18f2abe6aSChristian Borntraeger /* 2a53c8fabSHeiko Carstens * in-kernel handling for sie intercepts 38f2abe6aSChristian Borntraeger * 4628eb9b8SChristian Ehrhardt * Copyright IBM Corp. 2008, 2009 58f2abe6aSChristian Borntraeger * 68f2abe6aSChristian Borntraeger * This program is free software; you can redistribute it and/or modify 78f2abe6aSChristian Borntraeger * it under the terms of the GNU General Public License (version 2 only) 88f2abe6aSChristian Borntraeger * as published by the Free Software Foundation. 98f2abe6aSChristian Borntraeger * 108f2abe6aSChristian Borntraeger * Author(s): Carsten Otte <cotte@de.ibm.com> 118f2abe6aSChristian Borntraeger * Christian Borntraeger <borntraeger@de.ibm.com> 128f2abe6aSChristian Borntraeger */ 138f2abe6aSChristian Borntraeger 148f2abe6aSChristian Borntraeger #include <linux/kvm_host.h> 158f2abe6aSChristian Borntraeger #include <linux/errno.h> 168f2abe6aSChristian Borntraeger #include <linux/pagemap.h> 178f2abe6aSChristian Borntraeger 188f2abe6aSChristian Borntraeger #include <asm/kvm_host.h> 198f2abe6aSChristian Borntraeger 208f2abe6aSChristian Borntraeger #include "kvm-s390.h" 21ba5c1e9bSCarsten Otte #include "gaccess.h" 225786fffaSCornelia Huck #include "trace.h" 23ade38c31SCornelia Huck #include "trace-s390.h" 24ba5c1e9bSCarsten Otte 25f379aae5SCornelia Huck 2677975357SCornelia Huck static const intercept_handler_t instruction_handlers[256] = { 278c3f61e2SCornelia Huck [0x01] = kvm_s390_handle_01, 2848a3e950SCornelia Huck [0x82] = kvm_s390_handle_lpsw, 29e28acfeaSChristian Borntraeger [0x83] = kvm_s390_handle_diag, 305288fbf0SChristian Borntraeger [0xae] = kvm_s390_handle_sigp, 3170455a36SChristian Borntraeger [0xb2] = kvm_s390_handle_b2, 32953ed88dSThomas Huth [0xb7] = kvm_s390_handle_lctl, 3348a3e950SCornelia Huck [0xb9] = kvm_s390_handle_b9, 34bb25b9baSChristian Borntraeger [0xe5] = kvm_s390_handle_e5, 35953ed88dSThomas Huth [0xeb] = kvm_s390_handle_eb, 36ba5c1e9bSCarsten Otte }; 378f2abe6aSChristian Borntraeger 388f2abe6aSChristian Borntraeger static int handle_noop(struct kvm_vcpu *vcpu) 398f2abe6aSChristian Borntraeger { 408f2abe6aSChristian Borntraeger switch (vcpu->arch.sie_block->icptcode) { 410eaeafa1SChristian Borntraeger case 0x0: 420eaeafa1SChristian Borntraeger vcpu->stat.exit_null++; 430eaeafa1SChristian Borntraeger break; 448f2abe6aSChristian Borntraeger case 0x10: 458f2abe6aSChristian Borntraeger vcpu->stat.exit_external_request++; 468f2abe6aSChristian Borntraeger break; 478f2abe6aSChristian Borntraeger case 0x14: 488f2abe6aSChristian Borntraeger vcpu->stat.exit_external_interrupt++; 498f2abe6aSChristian Borntraeger break; 508f2abe6aSChristian Borntraeger default: 518f2abe6aSChristian Borntraeger break; /* nothing */ 528f2abe6aSChristian Borntraeger } 538f2abe6aSChristian Borntraeger return 0; 548f2abe6aSChristian Borntraeger } 558f2abe6aSChristian Borntraeger 568f2abe6aSChristian Borntraeger static int handle_stop(struct kvm_vcpu *vcpu) 578f2abe6aSChristian Borntraeger { 589ace903dSChristian Ehrhardt int rc = 0; 595288fbf0SChristian Borntraeger 608f2abe6aSChristian Borntraeger