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_STOP_ON_STOP) { 66 atomic_set_mask(CPUSTAT_STOPPED, 67 &vcpu->arch.sie_block->cpuflags); 68 vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP; 69 VCPU_EVENT(vcpu, 3, "%s", "cpu stopped"); 70 rc = -EOPNOTSUPP; 71 } 72 73 if (vcpu->arch.local_int.action_bits & ACTION_STORE_ON_STOP) { 74 vcpu->arch.local_int.action_bits &= ~ACTION_STORE_ON_STOP; 75 /* store status must be called unlocked. Since local_int.lock 76 * only protects local_int.* and not guest memory we can give 77 * up the lock here */ 78 spin_unlock_bh(&vcpu->arch.local_int.lock); 79 rc = kvm_s390_vcpu_store_status(vcpu, 80 KVM_S390_STORE_STATUS_NOADDR); 81 if (rc >= 0) 82 rc = -EOPNOTSUPP; 83 } else 84 spin_unlock_bh(&vcpu->arch.local_int.lock); 85 return rc; 86 } 87 88 static int handle_validity(struct kvm_vcpu *vcpu) 89 { 90 int viwhy = vcpu->arch.sie_block->ipb >> 16; 91 92 vcpu->stat.exit_validity++; 93 trace_kvm_s390_intercept_validity(vcpu, viwhy); 94 WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy); 95 return -EOPNOTSUPP; 96 } 97 98 static int handle_instruction(struct kvm_vcpu *vcpu) 99 { 100 intercept_handler_t handler; 101 102 vcpu->stat.exit_instruction++; 103 trace_kvm_s390_intercept_instruction(vcpu, 104 vcpu->arch.sie_block->ipa, 105 vcpu->arch.sie_block->ipb); 106 handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8]; 107 if (handler) 108 return handler(vcpu); 109 return -EOPNOTSUPP; 110 } 111 112 static int handle_prog(struct kvm_vcpu *vcpu) 113 { 114 vcpu->stat.exit_program_interruption++; 115 116 /* Restore ITDB to Program-Interruption TDB in guest memory */ 117 if (IS_TE_ENABLED(vcpu) && 118 !(current->thread.per_flags & PER_FLAG_NO_TE) && 119 IS_ITDB_VALID(vcpu)) { 120 copy_to_guest(vcpu, TDB_ADDR, vcpu->arch.sie_block->itdba, 121 sizeof(struct kvm_s390_itdb)); 122 memset((void *) vcpu->arch.sie_block->itdba, 0, 123 sizeof(struct kvm_s390_itdb)); 124 } 125 126 trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc); 127 return kvm_s390_inject_program_int(vcpu, vcpu->arch.sie_block->iprcc); 128 } 129 130 static int handle_instruction_and_prog(struct kvm_vcpu *vcpu) 131 { 132 int rc, rc2; 133 134 vcpu->stat.exit_instr_and_program++; 135 rc = handle_instruction(vcpu); 136 rc2 = handle_prog(vcpu); 137 138 if (rc == -EOPNOTSUPP) 139 vcpu->arch.sie_block->icptcode = 0x04; 140 if (rc) 141 return rc; 142 return rc2; 143 } 144 145 static const intercept_handler_t intercept_funcs[] = { 146 [0x00 >> 2] = handle_noop, 147 [0x04 >> 2] = handle_instruction, 148 [0x08 >> 2] = handle_prog, 149 [0x0C >> 2] = handle_instruction_and_prog, 150 [0x10 >> 2] = handle_noop, 151 [0x14 >> 2] = handle_noop, 152 [0x18 >> 2] = handle_noop, 153 [0x1C >> 2] = kvm_s390_handle_wait, 154 [0x20 >> 2] = handle_validity, 155 [0x28 >> 2] = handle_stop, 156 }; 157 158 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu) 159 { 160 intercept_handler_t func; 161 u8 code = vcpu->arch.sie_block->icptcode; 162 163 if (code & 3 || (code >> 2) >= ARRAY_SIZE(intercept_funcs)) 164 return -EOPNOTSUPP; 165 func = intercept_funcs[code >> 2]; 166 if (func) 167 return func(vcpu); 168 return -EOPNOTSUPP; 169 } 170