| /* |
| * handling kvm guest interrupts |
| * |
| * Copyright IBM Corp. 2008, 2015 |
| * |
| * 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> |
| */ |
| |
| #include <linux/interrupt.h> |
| #include <linux/kvm_host.h> |
| #include <linux/hrtimer.h> |
| #include <linux/mmu_context.h> |
| #include <linux/signal.h> |
| #include <linux/slab.h> |
| #include <linux/bitmap.h> |
| #include <linux/vmalloc.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/dis.h> |
| #include <asm/uaccess.h> |
| #include <asm/sclp.h> |
| #include <asm/isc.h> |
| #include "kvm-s390.h" |
| #include "gaccess.h" |
| #include "trace-s390.h" |
| |
| #define IOINT_SCHID_MASK 0x0000ffff |
| #define IOINT_SSID_MASK 0x00030000 |
| #define IOINT_CSSID_MASK 0x03fc0000 |
| #define PFAULT_INIT 0x0600 |
| #define PFAULT_DONE 0x0680 |
| #define VIRTIO_PARAM 0x0d00 |
| |
| /* handle external calls via sigp interpretation facility */ |
| static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id) |
| { |
| int c, scn; |
| |
| read_lock(&vcpu->kvm->arch.sca_lock); |
| if (vcpu->kvm->arch.use_esca) { |
| struct esca_block *sca = vcpu->kvm->arch.sca; |
| union esca_sigp_ctrl sigp_ctrl = |
| sca->cpu[vcpu->vcpu_id].sigp_ctrl; |
| |
| c = sigp_ctrl.c; |
| scn = sigp_ctrl.scn; |
| } else { |
| struct bsca_block *sca = vcpu->kvm->arch.sca; |
| union bsca_sigp_ctrl sigp_ctrl = |
| sca->cpu[vcpu->vcpu_id].sigp_ctrl; |
| |
| c = sigp_ctrl.c; |
| scn = sigp_ctrl.scn; |
| } |
| read_unlock(&vcpu->kvm->arch.sca_lock); |
| |
| if (src_id) |
| *src_id = scn; |
| |
| return c && atomic_read(&vcpu->arch.sie_block->cpuflags) & |
| CPUSTAT_ECALL_PEND; |
| } |
| |
| static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id) |
| { |
| int expect, rc; |
| |
| read_lock(&vcpu->kvm->arch.sca_lock); |
| if (vcpu->kvm->arch.use_esca) { |
| struct esca_block *sca = vcpu->kvm->arch.sca; |
| union esca_sigp_ctrl *sigp_ctrl = |
| &(sca->cpu[vcpu->vcpu_id].sigp_ctrl); |
| union esca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl; |
| |
| new_val.scn = src_id; |
| new_val.c = 1; |
| old_val.c = 0; |
| |
| expect = old_val.value; |
| rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value); |
| } else { |
| struct bsca_block *sca = vcpu->kvm->arch.sca; |
| union bsca_sigp_ctrl *sigp_ctrl = |
| &(sca->cpu[vcpu->vcpu_id].sigp_ctrl); |
| union bsca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl; |
| |
| new_val.scn = src_id; |
| new_val.c = 1; |
| old_val.c = 0; |
| |
| expect = old_val.value; |
| rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value); |
| } |
| read_unlock(&vcpu->kvm->arch.sca_lock); |
| |
| if (rc != expect) { |
| /* another external call is pending */ |
| return -EBUSY; |
| } |
| atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags); |
| return 0; |
| } |
| |
| static void sca_clear_ext_call(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| int rc, expect; |
| |
| atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags); |
| read_lock(&vcpu->kvm->arch.sca_lock); |
| if (vcpu->kvm->arch.use_esca) { |
| struct esca_block *sca = vcpu->kvm->arch.sca; |
| union esca_sigp_ctrl *sigp_ctrl = |
| &(sca->cpu[vcpu->vcpu_id].sigp_ctrl); |
| union esca_sigp_ctrl old = *sigp_ctrl; |
| |
| expect = old.value; |
| rc = cmpxchg(&sigp_ctrl->value, old.value, 0); |
| } else { |
| struct bsca_block *sca = vcpu->kvm->arch.sca; |
| union bsca_sigp_ctrl *sigp_ctrl = |
| &(sca->cpu[vcpu->vcpu_id].sigp_ctrl); |
| union bsca_sigp_ctrl old = *sigp_ctrl; |
| |
| expect = old.value; |
| rc = cmpxchg(&sigp_ctrl->value, old.value, 0); |
| } |
| read_unlock(&vcpu->kvm->arch.sca_lock); |
| WARN_ON(rc != expect); /* cannot clear? */ |
| } |
| |
| int psw_extint_disabled(struct kvm_vcpu *vcpu) |
| { |
| return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT); |
| } |
| |
| static int psw_ioint_disabled(struct kvm_vcpu *vcpu) |
| { |
| return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO); |
| } |
| |
| static int psw_mchk_disabled(struct kvm_vcpu *vcpu) |
| { |
| return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK); |
| } |
| |
| static int psw_interrupts_disabled(struct kvm_vcpu *vcpu) |
| { |
| return psw_extint_disabled(vcpu) && |
| psw_ioint_disabled(vcpu) && |
| psw_mchk_disabled(vcpu); |
| } |
| |
| static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu) |
| { |
| if (psw_extint_disabled(vcpu) || |
| !(vcpu->arch.sie_block->gcr[0] & 0x800ul)) |
| return 0; |
| if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu)) |
| /* No timer interrupts when single stepping */ |
| return 0; |
| return 1; |
| } |
| |
| static int ckc_irq_pending(struct kvm_vcpu *vcpu) |
| { |
| if (vcpu->arch.sie_block->ckc >= kvm_s390_get_tod_clock_fast(vcpu->kvm)) |
| return 0; |
| return ckc_interrupts_enabled(vcpu); |
| } |
| |
| static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu) |
| { |
| return !psw_extint_disabled(vcpu) && |
| (vcpu->arch.sie_block->gcr[0] & 0x400ul); |
| } |
| |
| static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu) |
| { |
| return (vcpu->arch.sie_block->cputm >> 63) && |
| cpu_timer_interrupts_enabled(vcpu); |
| } |
| |
| static inline int is_ioirq(unsigned long irq_type) |
| { |
| return ((irq_type >= IRQ_PEND_IO_ISC_0) && |
| (irq_type <= IRQ_PEND_IO_ISC_7)); |
| } |
| |
| static uint64_t isc_to_isc_bits(int isc) |
| { |
| return (0x80 >> isc) << 24; |
| } |
| |
| static inline u8 int_word_to_isc(u32 int_word) |
| { |
| return (int_word & 0x38000000) >> 27; |
| } |
| |
| static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu) |
| { |
| return vcpu->kvm->arch.float_int.pending_irqs | |
| vcpu->arch.local_int.pending_irqs; |
| } |
| |
| static unsigned long disable_iscs(struct kvm_vcpu *vcpu, |
| unsigned long active_mask) |
| { |
| int i; |
| |
| for (i = 0; i <= MAX_ISC; i++) |
| if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i))) |
| active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i)); |
| |
| return active_mask; |
| } |
| |
| static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu) |
| { |
| unsigned long active_mask; |
| |
| active_mask = pending_irqs(vcpu); |
| if (!active_mask) |
| return 0; |
| |
| if (psw_extint_disabled(vcpu)) |
| active_mask &= ~IRQ_PEND_EXT_MASK; |
| if (psw_ioint_disabled(vcpu)) |
| active_mask &= ~IRQ_PEND_IO_MASK; |
| else |
| active_mask = disable_iscs(vcpu, active_mask); |
| if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul)) |
| __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask); |
| if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul)) |
| __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask); |
| if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul)) |
| __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask); |
| if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul)) |
| __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask); |
| if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul)) |
| __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask); |
| if (psw_mchk_disabled(vcpu)) |
| active_mask &= ~IRQ_PEND_MCHK_MASK; |
| if (!(vcpu->arch.sie_block->gcr[14] & |
| vcpu->kvm->arch.float_int.mchk.cr14)) |
| __clear_bit(IRQ_PEND_MCHK_REP, &active_mask); |
| |
| /* |
| * STOP irqs will never be actively delivered. They are triggered via |
| * intercept requests and cleared when the stop intercept is performed. |
| */ |
| __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask); |
| |
| return active_mask; |
| } |
| |
| static void __set_cpu_idle(struct kvm_vcpu *vcpu) |
| { |
| atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags); |
| set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask); |
| } |
| |
| static void __unset_cpu_idle(struct kvm_vcpu *vcpu) |
| { |
| atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags); |
| clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask); |
| } |
| |
| static void __reset_intercept_indicators(struct kvm_vcpu *vcpu) |
| { |
| atomic_andnot(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT, |
| &vcpu->arch.sie_block->cpuflags); |
| vcpu->arch.sie_block->lctl = 0x0000; |
| vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT); |
| |
| if (guestdbg_enabled(vcpu)) { |
| vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 | |
| LCTL_CR10 | LCTL_CR11); |
| vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT); |
