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- // SPDX-License-Identifier: GPL-2.0
- /*
- * handling kvm guest interrupts
- *
- * Copyright IBM Corp. 2008, 2020
- *
- * Author(s): Carsten Otte <[email protected]>
- */
- #define KMSG_COMPONENT "kvm-s390"
- #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
- #include <linux/interrupt.h>
- #include <linux/kvm_host.h>
- #include <linux/hrtimer.h>
- #include <linux/mmu_context.h>
- #include <linux/nospec.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 <linux/uaccess.h>
- #include <asm/sclp.h>
- #include <asm/isc.h>
- #include <asm/gmap.h>
- #include <asm/switch_to.h>
- #include <asm/nmi.h>
- #include <asm/airq.h>
- #include <asm/tpi.h>
- #include "kvm-s390.h"
- #include "gaccess.h"
- #include "trace-s390.h"
- #include "pci.h"
- #define PFAULT_INIT 0x0600
- #define PFAULT_DONE 0x0680
- #define VIRTIO_PARAM 0x0d00
- static struct kvm_s390_gib *gib;
- /* handle external calls via sigp interpretation facility */
- static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
- {
- int c, scn;
- if (!kvm_s390_test_cpuflags(vcpu, CPUSTAT_ECALL_PEND))
- return 0;
- BUG_ON(!kvm_s390_use_sca_entries());
- 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;
- }
- static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
- {
- int expect, rc;
- BUG_ON(!kvm_s390_use_sca_entries());
- 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;
- old_val = READ_ONCE(*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;
- old_val = READ_ONCE(*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;
- }
- kvm_s390_set_cpuflags(vcpu, CPUSTAT_ECALL_PEND);
- return 0;
- }
- static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
- {
- int rc, expect;
- if (!kvm_s390_use_sca_entries())
- return;
- kvm_s390_clear_cpuflags(vcpu, CPUSTAT_ECALL_PEND);
- 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;
- old = READ_ONCE(*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;
- old = READ_ONCE(*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] & CR0_CLOCK_COMPARATOR_SUBMASK))
- 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)
- {
- const u64 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
- const u64 ckc = vcpu->arch.sie_block->ckc;
- if (vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SIGN) {
- if ((s64)ckc >= (s64)now)
- return 0;
- } else if (ckc >= now) {
- 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] & CR0_CPU_TIMER_SUBMASK);
- }
- static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
- {
- if (!cpu_timer_interrupts_enabled(vcpu))
- return 0;
- return kvm_s390_get_cpu_timer(vcpu) >> 63;
- }
- static uint64_t isc_to_isc_bits(int isc)
- {
- return (0x80 >> isc) << 24;
- }
- static inline u32 isc_to_int_word(u8 isc)
- {
- return ((u32)isc << 27) | 0x80000000;
- }
- static inline u8 int_word_to_isc(u32 int_word)
- {
- return (int_word & 0x38000000) >> 27;
- }
- /*
- * To use atomic bitmap functions, we have to provide a bitmap address
- * that is u64 aligned. However, the ipm might be u32 aligned.
- * Therefore, we logically start the bitmap at the very beginning of the
- * struct and fixup the bit number.
- */
- #define IPM_BIT_OFFSET (offsetof(struct kvm_s390_gisa, ipm) * BITS_PER_BYTE)
- /**
- * gisa_set_iam - change the GISA interruption alert mask
- *
- * @gisa: gisa to operate on
- * @iam: new IAM value to use
- *
- * Change the IAM atomically with the next alert address and the IPM
- * of the GISA if the GISA is not part of the GIB alert list. All three
- * fields are located in the first long word of the GISA.
- *
- * Returns: 0 on success
- * -EBUSY in case the gisa is part of the alert list
- */
- static inline int gisa_set_iam(struct kvm_s390_gisa *gisa, u8 iam)
- {
- u64 word, _word;
- do {
- word = READ_ONCE(gisa->u64.word[0]);
- if ((u64)gisa != word >> 32)
- return -EBUSY;
- _word = (word & ~0xffUL) | iam;
- } while (cmpxchg(&gisa->u64.word[0], word, _word) != word);
- return 0;
- }
- /**
- * gisa_clear_ipm - clear the GISA interruption pending mask
- *
- * @gisa: gisa to operate on
- *
- * Clear the IPM atomically with the next alert address and the IAM
- * of the GISA unconditionally. All three fields are located in the
- * first long word of the GISA.
- */
- static inline void gisa_clear_ipm(struct kvm_s390_gisa *gisa)
- {
- u64 word, _word;
- do {
- word = READ_ONCE(gisa->u64.word[0]);
- _word = word & ~(0xffUL << 24);
- } while (cmpxchg(&gisa->u64.word[0], word, _word) != word);
- }
- /**
- * gisa_get_ipm_or_restore_iam - return IPM or restore GISA IAM
- *
- * @gi: gisa interrupt struct to work on
- *
- * Atomically restores the interruption alert mask if none of the
- * relevant ISCs are pending and return the IPM.
- *
- * Returns: the relevant pending ISCs
- */
- static inline u8 gisa_get_ipm_or_restore_iam(struct kvm_s390_gisa_interrupt *gi)
- {
- u8 pending_mask, alert_mask;
- u64 word, _word;
- do {
- word = READ_ONCE(gi->origin->u64.word[0]);
- alert_mask = READ_ONCE(gi->alert.mask);
- pending_mask = (u8)(word >> 24) & alert_mask;
- if (pending_mask)
- return pending_mask;
- _word = (word & ~0xffUL) | alert_mask;
- } while (cmpxchg(&gi->origin->u64.word[0], word, _word) != word);
- return 0;
- }
- static inline int gisa_in_alert_list(struct kvm_s390_gisa *gisa)
- {
- return READ_ONCE(gisa->next_alert) != (u32)(u64)gisa;
- }
- static inline void gisa_set_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
- {
- set_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
- }
- static inline u8 gisa_get_ipm(struct kvm_s390_gisa *gisa)
- {
- return READ_ONCE(gisa->ipm);
- }
- static inline void gisa_clear_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
- {
- clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
- }
- static inline int gisa_tac_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
- {
- return test_and_clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
- }
- static inline unsigned long pending_irqs_no_gisa(struct kvm_vcpu *vcpu)
- {
- unsigned long pending = vcpu->kvm->arch.float_int.pending_irqs |
- vcpu->arch.local_int.pending_irqs;
- pending &= ~vcpu->kvm->arch.float_int.masked_irqs;
- return pending;
- }
- static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
- {
- struct kvm_s390_gisa_interrupt *gi = &vcpu->kvm->arch.gisa_int;
- unsigned long pending_mask;
- pending_mask = pending_irqs_no_gisa(vcpu);
- if (gi->origin)
- pending_mask |= gisa_get_ipm(gi->origin) << IRQ_PEND_IO_ISC_7;
- return pending_mask;
- }
- static inline int isc_to_irq_type(unsigned long isc)
- {
- return IRQ_PEND_IO_ISC_0 - isc;
- }
- static inline int irq_type_to_isc(unsigned long irq_type)
- {
- return IRQ_PEND_IO_ISC_0 - irq_type;
- }
- 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 << (isc_to_irq_type(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] & CR0_EXTERNAL_CALL_SUBMASK))
- __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
- if (!(vcpu->arch.sie_block->gcr[0] & CR0_EMERGENCY_SIGNAL_SUBMASK))
- __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
- if (!(vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SUBMASK))
- __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
- if (!(vcpu->arch.sie_block->gcr[0] & CR0_CPU_TIMER_SUBMASK))
- __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
- if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK)) {
- __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
- __clear_bit(IRQ_PEND_EXT_SERVICE_EV, &active_mask);
- }
- if (psw_mchk_disabled(vcpu))
- active_mask &= ~IRQ_PEND_MCHK_MASK;
- /* PV guest cpus can have a single interruption injected at a time. */
- if (kvm_s390_pv_cpu_get_handle(vcpu) &&
- vcpu->arch.sie_block->iictl != IICTL_CODE_NONE)
- active_mask &= ~(IRQ_PEND_EXT_II_MASK |
- IRQ_PEND_IO_MASK |
- IRQ_PEND_MCHK_MASK);
- /*
- * Check both floating and local interrupt's cr14 because
- * bit IRQ_PEND_MCHK_REP could be set in both cases.
