416 lines
11 KiB
C
416 lines
11 KiB
C
/*
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* in-kernel handling for sie intercepts
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*
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* Copyright IBM Corp. 2008, 2014
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License (version 2 only)
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* as published by the Free Software Foundation.
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*
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* Author(s): Carsten Otte <cotte@de.ibm.com>
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* Christian Borntraeger <borntraeger@de.ibm.com>
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*/
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#include <linux/kvm_host.h>
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#include <linux/errno.h>
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#include <linux/pagemap.h>
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#include <asm/kvm_host.h>
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#include <asm/asm-offsets.h>
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#include <asm/irq.h>
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#include "kvm-s390.h"
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#include "gaccess.h"
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#include "trace.h"
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#include "trace-s390.h"
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static const intercept_handler_t instruction_handlers[256] = {
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[0x01] = kvm_s390_handle_01,
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[0x82] = kvm_s390_handle_lpsw,
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[0x83] = kvm_s390_handle_diag,
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[0xaa] = kvm_s390_handle_aa,
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[0xae] = kvm_s390_handle_sigp,
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[0xb2] = kvm_s390_handle_b2,
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[0xb6] = kvm_s390_handle_stctl,
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[0xb7] = kvm_s390_handle_lctl,
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[0xb9] = kvm_s390_handle_b9,
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[0xe5] = kvm_s390_handle_e5,
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[0xeb] = kvm_s390_handle_eb,
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};
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u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu)
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{
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struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
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u8 ilen = 0;
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switch (vcpu->arch.sie_block->icptcode) {
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case ICPT_INST:
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case ICPT_INSTPROGI:
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case ICPT_OPEREXC:
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case ICPT_PARTEXEC:
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case ICPT_IOINST:
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/* instruction only stored for these icptcodes */
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ilen = insn_length(vcpu->arch.sie_block->ipa >> 8);
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/* Use the length of the EXECUTE instruction if necessary */
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if (sie_block->icptstatus & 1) {
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ilen = (sie_block->icptstatus >> 4) & 0x6;
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if (!ilen)
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ilen = 4;
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}
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break;
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case ICPT_PROGI:
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/* bit 1+2 of pgmilc are the ilc, so we directly get ilen */
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ilen = vcpu->arch.sie_block->pgmilc & 0x6;
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break;
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}
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return ilen;
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}
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static int handle_noop(struct kvm_vcpu *vcpu)
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{
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switch (vcpu->arch.sie_block->icptcode) {
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case 0x10:
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vcpu->stat.exit_external_request++;
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break;
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default:
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break; /* nothing */
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}
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return 0;
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}
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static int handle_stop(struct kvm_vcpu *vcpu)
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{
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struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
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int rc = 0;
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uint8_t flags, stop_pending;
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vcpu->stat.exit_stop_request++;
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/* delay the stop if any non-stop irq is pending */
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if (kvm_s390_vcpu_has_irq(vcpu, 1))
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return 0;
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/* avoid races with the injection/SIGP STOP code */
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spin_lock(&li->lock);
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flags = li->irq.stop.flags;
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stop_pending = kvm_s390_is_stop_irq_pending(vcpu);
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spin_unlock(&li->lock);
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trace_kvm_s390_stop_request(stop_pending, flags);
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if (!stop_pending)
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return 0;
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if (flags & KVM_S390_STOP_FLAG_STORE_STATUS) {
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rc = kvm_s390_vcpu_store_status(vcpu,
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KVM_S390_STORE_STATUS_NOADDR);
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if (rc)
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return rc;
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}
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if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
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kvm_s390_vcpu_stop(vcpu);
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return -EOPNOTSUPP;
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}
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static int handle_validity(struct kvm_vcpu *vcpu)
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{
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int viwhy = vcpu->arch.sie_block->ipb >> 16;
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vcpu->stat.exit_validity++;
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trace_kvm_s390_intercept_validity(vcpu, viwhy);
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KVM_EVENT(3, "validity intercept 0x%x for pid %u (kvm 0x%pK)", viwhy,
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current->pid, vcpu->kvm);
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/* do not warn on invalid runtime instrumentation mode */
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WARN_ONCE(viwhy != 0x44, "kvm: unhandled validity intercept 0x%x\n",
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viwhy);
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return -EINVAL;
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}
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static int handle_instruction(struct kvm_vcpu *vcpu)
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{
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intercept_handler_t handler;
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vcpu->stat.exit_instruction++;
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trace_kvm_s390_intercept_instruction(vcpu,
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vcpu->arch.sie_block->ipa,
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vcpu->arch.sie_block->ipb);
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handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
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if (handler)
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return handler(vcpu);