| } |
| } |
| |
| static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag) |
| { |
| atomic_or(flag, &vcpu->arch.sie_block->cpuflags); |
| } |
| |
| static void set_intercept_indicators_io(struct kvm_vcpu *vcpu) |
| { |
| if (!(pending_irqs(vcpu) & IRQ_PEND_IO_MASK)) |
| return; |
| else if (psw_ioint_disabled(vcpu)) |
| __set_cpuflag(vcpu, CPUSTAT_IO_INT); |
| else |
| vcpu->arch.sie_block->lctl |= LCTL_CR6; |
| } |
| |
| static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu) |
| { |
| if (!(pending_irqs(vcpu) & IRQ_PEND_EXT_MASK)) |
| return; |
| if (psw_extint_disabled(vcpu)) |
| __set_cpuflag(vcpu, CPUSTAT_EXT_INT); |
| else |
| vcpu->arch.sie_block->lctl |= LCTL_CR0; |
| } |
| |
| static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu) |
| { |
| if (!(pending_irqs(vcpu) & IRQ_PEND_MCHK_MASK)) |
| return; |
| if (psw_mchk_disabled(vcpu)) |
| vcpu->arch.sie_block->ictl |= ICTL_LPSW; |
| else |
| vcpu->arch.sie_block->lctl |= LCTL_CR14; |
| } |
| |
| static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu) |
| { |
| if (kvm_s390_is_stop_irq_pending(vcpu)) |
| __set_cpuflag(vcpu, CPUSTAT_STOP_INT); |
| } |
| |
| /* Set interception request for non-deliverable interrupts */ |
| static void set_intercept_indicators(struct kvm_vcpu *vcpu) |
| { |
| set_intercept_indicators_io(vcpu); |
| set_intercept_indicators_ext(vcpu); |
| set_intercept_indicators_mchk(vcpu); |
| set_intercept_indicators_stop(vcpu); |
| } |
| |
| static u16 get_ilc(struct kvm_vcpu *vcpu) |
| { |
| switch (vcpu->arch.sie_block->icptcode) { |
| case ICPT_INST: |
| case ICPT_INSTPROGI: |
| case ICPT_OPEREXC: |
| case ICPT_PARTEXEC: |
| case ICPT_IOINST: |
| /* last instruction only stored for these icptcodes */ |
| return insn_length(vcpu->arch.sie_block->ipa >> 8); |
| case ICPT_PROGI: |
| return vcpu->arch.sie_block->pgmilc; |
| default: |
| return 0; |
| } |
| } |
| |
| static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| int rc; |
| |
| trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER, |
| 0, 0); |
| |
| rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER, |
| (u16 *)__LC_EXT_INT_CODE); |
| rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR); |
| rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, |
| &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); |
| rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, |
| &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); |
| clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs); |
| return rc ? -EFAULT : 0; |
| } |
| |
| static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| int rc; |
| |
| trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP, |
| 0, 0); |
| |
| rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP, |
| (u16 __user *)__LC_EXT_INT_CODE); |
| rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR); |
| rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, |
| &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); |
| rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, |
| &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); |
| clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs); |
| return rc ? -EFAULT : 0; |
| } |
| |
| static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| struct kvm_s390_ext_info ext; |
| int rc; |
| |
| spin_lock(&li->lock); |
| ext = li->irq.ext; |
| clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs); |
| li->irq.ext.ext_params2 = 0; |
| spin_unlock(&li->lock); |
| |
| VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx", |
| ext.ext_params2); |
| trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, |
| KVM_S390_INT_PFAULT_INIT, |
| 0, ext.ext_params2); |
| |
| rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE); |
| rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR); |
| rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, |
| &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); |
| rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, |
| &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); |
| rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2); |
| return rc ? -EFAULT : 0; |
| } |
| |
| static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| struct kvm_s390_mchk_info mchk = {}; |
| unsigned long adtl_status_addr; |
| int deliver = 0; |
| int rc = 0; |
| |
| spin_lock(&fi->lock); |
| spin_lock(&li->lock); |
| if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) || |
| test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) { |
| /* |
| * If there was an exigent machine check pending, then any |
| * repressible machine checks that might have been pending |
| * are indicated along with it, so always clear bits for |
| * repressible and exigent interrupts |
| */ |
| mchk = li->irq.mchk; |
| clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs); |
| clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs); |
| memset(&li->irq.mchk, 0, sizeof(mchk)); |
| deliver = 1; |
| } |
| /* |
| * We indicate floating repressible conditions along with |
| * other pending conditions. Channel Report Pending and Channel |
| * Subsystem damage are the only two and and are indicated by |
| * bits in mcic and masked in cr14. |
| */ |
| if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) { |
| mchk.mcic |= fi->mchk.mcic; |
| mchk.cr14 |= fi->mchk.cr14; |
| memset(&fi->mchk, 0, sizeof(mchk)); |
| deliver = 1; |
| } |
| spin_unlock(&li->lock); |
| spin_unlock(&fi->lock); |
| |
| if (deliver) { |
| VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx", |
| mchk.mcic); |
| trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, |
| KVM_S390_MCHK, |
| mchk.cr14, mchk.mcic); |
| |
| rc = kvm_s390_vcpu_store_status(vcpu, |
| KVM_S390_STORE_STATUS_PREFIXED); |
| rc |= read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR, |
| &adtl_status_addr, |
| sizeof(unsigned long)); |
| rc |= kvm_s390_vcpu_store_adtl_status(vcpu, |
| adtl_status_addr); |
| rc |= put_guest_lc(vcpu, mchk.mcic, |
| (u64 __user *) __LC_MCCK_CODE); |
| rc |= put_guest_lc(vcpu, mchk.failing_storage_address, |
| (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR); |
| rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA, |
| &mchk.fixed_logout, |
| sizeof(mchk.fixed_logout)); |
| rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW, |
| &vcpu->arch.sie_block->gpsw, |
| sizeof(psw_t)); |
| rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW, |
| &vcpu->arch.sie_block->gpsw, |
| sizeof(psw_t)); |
| } |
| return rc ? -EFAULT : 0; |
| } |
| |
| static int __must_check __deliver_restart(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| int rc; |
| |
| VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart"); |
| vcpu->stat.deliver_restart_signal++; |
| trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0); |
| |
| rc = write_guest_lc(vcpu, |
| offsetof(struct _lowcore, restart_old_psw), |
| &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); |
| rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw), |
| &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); |
| clear_bit(IRQ_PEND_RESTART, &li->pending_irqs); |
| return rc ? -EFAULT : 0; |
| } |
| |
| static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| struct kvm_s390_prefix_info prefix; |
| |
| spin_lock(&li->lock); |
| prefix = li->irq.prefix; |
| li->irq.prefix.address = 0; |
| clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs); |
| spin_unlock(&li->lock); |
| |
| vcpu->stat.deliver_prefix_signal++; |
| trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, |
| KVM_S390_SIGP_SET_PREFIX, |
| prefix.address, 0); |
| |
| kvm_s390_set_prefix(vcpu, prefix.address); |
| return 0; |
| } |
| |
| static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| int rc; |
| int cpu_addr; |
| |
| spin_lock(&li->lock); |
| cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS); |
| clear_bit(cpu_addr, li->sigp_emerg_pending); |
| if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS)) |
| clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs); |
| spin_unlock(&li->lock); |
| |
| VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg"); |
| vcpu->stat.deliver_emergency_signal++; |
| trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY, |
| cpu_addr, 0); |
| |
| rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG, |
