interrupt.c 59.4 KB
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/*
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 * handling kvm guest interrupts
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 *
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 * Copyright IBM Corp. 2008, 2015
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 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (version 2 only)
 * as published by the Free Software Foundation.
 *
 *    Author(s): Carsten Otte <cotte@de.ibm.com>
 */

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#include <linux/interrupt.h>
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#include <linux/kvm_host.h>
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#include <linux/hrtimer.h>
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#include <linux/mmu_context.h>
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#include <linux/signal.h>
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#include <linux/slab.h>
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#include <linux/bitmap.h>
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#include <linux/vmalloc.h>
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#include <asm/asm-offsets.h>
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#include <asm/dis.h>
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#include <asm/uaccess.h>
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#include <asm/sclp.h>
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#include <asm/isc.h>
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#include "kvm-s390.h"
#include "gaccess.h"
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#include "trace-s390.h"
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#define IOINT_SCHID_MASK 0x0000ffff
#define IOINT_SSID_MASK 0x00030000
#define IOINT_CSSID_MASK 0x03fc0000
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#define PFAULT_INIT 0x0600
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#define PFAULT_DONE 0x0680
#define VIRTIO_PARAM 0x0d00
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int psw_extint_disabled(struct kvm_vcpu *vcpu)
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{
	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
}

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static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
{
	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
}

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static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
{
	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
}

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static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
{
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	return psw_extint_disabled(vcpu) &&
	       psw_ioint_disabled(vcpu) &&
	       psw_mchk_disabled(vcpu);
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}

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static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
{
	if (psw_extint_disabled(vcpu) ||
	    !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
		return 0;
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	if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
		/* No timer interrupts when single stepping */
		return 0;
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	return 1;
}

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static int ckc_irq_pending(struct kvm_vcpu *vcpu)
{
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	preempt_disable();
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	if (!(vcpu->arch.sie_block->ckc <
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	      get_tod_clock_fast() + vcpu->arch.sie_block->epoch)) {
		preempt_enable();
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		return 0;
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	}
	preempt_enable();
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	return ckc_interrupts_enabled(vcpu);
}

static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
{
	return !psw_extint_disabled(vcpu) &&
	       (vcpu->arch.sie_block->gcr[0] & 0x400ul);
}

static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
{
	return (vcpu->arch.sie_block->cputm >> 63) &&
	       cpu_timer_interrupts_enabled(vcpu);
}

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static inline int is_ioirq(unsigned long irq_type)
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{
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	return ((irq_type >= IRQ_PEND_IO_ISC_0) &&
		(irq_type <= IRQ_PEND_IO_ISC_7));
}
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static uint64_t isc_to_isc_bits(int isc)
{
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	return (0x80 >> isc) << 24;
}

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static inline u8 int_word_to_isc(u32 int_word)
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{
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	return (int_word & 0x38000000) >> 27;
}

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static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
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{
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	return vcpu->kvm->arch.float_int.pending_irqs |
	       vcpu->arch.local_int.pending_irqs;
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}

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static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
				   unsigned long active_mask)
{
	int i;

	for (i = 0; i <= MAX_ISC; i++)
		if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
			active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i));

	return active_mask;
}

static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
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{
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	unsigned long active_mask;

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	active_mask = pending_irqs(vcpu);
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	if (!active_mask)
		return 0;
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	if (psw_extint_disabled(vcpu))
		active_mask &= ~IRQ_PEND_EXT_MASK;
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	if (psw_ioint_disabled(vcpu))
		active_mask &= ~IRQ_PEND_IO_MASK;
	else
		active_mask = disable_iscs(vcpu, active_mask);
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	if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
		__clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
	if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
		__clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
	if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
		__clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
	if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
		__clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
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	if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
		__clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
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	if (psw_mchk_disabled(vcpu))
		active_mask &= ~IRQ_PEND_MCHK_MASK;
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	if (!(vcpu->arch.sie_block->gcr[14] &
	      vcpu->kvm->arch.float_int.mchk.cr14))
		__clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
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	/*
	 * 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);

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	return active_mask;
}

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static void __set_cpu_idle(struct kvm_vcpu *vcpu)
{
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	atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
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	set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
}

static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
{
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	atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
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	clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
}

static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
{
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	atomic_andnot(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
		    &vcpu->arch.sie_block->cpuflags);
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	vcpu->arch.sie_block->lctl = 0x0000;
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	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);
	}
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}

static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
{
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	atomic_or(flag, &vcpu->arch.sie_block->cpuflags);
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}

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static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
{
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	if (!(pending_irqs(vcpu) & IRQ_PEND_IO_MASK))
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		return;
	else if (psw_ioint_disabled(vcpu))
		__set_cpuflag(vcpu, CPUSTAT_IO_INT);
	else
		vcpu->arch.sie_block->lctl |= LCTL_CR6;
}

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static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
{
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	if (!(pending_irqs(vcpu) & IRQ_PEND_EXT_MASK))
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		return;
	if (psw_extint_disabled(vcpu))
		__set_cpuflag(vcpu, CPUSTAT_EXT_INT);
	else
		vcpu->arch.sie_block->lctl |= LCTL_CR0;
}

static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
{
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	if (!(pending_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
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		return;
	if (psw_mchk_disabled(vcpu))
		vcpu->arch.sie_block->ictl |= ICTL_LPSW;
	else
		vcpu->arch.sie_block->lctl |= LCTL_CR14;
}

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static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
{
	if (kvm_s390_is_stop_irq_pending(vcpu))
		__set_cpuflag(vcpu, CPUSTAT_STOP_INT);
}