- */
- if (!(vcpu->arch.sie_block->gcr[14] &
- (vcpu->kvm->arch.float_int.mchk.cr14 |
- vcpu->arch.local_int.irq.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)
- {
- kvm_s390_set_cpuflags(vcpu, CPUSTAT_WAIT);
- set_bit(vcpu->vcpu_idx, vcpu->kvm->arch.idle_mask);
- }
- static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
- {
- kvm_s390_clear_cpuflags(vcpu, CPUSTAT_WAIT);
- clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.idle_mask);
- }
- static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
- {
- kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IO_INT | CPUSTAT_EXT_INT |
- CPUSTAT_STOP_INT);
- 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_intercept_indicators_io(struct kvm_vcpu *vcpu)
- {
- if (!(pending_irqs_no_gisa(vcpu) & IRQ_PEND_IO_MASK))
- return;
- if (psw_ioint_disabled(vcpu))
- kvm_s390_set_cpuflags(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_no_gisa(vcpu) & IRQ_PEND_EXT_MASK))
- return;
- if (psw_extint_disabled(vcpu))
- kvm_s390_set_cpuflags(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_no_gisa(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))
- kvm_s390_set_cpuflags(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 int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
- {
- struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
- int rc = 0;
- vcpu->stat.deliver_cputm++;
- trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
- 0, 0);
- if (kvm_s390_pv_cpu_is_protected(vcpu)) {
- vcpu->arch.sie_block->iictl = IICTL_CODE_EXT;
- vcpu->arch.sie_block->eic = EXT_IRQ_CPU_TIMER;
- } else {
- 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 = 0;
- vcpu->stat.deliver_ckc++;
- trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
- 0, 0);
- if (kvm_s390_pv_cpu_is_protected(vcpu)) {
- vcpu->arch.sie_block->iictl = IICTL_CODE_EXT;
- vcpu->arch.sie_block->eic = EXT_IRQ_CLK_COMP;
- } else {
- 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 __write_machine_check(struct kvm_vcpu *vcpu,
- struct kvm_s390_mchk_info *mchk)
- {
- unsigned long ext_sa_addr;
- unsigned long lc;
- freg_t fprs[NUM_FPRS];
- union mci mci;
- int rc;
- /*
- * All other possible payload for a machine check (e.g. the register
- * contents in the save area) will be handled by the ultravisor, as
- * the hypervisor does not not have the needed information for
- * protected guests.
- */
- if (kvm_s390_pv_cpu_is_protected(vcpu)) {
- vcpu->arch.sie_block->iictl = IICTL_CODE_MCHK;
- vcpu->arch.sie_block->mcic = mchk->mcic;
- vcpu->arch.sie_block->faddr = mchk->failing_storage_address;
- vcpu->arch.sie_block->edc = mchk->ext_damage_code;
- return 0;
- }
- mci.val = mchk->mcic;
- /* take care of lazy register loading */
- save_fpu_regs();
- save_access_regs(vcpu->run->s.regs.acrs);
- if (MACHINE_HAS_GS && vcpu->arch.gs_enabled)
- save_gs_cb(current->thread.gs_cb);
- /* Extended save area */
- rc = read_guest_lc(vcpu, __LC_MCESAD, &ext_sa_addr,
- sizeof(unsigned long));
- /* Only bits 0 through 63-LC are used for address formation */
- lc = ext_sa_addr & MCESA_LC_MASK;
- if (test_kvm_facility(vcpu->kvm, 133)) {
- switch (lc) {
- case 0:
- case 10:
- ext_sa_addr &= ~0x3ffUL;
- break;
- case 11:
- ext_sa_addr &= ~0x7ffUL;
- break;
- case 12:
- ext_sa_addr &= ~0xfffUL;
- break;
- default:
- ext_sa_addr = 0;
- break;
- }
- } else {
- ext_sa_addr &= ~0x3ffUL;
- }
- if (!rc && mci.vr && ext_sa_addr && test_kvm_facility(vcpu->kvm, 129)) {
- if (write_guest_abs(vcpu, ext_sa_addr, vcpu->run->s.regs.vrs,
- 512))
- mci.vr = 0;
- } else {
- mci.vr = 0;
- }
- if (!rc && mci.gs && ext_sa_addr && test_kvm_facility(vcpu->kvm, 133)
- && (lc == 11 || lc == 12)) {
- if (write_guest_abs(vcpu, ext_sa_addr + 1024,
- &vcpu->run->s.regs.gscb, 32))
- mci.gs = 0;
- } else {
- mci.gs = 0;
- }
- /* General interruption information */
- rc |= put_guest_lc(vcpu, 1, (u8 __user *) __LC_AR_MODE_ID);
- 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));
- rc |= put_guest_lc(vcpu, mci.val, (u64 __user *) __LC_MCCK_CODE);
- /* Register-save areas */
- if (MACHINE_HAS_VX) {
- convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
- rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA, fprs, 128);
- } else {
- rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA,
- vcpu->run->s.regs.fprs, 128);
- }
- rc |= write_guest_lc(vcpu, __LC_GPREGS_SAVE_AREA,
- vcpu->run->s.regs.gprs, 128);
- rc |= put_guest_lc(vcpu, current->thread.fpu.fpc,
- (u32 __user *) __LC_FP_CREG_SAVE_AREA);
- rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->todpr,
- (u32 __user *) __LC_TOD_PROGREG_SAVE_AREA);
- rc |= put_guest_lc(vcpu, kvm_s390_get_cpu_timer(vcpu),
- (u64 __user *) __LC_CPU_TIMER_SAVE_AREA);
- rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->ckc >> 8,
- (u64 __user *) __LC_CLOCK_COMP_SAVE_AREA);
- rc |= write_guest_lc(vcpu, __LC_AREGS_SAVE_AREA,
- &vcpu->run->s.regs.acrs, 64);
- rc |= write_guest_lc(vcpu, __LC_CREGS_SAVE_AREA,
- &vcpu->arch.sie_block->gcr, 128);
- /* Extended interruption information */
- rc |= put_guest_lc(vcpu, mchk->ext_damage_code,
- (u32 __user *) __LC_EXT_DAMAGE_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));
- 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 = {};
- 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 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);
- vcpu->stat.deliver_machine_check++;
- rc = __write_machine_check(vcpu, &mchk);
- }
- return rc;
- }
- static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
- {
- struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
- int rc = 0;
- 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);
- if (kvm_s390_pv_cpu_is_protected(vcpu)) {
- vcpu->arch.sie_block->iictl = IICTL_CODE_RESTART;
- } else {
- 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);
- if (kvm_s390_pv_cpu_is_protected(vcpu)) {
- vcpu->arch.sie_block->iictl = IICTL_CODE_EXT;
- vcpu->arch.sie_block->eic = EXT_IRQ_EMERGENCY_SIG;
- vcpu->arch.sie_block->extcpuaddr = cpu_addr;
- return 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);
- if (kvm_s390_pv_cpu_is_protected(vcpu)) {
- vcpu->arch.sie_block->iictl = IICTL_CODE_EXT;
- vcpu->arch.sie_block->eic = EXT_IRQ_EXTERNAL_CALL;
- vcpu->arch.sie_block->extcpuaddr = extcall.code;
- return 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 __deliver_prog_pv(struct kvm_vcpu *vcpu, u16 code)
- {
- switch (code) {
- case PGM_SPECIFICATION:
- vcpu->arch.sie_block->iictl = IICTL_CODE_SPECIFICATION;
- break;
- case PGM_OPERAND:
- vcpu->arch.sie_block->iictl = IICTL_CODE_OPERAND;
- break;
- default:
- return -EINVAL;
- }
- return 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 ilen;
- 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);
- ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
- VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