| (u16 *)__LC_EXT_INT_CODE); |
| rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR); |
| rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, |
| &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); |
| rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, |
| &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); |
| return rc ? -EFAULT : 0; |
| } |
| |
| static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| struct kvm_s390_extcall_info extcall; |
| int rc; |
| |
| spin_lock(&li->lock); |
| extcall = li->irq.extcall; |
| li->irq.extcall.code = 0; |
| clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs); |
| spin_unlock(&li->lock); |
| |
| VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call"); |
| vcpu->stat.deliver_external_call++; |
| trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, |
| KVM_S390_INT_EXTERNAL_CALL, |
| extcall.code, 0); |
| |
| rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL, |
| (u16 *)__LC_EXT_INT_CODE); |
| rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR); |
| rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, |
| &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); |
| rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw, |
| sizeof(psw_t)); |
| return rc ? -EFAULT : 0; |
| } |
| |
| static int __must_check __deliver_prog(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| struct kvm_s390_pgm_info pgm_info; |
| int rc = 0, nullifying = false; |
| u16 ilc = get_ilc(vcpu); |
| |
| spin_lock(&li->lock); |
| pgm_info = li->irq.pgm; |
| clear_bit(IRQ_PEND_PROG, &li->pending_irqs); |
| memset(&li->irq.pgm, 0, sizeof(pgm_info)); |
| spin_unlock(&li->lock); |
| |
| VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilc:%d", |
| pgm_info.code, ilc); |
| vcpu->stat.deliver_program_int++; |
| trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT, |
| pgm_info.code, 0); |
| |
| switch (pgm_info.code & ~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: |
| nullifying = true; |
| /* fall through */ |
| case PGM_SPACE_SWITCH: |
| rc = put_guest_lc(vcpu, pgm_info.trans_exc_code, |
| (u64 *)__LC_TRANS_EXC_CODE); |
| 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: |
| rc = put_guest_lc(vcpu, pgm_info.exc_access_id, |
| (u8 *)__LC_EXC_ACCESS_ID); |
| nullifying = true; |
| 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: |
| rc = put_guest_lc(vcpu, pgm_info.trans_exc_code, |
| (u64 *)__LC_TRANS_EXC_CODE); |
| rc |= put_guest_lc(vcpu, pgm_info.exc_access_id, |
| (u8 *)__LC_EXC_ACCESS_ID); |
| rc |= put_guest_lc(vcpu, pgm_info.op_access_id, |
| (u8 *)__LC_OP_ACCESS_ID); |
| nullifying = true; |
| break; |
| case PGM_MONITOR: |
| rc = put_guest_lc(vcpu, pgm_info.mon_class_nr, |
| (u16 *)__LC_MON_CLASS_NR); |
| rc |= put_guest_lc(vcpu, pgm_info.mon_code, |
| (u64 *)__LC_MON_CODE); |
| break; |
| case PGM_VECTOR_PROCESSING: |
| case PGM_DATA: |
| rc = put_guest_lc(vcpu, pgm_info.data_exc_code, |
| (u32 *)__LC_DATA_EXC_CODE); |
| break; |
| case PGM_PROTECTION: |
| rc = put_guest_lc(vcpu, pgm_info.trans_exc_code, |
| (u64 *)__LC_TRANS_EXC_CODE); |
| rc |= put_guest_lc(vcpu, pgm_info.exc_access_id, |
| (u8 *)__LC_EXC_ACCESS_ID); |
| break; |
| case PGM_STACK_FULL: |
| case PGM_STACK_EMPTY: |
| case PGM_STACK_SPECIFICATION: |
| case PGM_STACK_TYPE: |
| case PGM_STACK_OPERATION: |
| case PGM_TRACE_TABEL: |
| case PGM_CRYPTO_OPERATION: |
| nullifying = true; |
| break; |
| } |
| |
| if (pgm_info.code & PGM_PER) { |
| rc |= put_guest_lc(vcpu, pgm_info.per_code, |
| (u8 *) __LC_PER_CODE); |
| rc |= put_guest_lc(vcpu, pgm_info.per_atmid, |
| (u8 *)__LC_PER_ATMID); |
| rc |= put_guest_lc(vcpu, pgm_info.per_address, |
| (u64 *) __LC_PER_ADDRESS); |
| rc |= put_guest_lc(vcpu, pgm_info.per_access_id, |
| (u8 *) __LC_PER_ACCESS_ID); |
| } |
| |
| if (nullifying && vcpu->arch.sie_block->icptcode == ICPT_INST) |
| kvm_s390_rewind_psw(vcpu, ilc); |
| |
| rc |= put_guest_lc(vcpu, ilc, (u16 *) __LC_PGM_ILC); |
| rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea, |
| (u64 *) __LC_LAST_BREAK); |
| rc |= put_guest_lc(vcpu, pgm_info.code, |
| (u16 *)__LC_PGM_INT_CODE); |
| rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW, |
| &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); |
| rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW, |
| &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); |
| return rc ? -EFAULT : 0; |
| } |
| |
| static int __must_check __deliver_service(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; |
| struct kvm_s390_ext_info ext; |
| int rc = 0; |
| |
| spin_lock(&fi->lock); |
| if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) { |
| spin_unlock(&fi->lock); |
| return 0; |
| } |
| ext = fi->srv_signal; |
| memset(&fi->srv_signal, 0, sizeof(ext)); |
| clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs); |
| spin_unlock(&fi->lock); |
| |
| VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x", |
| ext.ext_params); |
| vcpu->stat.deliver_service_signal++; |
| trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE, |
| ext.ext_params, 0); |
| |
| rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE); |
| rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR); |
| rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, |
| &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); |
| rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, |
| &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); |
| rc |= put_guest_lc(vcpu, ext.ext_params, |
| (u32 *)__LC_EXT_PARAMS); |
| |
| return rc ? -EFAULT : 0; |
| } |
| |
| static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; |
| struct kvm_s390_interrupt_info *inti; |
| int rc = 0; |
| |
| spin_lock(&fi->lock); |
| inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT], |
| struct kvm_s390_interrupt_info, |
| list); |
| if (inti) { |
| list_del(&inti->list); |
| fi->counters[FIRQ_CNTR_PFAULT] -= 1; |
| } |
| if (list_empty(&fi->lists[FIRQ_LIST_PFAULT])) |
| clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs); |
| spin_unlock(&fi->lock); |
| |
| if (inti) { |
| trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, |
| KVM_S390_INT_PFAULT_DONE, 0, |
| inti->ext.ext_params2); |
| VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx", |
| inti->ext.ext_params2); |
| |
| rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, |
| (u16 *)__LC_EXT_INT_CODE); |
| rc |= put_guest_lc(vcpu, PFAULT_DONE, |
| (u16 *)__LC_EXT_CPU_ADDR); |
| rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, |
| &vcpu->arch.sie_block->gpsw, |
| sizeof(psw_t)); |
| rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, |
| &vcpu->arch.sie_block->gpsw, |
| sizeof(psw_t)); |
| rc |= put_guest_lc(vcpu, inti->ext.ext_params2, |
| (u64 *)__LC_EXT_PARAMS2); |
| kfree(inti); |
| } |
| return rc ? -EFAULT : 0; |
| } |
| |
| static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; |
| struct kvm_s390_interrupt_info *inti; |
| int rc = 0; |
| |
| spin_lock(&fi->lock); |
| inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO], |
| struct kvm_s390_interrupt_info, |
| list); |
| if (inti) { |
| VCPU_EVENT(vcpu, 4, |
| "deliver: virtio parm: 0x%x,parm64: 0x%llx", |
| inti->ext.ext_params, inti->ext.ext_params2); |
| vcpu->stat.deliver_virtio_interrupt++; |
| trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, |
| inti->type, |
| inti->ext.ext_params, |
| inti->ext.ext_params2); |
| list_del(&inti->list); |
| fi->counters[FIRQ_CNTR_VIRTIO] -= 1; |
| } |
| if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO])) |
| clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs); |
| spin_unlock(&fi->lock); |
| |
| if (inti) { |
| rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, |
| (u16 *)__LC_EXT_INT_CODE); |
| rc |= put_guest_lc(vcpu, VIRTIO_PARAM, |
| (u16 *)__LC_EXT_CPU_ADDR); |
| rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, |
| &vcpu->arch.sie_block->gpsw, |
| sizeof(psw_t)); |
| rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, |
| &vcpu->arch.sie_block->gpsw, |
| sizeof(psw_t)); |
| rc |= put_guest_lc(vcpu, inti->ext.ext_params, |
| (u32 *)__LC_EXT_PARAMS); |
| rc |= put_guest_lc(vcpu, inti->ext.ext_params2, |
| (u64 *)__LC_EXT_PARAMS2); |
| kfree(inti); |
| } |
| return rc ? -EFAULT : 0; |
| } |
| |
| static int __must_check __deliver_io(struct kvm_vcpu *vcpu, |
