| /* |
| * in-kernel handling for sie intercepts |
| * |
| * Copyright IBM Corp. 2008, 2014 |
| * |
| * 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> |
| */ |
| |
| #include <linux/kvm_host.h> |
| #include <linux/errno.h> |
| #include <linux/pagemap.h> |
| |
| #include <asm/kvm_host.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/irq.h> |
| |
| #include "kvm-s390.h" |
| #include "gaccess.h" |
| #include "trace.h" |
| #include "trace-s390.h" |
| |
| |
| static const intercept_handler_t instruction_handlers[256] = { |
| [0x01] = kvm_s390_handle_01, |
| [0x82] = kvm_s390_handle_lpsw, |
| [0x83] = kvm_s390_handle_diag, |
| [0xae] = kvm_s390_handle_sigp, |
| [0xb2] = kvm_s390_handle_b2, |
| [0xb6] = kvm_s390_handle_stctl, |
| [0xb7] = kvm_s390_handle_lctl, |
| [0xb9] = kvm_s390_handle_b9, |
| [0xe5] = kvm_s390_handle_e5, |
| [0xeb] = kvm_s390_handle_eb, |
| }; |
| |
| u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block; |
| u8 ilen = 0; |
| |
| switch (vcpu->arch.sie_block->icptcode) { |
| case ICPT_INST: |
| case ICPT_INSTPROGI: |
| case ICPT_OPEREXC: |
| case ICPT_PARTEXEC: |
| case ICPT_IOINST: |
| /* instruction only stored for these icptcodes */ |
| ilen = insn_length(vcpu->arch.sie_block->ipa >> 8); |
| /* Use the length of the EXECUTE instruction if necessary */ |
| if (sie_block->icptstatus & 1) { |
| ilen = (sie_block->icptstatus >> 4) & 0x6; |
| if (!ilen) |
| ilen = 4; |
| } |
| break; |
| case ICPT_PROGI: |
| /* bit 1+2 of pgmilc are the ilc, so we directly get ilen */ |
| ilen = vcpu->arch.sie_block->pgmilc & 0x6; |
| break; |
| } |
| return ilen; |
| } |
| |
| static int handle_noop(struct kvm_vcpu *vcpu) |
| { |
| switch (vcpu->arch.sie_block->icptcode) { |
| case 0x10: |
| vcpu->stat.exit_external_request++; |
| break; |
| default: |
| break; /* nothing */ |
| } |
| return 0; |
| } |
| |
| static int handle_stop(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| int rc = 0; |
| uint8_t flags, stop_pending; |
| |
| vcpu->stat.exit_stop_request++; |
| |
| /* delay the stop if any non-stop irq is pending */ |
| if (kvm_s390_vcpu_has_irq(vcpu, 1)) |
| return 0; |
| |
| /* avoid races with the injection/SIGP STOP code */ |
| spin_lock(&li->lock); |
| flags = li->irq.stop.flags; |
| stop_pending = kvm_s390_is_stop_irq_pending(vcpu); |
| spin_unlock(&li->lock); |
| |
| trace_kvm_s390_stop_request(stop_pending, flags); |
| if (!stop_pending) |
| return 0; |
| |
| if (flags & KVM_S390_STOP_FLAG_STORE_STATUS) { |
| rc = kvm_s390_vcpu_store_status(vcpu, |
| KVM_S390_STORE_STATUS_NOADDR); |
| if (rc) |
| return rc; |
| } |
| |
| if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) |
| kvm_s390_vcpu_stop(vcpu); |
| return -EOPNOTSUPP; |
| } |
| |
| static int handle_validity(struct kvm_vcpu *vcpu) |
| { |
| int viwhy = vcpu->arch.sie_block->ipb >> 16; |
| |
| vcpu->stat.exit_validity++; |
| trace_kvm_s390_intercept_validity(vcpu, viwhy); |
| WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy); |
| return -EOPNOTSUPP; |
| } |
| |
| static int handle_instruction(struct kvm_vcpu *vcpu) |
| { |
| intercept_handler_t handler; |
| |
| vcpu->stat.exit_instruction++; |
| trace_kvm_s390_intercept_instruction(vcpu, |
| vcpu->arch.sie_block->ipa, |
| vcpu->arch.sie_block->ipb); |
| handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8]; |
| if (handler) |
| return handler(vcpu); |
| return -EOPNOTSUPP; |
| } |
| |
| static int inject_prog_on_prog_intercept(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_pgm_info pgm_info = { |
| .code = vcpu->arch.sie_block->iprcc, |
| /* the PSW has already been rewound */ |
| .flags = KVM_S390_PGM_FLAGS_NO_REWIND, |
| }; |
| |
| switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) { |
| case PGM_AFX_TRANSLATION: |
| case PGM_ASX_TRANSLATION: |
| case PGM_EX_TRANSLATION: |