- pgm_info.code, ilen);
- vcpu->stat.deliver_program++;
- trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
- pgm_info.code, 0);
- /* PER is handled by the ultravisor */
- if (kvm_s390_pv_cpu_is_protected(vcpu))
- return __deliver_prog_pv(vcpu, pgm_info.code & ~PGM_PER);
- 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;
- fallthrough;
- 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 && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND))
- kvm_s390_rewind_psw(vcpu, ilen);
- /* bit 1+2 of the target are the ilc, so we can directly use ilen */
- rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC);
- rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
- (u64 *) __LC_PGM_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;
- }
- #define SCCB_MASK 0xFFFFFFF8
- #define SCCB_EVENT_PENDING 0x3
- static int write_sclp(struct kvm_vcpu *vcpu, u32 parm)
- {
- int rc;
- if (kvm_s390_pv_cpu_get_handle(vcpu)) {
- vcpu->arch.sie_block->iictl = IICTL_CODE_EXT;
- vcpu->arch.sie_block->eic = EXT_IRQ_SERVICE_SIG;
- vcpu->arch.sie_block->eiparams = parm;
- return 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, parm,
- (u32 *)__LC_EXT_PARAMS);
- 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;
- spin_lock(&fi->lock);
- if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->masked_irqs) ||
- !(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);
- clear_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs);
- if (kvm_s390_pv_cpu_is_protected(vcpu))
- set_bit(IRQ_PEND_EXT_SERVICE, &fi->masked_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);
- return write_sclp(vcpu, ext.ext_params);
- }
- static int __must_check __deliver_service_ev(struct kvm_vcpu *vcpu)
- {
- struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
- struct kvm_s390_ext_info ext;
- spin_lock(&fi->lock);
- if (!(test_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs))) {
- spin_unlock(&fi->lock);
- return 0;
- }
- ext = fi->srv_signal;
- /* only clear the event bit */
- fi->srv_signal.ext_params &= ~SCCB_EVENT_PENDING;
- clear_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs);
- spin_unlock(&fi->lock);
- VCPU_EVENT(vcpu, 4, "%s", "deliver: sclp parameter event");
- vcpu->stat.deliver_service_signal++;
- trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
- ext.ext_params, 0);
- return write_sclp(vcpu, SCCB_EVENT_PENDING);
- }
- 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++;
- 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 __do_deliver_io(struct kvm_vcpu *vcpu, struct kvm_s390_io_info *io)
- {
- int rc;
- if (kvm_s390_pv_cpu_is_protected(vcpu)) {
- vcpu->arch.sie_block->iictl = IICTL_CODE_IO;
- vcpu->arch.sie_block->subchannel_id = io->subchannel_id;
- vcpu->arch.sie_block->subchannel_nr = io->subchannel_nr;
- vcpu->arch.sie_block->io_int_parm = io->io_int_parm;
- vcpu->arch.sie_block->io_int_word = io->io_int_word;
- return 0;
- }
- rc = put_guest_lc(vcpu, io->subchannel_id, (u16 *)__LC_SUBCHANNEL_ID);
- rc |= put_guest_lc(vcpu, io->subchannel_nr, (u16 *)__LC_SUBCHANNEL_NR);
- rc |= put_guest_lc(vcpu, io->io_int_parm, (u32 *)__LC_IO_INT_PARM);
- rc |= put_guest_lc(vcpu, 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));
- 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_gisa_interrupt *gi = &vcpu->kvm->arch.gisa_int;
- struct kvm_s390_interrupt_info *inti = NULL;
- struct kvm_s390_io_info io;
- u32 isc;
- int rc = 0;
- fi = &vcpu->kvm->arch.float_int;
- spin_lock(&fi->lock);
- isc = irq_type_to_isc(irq_type);
- isc_list = &fi->lists[isc];
- inti = list_first_entry_or_null(isc_list,
- struct kvm_s390_interrupt_info,
- list);
- if (inti) {
- if (inti->type & KVM_S390_INT_IO_AI_MASK)
- VCPU_EVENT(vcpu, 4, "%s", "deliver: I/O (AI)");
- else
- VCPU_EVENT(vcpu, 4, "deliver: I/O %x ss %x schid %04x",
- inti->io.subchannel_id >> 8,
- inti->io.subchannel_id >> 1 & 0x3,
- inti->io.subchannel_nr);
- vcpu->stat.deliver_io++;
- 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 = __do_deliver_io(vcpu, &(inti->io));
- kfree(inti);
- goto out;
- }
- if (gi->origin && gisa_tac_ipm_gisc(gi->origin, isc)) {
- /*
- * in case an adapter interrupt was not delivered
- * in SIE context KVM will handle the delivery
- */
- VCPU_EVENT(vcpu, 4, "%s isc %u", "deliver: I/O (AI/gisa)", isc);
- memset(&io, 0, sizeof(io));
- io.io_int_word = isc_to_int_word(isc);
- vcpu->stat.deliver_io++;
- trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
- KVM_S390_INT_IO(1, 0, 0, 0),
- ((__u32)io.subchannel_id << 16) |
- io.subchannel_nr,
- ((__u64)io.io_int_parm << 32) |
- io.io_int_word);
- rc = __do_deliver_io(vcpu, &io);
- }
- out:
- return rc;
- }
- /* 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] & CR0_EXTERNAL_CALL_SUBMASK))
- 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);
- }
- static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
- {
- const u64 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
- const u64 ckc = vcpu->arch.sie_block->ckc;
- u64 cputm, sltime = 0;
- if (ckc_interrupts_enabled(vcpu)) {
- if (vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SIGN) {
- if ((s64)now < (s64)ckc)
- sltime = tod_to_ns((s64)ckc - (s64)now);
- } else if (now < ckc) {
- sltime = tod_to_ns(ckc - now);
- }
- /* already expired */
- if (!sltime)
- return 0;
- if (cpu_timer_interrupts_enabled(vcpu)) {
- cputm = kvm_s390_get_cpu_timer(vcpu);
- /* already expired? */
- if (cputm >> 63)
- return 0;
- return min_t(u64, sltime, tod_to_ns(cputm));
- }
- } else if (cpu_timer_interrupts_enabled(vcpu)) {
- sltime = kvm_s390_get_cpu_timer(vcpu);
- /* already expired? */
- if (sltime >> 63)
- return 0;
- }
- return sltime;
- }
- int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
- {
- struct kvm_s390_gisa_interrupt *gi = &vcpu->kvm->arch.gisa_int;
- u64 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 (gi->origin &&
- (gisa_get_ipm_or_restore_iam(gi) &
- vcpu->arch.sie_block->gcr[6] >> 24))
- return 0;
- if (!ckc_interrupts_enabled(vcpu) &&
- !cpu_timer_interrupts_enabled(vcpu)) {
- VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
- __set_cpu_idle(vcpu);
- goto no_timer;
- }
- sltime = __calculate_sltime(vcpu);
- if (!sltime)
- return 0;
- __set_cpu_idle(vcpu);
- hrtimer_start(&vcpu->arch.ckc_timer, sltime, HRTIMER_MODE_REL);
- VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime);
- no_timer:
- kvm_vcpu_srcu_read_unlock(vcpu);
- kvm_vcpu_halt(vcpu);
- vcpu->valid_wakeup = false;
- __unset_cpu_idle(vcpu);
- kvm_vcpu_srcu_read_lock(vcpu);
- hrtimer_cancel(&vcpu->arch.ckc_timer);
- return 0;
- }
- void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
- {
- vcpu->valid_wakeup = true;
- kvm_vcpu_wake_up(vcpu);
- /*
- * The VCPU might not be sleeping but rather executing VSIE. Let's
- * kick it, so it leaves the SIE to process the request.