| unsigned long irq_type) |
| { |
| struct list_head *isc_list; |
| struct kvm_s390_float_interrupt *fi; |
| struct kvm_s390_interrupt_info *inti = NULL; |
| int rc = 0; |
| |
| fi = &vcpu->kvm->arch.float_int; |
| |
| spin_lock(&fi->lock); |
| isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0]; |
| inti = list_first_entry_or_null(isc_list, |
| struct kvm_s390_interrupt_info, |
| list); |
| if (inti) { |
| VCPU_EVENT(vcpu, 4, "deliver: I/O 0x%llx", inti->type); |
| vcpu->stat.deliver_io_int++; |
| trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, |
| inti->type, |
| ((__u32)inti->io.subchannel_id << 16) | |
| inti->io.subchannel_nr, |
| ((__u64)inti->io.io_int_parm << 32) | |
| inti->io.io_int_word); |
| list_del(&inti->list); |
| fi->counters[FIRQ_CNTR_IO] -= 1; |
| } |
| if (list_empty(isc_list)) |
| clear_bit(irq_type, &fi->pending_irqs); |
| spin_unlock(&fi->lock); |
| |
| if (inti) { |
| rc = put_guest_lc(vcpu, inti->io.subchannel_id, |
| (u16 *)__LC_SUBCHANNEL_ID); |
| rc |= put_guest_lc(vcpu, inti->io.subchannel_nr, |
| (u16 *)__LC_SUBCHANNEL_NR); |
| rc |= put_guest_lc(vcpu, inti->io.io_int_parm, |
| (u32 *)__LC_IO_INT_PARM); |
| rc |= put_guest_lc(vcpu, inti->io.io_int_word, |
| (u32 *)__LC_IO_INT_WORD); |
| rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW, |
| &vcpu->arch.sie_block->gpsw, |
| sizeof(psw_t)); |
| rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW, |
| &vcpu->arch.sie_block->gpsw, |
| sizeof(psw_t)); |
| kfree(inti); |
| } |
| |
| return rc ? -EFAULT : 0; |
| } |
| |
| typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu); |
| |
| static const deliver_irq_t deliver_irq_funcs[] = { |
| [IRQ_PEND_MCHK_EX] = __deliver_machine_check, |
| [IRQ_PEND_MCHK_REP] = __deliver_machine_check, |
| [IRQ_PEND_PROG] = __deliver_prog, |
| [IRQ_PEND_EXT_EMERGENCY] = __deliver_emergency_signal, |
| [IRQ_PEND_EXT_EXTERNAL] = __deliver_external_call, |
| [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc, |
| [IRQ_PEND_EXT_CPU_TIMER] = __deliver_cpu_timer, |
| [IRQ_PEND_RESTART] = __deliver_restart, |
| [IRQ_PEND_SET_PREFIX] = __deliver_set_prefix, |
| [IRQ_PEND_PFAULT_INIT] = __deliver_pfault_init, |
| [IRQ_PEND_EXT_SERVICE] = __deliver_service, |
| [IRQ_PEND_PFAULT_DONE] = __deliver_pfault_done, |
| [IRQ_PEND_VIRTIO] = __deliver_virtio, |
| }; |
| |
| /* Check whether an external call is pending (deliverable or not) */ |
| int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| |
| if (!sclp.has_sigpif) |
| return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs); |
| |
| return sca_ext_call_pending(vcpu, NULL); |
| } |
| |
| int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop) |
| { |
| if (deliverable_irqs(vcpu)) |
| return 1; |
| |
| if (kvm_cpu_has_pending_timer(vcpu)) |
| return 1; |
| |
| /* external call pending and deliverable */ |
| if (kvm_s390_ext_call_pending(vcpu) && |
| !psw_extint_disabled(vcpu) && |
| (vcpu->arch.sie_block->gcr[0] & 0x2000ul)) |
| return 1; |
| |
| if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu)) |
| return 1; |
| return 0; |
| } |
| |
| int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) |
| { |
| return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu); |
| } |
| |
| int kvm_s390_handle_wait(struct kvm_vcpu *vcpu) |
| { |
| u64 now, sltime; |
| |
| vcpu->stat.exit_wait_state++; |
| |
| /* fast path */ |
| if (kvm_arch_vcpu_runnable(vcpu)) |
| return 0; |
| |
| if (psw_interrupts_disabled(vcpu)) { |
| VCPU_EVENT(vcpu, 3, "%s", "disabled wait"); |
| return -EOPNOTSUPP; /* disabled wait */ |
| } |
| |
| if (!ckc_interrupts_enabled(vcpu)) { |
| VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer"); |
| __set_cpu_idle(vcpu); |
| goto no_timer; |
| } |
| |
| now = kvm_s390_get_tod_clock_fast(vcpu->kvm); |
| sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now); |
| |
| /* underflow */ |
| if (vcpu->arch.sie_block->ckc < now) |
| return 0; |
| |
| __set_cpu_idle(vcpu); |
| hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL); |
| VCPU_EVENT(vcpu, 4, "enabled wait via clock comparator: %llu ns", sltime); |
| no_timer: |
| srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); |
| kvm_vcpu_block(vcpu); |
| __unset_cpu_idle(vcpu); |
| vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); |
| |
| hrtimer_cancel(&vcpu->arch.ckc_timer); |
| return 0; |
| } |
| |
| void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu) |
| { |
| if (waitqueue_active(&vcpu->wq)) { |
| /* |
| * The vcpu gave up the cpu voluntarily, mark it as a good |
| * yield-candidate. |
| */ |
| vcpu->preempted = true; |
| wake_up_interruptible(&vcpu->wq); |
| vcpu->stat.halt_wakeup++; |
| } |
| } |
| |
| enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer) |
| { |
| struct kvm_vcpu *vcpu; |
| u64 now, sltime; |
| |
| vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer); |
| now = kvm_s390_get_tod_clock_fast(vcpu->kvm); |
| sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now); |
| |
| /* |
| * If the monotonic clock runs faster than the tod clock we might be |
| * woken up too early and have to go back to sleep to avoid deadlocks. |
| */ |
| if (vcpu->arch.sie_block->ckc > now && |
| hrtimer_forward_now(timer, ns_to_ktime(sltime))) |
| return HRTIMER_RESTART; |
| kvm_s390_vcpu_wakeup(vcpu); |
| return HRTIMER_NORESTART; |
| } |
| |
| void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| |
| spin_lock(&li->lock); |
| li->pending_irqs = 0; |
| bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS); |
| memset(&li->irq, 0, sizeof(li->irq)); |
| spin_unlock(&li->lock); |
| |
| sca_clear_ext_call(vcpu); |
| } |
| |
| int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| deliver_irq_t func; |
| int rc = 0; |
| unsigned long irq_type; |
| unsigned long irqs; |
| |
| __reset_intercept_indicators(vcpu); |
| |
| /* pending ckc conditions might have been invalidated */ |
| clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs); |
| if (ckc_irq_pending(vcpu)) |
| set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs); |
| |
| /* pending cpu timer conditions might have been invalidated */ |
| clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs); |
| if (cpu_timer_irq_pending(vcpu)) |
| set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs); |
| |
| while ((irqs = deliverable_irqs(vcpu)) && !rc) { |
| /* bits are in the order of interrupt priority */ |
| irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT); |
| if (is_ioirq(irq_type)) { |
| rc = __deliver_io(vcpu, irq_type); |
| } else { |
| func = deliver_irq_funcs[irq_type]; |
| if (!func) { |
| WARN_ON_ONCE(func == NULL); |
| clear_bit(irq_type, &li->pending_irqs); |
| continue; |
| } |
| rc = func(vcpu); |
| } |
| } |
| |
| set_intercept_indicators(vcpu); |
| |
| return rc; |
| } |
| |
| static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| |
| VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code); |
| trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT, |
| irq->u.pgm.code, 0); |
| |
| if (irq->u.pgm.code == PGM_PER) { |
| li->irq.pgm.code |= PGM_PER; |
| /* only modify PER related information */ |
| li->irq.pgm.per_address = irq->u.pgm.per_address; |
| li->irq.pgm.per_code = irq->u.pgm.per_code; |
| li->irq.pgm.per_atmid = irq->u.pgm.per_atmid; |
| li->irq.pgm.per_access_id = irq->u.pgm.per_access_id; |
| } else if (!(irq->u.pgm.code & PGM_PER)) { |
| li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) | |
| irq->u.pgm.code; |
| /* only modify non-PER information */ |
| li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code; |
| li->irq.pgm.mon_code = irq->u.pgm.mon_code; |
| li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code; |
| li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr; |
| li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id; |
| li->irq.pgm.op_access_id = irq->u.pgm.op_access_id; |
| } else { |
| li->irq.pgm = irq->u.pgm; |
| } |
| set_bit(IRQ_PEND_PROG, &li->pending_irqs); |
| return 0; |
| } |
| |
| static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| |
| VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx", |
| irq->u.ext.ext_params2); |
| trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT, |
| irq->u.ext.ext_params, |
| irq->u.ext.ext_params2); |
| |
| li->irq.ext = irq->u.ext; |
| set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs); |