| case PGM_LFX_TRANSLATION: |
| case PGM_LSTE_SEQUENCE: |
| case PGM_LSX_TRANSLATION: |
| case PGM_LX_TRANSLATION: |
| case PGM_PRIMARY_AUTHORITY: |
| case PGM_SECONDARY_AUTHORITY: |
| case PGM_SPACE_SWITCH: |
| pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc; |
| break; |
| case PGM_ALEN_TRANSLATION: |
| case PGM_ALE_SEQUENCE: |
| case PGM_ASTE_INSTANCE: |
| case PGM_ASTE_SEQUENCE: |
| case PGM_ASTE_VALIDITY: |
| case PGM_EXTENDED_AUTHORITY: |
| pgm_info.exc_access_id = vcpu->arch.sie_block->eai; |
| break; |
| case PGM_ASCE_TYPE: |
| case PGM_PAGE_TRANSLATION: |
| case PGM_REGION_FIRST_TRANS: |
| case PGM_REGION_SECOND_TRANS: |
| case PGM_REGION_THIRD_TRANS: |
| case PGM_SEGMENT_TRANSLATION: |
| pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc; |
| pgm_info.exc_access_id = vcpu->arch.sie_block->eai; |
| pgm_info.op_access_id = vcpu->arch.sie_block->oai; |
| break; |
| case PGM_MONITOR: |
| pgm_info.mon_class_nr = vcpu->arch.sie_block->mcn; |
| pgm_info.mon_code = vcpu->arch.sie_block->tecmc; |
| break; |
| case PGM_VECTOR_PROCESSING: |
| case PGM_DATA: |
| pgm_info.data_exc_code = vcpu->arch.sie_block->dxc; |
| break; |
| case PGM_PROTECTION: |
| pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc; |
| pgm_info.exc_access_id = vcpu->arch.sie_block->eai; |
| break; |
| default: |
| break; |
| } |
| |
| if (vcpu->arch.sie_block->iprcc & PGM_PER) { |
| pgm_info.per_code = vcpu->arch.sie_block->perc; |
| pgm_info.per_atmid = vcpu->arch.sie_block->peratmid; |
| pgm_info.per_address = vcpu->arch.sie_block->peraddr; |
| pgm_info.per_access_id = vcpu->arch.sie_block->peraid; |
| } |
| return kvm_s390_inject_prog_irq(vcpu, &pgm_info); |
| } |
| |
| /* |
| * restore ITDB to program-interruption TDB in guest lowcore |
| * and set TX abort indication if required |
| */ |
| static int handle_itdb(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_itdb *itdb; |
| int rc; |
| |
| if (!IS_TE_ENABLED(vcpu) || !IS_ITDB_VALID(vcpu)) |
| return 0; |
| if (current->thread.per_flags & PER_FLAG_NO_TE) |
| return 0; |
| itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba; |
| rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb)); |
| if (rc) |
| return rc; |
| memset(itdb, 0, sizeof(*itdb)); |
| |
| return 0; |
| } |
| |
| #define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER) |
| |
| static int handle_prog(struct kvm_vcpu *vcpu) |
| { |
| psw_t psw; |
| int rc; |
| |
| vcpu->stat.exit_program_interruption++; |
| |
| if (guestdbg_enabled(vcpu) && per_event(vcpu)) { |
| kvm_s390_handle_per_event(vcpu); |
| /* the interrupt might have been filtered out completely */ |
| if (vcpu->arch.sie_block->iprcc == 0) |
| return 0; |
| } |
| |
| trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc); |
| if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) { |
| rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t)); |
| if (rc) |
| return rc; |
| /* Avoid endless loops of specification exceptions */ |
| if (!is_valid_psw(&psw)) |
| return -EOPNOTSUPP; |
| } |
| rc = handle_itdb(vcpu); |
| if (rc) |
| return rc; |
| |
| return inject_prog_on_prog_intercept(vcpu); |
| } |
| |
| /** |
| * handle_external_interrupt - used for external interruption interceptions |
| * |
| * This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if |
| * the new PSW does not have external interrupts disabled. In the first case, |
| * we've got to deliver the interrupt manually, and in the second case, we |
| * drop to userspace to handle the situation there. |
| */ |
| static int handle_external_interrupt(struct kvm_vcpu *vcpu) |
| { |
| u16 eic = vcpu->arch.sie_block->eic; |
| struct kvm_s390_irq irq; |
| psw_t newpsw; |
| int rc; |
| |
| vcpu->stat.exit_external_interrupt++; |
| |
| rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t)); |
| if (rc) |