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return -EOPNOTSUPP;
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}
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static int inject_prog_on_prog_intercept(struct kvm_vcpu *vcpu)
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{
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struct kvm_s390_pgm_info pgm_info = {
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.code = vcpu->arch.sie_block->iprcc,
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/* the PSW has already been rewound */
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.flags = KVM_S390_PGM_FLAGS_NO_REWIND,
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};
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switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) {
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case PGM_AFX_TRANSLATION:
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case PGM_ASX_TRANSLATION:
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case PGM_EX_TRANSLATION:
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case PGM_LFX_TRANSLATION:
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case PGM_LSTE_SEQUENCE:
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case PGM_LSX_TRANSLATION:
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case PGM_LX_TRANSLATION:
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case PGM_PRIMARY_AUTHORITY:
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case PGM_SECONDARY_AUTHORITY:
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case PGM_SPACE_SWITCH:
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pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
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break;
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case PGM_ALEN_TRANSLATION:
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case PGM_ALE_SEQUENCE:
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case PGM_ASTE_INSTANCE:
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case PGM_ASTE_SEQUENCE:
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case PGM_ASTE_VALIDITY:
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case PGM_EXTENDED_AUTHORITY:
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pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
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break;
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case PGM_ASCE_TYPE:
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case PGM_PAGE_TRANSLATION:
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case PGM_REGION_FIRST_TRANS:
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case PGM_REGION_SECOND_TRANS:
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case PGM_REGION_THIRD_TRANS:
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case PGM_SEGMENT_TRANSLATION:
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pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
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pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
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pgm_info.op_access_id = vcpu->arch.sie_block->oai;
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break;
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case PGM_MONITOR:
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pgm_info.mon_class_nr = vcpu->arch.sie_block->mcn;
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pgm_info.mon_code = vcpu->arch.sie_block->tecmc;
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break;
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case PGM_VECTOR_PROCESSING:
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case PGM_DATA:
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pgm_info.data_exc_code = vcpu->arch.sie_block->dxc;
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break;
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case PGM_PROTECTION:
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pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
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pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
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break;
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default:
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break;
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}
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if (vcpu->arch.sie_block->iprcc & PGM_PER) {
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pgm_info.per_code = vcpu->arch.sie_block->perc;
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pgm_info.per_atmid = vcpu->arch.sie_block->peratmid;
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pgm_info.per_address = vcpu->arch.sie_block->peraddr;
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pgm_info.per_access_id = vcpu->arch.sie_block->peraid;
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}
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return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
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}
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/*
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* restore ITDB to program-interruption TDB in guest lowcore
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* and set TX abort indication if required
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*/
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static int handle_itdb(struct kvm_vcpu *vcpu)
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{
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struct kvm_s390_itdb *itdb;
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int rc;
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if (!IS_TE_ENABLED(vcpu) || !IS_ITDB_VALID(vcpu))
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return 0;
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if (current->thread.per_flags & PER_FLAG_NO_TE)
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return 0;
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itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba;
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rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb));
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if (rc)
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return rc;
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memset(itdb, 0, sizeof(*itdb));
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return 0;
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}
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#define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER)
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static int handle_prog(struct kvm_vcpu *vcpu)
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{
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psw_t psw;
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int rc;
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vcpu->stat.exit_program_interruption++;
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if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
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kvm_s390_handle_per_event(vcpu);
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/* the interrupt might have been filtered out completely */
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if (vcpu->arch.sie_block->iprcc == 0)
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return 0;
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}
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trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
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if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) {
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rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t));
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if (rc)
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return rc;
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/* Avoid endless loops of specification exceptions */
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if (!is_valid_psw(&psw))
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return -EOPNOTSUPP;
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}
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rc = handle_itdb(vcpu);
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if (rc)
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return rc;
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return inject_prog_on_prog_intercept(vcpu);
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}
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/**
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* handle_external_interrupt - used for external interruption interceptions
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*
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* This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if
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* the new PSW does not have external interrupts disabled. In the first case,
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* we've got to deliver the interrupt manually, and in the second case, we
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* drop to userspace to handle the situation there.