| atomic_or(CPUSTAT_EXT_INT, li->cpuflags); |
| return 0; |
| } |
| |
| static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| struct kvm_s390_extcall_info *extcall = &li->irq.extcall; |
| uint16_t src_id = irq->u.extcall.code; |
| |
| VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u", |
| src_id); |
| trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL, |
| src_id, 0); |
| |
| /* sending vcpu invalid */ |
| if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL) |
| return -EINVAL; |
| |
| if (sclp.has_sigpif) |
| return sca_inject_ext_call(vcpu, src_id); |
| |
| if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs)) |
| return -EBUSY; |
| *extcall = irq->u.extcall; |
| atomic_or(CPUSTAT_EXT_INT, li->cpuflags); |
| return 0; |
| } |
| |
| static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| struct kvm_s390_prefix_info *prefix = &li->irq.prefix; |
| |
| VCPU_EVENT(vcpu, 3, "inject: set prefix to %x", |
| irq->u.prefix.address); |
| trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX, |
| irq->u.prefix.address, 0); |
| |
| if (!is_vcpu_stopped(vcpu)) |
| return -EBUSY; |
| |
| *prefix = irq->u.prefix; |
| set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs); |
| return 0; |
| } |
| |
| #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS) |
| static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| struct kvm_s390_stop_info *stop = &li->irq.stop; |
| int rc = 0; |
| |
| trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0); |
| |
| if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS) |
| return -EINVAL; |
| |
| if (is_vcpu_stopped(vcpu)) { |
| if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS) |
| rc = kvm_s390_store_status_unloaded(vcpu, |
| KVM_S390_STORE_STATUS_NOADDR); |
| return rc; |
| } |
| |
| if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs)) |
| return -EBUSY; |
| stop->flags = irq->u.stop.flags; |
| __set_cpuflag(vcpu, CPUSTAT_STOP_INT); |
| return 0; |
| } |
| |
| static int __inject_sigp_restart(struct kvm_vcpu *vcpu, |
| struct kvm_s390_irq *irq) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| |
| VCPU_EVENT(vcpu, 3, "%s", "inject: restart int"); |
| trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0); |
| |
| set_bit(IRQ_PEND_RESTART, &li->pending_irqs); |
| return 0; |
| } |
| |
| static int __inject_sigp_emergency(struct kvm_vcpu *vcpu, |
| struct kvm_s390_irq *irq) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| |
| VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u", |
| irq->u.emerg.code); |
| trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY, |
| irq->u.emerg.code, 0); |
| |
| /* sending vcpu invalid */ |
| if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL) |
| return -EINVAL; |
| |
| set_bit(irq->u.emerg.code, li->sigp_emerg_pending); |
| set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs); |
| atomic_or(CPUSTAT_EXT_INT, li->cpuflags); |
| return 0; |
| } |
| |
| static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| struct kvm_s390_mchk_info *mchk = &li->irq.mchk; |
| |
| VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx", |
| irq->u.mchk.mcic); |
| trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0, |
| irq->u.mchk.mcic); |
| |
| /* |
| * Because repressible machine checks can be indicated along with |
| * exigent machine checks (PoP, Chapter 11, Interruption action) |
| * we need to combine cr14, mcic and external damage code. |
| * Failing storage address and the logout area should not be or'ed |
| * together, we just indicate the last occurrence of the corresponding |
| * machine check |
| */ |
| mchk->cr14 |= irq->u.mchk.cr14; |
| mchk->mcic |= irq->u.mchk.mcic; |
| mchk->ext_damage_code |= irq->u.mchk.ext_damage_code; |
| mchk->failing_storage_address = irq->u.mchk.failing_storage_address; |
| memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout, |
| sizeof(mchk->fixed_logout)); |
| if (mchk->mcic & MCHK_EX_MASK) |
| set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs); |
| else if (mchk->mcic & MCHK_REP_MASK) |
| set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs); |
| return 0; |
| } |
| |
| static int __inject_ckc(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| |
| VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external"); |
| trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP, |
| 0, 0); |
| |
| set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs); |
| atomic_or(CPUSTAT_EXT_INT, li->cpuflags); |
| return 0; |
| } |
| |
| static int __inject_cpu_timer(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| |
| VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external"); |
| trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER, |
| 0, 0); |
| |
| set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs); |
| atomic_or(CPUSTAT_EXT_INT, li->cpuflags); |
| return 0; |
| } |
| |
| static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm, |
| int isc, u32 schid) |
| { |
| struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; |
| struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc]; |
| struct kvm_s390_interrupt_info *iter; |
| u16 id = (schid & 0xffff0000U) >> 16; |
| u16 nr = schid & 0x0000ffffU; |
| |
| spin_lock(&fi->lock); |
| list_for_each_entry(iter, isc_list, list) { |
| if (schid && (id != iter->io.subchannel_id || |
| nr != iter->io.subchannel_nr)) |
| continue; |
| /* found an appropriate entry */ |
| list_del_init(&iter->list); |
| fi->counters[FIRQ_CNTR_IO] -= 1; |
| if (list_empty(isc_list)) |
| clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs); |
| spin_unlock(&fi->lock); |
| return iter; |
| } |
| spin_unlock(&fi->lock); |
| return NULL; |
| } |
| |
| /* |
| * Dequeue and return an I/O interrupt matching any of the interruption |
| * subclasses as designated by the isc mask in cr6 and the schid (if != 0). |
| */ |
| struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm, |
| u64 isc_mask, u32 schid) |
| { |
| struct kvm_s390_interrupt_info *inti = NULL; |
| int isc; |
| |
| for (isc = 0; isc <= MAX_ISC && !inti; isc++) { |
| if (isc_mask & isc_to_isc_bits(isc)) |
| inti = get_io_int(kvm, isc, schid); |
| } |
| return inti; |
| } |
| |
| #define SCCB_MASK 0xFFFFFFF8 |
| #define SCCB_EVENT_PENDING 0x3 |
| |
| static int __inject_service(struct kvm *kvm, |
| struct kvm_s390_interrupt_info *inti) |
| { |
| struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; |
| |
| spin_lock(&fi->lock); |
| fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING; |
| /* |
| * Early versions of the QEMU s390 bios will inject several |
| * service interrupts after another without handling a |
| * condition code indicating busy. |
| * We will silently ignore those superfluous sccb values. |
| * A future version of QEMU will take care of serialization |
| * of servc requests |
| */ |
| if (fi->srv_signal.ext_params & SCCB_MASK) |
| goto out; |
| fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK; |
| set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs); |
| out: |
| spin_unlock(&fi->lock); |
| kfree(inti); |
| return 0; |
| } |
| |
| static int __inject_virtio(struct kvm *kvm, |
| struct kvm_s390_interrupt_info *inti) |
| { |
| struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; |
| |
| spin_lock(&fi->lock); |
| if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) { |
| spin_unlock(&fi->lock); |
| return -EBUSY; |
| } |
| fi->counters[FIRQ_CNTR_VIRTIO] += 1; |
| list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]); |
| set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs); |
| spin_unlock(&fi->lock); |
| return 0; |
| } |
| |
| static int __inject_pfault_done(struct kvm *kvm, |
| struct kvm_s390_interrupt_info *inti) |
| { |
| struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; |
| |
| spin_lock(&fi->lock); |
| if (fi->counters[FIRQ_CNTR_PFAULT] >= |
| (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) { |
| spin_unlock(&fi->lock); |
| return -EBUSY; |
| } |
| fi->counters[FIRQ_CNTR_PFAULT] += 1; |
| list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]); |
| set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs); |
| spin_unlock(&fi->lock); |
| return 0; |
| } |
| |
| #define CR_PENDING_SUBCLASS 28 |
| static int __inject_float_mchk(struct kvm *kvm, |
| struct kvm_s390_interrupt_info *inti) |