- */
- kvm_s390_vsie_kick(vcpu);
- }
- enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
- {
- struct kvm_vcpu *vcpu;
- u64 sltime;
- vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
- sltime = __calculate_sltime(vcpu);
- /*
- * 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 (sltime && 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;
- 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 reverse order of interrupt priority */
- irq_type = find_last_bit(&irqs, IRQ_PEND_COUNT);
- switch (irq_type) {
- case IRQ_PEND_IO_ISC_0:
- case IRQ_PEND_IO_ISC_1:
- case IRQ_PEND_IO_ISC_2:
- case IRQ_PEND_IO_ISC_3:
- case IRQ_PEND_IO_ISC_4:
- case IRQ_PEND_IO_ISC_5:
- case IRQ_PEND_IO_ISC_6:
- case IRQ_PEND_IO_ISC_7:
- rc = __deliver_io(vcpu, irq_type);
- break;
- case IRQ_PEND_MCHK_EX:
- case IRQ_PEND_MCHK_REP:
- rc = __deliver_machine_check(vcpu);
- break;
- case IRQ_PEND_PROG:
- rc = __deliver_prog(vcpu);
- break;
- case IRQ_PEND_EXT_EMERGENCY:
- rc = __deliver_emergency_signal(vcpu);
- break;
- case IRQ_PEND_EXT_EXTERNAL:
- rc = __deliver_external_call(vcpu);
- break;
- case IRQ_PEND_EXT_CLOCK_COMP:
- rc = __deliver_ckc(vcpu);
- break;
- case IRQ_PEND_EXT_CPU_TIMER:
- rc = __deliver_cpu_timer(vcpu);
- break;
- case IRQ_PEND_RESTART:
- rc = __deliver_restart(vcpu);
- break;
- case IRQ_PEND_SET_PREFIX:
- rc = __deliver_set_prefix(vcpu);
- break;
- case IRQ_PEND_PFAULT_INIT:
- rc = __deliver_pfault_init(vcpu);
- break;
- case IRQ_PEND_EXT_SERVICE:
- rc = __deliver_service(vcpu);
- break;
- case IRQ_PEND_EXT_SERVICE_EV:
- rc = __deliver_service_ev(vcpu);
- break;
- case IRQ_PEND_PFAULT_DONE:
- rc = __deliver_pfault_done(vcpu);
- break;
- case IRQ_PEND_VIRTIO:
- rc = __deliver_virtio(vcpu);
- break;
- default:
- WARN_ONCE(1, "Unknown pending irq type %ld", irq_type);
- clear_bit(irq_type, &li->pending_irqs);
- }
- }
- 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->stat.inject_program++;
- 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.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
- /* auto detection if no valid ILC was given */
- irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
- irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
- irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
- }
- if (irq->u.pgm.code == PGM_PER) {
- li->irq.pgm.code |= PGM_PER;
- li->irq.pgm.flags = irq->u.pgm.flags;
- /* 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;
- li->irq.pgm.flags = irq->u.pgm.flags;
- /* 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->stat.inject_pfault_init++;
- 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);
- kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
- 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->stat.inject_external_call++;
- 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 && !kvm_s390_pv_cpu_get_handle(vcpu))
- 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;
- kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
- 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->stat.inject_set_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;
- vcpu->stat.inject_stop_signal++;
- 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;
- kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
- return 0;
- }
- static int __inject_sigp_restart(struct kvm_vcpu *vcpu)
- {
- struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
- vcpu->stat.inject_restart++;
- 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->stat.inject_emergency_signal++;
- 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);
- kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
- 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->stat.inject_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->stat.inject_ckc++;
- 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);
- kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
- return 0;
- }
- static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
- {
- struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
- vcpu->stat.inject_cputm++;
- 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);
- kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
- 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(isc_to_irq_type(isc), &fi->pending_irqs);
- spin_unlock(&fi->lock);
- return iter;
- }
- spin_unlock(&fi->lock);
- return NULL;
- }
- static struct kvm_s390_interrupt_info *get_top_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;
- }
- static int get_top_gisa_isc(struct kvm *kvm, u64 isc_mask, u32 schid)
- {
- struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
- unsigned long active_mask;
- int isc;
- if (schid)
- goto out;
- if (!gi->origin)
- goto out;
- active_mask = (isc_mask & gisa_get_ipm(gi->origin) << 24) << 32;
- while (active_mask) {
- isc = __fls(active_mask) ^ (BITS_PER_LONG - 1);
- if (gisa_tac_ipm_gisc(gi->origin, isc))
- return isc;
- clear_bit_inv(isc, &active_mask);
- }
- out:
- return -EINVAL;
- }
- /*
- * 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).
- * Take into account the interrupts pending in the interrupt list and in GISA.
- *
- * Note that for a guest that does not enable I/O interrupts
- * but relies on TPI, a flood of classic interrupts may starve
- * out adapter interrupts on the same isc. Linux does not do
- * that, and it is possible to work around the issue by configuring
- * different iscs for classic and adapter interrupts in the guest,
- * but we may want to revisit this in the future.
- */
- struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
- u64 isc_mask, u32 schid)
- {
- struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
- struct kvm_s390_interrupt_info *inti, *tmp_inti;
- int isc;
- inti = get_top_io_int(kvm, isc_mask, schid);
- isc = get_top_gisa_isc(kvm, isc_mask, schid);
- if (isc < 0)
- /* no AI in GISA */
- goto out;
- if (!inti)
- /* AI in GISA but no classical IO int */
- goto gisa_out;
- /* both types of interrupts present */
- if (int_word_to_isc(inti->io.io_int_word) <= isc) {
- /* classical IO int with higher priority */
- gisa_set_ipm_gisc(gi->origin, isc);
- goto out;
- }
- gisa_out:
- tmp_inti = kzalloc(sizeof(*inti), GFP_KERNEL_ACCOUNT);
- if (tmp_inti) {
- tmp_inti->type = KVM_S390_INT_IO(1, 0, 0, 0);
- tmp_inti->io.io_int_word = isc_to_int_word(isc);
- if (inti)
- kvm_s390_reinject_io_int(kvm, inti);
- inti = tmp_inti;
- } else
- gisa_set_ipm_gisc(gi->origin, isc);
- out:
- return inti;
- }
- static int __inject_service(struct kvm *kvm,
- struct kvm_s390_interrupt_info *inti)
- {
- struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
- kvm->stat.inject_service_signal++;
- spin_lock(&fi->lock);
- fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
- /* We always allow events, track them separately from the sccb ints */
- if (fi->srv_signal.ext_params & SCCB_EVENT_PENDING)
- set_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs);
- /*
- * 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;
- kvm->stat.inject_virtio++;
- 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;
- kvm->stat.inject_pfault_done++;
- 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;
- kvm->stat.inject_float_mchk++;
- 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_gisa_interrupt *gi = &kvm->arch.gisa_int;
- struct kvm_s390_float_interrupt *fi;
- struct list_head *list;
- int isc;
- kvm->stat.inject_io++;
- isc = int_word_to_isc(inti->io.io_int_word);
- /*
- * We do not use the lock checking variant as this is just a
- * performance optimization and we do not hold the lock here.