vcpu->stat.exit_stop_request++; 615288fbf0SChristian Borntraeger spin_lock_bh(&vcpu->arch.local_int.lock); 625288fbf0SChristian Borntraeger 63ade38c31SCornelia Huck trace_kvm_s390_stop_request(vcpu->arch.local_int.action_bits); 64ade38c31SCornelia Huck 655288fbf0SChristian Borntraeger if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) { 669e6dabefSCornelia Huck atomic_set_mask(CPUSTAT_STOPPED, 679e6dabefSCornelia Huck &vcpu->arch.sie_block->cpuflags); 685288fbf0SChristian Borntraeger vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP; 695288fbf0SChristian Borntraeger VCPU_EVENT(vcpu, 3, "%s", "cpu stopped"); 70b8e660b8SHeiko Carstens rc = -EOPNOTSUPP; 719ace903dSChristian Ehrhardt } 729ace903dSChristian Ehrhardt 739e0d5473SJens Freimann if (vcpu->arch.local_int.action_bits & ACTION_STORE_ON_STOP) { 749e0d5473SJens Freimann vcpu->arch.local_int.action_bits &= ~ACTION_STORE_ON_STOP; 759e0d5473SJens Freimann /* store status must be called unlocked. Since local_int.lock 769e0d5473SJens Freimann * only protects local_int.* and not guest memory we can give 779e0d5473SJens Freimann * up the lock here */ 789e0d5473SJens Freimann spin_unlock_bh(&vcpu->arch.local_int.lock); 799e0d5473SJens Freimann rc = kvm_s390_vcpu_store_status(vcpu, 809e0d5473SJens Freimann KVM_S390_STORE_STATUS_NOADDR); 819e0d5473SJens Freimann if (rc >= 0) 829e0d5473SJens Freimann rc = -EOPNOTSUPP; 839e0d5473SJens Freimann } else 845288fbf0SChristian Borntraeger spin_unlock_bh(&vcpu->arch.local_int.lock); 855288fbf0SChristian Borntraeger return rc; 868f2abe6aSChristian Borntraeger } 878f2abe6aSChristian Borntraeger 888f2abe6aSChristian Borntraeger static int handle_validity(struct kvm_vcpu *vcpu) 898f2abe6aSChristian Borntraeger { 908f2abe6aSChristian Borntraeger int viwhy = vcpu->arch.sie_block->ipb >> 16; 913edbcff9SCarsten Otte 928f2abe6aSChristian Borntraeger vcpu->stat.exit_validity++; 935786fffaSCornelia Huck trace_kvm_s390_intercept_validity(vcpu, viwhy); 942c70fe44SChristian Borntraeger WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy); 952c70fe44SChristian Borntraeger return -EOPNOTSUPP; 968f2abe6aSChristian Borntraeger } 978f2abe6aSChristian Borntraeger 98ba5c1e9bSCarsten Otte static int handle_instruction(struct kvm_vcpu *vcpu) 99ba5c1e9bSCarsten Otte { 100ba5c1e9bSCarsten Otte intercept_handler_t handler; 101ba5c1e9bSCarsten Otte 102ba5c1e9bSCarsten Otte vcpu->stat.exit_instruction++; 1035786fffaSCornelia Huck trace_kvm_s390_intercept_instruction(vcpu, 1045786fffaSCornelia Huck vcpu->arch.sie_block->ipa, 1055786fffaSCornelia Huck vcpu->arch.sie_block->ipb); 106ba5c1e9bSCarsten Otte handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8]; 107ba5c1e9bSCarsten Otte if (handler) 108ba5c1e9bSCarsten Otte return handler(vcpu); 109b8e660b8SHeiko Carstens return -EOPNOTSUPP; 110ba5c1e9bSCarsten Otte } 111ba5c1e9bSCarsten Otte 112ba5c1e9bSCarsten Otte static int handle_prog(struct kvm_vcpu *vcpu) 113ba5c1e9bSCarsten Otte { 114*0040e7d2SHeiko Carstens struct kvm_s390_itdb *itdb; 115*0040e7d2SHeiko Carstens int rc; 116*0040e7d2SHeiko Carstens 