| { |
| struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; |
| |
| spin_lock(&fi->lock); |
| fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS); |
| fi->mchk.mcic |= inti->mchk.mcic; |
| set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs); |
| spin_unlock(&fi->lock); |
| kfree(inti); |
| return 0; |
| } |
| |
| static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti) |
| { |
| struct kvm_s390_float_interrupt *fi; |
| struct list_head *list; |
| int isc; |
| |
| fi = &kvm->arch.float_int; |
| spin_lock(&fi->lock); |
| if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) { |
| spin_unlock(&fi->lock); |
| return -EBUSY; |
| } |
| fi->counters[FIRQ_CNTR_IO] += 1; |
| |
| isc = int_word_to_isc(inti->io.io_int_word); |
| list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc]; |
| list_add_tail(&inti->list, list); |
| set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs); |
| spin_unlock(&fi->lock); |
| return 0; |
| } |
| |
| /* |
| * Find a destination VCPU for a floating irq and kick it. |
| */ |
| static void __floating_irq_kick(struct kvm *kvm, u64 type) |
| { |
| struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; |
| struct kvm_s390_local_interrupt *li; |
| struct kvm_vcpu *dst_vcpu; |
| int sigcpu, online_vcpus, nr_tries = 0; |
| |
| online_vcpus = atomic_read(&kvm->online_vcpus); |
| if (!online_vcpus) |
| return; |
| |
| /* find idle VCPUs first, then round robin */ |
| sigcpu = find_first_bit(fi->idle_mask, online_vcpus); |
| if (sigcpu == online_vcpus) { |
| do { |
| sigcpu = fi->next_rr_cpu; |
| fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus; |
| /* avoid endless loops if all vcpus are stopped */ |
| if (nr_tries++ >= online_vcpus) |
| return; |
| } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu))); |
| } |
| dst_vcpu = kvm_get_vcpu(kvm, sigcpu); |
| |
| /* make the VCPU drop out of the SIE, or wake it up if sleeping */ |
| li = &dst_vcpu->arch.local_int; |
| spin_lock(&li->lock); |
| switch (type) { |
| case KVM_S390_MCHK: |
| atomic_or(CPUSTAT_STOP_INT, li->cpuflags); |
| break; |
| case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: |
| atomic_or(CPUSTAT_IO_INT, li->cpuflags); |
| break; |
| default: |
| atomic_or(CPUSTAT_EXT_INT, li->cpuflags); |
| break; |
| } |
| spin_unlock(&li->lock); |
| kvm_s390_vcpu_wakeup(dst_vcpu); |
| } |
| |
| static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti) |
| { |
| u64 type = READ_ONCE(inti->type); |
| int rc; |
| |
| switch (type) { |
| case KVM_S390_MCHK: |
| rc = __inject_float_mchk(kvm, inti); |
| break; |
| case KVM_S390_INT_VIRTIO: |
| rc = __inject_virtio(kvm, inti); |
| break; |
| case KVM_S390_INT_SERVICE: |
| rc = __inject_service(kvm, inti); |
| break; |
| case KVM_S390_INT_PFAULT_DONE: |
| rc = __inject_pfault_done(kvm, inti); |
| break; |
| case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: |
| rc = __inject_io(kvm, inti); |
| break; |
| default: |
| rc = -EINVAL; |
| } |
| if (rc) |
| return rc; |
| |
| __floating_irq_kick(kvm, type); |
| return 0; |
| } |
| |
| int kvm_s390_inject_vm(struct kvm *kvm, |
| struct kvm_s390_interrupt *s390int) |
| { |
| struct kvm_s390_interrupt_info *inti; |
| int rc; |
| |
| inti = kzalloc(sizeof(*inti), GFP_KERNEL); |
| if (!inti) |
| return -ENOMEM; |
| |
| inti->type = s390int->type; |
| switch (inti->type) { |
| case KVM_S390_INT_VIRTIO: |
| VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx", |
| s390int->parm, s390int->parm64); |
| inti->ext.ext_params = s390int->parm; |
| inti->ext.ext_params2 = s390int->parm64; |
| break; |
| case KVM_S390_INT_SERVICE: |
| VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm); |
| inti->ext.ext_params = s390int->parm; |
| break; |
| case KVM_S390_INT_PFAULT_DONE: |
| inti->ext.ext_params2 = s390int->parm64; |
| break; |
| case KVM_S390_MCHK: |
| VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx", |
| s390int->parm64); |
| inti->mchk.cr14 = s390int->parm; /* upper bits are not used */ |
| inti->mchk.mcic = s390int->parm64; |
| break; |
| case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: |
| if (inti->type & KVM_S390_INT_IO_AI_MASK) |
| VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)"); |
| else |
| VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x", |
| s390int->type & IOINT_CSSID_MASK, |
| s390int->type & IOINT_SSID_MASK, |
| s390int->type & IOINT_SCHID_MASK); |
| inti->io.subchannel_id = s390int->parm >> 16; |
| inti->io.subchannel_nr = s390int->parm & 0x0000ffffu; |
| inti->io.io_int_parm = s390int->parm64 >> 32; |
| inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull; |
| break; |
| default: |
| kfree(inti); |
| return -EINVAL; |
| } |
| trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64, |
| 2); |
| |
| rc = __inject_vm(kvm, inti); |
| if (rc) |
| kfree(inti); |
| return rc; |
| } |
| |
| int kvm_s390_reinject_io_int(struct kvm *kvm, |
| struct kvm_s390_interrupt_info *inti) |
| { |
| return __inject_vm(kvm, inti); |
| } |
| |
| int s390int_to_s390irq(struct kvm_s390_interrupt *s390int, |
| struct kvm_s390_irq *irq) |
| { |
| irq->type = s390int->type; |
| switch (irq->type) { |
| case KVM_S390_PROGRAM_INT: |
| if (s390int->parm & 0xffff0000) |
| return -EINVAL; |
| irq->u.pgm.code = s390int->parm; |
| break; |
| case KVM_S390_SIGP_SET_PREFIX: |
| irq->u.prefix.address = s390int->parm; |
| break; |
| case KVM_S390_SIGP_STOP: |
| irq->u.stop.flags = s390int->parm; |
| break; |
| case KVM_S390_INT_EXTERNAL_CALL: |
| if (s390int->parm & 0xffff0000) |
| return -EINVAL; |
| irq->u.extcall.code = s390int->parm; |
| break; |
| case KVM_S390_INT_EMERGENCY: |
| if (s390int->parm & 0xffff0000) |
| return -EINVAL; |
| irq->u.emerg.code = s390int->parm; |
| break; |
| case KVM_S390_MCHK: |
| irq->u.mchk.mcic = s390int->parm64; |
| break; |
| } |
| return 0; |
| } |
| |
| int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| |
| return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs); |
| } |
| |
| void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| |
| spin_lock(&li->lock); |
| li->irq.stop.flags = 0; |
| clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs); |
| spin_unlock(&li->lock); |
| } |
| |
| static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) |
| { |
| int rc; |
| |
| switch (irq->type) { |
| case KVM_S390_PROGRAM_INT: |
| rc = __inject_prog(vcpu, irq); |
| break; |
| case KVM_S390_SIGP_SET_PREFIX: |
| rc = __inject_set_prefix(vcpu, irq); |
| break; |
| case KVM_S390_SIGP_STOP: |
| rc = __inject_sigp_stop(vcpu, irq); |
| break; |
| case KVM_S390_RESTART: |
| rc = __inject_sigp_restart(vcpu, irq); |
| break; |
| case KVM_S390_INT_CLOCK_COMP: |
| rc = __inject_ckc(vcpu); |
| break; |
| case KVM_S390_INT_CPU_TIMER: |
| rc = __inject_cpu_timer(vcpu); |
| break; |
| case KVM_S390_INT_EXTERNAL_CALL: |
| rc = __inject_extcall(vcpu, irq); |
| break; |
| case KVM_S390_INT_EMERGENCY: |
| rc = __inject_sigp_emergency(vcpu, irq); |
| break; |
| case KVM_S390_MCHK: |
| rc = __inject_mchk(vcpu, irq); |
| break; |
| case KVM_S390_INT_PFAULT_INIT: |
| rc = __inject_pfault_init(vcpu, irq); |
| break; |
| case KVM_S390_INT_VIRTIO: |
| case KVM_S390_INT_SERVICE: |
| case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: |
| default: |
| rc = -EINVAL; |
| } |
| |
| return rc; |
| } |
| |
| int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| int rc; |
| |
| spin_lock(&li->lock); |
| rc = do_inject_vcpu(vcpu, irq); |
| spin_unlock(&li->lock); |
| if (!rc) |
| kvm_s390_vcpu_wakeup(vcpu); |
| return rc; |
| } |
| |
| static inline void clear_irq_list(struct list_head *_list) |
| { |
| struct kvm_s390_interrupt_info *inti, *n; |
| |
| list_for_each_entry_safe(inti, n, _list, list) { |
| list_del(&inti->list); |
| kfree(inti); |
| } |
| } |
| |
| static void inti_to_irq(struct kvm_s390_interrupt_info *inti, |
| struct kvm_s390_irq *irq) |
| { |
| irq->type = inti->type; |
| switch (inti->type) { |
| case KVM_S390_INT_PFAULT_INIT: |
| case KVM_S390_INT_PFAULT_DONE: |
| case KVM_S390_INT_VIRTIO: |
| irq->u.ext = inti->ext; |
| break; |
| case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: |
| irq->u.io = inti->io; |
| break; |
| } |
| } |
| |
| void kvm_s390_clear_float_irqs(struct kvm *kvm) |
| { |
| struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; |
| int i; |
| |
| spin_lock(&fi->lock); |
