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601 lines
16 KiB
601 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* in-kernel handling for sie intercepts |
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* |
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* Copyright IBM Corp. 2008, 2020 |
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* |
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* Author(s): Carsten Otte <[email protected]> |
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* Christian Borntraeger <[email protected]> |
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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/asm-offsets.h> |
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#include <asm/irq.h> |
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#include <asm/sysinfo.h> |
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#include <asm/uv.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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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_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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|
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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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/* |
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* no need to check the return value of vcpu_stop as it can only have |
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* an error for protvirt, but protvirt means user cpu state |
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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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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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switch (vcpu->arch.sie_block->ipa >> 8) { |
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case 0x01: |
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return kvm_s390_handle_01(vcpu); |
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case 0x82: |
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return kvm_s390_handle_lpsw(vcpu); |
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case 0x83: |
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return kvm_s390_handle_diag(vcpu); |
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case 0xaa: |
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return kvm_s390_handle_aa(vcpu); |
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case 0xae: |
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return kvm_s390_handle_sigp(vcpu); |
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case 0xb2: |
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return kvm_s390_handle_b2(vcpu); |
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case 0xb6: |
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return kvm_s390_handle_stctl(vcpu); |
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case 0xb7: |
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return kvm_s390_handle_lctl(vcpu); |
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case 0xb9: |
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return kvm_s390_handle_b9(vcpu); |
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case 0xe3: |
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return kvm_s390_handle_e3(vcpu); |
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case 0xe5: |
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return kvm_s390_handle_e5(vcpu); |
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case 0xeb: |
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return kvm_s390_handle_eb(vcpu); |
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default: |
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return -EOPNOTSUPP; |
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} |
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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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/* |
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* Intercept 8 indicates a loop of specification exceptions |
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* for protected guests. |
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*/ |
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if (kvm_s390_pv_cpu_is_protected(vcpu)) |
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return -EOPNOTSUPP; |
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if (guestdbg_enabled(vcpu) && per_event(vcpu)) { |
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rc = kvm_s390_handle_per_event(vcpu); |
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if (rc) |
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return rc; |
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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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/* |
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* Handle the sthyi instruction that provides the guest with system |
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* information, like current CPU resources available at each level of |
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* the machine. |
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*/ |
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int handle_sthyi(struct kvm_vcpu *vcpu) |
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{ |
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int reg1, reg2, r = 0; |
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u64 code, addr, cc = 0, rc = 0; |
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struct sthyi_sctns *sctns = NULL; |
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if (!test_kvm_facility(vcpu->kvm, 74)) |
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return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); |
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kvm_s390_get_regs_rre(vcpu, ®1, ®2); |
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code = vcpu->run->s.regs.gprs[reg1]; |
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addr = vcpu->run->s.regs.gprs[reg2]; |
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vcpu->stat.instruction_sthyi++; |
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VCPU_EVENT(vcpu, 3, "STHYI: fc: %llu addr: 0x%016llx", code, addr); |
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trace_kvm_s390_handle_sthyi(vcpu, code, addr); |
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if (reg1 == reg2 || reg1 & 1 || reg2 & 1) |
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return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
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if (code & 0xffff) { |
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cc = 3; |
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rc = 4; |
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goto out; |
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} |
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if (!kvm_s390_pv_cpu_is_protected(vcpu) && (addr & ~PAGE_MASK)) |
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return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
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sctns = (void *)get_zeroed_page(GFP_KERNEL_ACCOUNT); |
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if (!sctns) |
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return -ENOMEM; |
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cc = sthyi_fill(sctns, &rc); |
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out: |
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if (!cc) { |
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if (kvm_s390_pv_cpu_is_protected(vcpu)) { |
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memcpy((void *)(sida_origin(vcpu->arch.sie_block)), |
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sctns, PAGE_SIZE); |
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} else { |
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r = write_guest(vcpu, addr, reg2, sctns, PAGE_SIZE); |
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if (r) { |
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free_page((unsigned long)sctns); |
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return kvm_s390_inject_prog_cond(vcpu, r); |
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} |
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} |
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} |
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free_page((unsigned long)sctns); |
