept_handler_t func; 156 u8 code = vcpu->arch.sie_block->icptcode; 157 158 if (code & 3 || (code >> 2) >= ARRAY_SIZE(intercept_funcs)) 159 return -EOPNOTSUPP; 160 func = intercept_funcs[code >> 2]; 161 if (func) 162 return func(vcpu); 163 return -EOPNOTSUPP; 164 } 165