- * This is ok as the code will pick interrupts from both "lists"
- * for delivery.
- */
- if (gi->origin && inti->type & KVM_S390_INT_IO_AI_MASK) {
- VM_EVENT(kvm, 4, "%s isc %1u", "inject: I/O (AI/gisa)", isc);
- gisa_set_ipm_gisc(gi->origin, isc);
- kfree(inti);
- return 0;
- }
- 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;
- if (inti->type & KVM_S390_INT_IO_AI_MASK)
- VM_EVENT(kvm, 4, "%s", "inject: I/O (AI)");
- else
- VM_EVENT(kvm, 4, "inject: I/O %x ss %x schid %04x",
- inti->io.subchannel_id >> 8,
- inti->io.subchannel_id >> 1 & 0x3,
- inti->io.subchannel_nr);
- list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
- list_add_tail(&inti->list, list);
- set_bit(isc_to_irq_type(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_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(kvm->arch.idle_mask, online_vcpus);
- if (sigcpu == online_vcpus) {
- do {
- sigcpu = kvm->arch.float_int.next_rr_cpu++;
- kvm->arch.float_int.next_rr_cpu %= 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 */
- switch (type) {
- case KVM_S390_MCHK:
- kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_STOP_INT);
- break;
- case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
- if (!(type & KVM_S390_INT_IO_AI_MASK &&
- kvm->arch.gisa_int.origin) ||
- kvm_s390_pv_cpu_get_handle(dst_vcpu))
- kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_IO_INT);
- break;
- default:
- kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_EXT_INT);
- break;
- }
- 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_ACCOUNT);
- 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:
- 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;
- case KVM_S390_INT_PFAULT_INIT:
- irq->u.ext.ext_params = s390int->parm;
- irq->u.ext.ext_params2 = s390int->parm64;
- break;
- case KVM_S390_RESTART:
- case KVM_S390_INT_CLOCK_COMP:
- case KVM_S390_INT_CPU_TIMER:
- break;
- default:
- return -EINVAL;
- }
- 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);
- }
- int kvm_s390_is_restart_irq_pending(struct kvm_vcpu *vcpu)
- {
- struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
- return test_bit(IRQ_PEND_RESTART, &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);
- 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;
- mutex_lock(&kvm->lock);
- if (!kvm_s390_pv_is_protected(kvm))
- fi->masked_irqs = 0;
- mutex_unlock(&kvm->lock);
- 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);
- kvm_s390_gisa_clear(kvm);
- };
- static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
- {
- struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
- 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);
- if (gi->origin && gisa_get_ipm(gi->origin)) {
- for (i = 0; i <= MAX_ISC; i++) {
- if (n == max_irqs) {
- /* signal userspace to try again */
- ret = -ENOMEM;
- goto out_nolock;
- }
- if (gisa_tac_ipm_gisc(gi->origin, i)) {
- irq = (struct kvm_s390_irq *) &buf[n];
- irq->type = KVM_S390_INT_IO(1, 0, 0, 0);
- irq->u.io.io_int_word = isc_to_int_word(i);
- n++;
- }
- }
- }
- 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) ||
- test_bit(IRQ_PEND_EXT_SERVICE_EV, &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);
- out_nolock:
- 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_ais_mode_get_all(struct kvm *kvm, struct kvm_device_attr *attr)
- {
- struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
- struct kvm_s390_ais_all ais;
- if (attr->attr < sizeof(ais))
- return -EINVAL;
- if (!test_kvm_facility(kvm, 72))
- return -EOPNOTSUPP;
- mutex_lock(&fi->ais_lock);
- ais.simm = fi->simm;
- ais.nimm = fi->nimm;
- mutex_unlock(&fi->ais_lock);
- if (copy_to_user((void __user *)attr->addr, &ais, sizeof(ais)))
- return -EFAULT;
- return 0;
- }
- 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;
- case KVM_DEV_FLIC_AISM_ALL:
- r = flic_ais_mode_get_all(dev->kvm, 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_ACCOUNT);
- 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;
- id = array_index_nospec(id, MAX_S390_IO_ADAPTERS);
- 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)
- return -EINVAL;
- adapter_info.id = array_index_nospec(adapter_info.id,
- MAX_S390_IO_ADAPTERS);
- if (dev->kvm->arch.adapters[adapter_info.id] != NULL)
- return -EINVAL;
- adapter = kzalloc(sizeof(*adapter), GFP_KERNEL_ACCOUNT);
- if (!adapter)
- return -ENOMEM;
- adapter->id = adapter_info.id;
- adapter->isc = adapter_info.isc;
- adapter->maskable = adapter_info.maskable;
- adapter->masked = false;
- adapter->swap = adapter_info.swap;
- adapter->suppressible = (adapter_info.flags) &
- KVM_S390_ADAPTER_SUPPRESSIBLE;
- 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;
- }
- void kvm_s390_destroy_adapters(struct kvm *kvm)
- {
- int i;
- for (i = 0; i < MAX_S390_IO_ADAPTERS; i++)
- 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;
- /*
- * The following operations are no longer needed and therefore no-ops.
- * The gpa to hva translation is done when an IRQ route is set up. The
- * set_irq code uses get_user_pages_remote() to do the actual write.
- */
- case KVM_S390_IO_ADAPTER_MAP:
- case KVM_S390_IO_ADAPTER_UNMAP:
- ret = 0;
- break;
- default:
- ret = -EINVAL;
- }
- return ret;
- }
- static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
- {
- const u64 isc_mask = 0xffUL << 24; /* all iscs set */
- u32 schid;
- if (attr->flags)
- return -EINVAL;
- if (attr->attr != sizeof(schid))
- return -EINVAL;
- if (copy_from_user(&schid, (void __user *) attr->addr, sizeof(schid)))
- return -EFAULT;
- if (!schid)
- return -EINVAL;
- kfree(kvm_s390_get_io_int(kvm, isc_mask, schid));
- /*
- * If userspace is conforming to the architecture, we can have at most
- * one pending I/O interrupt per subchannel, so this is effectively a
- * clear all.
- */
- return 0;
- }
- static int modify_ais_mode(struct kvm *kvm, struct kvm_device_attr *attr)
- {
- struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
- struct kvm_s390_ais_req req;
- int ret = 0;
- if (!test_kvm_facility(kvm, 72))
- return -EOPNOTSUPP;
- if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
- return -EFAULT;
- if (req.isc > MAX_ISC)
- return -EINVAL;
- trace_kvm_s390_modify_ais_mode(req.isc,
- (fi->simm & AIS_MODE_MASK(req.isc)) ?
- (fi->nimm & AIS_MODE_MASK(req.isc)) ?