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vcpu->run->s.regs.gprs[reg2 + 1] = rc; |
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kvm_s390_set_psw_cc(vcpu, cc); |
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return r; |
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} |
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static int handle_operexc(struct kvm_vcpu *vcpu) |
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{ |
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psw_t oldpsw, newpsw; |
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int rc; |
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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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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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rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &newpsw, sizeof(psw_t)); |
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if (rc) |
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return rc; |
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/* |
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* Avoid endless loops of operation exceptions, if the pgm new |
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* PSW will cause a new operation exception. |
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* The heuristic checks if the pgm new psw is within 6 bytes before |
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* the faulting psw address (with same DAT, AS settings) and the |
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* new psw is not a wait psw and the fault was not triggered by |
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* problem state. |
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*/ |
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oldpsw = vcpu->arch.sie_block->gpsw; |
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if (oldpsw.addr - newpsw.addr <= 6 && |
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!(newpsw.mask & PSW_MASK_WAIT) && |
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!(oldpsw.mask & PSW_MASK_PSTATE) && |
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(newpsw.mask & PSW_MASK_ASC) == (oldpsw.mask & PSW_MASK_ASC) && |
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(newpsw.mask & PSW_MASK_DAT) == (oldpsw.mask & PSW_MASK_DAT)) |
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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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static int handle_pv_spx(struct kvm_vcpu *vcpu) |
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{ |
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u32 pref = *(u32 *)vcpu->arch.sie_block->sidad; |
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kvm_s390_set_prefix(vcpu, pref); |
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trace_kvm_s390_handle_prefix(vcpu, 1, pref); |
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return 0; |
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} |
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static int handle_pv_sclp(struct kvm_vcpu *vcpu) |
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{ |
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struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; |
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|
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spin_lock(&fi->lock); |
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/* |
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* 2 cases: |
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* a: an sccb answering interrupt was already pending or in flight. |
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* As the sccb value is not known we can simply set some value to |
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* trigger delivery of a saved SCCB. UV will then use its saved |
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* copy of the SCCB value. |
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* b: an error SCCB interrupt needs to be injected so we also inject |
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* a fake SCCB address. Firmware will use the proper one. |
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* This makes sure, that both errors and real sccb returns will only |
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* be delivered after a notification intercept (instruction has |
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* finished) but not after others. |
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*/ |
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fi->srv_signal.ext_params |= 0x43000; |
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set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs); |
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clear_bit(IRQ_PEND_EXT_SERVICE, &fi->masked_irqs); |
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spin_unlock(&fi->lock); |
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return 0; |
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} |
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static int handle_pv_uvc(struct kvm_vcpu *vcpu) |
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{ |
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struct uv_cb_share *guest_uvcb = (void *)vcpu->arch.sie_block->sidad; |
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struct uv_cb_cts uvcb = { |
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.header.cmd = UVC_CMD_UNPIN_PAGE_SHARED, |
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.header.len = sizeof(uvcb), |
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.guest_handle = kvm_s390_pv_get_handle(vcpu->kvm), |
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.gaddr = guest_uvcb->paddr, |
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}; |
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int rc; |
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if (guest_uvcb->header.cmd != UVC_CMD_REMOVE_SHARED_ACCESS) { |
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WARN_ONCE(1, "Unexpected notification intercept for UVC 0x%x\n", |
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guest_uvcb->header.cmd); |
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return 0; |
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} |
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rc = gmap_make_secure(vcpu->arch.gmap, uvcb.gaddr, &uvcb); |
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/* |
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* If the unpin did not succeed, the guest will exit again for the UVC |
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* and we will retry the unpin. |
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*/ |
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if (rc == -EINVAL) |
|
return 0; |
|
return rc; |
|
} |
|
|
|
static int handle_pv_notification(struct kvm_vcpu *vcpu) |
|
{ |
|
if (vcpu->arch.sie_block->ipa == 0xb210) |
|
return handle_pv_spx(vcpu); |
|
if (vcpu->arch.sie_block->ipa == 0xb220) |
|
return handle_pv_sclp(vcpu); |
|
if (vcpu->arch.sie_block->ipa == 0xb9a4) |
|
return handle_pv_uvc(vcpu); |
|
|
|
return handle_instruction(vcpu); |
|
} |
|
|
|
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 ICPT_EXTREQ: |
|
vcpu->stat.exit_external_request++; |
|
return 0; |
|
case ICPT_IOREQ: |
|
vcpu->stat.exit_io_request++; |
|
return 0; |
|
case ICPT_INST: |
|
rc = handle_instruction(vcpu); |
|
break; |
|
case ICPT_PROGI: |
|
return handle_prog(vcpu); |
|
case ICPT_EXTINT: |
|
return handle_external_interrupt(vcpu); |
|
case ICPT_WAIT: |
|
return kvm_s390_handle_wait(vcpu); |
|
case ICPT_VALIDITY: |
|
return handle_validity(vcpu); |
|
case ICPT_STOP: |
|
return handle_stop(vcpu); |
|
case ICPT_OPEREXC: |
|
rc = handle_operexc(vcpu); |
|
break; |
|
case ICPT_PARTEXEC: |
|
rc = handle_partial_execution(vcpu); |
|
break; |
|
case ICPT_KSS: |
|
rc = kvm_s390_skey_check_enable(vcpu); |
|
break; |
|
case ICPT_MCHKREQ: |
|
case ICPT_INT_ENABLE: |
|
/* |
|
* PSW bit 13 or a CR (0, 6, 14) changed and we might |
|
* now be able to deliver interrupts. The pre-run code |
|
* will take care of this. |
|
*/ |
|
rc = 0; |
|
break; |
|
case ICPT_PV_INSTR: |
|
rc = handle_instruction(vcpu); |
|
break; |
|
case ICPT_PV_NOTIFY: |
|
rc = handle_pv_notification(vcpu); |
|
break; |
|
case ICPT_PV_PREF: |
|
rc = 0; |
|
gmap_convert_to_secure(vcpu->arch.gmap, |
|
kvm_s390_get_prefix(vcpu)); |
|
gmap_convert_to_secure(vcpu->arch.gmap, |
|
kvm_s390_get_prefix(vcpu) + PAGE_SIZE); |
|
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; |
|
}
|
|
|