diff options
Diffstat (limited to 'arch/s390/kvm/intercept.c')
| -rw-r--r-- | arch/s390/kvm/intercept.c | 492 |
1 files changed, 492 insertions, 0 deletions
diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c new file mode 100644 index 000000000..a389fa85c --- /dev/null +++ b/arch/s390/kvm/intercept.c @@ -0,0 +1,492 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * in-kernel handling for sie intercepts + * + * Copyright IBM Corp. 2008, 2014 + * + * 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 <asm/sysinfo.h> + +#include "kvm-s390.h" +#include "gaccess.h" +#include "trace.h" +#include "trace-s390.h" + +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_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); + KVM_EVENT(3, "validity intercept 0x%x for pid %u (kvm 0x%pK)", viwhy, + current->pid, vcpu->kvm); + + /* do not warn on invalid runtime instrumentation mode */ + WARN_ONCE(viwhy != 0x44, "kvm: unhandled validity intercept 0x%x\n", + viwhy); + return -EINVAL; +} + +static int handle_instruction(struct kvm_vcpu *vcpu) +{ + vcpu->stat.exit_instruction++; + trace_kvm_s390_intercept_instruction(vcpu, + vcpu->arch.sie_block->ipa, + vcpu->arch.sie_block->ipb); + + switch (vcpu->arch.sie_block->ipa >> 8) { + case 0x01: + return kvm_s390_handle_01(vcpu); + case 0x82: + return kvm_s390_handle_lpsw(vcpu); + case 0x83: + return kvm_s390_handle_diag(vcpu); + case 0xaa: + return kvm_s390_handle_aa(vcpu); + case 0xae: + return kvm_s390_handle_sigp(vcpu); + case 0xb2: + return kvm_s390_handle_b2(vcpu); + case 0xb6: + return kvm_s390_handle_stctl(vcpu); + case 0xb7: + return kvm_s390_handle_lctl(vcpu); + case 0xb9: + return kvm_s390_handle_b9(vcpu); + case 0xe3: + return kvm_s390_handle_e3(vcpu); + case 0xe5: + return kvm_s390_handle_e5(vcpu); + case 0xeb: + return kvm_s390_handle_eb(vcpu); + default: + 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)) { + rc = kvm_s390_handle_per_event(vcpu); + if (rc) + return rc; + /* 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; +} + +/* + * Handle the sthyi instruction that provides the guest with system + * information, like current CPU resources available at each level of + * the machine. + */ +int handle_sthyi(struct kvm_vcpu *vcpu) +{ + int reg1, reg2, r = 0; + u64 code, addr, cc = 0, rc = 0; + struct sthyi_sctns *sctns = NULL; + + if (!test_kvm_facility(vcpu->kvm, 74)) + return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); + + kvm_s390_get_regs_rre(vcpu, ®1, ®2); + code = vcpu->run->s.regs.gprs[reg1]; + addr = vcpu->run->s.regs.gprs[reg2]; + + vcpu->stat.instruction_sthyi++; + VCPU_EVENT(vcpu, 3, "STHYI: fc: %llu addr: 0x%016llx", code, addr); + trace_kvm_s390_handle_sthyi(vcpu, code, addr); + + if (reg1 == reg2 || reg1 & 1 || reg2 & 1) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + + if (code & 0xffff) { + cc = 3; + rc = 4; + goto out; + } + + if (addr & ~PAGE_MASK) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + + sctns = (void *)get_zeroed_page(GFP_KERNEL); + if (!sctns) + return -ENOMEM; + + cc = sthyi_fill(sctns, &rc); + +out: + if (!cc) { + r = write_guest(vcpu, addr, reg2, sctns, PAGE_SIZE); + if (r) { + free_page((unsigned long)sctns); + return kvm_s390_inject_prog_cond(vcpu, r); + } + } + + free_page((unsigned long)sctns); + vcpu->run->s.regs.gprs[reg2 + 1] = rc; + kvm_s390_set_psw_cc(vcpu, cc); + return r; +} + +static int handle_operexc(struct kvm_vcpu *vcpu) +{ + psw_t oldpsw, newpsw; + int rc; + + 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) + return handle_sthyi(vcpu); + + if (vcpu->arch.sie_block->ipa == 0 && vcpu->kvm->arch.user_instr0) + return -EOPNOTSUPP; + rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &newpsw, sizeof(psw_t)); + if (rc) + return rc; + /* + * Avoid endless loops of operation exceptions, if the pgm new + * PSW will cause a new operation exception. + * The heuristic checks if the pgm new psw is within 6 bytes before + * the faulting psw address (with same DAT, AS settings) and the + * new psw is not a wait psw and the fault was not triggered by + * problem state. + */ + oldpsw = vcpu->arch.sie_block->gpsw; + if (oldpsw.addr - newpsw.addr <= 6 && + !(newpsw.mask & PSW_MASK_WAIT) && + !(oldpsw.mask & PSW_MASK_PSTATE) && + (newpsw.mask & PSW_MASK_ASC) == (oldpsw.mask & PSW_MASK_ASC) && + (newpsw.mask & PSW_MASK_DAT) == (oldpsw.mask & PSW_MASK_DAT)) + 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 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; + 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; +} |