- 2 : KVM_S390_AIS_MODE_SINGLE :
- KVM_S390_AIS_MODE_ALL, req.mode);
- mutex_lock(&fi->ais_lock);
- switch (req.mode) {
- case KVM_S390_AIS_MODE_ALL:
- fi->simm &= ~AIS_MODE_MASK(req.isc);
- fi->nimm &= ~AIS_MODE_MASK(req.isc);
- break;
- case KVM_S390_AIS_MODE_SINGLE:
- fi->simm |= AIS_MODE_MASK(req.isc);
- fi->nimm &= ~AIS_MODE_MASK(req.isc);
- break;
- default:
- ret = -EINVAL;
- }
- mutex_unlock(&fi->ais_lock);
- return ret;
- }
- static int kvm_s390_inject_airq(struct kvm *kvm,
- struct s390_io_adapter *adapter)
- {
- struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
- struct kvm_s390_interrupt s390int = {
- .type = KVM_S390_INT_IO(1, 0, 0, 0),
- .parm = 0,
- .parm64 = isc_to_int_word(adapter->isc),
- };
- int ret = 0;
- if (!test_kvm_facility(kvm, 72) || !adapter->suppressible)
- return kvm_s390_inject_vm(kvm, &s390int);
- mutex_lock(&fi->ais_lock);
- if (fi->nimm & AIS_MODE_MASK(adapter->isc)) {
- trace_kvm_s390_airq_suppressed(adapter->id, adapter->isc);
- goto out;
- }
- ret = kvm_s390_inject_vm(kvm, &s390int);
- if (!ret && (fi->simm & AIS_MODE_MASK(adapter->isc))) {
- fi->nimm |= AIS_MODE_MASK(adapter->isc);
- trace_kvm_s390_modify_ais_mode(adapter->isc,
- KVM_S390_AIS_MODE_SINGLE, 2);
- }
- out:
- mutex_unlock(&fi->ais_lock);
- return ret;
- }
- static int flic_inject_airq(struct kvm *kvm, struct kvm_device_attr *attr)
- {
- unsigned int id = attr->attr;
- struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
- if (!adapter)
- return -EINVAL;
- return kvm_s390_inject_airq(kvm, adapter);
- }
- static int flic_ais_mode_set_all(struct kvm *kvm, struct kvm_device_attr *attr)
- {
- struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
- struct kvm_s390_ais_all ais;
- if (!test_kvm_facility(kvm, 72))
- return -EOPNOTSUPP;
- if (copy_from_user(&ais, (void __user *)attr->addr, sizeof(ais)))
- return -EFAULT;
- mutex_lock(&fi->ais_lock);
- fi->simm = ais.simm;
- fi->nimm = ais.nimm;
- mutex_unlock(&fi->ais_lock);
- return 0;
- }
- static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
- {
- int r = 0;
- unsigned long 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;
- case KVM_DEV_FLIC_CLEAR_IO_IRQ:
- r = clear_io_irq(dev->kvm, attr);
- break;
- case KVM_DEV_FLIC_AISM:
- r = modify_ais_mode(dev->kvm, attr);
- break;
- case KVM_DEV_FLIC_AIRQ_INJECT:
- r = flic_inject_airq(dev->kvm, attr);
- break;
- case KVM_DEV_FLIC_AISM_ALL:
- r = flic_ais_mode_set_all(dev->kvm, attr);
- break;
- default:
- r = -EINVAL;
- }
- return r;
- }
- static int flic_has_attr(struct kvm_device *dev,
- struct kvm_device_attr *attr)
- {
- switch (attr->group) {
- case KVM_DEV_FLIC_GET_ALL_IRQS:
- case KVM_DEV_FLIC_ENQUEUE:
- case KVM_DEV_FLIC_CLEAR_IRQS:
- case KVM_DEV_FLIC_APF_ENABLE:
- case KVM_DEV_FLIC_APF_DISABLE_WAIT:
- case KVM_DEV_FLIC_ADAPTER_REGISTER:
- case KVM_DEV_FLIC_ADAPTER_MODIFY:
- case KVM_DEV_FLIC_CLEAR_IO_IRQ:
- case KVM_DEV_FLIC_AISM:
- case KVM_DEV_FLIC_AIRQ_INJECT:
- case KVM_DEV_FLIC_AISM_ALL:
- return 0;
- }
- return -ENXIO;
- }
- 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,
- .has_attr = flic_has_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 page *get_map_page(struct kvm *kvm, u64 uaddr)
- {
- struct page *page = NULL;
- mmap_read_lock(kvm->mm);
- get_user_pages_remote(kvm->mm, uaddr, 1, FOLL_WRITE,
- &page, NULL, NULL);
- mmap_read_unlock(kvm->mm);
- return page;
- }
- 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 page *ind_page, *summary_page;
- void *map;
- ind_page = get_map_page(kvm, adapter_int->ind_addr);
- if (!ind_page)
- return -1;
- summary_page = get_map_page(kvm, adapter_int->summary_addr);
- if (!summary_page) {
- put_page(ind_page);
- return -1;
- }
- idx = srcu_read_lock(&kvm->srcu);
- map = page_address(ind_page);
- bit = get_ind_bit(adapter_int->ind_addr,
- adapter_int->ind_offset, adapter->swap);
- set_bit(bit, map);
- mark_page_dirty(kvm, adapter_int->ind_addr >> PAGE_SHIFT);
- set_page_dirty_lock(ind_page);
- map = page_address(summary_page);
- bit = get_ind_bit(adapter_int->summary_addr,
- adapter_int->summary_offset, adapter->swap);
- summary_set = test_and_set_bit(bit, map);
- mark_page_dirty(kvm, adapter_int->summary_addr >> PAGE_SHIFT);
- set_page_dirty_lock(summary_page);
- srcu_read_unlock(&kvm->srcu, idx);
- put_page(ind_page);
- put_page(summary_page);
- 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;
- ret = adapter_indicators_set(kvm, adapter, &e->adapter);
- if ((ret > 0) && !adapter->masked) {
- ret = kvm_s390_inject_airq(kvm, adapter);
- if (ret == 0)
- ret = 1;
- }
- return ret;
- }
- /*
- * Inject the machine check to the guest.