| return rc; |
| /* We can not handle clock comparator or timer interrupt with bad PSW */ |
| if ((eic == EXT_IRQ_CLK_COMP || eic == EXT_IRQ_CPU_TIMER) && |
| (newpsw.mask & PSW_MASK_EXT)) |
| return -EOPNOTSUPP; |
| |
| switch (eic) { |
| case EXT_IRQ_CLK_COMP: |
| irq.type = KVM_S390_INT_CLOCK_COMP; |
| break; |
| case EXT_IRQ_CPU_TIMER: |
| irq.type = KVM_S390_INT_CPU_TIMER; |
| break; |
| case EXT_IRQ_EXTERNAL_CALL: |
| irq.type = KVM_S390_INT_EXTERNAL_CALL; |
| irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr; |
| rc = kvm_s390_inject_vcpu(vcpu, &irq); |
| /* ignore if another external call is already pending */ |
| if (rc == -EBUSY) |
| return 0; |
| return rc; |
| default: |
| return -EOPNOTSUPP; |
| } |
| |
| return kvm_s390_inject_vcpu(vcpu, &irq); |
| } |
| |
| /** |
| * Handle MOVE PAGE partial execution interception. |
| * |
| * This interception can only happen for guests with DAT disabled and |
| * addresses that are currently not mapped in the host. Thus we try to |
| * set up the mappings for the corresponding user pages here (or throw |
| * addressing exceptions in case of illegal guest addresses). |
| */ |
| static int handle_mvpg_pei(struct kvm_vcpu *vcpu) |
| { |
| unsigned long srcaddr, dstaddr; |
| int reg1, reg2, rc; |
| |
| kvm_s390_get_regs_rre(vcpu, ®1, ®2); |
| |
| /* Make sure that the source is paged-in */ |
| rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg2], |
| reg2, &srcaddr, GACC_FETCH); |
| if (rc) |
| return kvm_s390_inject_prog_cond(vcpu, rc); |
| rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0); |
| if (rc != 0) |
| return rc; |
| |
| /* Make sure that the destination is paged-in */ |
| rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg1], |
| reg1, &dstaddr, GACC_STORE); |
| if (rc) |
| return kvm_s390_inject_prog_cond(vcpu, rc); |
| rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1); |
| if (rc != 0) |
| return rc; |
| |
| kvm_s390_retry_instr(vcpu); |
| |
| return 0; |
| } |
| |
| static int handle_partial_execution(struct kvm_vcpu *vcpu) |
| { |
| vcpu->stat.exit_pei++; |
| |
| if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */ |
| return handle_mvpg_pei(vcpu); |
| if (vcpu->arch.sie_block->ipa >> 8 == 0xae) /* SIGP */ |
| return kvm_s390_handle_sigp_pei(vcpu); |
| |
| return -EOPNOTSUPP; |
| } |
| |
| static int handle_operexc(struct kvm_vcpu *vcpu) |
| { |
| vcpu->stat.exit_operation_exception++; |
| trace_kvm_s390_handle_operexc(vcpu, vcpu->arch.sie_block->ipa, |
| vcpu->arch.sie_block->ipb); |
| |
| if (vcpu->arch.sie_block->ipa == 0xb256 && |
| test_kvm_facility(vcpu->kvm, 74)) |
| return handle_sthyi(vcpu); |
| |
| if (vcpu->arch.sie_block->ipa == 0 && vcpu->kvm->arch.user_instr0) |
| return -EOPNOTSUPP; |
| |
| return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); |
| } |
| |
| int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu) |
| { |
| int rc, per_rc = 0; |
| |
| if (kvm_is_ucontrol(vcpu->kvm)) |
| return -EOPNOTSUPP; |
| |
| switch (vcpu->arch.sie_block->icptcode) { |
| case 0x10: |
| case 0x18: |
| return handle_noop(vcpu); |
| case 0x04: |
| rc = handle_instruction(vcpu); |
| break; |
| case 0x08: |
| return handle_prog(vcpu); |
| case 0x14: |
| return handle_external_interrupt(vcpu); |
| case 0x1c: |
| return kvm_s390_handle_wait(vcpu); |
| case 0x20: |
| return handle_validity(vcpu); |
| case 0x28: |
| return handle_stop(vcpu); |
| case 0x2c: |
| rc = handle_operexc(vcpu); |
| break; |
| case 0x38: |
| rc = handle_partial_execution(vcpu); |
| break; |
| default: |
| return -EOPNOTSUPP; |
| } |
| |
| /* process PER, also if the instrution is processed in user space */ |
| if (vcpu->arch.sie_block->icptstatus & 0x02 && |
| (!rc || rc == -EOPNOTSUPP)) |
| per_rc = kvm_s390_handle_per_ifetch_icpt(vcpu); |
| return per_rc ? per_rc : rc; |
| } |