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*/
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static int handle_external_interrupt(struct kvm_vcpu *vcpu)
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{
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u16 eic = vcpu->arch.sie_block->eic;
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struct kvm_s390_irq irq;
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psw_t newpsw;
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int rc;
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vcpu->stat.exit_external_interrupt++;
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rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t));
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if (rc)
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return rc;
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/* We can not handle clock comparator or timer interrupt with bad PSW */
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if ((eic == EXT_IRQ_CLK_COMP || eic == EXT_IRQ_CPU_TIMER) &&
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(newpsw.mask & PSW_MASK_EXT))
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return -EOPNOTSUPP;
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switch (eic) {
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case EXT_IRQ_CLK_COMP:
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irq.type = KVM_S390_INT_CLOCK_COMP;
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break;
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case EXT_IRQ_CPU_TIMER:
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irq.type = KVM_S390_INT_CPU_TIMER;
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break;
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case EXT_IRQ_EXTERNAL_CALL:
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irq.type = KVM_S390_INT_EXTERNAL_CALL;
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irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr;
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rc = kvm_s390_inject_vcpu(vcpu, &irq);
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/* ignore if another external call is already pending */
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if (rc == -EBUSY)
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return 0;
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return rc;
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default:
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return -EOPNOTSUPP;
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}
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return kvm_s390_inject_vcpu(vcpu, &irq);
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}
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/**
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* Handle MOVE PAGE partial execution interception.
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*
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* This interception can only happen for guests with DAT disabled and
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* addresses that are currently not mapped in the host. Thus we try to
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* set up the mappings for the corresponding user pages here (or throw
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* addressing exceptions in case of illegal guest addresses).
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*/
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static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
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{
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unsigned long srcaddr, dstaddr;
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int reg1, reg2, rc;
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kvm_s390_get_regs_rre(vcpu, ®1, ®2);
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/* Make sure that the source is paged-in */
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rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg2],
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reg2, &srcaddr, GACC_FETCH);
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if (rc)
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return kvm_s390_inject_prog_cond(vcpu, rc);
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rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0);
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if (rc != 0)
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return rc;
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/* Make sure that the destination is paged-in */
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rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg1],
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reg1, &dstaddr, GACC_STORE);
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if (rc)
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return kvm_s390_inject_prog_cond(vcpu, rc);
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rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1);
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if (rc != 0)
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return rc;
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kvm_s390_retry_instr(vcpu);
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return 0;
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}
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static int handle_partial_execution(struct kvm_vcpu *vcpu)
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{
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vcpu->stat.exit_pei++;
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if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */
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return handle_mvpg_pei(vcpu);
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if (vcpu->arch.sie_block->ipa >> 8 == 0xae) /* SIGP */
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return kvm_s390_handle_sigp_pei(vcpu);
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return -EOPNOTSUPP;
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}
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static int handle_operexc(struct kvm_vcpu *vcpu)
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{
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vcpu->stat.exit_operation_exception++;
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trace_kvm_s390_handle_operexc(vcpu, vcpu->arch.sie_block->ipa,
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vcpu->arch.sie_block->ipb);
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if (vcpu->arch.sie_block->ipa == 0xb256 &&
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test_kvm_facility(vcpu->kvm, 74))
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return handle_sthyi(vcpu);
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if (vcpu->arch.sie_block->ipa == 0 && vcpu->kvm->arch.user_instr0)
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return -EOPNOTSUPP;
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return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
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}
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int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
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{
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int rc, per_rc = 0;
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if (kvm_is_ucontrol(vcpu->kvm))
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return -EOPNOTSUPP;
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switch (vcpu->arch.sie_block->icptcode) {
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case 0x10:
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case 0x18:
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return handle_noop(vcpu);
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case 0x04:
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rc = handle_instruction(vcpu);
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break;
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case 0x08:
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return handle_prog(vcpu);
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case 0x14:
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return handle_external_interrupt(vcpu);
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case 0x1c:
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return kvm_s390_handle_wait(vcpu);
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case 0x20:
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return handle_validity(vcpu);
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case 0x28:
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return handle_stop(vcpu);
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case 0x2c:
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rc = handle_operexc(vcpu);
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break;
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case 0x38:
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rc = handle_partial_execution(vcpu);
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break;
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default:
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return -EOPNOTSUPP;
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}
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/* process PER, also if the instrution is processed in user space */
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if (vcpu->arch.sie_block->icptstatus & 0x02 &&
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(!rc || rc == -EOPNOTSUPP))
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per_rc = kvm_s390_handle_per_ifetch_icpt(vcpu);
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return per_rc ? per_rc : rc;
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}
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