117ba5c1e9bSCarsten Otte vcpu->stat.exit_program_interruption++; 1187feb6bb8SMichael Mueller 1197feb6bb8SMichael Mueller /* Restore ITDB to Program-Interruption TDB in guest memory */ 120*0040e7d2SHeiko Carstens if (!IS_TE_ENABLED(vcpu) || !IS_ITDB_VALID(vcpu)) 121*0040e7d2SHeiko Carstens goto skip_itdb; 122*0040e7d2SHeiko Carstens if (current->thread.per_flags & PER_FLAG_NO_TE) 123*0040e7d2SHeiko Carstens goto skip_itdb; 124*0040e7d2SHeiko Carstens itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba; 125*0040e7d2SHeiko Carstens rc = write_guest_lc(vcpu, TDB_ADDR, itdb, sizeof(*itdb)); 126*0040e7d2SHeiko Carstens if (rc) 127*0040e7d2SHeiko Carstens return rc; 128*0040e7d2SHeiko Carstens memset(itdb, 0, sizeof(*itdb)); 129*0040e7d2SHeiko Carstens skip_itdb: 1305786fffaSCornelia Huck trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc); 131ba5c1e9bSCarsten Otte return kvm_s390_inject_program_int(vcpu, vcpu->arch.sie_block->iprcc); 132ba5c1e9bSCarsten Otte } 133ba5c1e9bSCarsten Otte 134ba5c1e9bSCarsten Otte static int handle_instruction_and_prog(struct kvm_vcpu *vcpu) 135ba5c1e9bSCarsten Otte { 136ba5c1e9bSCarsten Otte int rc, rc2; 137ba5c1e9bSCarsten Otte 138ba5c1e9bSCarsten Otte vcpu->stat.exit_instr_and_program++; 139ba5c1e9bSCarsten Otte rc = handle_instruction(vcpu); 140ba5c1e9bSCarsten Otte rc2 = handle_prog(vcpu); 141ba5c1e9bSCarsten Otte 142b8e660b8SHeiko Carstens if (rc == -EOPNOTSUPP) 143ba5c1e9bSCarsten Otte vcpu->arch.sie_block->icptcode = 0x04; 144ba5c1e9bSCarsten Otte if (rc) 145ba5c1e9bSCarsten Otte return rc; 146ba5c1e9bSCarsten Otte return rc2; 147ba5c1e9bSCarsten Otte } 148ba5c1e9bSCarsten Otte 149062d5e9bSChristian Borntraeger static const intercept_handler_t intercept_funcs[] = { 1508f2abe6aSChristian Borntraeger [0x00 >> 2] = handle_noop, 151ba5c1e9bSCarsten Otte [0x04 >> 2] = handle_instruction, 152ba5c1e9bSCarsten Otte [0x08 >> 2] = handle_prog, 153ba5c1e9bSCarsten Otte [0x0C >> 2] = handle_instruction_and_prog, 1548f2abe6aSChristian Borntraeger [0x10 >> 2] = handle_noop, 1558f2abe6aSChristian Borntraeger [0x14 >> 2] = handle_noop, 156fa6b7fe9SCornelia Huck [0x18 >> 2] = handle_noop, 157ba5c1e9bSCarsten Otte [0x1C >> 2] = kvm_s390_handle_wait, 1588f2abe6aSChristian Borntraeger [0x20 >> 2] = handle_validity, 1598f2abe6aSChristian Borntraeger [0x28 >> 2] = handle_stop, 1608f2abe6aSChristian Borntraeger }; 1618f2abe6aSChristian Borntraeger 1628f2abe6aSChristian Borntraeger int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu) 1638f2abe6aSChristian Borntraeger { 1648f2abe6aSChristian Borntraeger intercept_handler_t func; 1658f2abe6aSChristian Borntraeger u8 code = vcpu->arch.sie_block->icptcode; 1668f2abe6aSChristian Borntraeger 167062d5e9bSChristian Borntraeger if (code & 3 || (code >> 2) >= ARRAY_SIZE(intercept_funcs)) 168b8e660b8SHeiko Carstens return -EOPNOTSUPP; 1698f2abe6aSChristian Borntraeger func = intercept_funcs[code >> 2]; 1708f2abe6aSChristian Borntraeger if (func) 1718f2abe6aSChristian Borntraeger return func(vcpu); 172b8e660b8SHeiko Carstens return -EOPNOTSUPP; 1738f2abe6aSChristian Borntraeger } 174