- */
- void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
- struct mcck_volatile_info *mcck_info)
- {
- struct kvm_s390_interrupt_info inti;
- struct kvm_s390_irq irq;
- struct kvm_s390_mchk_info *mchk;
- union mci mci;
- __u64 cr14 = 0; /* upper bits are not used */
- int rc;
- mci.val = mcck_info->mcic;
- if (mci.sr)
- cr14 |= CR14_RECOVERY_SUBMASK;
- if (mci.dg)
- cr14 |= CR14_DEGRADATION_SUBMASK;
- if (mci.w)
- cr14 |= CR14_WARNING_SUBMASK;
- mchk = mci.ck ? &inti.mchk : &irq.u.mchk;
- mchk->cr14 = cr14;
- mchk->mcic = mcck_info->mcic;
- mchk->ext_damage_code = mcck_info->ext_damage_code;
- mchk->failing_storage_address = mcck_info->failing_storage_address;
- if (mci.ck) {
- /* Inject the floating machine check */
- inti.type = KVM_S390_MCHK;
- rc = __inject_vm(vcpu->kvm, &inti);
- } else {
- /* Inject the machine check to specified vcpu */
- irq.type = KVM_S390_MCHK;
- rc = kvm_s390_inject_vcpu(vcpu, &irq);
- }
- WARN_ON_ONCE(rc);
- }
- int kvm_set_routing_entry(struct kvm *kvm,
- struct kvm_kernel_irq_routing_entry *e,
- const struct kvm_irq_routing_entry *ue)
- {
- u64 uaddr;
- switch (ue->type) {
- /* we store the userspace addresses instead of the guest addresses */
- case KVM_IRQ_ROUTING_S390_ADAPTER:
- e->set = set_adapter_int;
- uaddr = gmap_translate(kvm->arch.gmap, ue->u.adapter.summary_addr);
- if (uaddr == -EFAULT)
- return -EFAULT;
- e->adapter.summary_addr = uaddr;
- uaddr = gmap_translate(kvm->arch.gmap, ue->u.adapter.ind_addr);
- if (uaddr == -EFAULT)
- return -EFAULT;
- e->adapter.ind_addr = uaddr;
- 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;
- return 0;
- default:
- return -EINVAL;
- }
- }
- 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;
- DECLARE_BITMAP(sigp_emerg_pending, 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;
- }
- static void __airqs_kick_single_vcpu(struct kvm *kvm, u8 deliverable_mask)
- {
- int vcpu_idx, online_vcpus = atomic_read(&kvm->online_vcpus);
- struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
- struct kvm_vcpu *vcpu;
- u8 vcpu_isc_mask;
- for_each_set_bit(vcpu_idx, kvm->arch.idle_mask, online_vcpus) {
- vcpu = kvm_get_vcpu(kvm, vcpu_idx);
- if (psw_ioint_disabled(vcpu))
- continue;
- vcpu_isc_mask = (u8)(vcpu->arch.sie_block->gcr[6] >> 24);
- if (deliverable_mask & vcpu_isc_mask) {
- /* lately kicked but not yet running */
- if (test_and_set_bit(vcpu_idx, gi->kicked_mask))
- return;
- kvm_s390_vcpu_wakeup(vcpu);
- return;
- }
- }
- }
- static enum hrtimer_restart gisa_vcpu_kicker(struct hrtimer *timer)
- {
- struct kvm_s390_gisa_interrupt *gi =
- container_of(timer, struct kvm_s390_gisa_interrupt, timer);
- struct kvm *kvm =
- container_of(gi->origin, struct sie_page2, gisa)->kvm;
- u8 pending_mask;
- pending_mask = gisa_get_ipm_or_restore_iam(gi);
- if (pending_mask) {
- __airqs_kick_single_vcpu(kvm, pending_mask);
- hrtimer_forward_now(timer, ns_to_ktime(gi->expires));
- return HRTIMER_RESTART;
- }
- return HRTIMER_NORESTART;
- }
- #define NULL_GISA_ADDR 0x00000000UL
- #define NONE_GISA_ADDR 0x00000001UL
- #define GISA_ADDR_MASK 0xfffff000UL
- static void process_gib_alert_list(void)
- {
- struct kvm_s390_gisa_interrupt *gi;
- struct kvm_s390_gisa *gisa;
- struct kvm *kvm;
- u32 final, origin = 0UL;
- do {
- /*
- * If the NONE_GISA_ADDR is still stored in the alert list
- * origin, we will leave the outer loop. No further GISA has
- * been added to the alert list by millicode while processing
- * the current alert list.
- */
- final = (origin & NONE_GISA_ADDR);
- /*
- * Cut off the alert list and store the NONE_GISA_ADDR in the
- * alert list origin to avoid further GAL interruptions.
- * A new alert list can be build up by millicode in parallel
- * for guests not in the yet cut-off alert list. When in the
- * final loop, store the NULL_GISA_ADDR instead. This will re-
- * enable GAL interruptions on the host again.
- */
- origin = xchg(&gib->alert_list_origin,
- (!final) ? NONE_GISA_ADDR : NULL_GISA_ADDR);
- /*
- * Loop through the just cut-off alert list and start the
- * gisa timers to kick idle vcpus to consume the pending
- * interruptions asap.
- */
- while (origin & GISA_ADDR_MASK) {
- gisa = (struct kvm_s390_gisa *)(u64)origin;
- origin = gisa->next_alert;
- gisa->next_alert = (u32)(u64)gisa;
- kvm = container_of(gisa, struct sie_page2, gisa)->kvm;
- gi = &kvm->arch.gisa_int;
- if (hrtimer_active(&gi->timer))
- hrtimer_cancel(&gi->timer);
- hrtimer_start(&gi->timer, 0, HRTIMER_MODE_REL);
- }
- } while (!final);
- }
- void kvm_s390_gisa_clear(struct kvm *kvm)
- {
- struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
- if (!gi->origin)
- return;
- gisa_clear_ipm(gi->origin);
- VM_EVENT(kvm, 3, "gisa 0x%pK cleared", gi->origin);
- }
- void kvm_s390_gisa_init(struct kvm *kvm)
- {
- struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
- if (!css_general_characteristics.aiv)
- return;
- gi->origin = &kvm->arch.sie_page2->gisa;
- gi->alert.mask = 0;
- spin_lock_init(&gi->alert.ref_lock);
- gi->expires = 50 * 1000; /* 50 usec */
- hrtimer_init(&gi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- gi->timer.function = gisa_vcpu_kicker;
- memset(gi->origin, 0, sizeof(struct kvm_s390_gisa));
- gi->origin->next_alert = (u32)(u64)gi->origin;
- VM_EVENT(kvm, 3, "gisa 0x%pK initialized", gi->origin);
- }
- void kvm_s390_gisa_enable(struct kvm *kvm)
- {
- struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
- struct kvm_vcpu *vcpu;
- unsigned long i;
- u32 gisa_desc;
- if (gi->origin)
- return;
- kvm_s390_gisa_init(kvm);
- gisa_desc = kvm_s390_get_gisa_desc(kvm);
- if (!gisa_desc)
- return;
- kvm_for_each_vcpu(i, vcpu, kvm) {
- mutex_lock(&vcpu->mutex);
- vcpu->arch.sie_block->gd = gisa_desc;
- vcpu->arch.sie_block->eca |= ECA_AIV;
- VCPU_EVENT(vcpu, 3, "AIV gisa format-%u enabled for cpu %03u",
- vcpu->arch.sie_block->gd & 0x3, vcpu->vcpu_id);
- mutex_unlock(&vcpu->mutex);
- }
- }
- void kvm_s390_gisa_destroy(struct kvm *kvm)
- {
- struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
- struct kvm_s390_gisa *gisa = gi->origin;
- if (!gi->origin)
- return;
- if (gi->alert.mask)
- KVM_EVENT(3, "vm 0x%pK has unexpected iam 0x%02x",
- kvm, gi->alert.mask);
- while (gisa_in_alert_list(gi->origin))
- cpu_relax();
- hrtimer_cancel(&gi->timer);
- gi->origin = NULL;
- VM_EVENT(kvm, 3, "gisa 0x%pK destroyed", gisa);
- }
- void kvm_s390_gisa_disable(struct kvm *kvm)
- {
- struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
- struct kvm_vcpu *vcpu;
- unsigned long i;
- if (!gi->origin)
- return;
- kvm_for_each_vcpu(i, vcpu, kvm) {
- mutex_lock(&vcpu->mutex);
- vcpu->arch.sie_block->eca &= ~ECA_AIV;
- vcpu->arch.sie_block->gd = 0U;
- mutex_unlock(&vcpu->mutex);
- VCPU_EVENT(vcpu, 3, "AIV disabled for cpu %03u", vcpu->vcpu_id);
- }
- kvm_s390_gisa_destroy(kvm);
- }
- /**
- * kvm_s390_gisc_register - register a guest ISC
- *
- * @kvm: the kernel vm to work with
- * @gisc: the guest interruption sub class to register
- *
- * The function extends the vm specific alert mask to use.