| fi->pending_irqs = 0; |
| memset(&fi->srv_signal, 0, sizeof(fi->srv_signal)); |
| memset(&fi->mchk, 0, sizeof(fi->mchk)); |
| for (i = 0; i < FIRQ_LIST_COUNT; i++) |
| clear_irq_list(&fi->lists[i]); |
| for (i = 0; i < FIRQ_MAX_COUNT; i++) |
| fi->counters[i] = 0; |
| spin_unlock(&fi->lock); |
| }; |
| |
| static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len) |
| { |
| struct kvm_s390_interrupt_info *inti; |
| struct kvm_s390_float_interrupt *fi; |
| struct kvm_s390_irq *buf; |
| struct kvm_s390_irq *irq; |
| int max_irqs; |
| int ret = 0; |
| int n = 0; |
| int i; |
| |
| if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0) |
| return -EINVAL; |
| |
| /* |
| * We are already using -ENOMEM to signal |
| * userspace it may retry with a bigger buffer, |
| * so we need to use something else for this case |
| */ |
| buf = vzalloc(len); |
| if (!buf) |
| return -ENOBUFS; |
| |
| max_irqs = len / sizeof(struct kvm_s390_irq); |
| |
| fi = &kvm->arch.float_int; |
| spin_lock(&fi->lock); |
| for (i = 0; i < FIRQ_LIST_COUNT; i++) { |
| list_for_each_entry(inti, &fi->lists[i], list) { |
| if (n == max_irqs) { |
| /* signal userspace to try again */ |
| ret = -ENOMEM; |
| goto out; |
| } |
| inti_to_irq(inti, &buf[n]); |
| n++; |
| } |
| } |
| if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) { |
| if (n == max_irqs) { |
| /* signal userspace to try again */ |
| ret = -ENOMEM; |
| goto out; |
| } |
| irq = (struct kvm_s390_irq *) &buf[n]; |
| irq->type = KVM_S390_INT_SERVICE; |
| irq->u.ext = fi->srv_signal; |
| n++; |
| } |
| if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) { |
| if (n == max_irqs) { |
| /* signal userspace to try again */ |
| ret = -ENOMEM; |
| goto out; |
| } |
| irq = (struct kvm_s390_irq *) &buf[n]; |
| irq->type = KVM_S390_MCHK; |
| irq->u.mchk = fi->mchk; |
| n++; |
| } |
| |
| out: |
| spin_unlock(&fi->lock); |
| if (!ret && n > 0) { |
| if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n)) |
| ret = -EFAULT; |
| } |
| vfree(buf); |
| |
| return ret < 0 ? ret : n; |
| } |
| |
| static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr) |
| { |
| int r; |
| |
| switch (attr->group) { |
| case KVM_DEV_FLIC_GET_ALL_IRQS: |
| r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr, |
| attr->attr); |
| break; |
| default: |
| r = -EINVAL; |
| } |
| |
| return r; |
| } |
| |
| static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti, |
| u64 addr) |
| { |
| struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr; |
| void *target = NULL; |
| void __user *source; |
| u64 size; |
| |
| if (get_user(inti->type, (u64 __user *)addr)) |
| return -EFAULT; |
| |
| switch (inti->type) { |
| case KVM_S390_INT_PFAULT_INIT: |
| case KVM_S390_INT_PFAULT_DONE: |
| case KVM_S390_INT_VIRTIO: |
| case KVM_S390_INT_SERVICE: |
| target = (void *) &inti->ext; |
| source = &uptr->u.ext; |
| size = sizeof(inti->ext); |
| break; |
| case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: |
| target = (void *) &inti->io; |
| source = &uptr->u.io; |
| size = sizeof(inti->io); |
| break; |
| case KVM_S390_MCHK: |
| target = (void *) &inti->mchk; |
| source = &uptr->u.mchk; |
| size = sizeof(inti->mchk); |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| if (copy_from_user(target, source, size)) |
| return -EFAULT; |
| |
| return 0; |
| } |
| |
| static int enqueue_floating_irq(struct kvm_device *dev, |
| struct kvm_device_attr *attr) |
| { |
| struct kvm_s390_interrupt_info *inti = NULL; |
| int r = 0; |
| int len = attr->attr; |
| |
| if (len % sizeof(struct kvm_s390_irq) != 0) |
| return -EINVAL; |
| else if (len > KVM_S390_FLIC_MAX_BUFFER) |
| return -EINVAL; |
| |
| while (len >= sizeof(struct kvm_s390_irq)) { |
| inti = kzalloc(sizeof(*inti), GFP_KERNEL); |
| if (!inti) |
| return -ENOMEM; |
| |
| r = copy_irq_from_user(inti, attr->addr); |
| if (r) { |
| kfree(inti); |
| return r; |
| } |
| r = __inject_vm(dev->kvm, inti); |
| if (r) { |
| kfree(inti); |
| return r; |
| } |
| len -= sizeof(struct kvm_s390_irq); |
| attr->addr += sizeof(struct kvm_s390_irq); |
| } |
| |
| return r; |
| } |
| |
| static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id) |
| { |
| if (id >= MAX_S390_IO_ADAPTERS) |
| return NULL; |
| return kvm->arch.adapters[id]; |
| } |
| |
| static int register_io_adapter(struct kvm_device *dev, |
| struct kvm_device_attr *attr) |
| { |
| struct s390_io_adapter *adapter; |
| struct kvm_s390_io_adapter adapter_info; |
| |
| if (copy_from_user(&adapter_info, |
| (void __user *)attr->addr, sizeof(adapter_info))) |
| return -EFAULT; |
| |
| if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) || |
| (dev->kvm->arch.adapters[adapter_info.id] != NULL)) |
| return -EINVAL; |
| |
| adapter = kzalloc(sizeof(*adapter), GFP_KERNEL); |
| if (!adapter) |
| return -ENOMEM; |
| |
| INIT_LIST_HEAD(&adapter->maps); |
| init_rwsem(&adapter->maps_lock); |
| atomic_set(&adapter->nr_maps, 0); |
| adapter->id = adapter_info.id; |
| adapter->isc = adapter_info.isc; |
| adapter->maskable = adapter_info.maskable; |
| adapter->masked = false; |
| adapter->swap = adapter_info.swap; |
| dev->kvm->arch.adapters[adapter->id] = adapter; |
| |
| return 0; |
| } |
| |
| int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked) |
| { |
| int ret; |
| struct s390_io_adapter *adapter = get_io_adapter(kvm, id); |
| |
| if (!adapter || !adapter->maskable) |
| return -EINVAL; |
| ret = adapter->masked; |
| adapter->masked = masked; |
| return ret; |
| } |
| |
| static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr) |
| { |
| struct s390_io_adapter *adapter = get_io_adapter(kvm, id); |
| struct s390_map_info *map; |
| int ret; |
| |
| if (!adapter || !addr) |
| return -EINVAL; |
| |
| map = kzalloc(sizeof(*map), GFP_KERNEL); |
| if (!map) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| INIT_LIST_HEAD(&map->list); |
| map->guest_addr = addr; |
| map->addr = gmap_translate(kvm->arch.gmap, addr); |
| if (map->addr == -EFAULT) { |
| ret = -EFAULT; |
| goto out; |
| } |
| ret = get_user_pages_fast(map->addr, 1, 1, &map->page); |
| if (ret < 0) |
| goto out; |
| BUG_ON(ret != 1); |
| down_write(&adapter->maps_lock); |
| if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) { |
| list_add_tail(&map->list, &adapter->maps); |
| ret = 0; |
| } else { |
| put_page(map->page); |
| ret = -EINVAL; |
| } |
| up_write(&adapter->maps_lock); |
| out: |
| if (ret) |
| kfree(map); |
| return ret; |
| } |
| |
| static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr) |
| { |
| struct s390_io_adapter *adapter = get_io_adapter(kvm, id); |
| struct s390_map_info *map, *tmp; |
| int found = 0; |
| |
| if (!adapter || !addr) |
| return -EINVAL; |
| |
| down_write(&adapter->maps_lock); |
| list_for_each_entry_safe(map, tmp, &adapter->maps, list) { |
| if (map->guest_addr == addr) { |
| found = 1; |
| atomic_dec(&adapter->nr_maps); |
| list_del(&map->list); |
| put_page(map->page); |
| kfree(map); |
| break; |
| } |
| } |
| up_write(&adapter->maps_lock); |
| |
| return found ? 0 : -EINVAL; |
| } |
| |
| void kvm_s390_destroy_adapters(struct kvm *kvm) |
| { |
| int i; |
| struct s390_map_info *map, *tmp; |
| |
| for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) { |
| if (!kvm->arch.adapters[i]) |
| continue; |
| list_for_each_entry_safe(map, tmp, |
| &kvm->arch.adapters[i]->maps, list) { |
| list_del(&map->list); |
| put_page(map->page); |
| kfree(map); |
| } |
| kfree(kvm->arch.adapters[i]); |
| } |
| } |
| |
| static int modify_io_adapter(struct kvm_device *dev, |
| struct kvm_device_attr *attr) |
| { |
| struct kvm_s390_io_adapter_req req; |
| struct s390_io_adapter *adapter; |
| int ret; |
| |
| if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req))) |
| return -EFAULT; |
| |
| adapter = get_io_adapter(dev->kvm, req.id); |
| if (!adapter) |
| return -EINVAL; |
| switch (req.type) { |
| case KVM_S390_IO_ADAPTER_MASK: |
| ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask); |
| if (ret > 0) |
| ret = 0; |
| break; |
| case KVM_S390_IO_ADAPTER_MAP: |
| ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr); |
| break; |
| case KVM_S390_IO_ADAPTER_UNMAP: |
| ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr); |
| break; |
| default: |
| ret = -EINVAL; |
| } |
| |
| return ret; |
| } |
| |
| static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr) |
| { |
| int r = 0; |
| unsigned int i; |
| struct kvm_vcpu *vcpu; |
| |
| switch (attr->group) { |
| case KVM_DEV_FLIC_ENQUEUE: |
| r = enqueue_floating_irq(dev, attr); |
| break; |
| case KVM_DEV_FLIC_CLEAR_IRQS: |
| kvm_s390_clear_float_irqs(dev->kvm); |
| break; |
| case KVM_DEV_FLIC_APF_ENABLE: |
| dev->kvm->arch.gmap->pfault_enabled = 1; |
| break; |
| case KVM_DEV_FLIC_APF_DISABLE_WAIT: |
| dev->kvm->arch.gmap->pfault_enabled = 0; |
| /* |
| * Make sure no async faults are in transition when |
| * clearing the queues. So we don't need to worry |
| * about late coming workers. |
| */ |
| synchronize_srcu(&dev->kvm->srcu); |
| kvm_for_each_vcpu(i, vcpu, dev->kvm) |
| kvm_clear_async_pf_completion_queue(vcpu); |
| break; |
| case KVM_DEV_FLIC_ADAPTER_REGISTER: |
| r = register_io_adapter(dev, attr); |
| break; |
| case KVM_DEV_FLIC_ADAPTER_MODIFY: |
| r = modify_io_adapter(dev, attr); |
| break; |
| default: |
| r = -EINVAL; |
| } |
| |
| return r; |
| } |
| |
| static int flic_create(struct kvm_device *dev, u32 type) |
| { |
| if (!dev) |
| return -EINVAL; |
| if (dev->kvm->arch.flic) |
| return -EINVAL; |
| dev->kvm->arch.flic = dev; |
| return 0; |
| } |
| |
| static void flic_destroy(struct kvm_device *dev) |
| { |
| dev->kvm->arch.flic = NULL; |
| kfree(dev); |
| } |
| |
| /* s390 floating irq controller (flic) */ |
| struct kvm_device_ops kvm_flic_ops = { |
| .name = "kvm-flic", |
| .get_attr = flic_get_attr, |
| .set_attr = flic_set_attr, |
| .create = flic_create, |
| .destroy = flic_destroy, |
| }; |
| |
| static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap) |
| { |
| unsigned long bit; |
| |
| bit = bit_nr + (addr % PAGE_SIZE) * 8; |
| |
| return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit; |
| } |
| |
| static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter, |
| u64 addr) |
| { |
| struct s390_map_info *map; |
| |
| if (!adapter) |
| return NULL; |
| |
| list_for_each_entry(map, &adapter->maps, list) { |
| if (map->guest_addr == addr) |
| return map; |
| } |
| return NULL; |
| } |
| |
| static int adapter_indicators_set(struct kvm *kvm, |
| struct s390_io_adapter *adapter, |
| struct kvm_s390_adapter_int *adapter_int) |
| { |
| unsigned long bit; |
| int summary_set, idx; |
| struct s390_map_info *info; |
| void *map; |
| |
| info = get_map_info(adapter, adapter_int->ind_addr); |
| if (!info) |
| return -1; |
| map = page_address(info->page); |
| bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap); |
| set_bit(bit, map); |
| idx = srcu_read_lock(&kvm->srcu); |
| mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT); |
| set_page_dirty_lock(info->page); |
| info = get_map_info(adapter, adapter_int->summary_addr); |
| if (!info) { |
| srcu_read_unlock(&kvm->srcu, idx); |
| return -1; |
| } |
| map = page_address(info->page); |
| bit = get_ind_bit(info->addr, adapter_int->summary_offset, |
| adapter->swap); |
| summary_set = test_and_set_bit(bit, map); |
| mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT); |
| set_page_dirty_lock(info->page); |
| srcu_read_unlock(&kvm->srcu, idx); |
| return summary_set ? 0 : 1; |
| } |
| |
| /* |
| * < 0 - not injected due to error |
| * = 0 - coalesced, summary indicator already active |
| * > 0 - injected interrupt |
| */ |
| static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e, |
| struct kvm *kvm, int irq_source_id, int level, |
| bool line_status) |
| { |
| int ret; |
| struct s390_io_adapter *adapter; |
| |
| /* We're only interested in the 0->1 transition. */ |
| if (!level) |
| return 0; |
| adapter = get_io_adapter(kvm, e->adapter.adapter_id); |
| if (!adapter) |
| return -1; |
| down_read(&adapter->maps_lock); |
| ret = adapter_indicators_set(kvm, adapter, &e->adapter); |
| up_read(&adapter->maps_lock); |
| if ((ret > 0) && !adapter->masked) { |
| struct kvm_s390_interrupt s390int = { |
| .type = KVM_S390_INT_IO(1, 0, 0, 0), |
| .parm = 0, |
| .parm64 = (adapter->isc << 27) | 0x80000000, |
| }; |
| ret = kvm_s390_inject_vm(kvm, &s390int); |
| if (ret == 0) |
| ret = 1; |
| } |
| return ret; |
| } |
| |
| int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e, |
| const struct kvm_irq_routing_entry *ue) |
| { |
| int ret; |
| |
| switch (ue->type) { |
| case KVM_IRQ_ROUTING_S390_ADAPTER: |
| e->set = set_adapter_int; |
| e->adapter.summary_addr = ue->u.adapter.summary_addr; |
| e->adapter.ind_addr = ue->u.adapter.ind_addr; |
| e->adapter.summary_offset = ue->u.adapter.summary_offset; |
| e->adapter.ind_offset = ue->u.adapter.ind_offset; |
| e->adapter.adapter_id = ue->u.adapter.adapter_id; |
| ret = 0; |
| break; |
| default: |
| ret = -EINVAL; |
| } |
| |
| return ret; |
| } |
| |
| int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm, |
| int irq_source_id, int level, bool line_status) |
| { |
| return -EINVAL; |
| } |
| |
| int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len) |
| { |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| struct kvm_s390_irq *buf; |
| int r = 0; |
| int n; |
| |
| buf = vmalloc(len); |
| if (!buf) |
| return -ENOMEM; |
| |
| if (copy_from_user((void *) buf, irqstate, len)) { |
| r = -EFAULT; |
| goto out_free; |
| } |
| |
| /* |
| * Don't allow setting the interrupt state |
| * when there are already interrupts pending |
| */ |
| spin_lock(&li->lock); |
| if (li->pending_irqs) { |
| r = -EBUSY; |
| goto out_unlock; |
| } |
| |
| for (n = 0; n < len / sizeof(*buf); n++) { |
| r = do_inject_vcpu(vcpu, &buf[n]); |
| if (r) |
| break; |
| } |
| |
| out_unlock: |
| spin_unlock(&li->lock); |
| out_free: |
| vfree(buf); |
| |
| return r; |
| } |
| |
| static void store_local_irq(struct kvm_s390_local_interrupt *li, |
| struct kvm_s390_irq *irq, |
| unsigned long irq_type) |
| { |
| switch (irq_type) { |
| case IRQ_PEND_MCHK_EX: |
| case IRQ_PEND_MCHK_REP: |
| irq->type = KVM_S390_MCHK; |
| irq->u.mchk = li->irq.mchk; |
| break; |
| case IRQ_PEND_PROG: |
| irq->type = KVM_S390_PROGRAM_INT; |
| irq->u.pgm = li->irq.pgm; |
| break; |
| case IRQ_PEND_PFAULT_INIT: |
| irq->type = KVM_S390_INT_PFAULT_INIT; |
| irq->u.ext = li->irq.ext; |
| break; |
| case IRQ_PEND_EXT_EXTERNAL: |
| irq->type = KVM_S390_INT_EXTERNAL_CALL; |
| irq->u.extcall = li->irq.extcall; |
| break; |
| case IRQ_PEND_EXT_CLOCK_COMP: |
| irq->type = KVM_S390_INT_CLOCK_COMP; |
| break; |
| case IRQ_PEND_EXT_CPU_TIMER: |
| irq->type = KVM_S390_INT_CPU_TIMER; |
| break; |
| case IRQ_PEND_SIGP_STOP: |
| irq->type = KVM_S390_SIGP_STOP; |
| irq->u.stop = li->irq.stop; |
| break; |
| case IRQ_PEND_RESTART: |
| irq->type = KVM_S390_RESTART; |
| break; |
| case IRQ_PEND_SET_PREFIX: |
| irq->type = KVM_S390_SIGP_SET_PREFIX; |
| irq->u.prefix = li->irq.prefix; |
| break; |
| } |
| } |
| |
| int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len) |
| { |
| int scn; |
| unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)]; |
| struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; |
| unsigned long pending_irqs; |
| struct kvm_s390_irq irq; |
| unsigned long irq_type; |
| int cpuaddr; |
| int n = 0; |
| |
| spin_lock(&li->lock); |
| pending_irqs = li->pending_irqs; |
| memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending, |
| sizeof(sigp_emerg_pending)); |
| spin_unlock(&li->lock); |
| |
| for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) { |
| memset(&irq, 0, sizeof(irq)); |
| if (irq_type == IRQ_PEND_EXT_EMERGENCY) |
| continue; |
| if (n + sizeof(irq) > len) |
| return -ENOBUFS; |
| store_local_irq(&vcpu->arch.local_int, &irq, irq_type); |
| if (copy_to_user(&buf[n], &irq, sizeof(irq))) |
| return -EFAULT; |
| n += sizeof(irq); |
| } |
| |
| if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) { |
| for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) { |
| memset(&irq, 0, sizeof(irq)); |
| if (n + sizeof(irq) > len) |
| return -ENOBUFS; |
| irq.type = KVM_S390_INT_EMERGENCY; |
| irq.u.emerg.code = cpuaddr; |
| if (copy_to_user(&buf[n], &irq, sizeof(irq))) |
| return -EFAULT; |
| n += sizeof(irq); |
| } |
| } |
| |
| if (sca_ext_call_pending(vcpu, &scn)) { |
| if (n + sizeof(irq) > len) |
| return -ENOBUFS; |
| memset(&irq, 0, sizeof(irq)); |
| irq.type = KVM_S390_INT_EXTERNAL_CALL; |
| irq.u.extcall.code = scn; |
| if (copy_to_user(&buf[n], &irq, sizeof(irq))) |
| return -EFAULT; |
| n += sizeof(irq); |
| } |
| |
| return n; |
| } |