- * The effective IAM mask in the GISA is updated as well
- * in case the GISA is not part of the GIB alert list.
- * It will be updated latest when the IAM gets restored
- * by gisa_get_ipm_or_restore_iam().
- *
- * Returns: the nonspecific ISC (NISC) the gib alert mechanism
- * has registered with the channel subsystem.
- * -ENODEV in case the vm uses no GISA
- * -ERANGE in case the guest ISC is invalid
- */
- int kvm_s390_gisc_register(struct kvm *kvm, u32 gisc)
- {
- struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
- if (!gi->origin)
- return -ENODEV;
- if (gisc > MAX_ISC)
- return -ERANGE;
- spin_lock(&gi->alert.ref_lock);
- gi->alert.ref_count[gisc]++;
- if (gi->alert.ref_count[gisc] == 1) {
- gi->alert.mask |= 0x80 >> gisc;
- gisa_set_iam(gi->origin, gi->alert.mask);
- }
- spin_unlock(&gi->alert.ref_lock);
- return gib->nisc;
- }
- EXPORT_SYMBOL_GPL(kvm_s390_gisc_register);
- /**
- * kvm_s390_gisc_unregister - unregister a guest ISC
- *
- * @kvm: the kernel vm to work with
- * @gisc: the guest interruption sub class to register
- *
- * The function reduces the vm specific alert mask to use.
- * The effective IAM mask in the GISA is updated as well
- * in case the GISA is not part of the GIB alert list.
- * It will be updated latest when the IAM gets restored
- * by gisa_get_ipm_or_restore_iam().
- *
- * Returns: the nonspecific ISC (NISC) the gib alert mechanism
- * has registered with the channel subsystem.
- * -ENODEV in case the vm uses no GISA
- * -ERANGE in case the guest ISC is invalid
- * -EINVAL in case the guest ISC is not registered
- */
- int kvm_s390_gisc_unregister(struct kvm *kvm, u32 gisc)
- {
- struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
- int rc = 0;
- if (!gi->origin)
- return -ENODEV;
- if (gisc > MAX_ISC)
- return -ERANGE;
- spin_lock(&gi->alert.ref_lock);
- if (gi->alert.ref_count[gisc] == 0) {
- rc = -EINVAL;
- goto out;
- }
- gi->alert.ref_count[gisc]--;
- if (gi->alert.ref_count[gisc] == 0) {
- gi->alert.mask &= ~(0x80 >> gisc);
- gisa_set_iam(gi->origin, gi->alert.mask);
- }
- out:
- spin_unlock(&gi->alert.ref_lock);
- return rc;
- }
- EXPORT_SYMBOL_GPL(kvm_s390_gisc_unregister);
- static void aen_host_forward(unsigned long si)
- {
- struct kvm_s390_gisa_interrupt *gi;
- struct zpci_gaite *gaite;
- struct kvm *kvm;
- gaite = (struct zpci_gaite *)aift->gait +
- (si * sizeof(struct zpci_gaite));
- if (gaite->count == 0)
- return;
- if (gaite->aisb != 0)
- set_bit_inv(gaite->aisbo, phys_to_virt(gaite->aisb));
- kvm = kvm_s390_pci_si_to_kvm(aift, si);
- if (!kvm)
- return;
- gi = &kvm->arch.gisa_int;
- if (!(gi->origin->g1.simm & AIS_MODE_MASK(gaite->gisc)) ||
- !(gi->origin->g1.nimm & AIS_MODE_MASK(gaite->gisc))) {
- gisa_set_ipm_gisc(gi->origin, gaite->gisc);
- if (hrtimer_active(&gi->timer))
- hrtimer_cancel(&gi->timer);
- hrtimer_start(&gi->timer, 0, HRTIMER_MODE_REL);
- kvm->stat.aen_forward++;
- }
- }
- static void aen_process_gait(u8 isc)
- {
- bool found = false, first = true;
- union zpci_sic_iib iib = {{0}};
- unsigned long si, flags;
- spin_lock_irqsave(&aift->gait_lock, flags);
- if (!aift->gait) {
- spin_unlock_irqrestore(&aift->gait_lock, flags);
- return;
- }
- for (si = 0;;) {
- /* Scan adapter summary indicator bit vector */
- si = airq_iv_scan(aift->sbv, si, airq_iv_end(aift->sbv));
- if (si == -1UL) {
- if (first || found) {
- /* Re-enable interrupts. */
- zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, isc,
- &iib);
- first = found = false;
- } else {
- /* Interrupts on and all bits processed */
- break;
- }
- found = false;
- si = 0;
- /* Scan again after re-enabling interrupts */
- continue;
- }
- found = true;
- aen_host_forward(si);
- }
- spin_unlock_irqrestore(&aift->gait_lock, flags);
- }
- static void gib_alert_irq_handler(struct airq_struct *airq,
- struct tpi_info *tpi_info)
- {
- struct tpi_adapter_info *info = (struct tpi_adapter_info *)tpi_info;
- inc_irq_stat(IRQIO_GAL);
- if ((info->forward || info->error) &&
- IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) {
- aen_process_gait(info->isc);
- if (info->aism != 0)
- process_gib_alert_list();
- } else {
- process_gib_alert_list();
- }
- }
- static struct airq_struct gib_alert_irq = {
- .handler = gib_alert_irq_handler,
- .lsi_ptr = &gib_alert_irq.lsi_mask,
- };
- void kvm_s390_gib_destroy(void)
- {
- if (!gib)
- return;
- if (kvm_s390_pci_interp_allowed() && aift) {
- mutex_lock(&aift->aift_lock);
- kvm_s390_pci_aen_exit();
- mutex_unlock(&aift->aift_lock);
- }
- chsc_sgib(0);
- unregister_adapter_interrupt(&gib_alert_irq);
- free_page((unsigned long)gib);
- gib = NULL;
- }
- int kvm_s390_gib_init(u8 nisc)
- {
- int rc = 0;
- if (!css_general_characteristics.aiv) {
- KVM_EVENT(3, "%s", "gib not initialized, no AIV facility");
- goto out;
- }
- gib = (struct kvm_s390_gib *)get_zeroed_page(GFP_KERNEL_ACCOUNT | GFP_DMA);
- if (!gib) {
- rc = -ENOMEM;
- goto out;
- }
- gib_alert_irq.isc = nisc;
- if (register_adapter_interrupt(&gib_alert_irq)) {
- pr_err("Registering the GIB alert interruption handler failed\n");
- rc = -EIO;
- goto out_free_gib;
- }
- gib->nisc = nisc;
- if (chsc_sgib((u32)(u64)gib)) {
- pr_err("Associating the GIB with the AIV facility failed\n");
- free_page((unsigned long)gib);
- gib = NULL;
- rc = -EIO;
- goto out_unreg_gal;
- }
- if (kvm_s390_pci_interp_allowed()) {
- if (kvm_s390_pci_aen_init(nisc)) {
- pr_err("Initializing AEN for PCI failed\n");
- rc = -EIO;
- goto out_unreg_gal;
- }
- }
- KVM_EVENT(3, "gib 0x%pK (nisc=%d) initialized", gib, gib->nisc);
- goto out;
- out_unreg_gal:
- unregister_adapter_interrupt(&gib_alert_irq);
- out_free_gib:
- free_page((unsigned long)gib);
- gib = NULL;
- out:
- return rc;
- }
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