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/* Set interception request for non-deliverable interrupts */
static void set_intercept_indicators(struct kvm_vcpu *vcpu)
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{
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	set_intercept_indicators_io(vcpu);
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	set_intercept_indicators_ext(vcpu);
	set_intercept_indicators_mchk(vcpu);
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	set_intercept_indicators_stop(vcpu);
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}

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static u16 get_ilc(struct kvm_vcpu *vcpu)
{
	switch (vcpu->arch.sie_block->icptcode) {
	case ICPT_INST:
	case ICPT_INSTPROGI:
	case ICPT_OPEREXC:
	case ICPT_PARTEXEC:
	case ICPT_IOINST:
		/* last instruction only stored for these icptcodes */
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		return insn_length(vcpu->arch.sie_block->ipa >> 8);
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	case ICPT_PROGI:
		return vcpu->arch.sie_block->pgmilc;
	default:
		return 0;
	}
}

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static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
{
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	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
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	int rc;

	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
					 0, 0);

	rc  = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
			   (u16 *)__LC_EXT_INT_CODE);
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	rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
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	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));
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	clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
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	return rc ? -EFAULT : 0;
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}

static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
{
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	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
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	int rc;

	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
					 0, 0);

	rc  = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
			   (u16 __user *)__LC_EXT_INT_CODE);
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	rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
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	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));
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	clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
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	return rc ? -EFAULT : 0;
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}

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static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
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{
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	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	struct kvm_s390_ext_info ext;
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	int rc;

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	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);

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	VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
		   ext.ext_params2);
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	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
					 KVM_S390_INT_PFAULT_INIT,
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					 0, ext.ext_params2);
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	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));
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	rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
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	return rc ? -EFAULT : 0;
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}

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static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
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{
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	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
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	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
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	struct kvm_s390_mchk_info mchk = {};
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	unsigned long adtl_status_addr;
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	int deliver = 0;
	int rc = 0;
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	spin_lock(&fi->lock);
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	spin_lock(&li->lock);
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	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;
	}
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	/*
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	 * We indicate floating repressible conditions along with
	 * other pending conditions. Channel Report Pending and Channel
	 * Subsystem damage are the only two and and are indicated by
	 * bits in mcic and masked in cr14.
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	 */
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	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;
	}
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	spin_unlock(&li->lock);
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	spin_unlock(&fi->lock);
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	if (deliver) {
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		VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
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			   mchk.mcic);
		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
						 KVM_S390_MCHK,
						 mchk.cr14, mchk.mcic);

		rc  = kvm_s390_vcpu_store_status(vcpu,
						 KVM_S390_STORE_STATUS_PREFIXED);
		rc |= read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR,
				    &adtl_status_addr,
				    sizeof(unsigned long));
		rc |= kvm_s390_vcpu_store_adtl_status(vcpu,
						      adtl_status_addr);
		rc |= put_guest_lc(vcpu, mchk.mcic,
				   (u64 __user *) __LC_MCCK_CODE);
		rc |= put_guest_lc(vcpu, mchk.failing_storage_address,
				   (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
		rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA,
				     &mchk.fixed_logout,
				     sizeof(mchk.fixed_logout));
		rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
				     &vcpu->arch.sie_block->gpsw,
				     sizeof(psw_t));
		rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
				    &vcpu->arch.sie_block->gpsw,
				    sizeof(psw_t));
	}
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	return rc ? -EFAULT : 0;
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}

static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
{
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	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
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	int rc;

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	VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
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	vcpu->stat.deliver_restart_signal++;
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);

	rc  = write_guest_lc(vcpu,
			     offsetof(struct _lowcore, restart_old_psw),
			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw),
			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
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	clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
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	return rc ? -EFAULT : 0;
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}

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static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
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{
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	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);
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	vcpu->stat.deliver_prefix_signal++;
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
					 KVM_S390_SIGP_SET_PREFIX,
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					 prefix.address, 0);
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	kvm_s390_set_prefix(vcpu, prefix.address);
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	return 0;
}

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static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
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{
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	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
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	int rc;
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	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);
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	VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
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	vcpu->stat.deliver_emergency_signal++;
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	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
					 cpu_addr, 0);
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	rc  = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
			   (u16 *)__LC_EXT_INT_CODE);
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	rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
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	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));
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	return rc ? -EFAULT : 0;
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}

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static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
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{
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	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	struct kvm_s390_extcall_info extcall;
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	int rc;

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	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);

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	VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
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	vcpu->stat.deliver_external_call++;
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
					 KVM_S390_INT_EXTERNAL_CALL,
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					 extcall.code, 0);
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	rc  = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
			   (u16 *)__LC_EXT_INT_CODE);
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	rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
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	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));
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	return rc ? -EFAULT : 0;
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}

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static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
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{
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	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	struct kvm_s390_pgm_info pgm_info;
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	int rc = 0, nullifying = false;
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	u16 ilc = get_ilc(vcpu);
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	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);

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	VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilc:%d",
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		   pgm_info.code, ilc);
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	vcpu->stat.deliver_program_int++;
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
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					 pgm_info.code, 0);
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	switch (pgm_info.code & ~PGM_PER) {
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	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:
520 521
		nullifying = true;
		/* fall through */
522
	case PGM_SPACE_SWITCH:
523
		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
524 525 526 527 528 529 530 531
				  (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:
532
		rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
533
				  (u8 *)__LC_EXC_ACCESS_ID);
534
		nullifying = true;
535 536 537 538 539 540 541
		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:
542
		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
543
				  (u64 *)__LC_TRANS_EXC_CODE);
544
		rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
545
				   (u8 *)__LC_EXC_ACCESS_ID);
546
		rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
547
				   (u8 *)__LC_OP_ACCESS_ID);
548
		nullifying = true;
549 550
		break;
	case PGM_MONITOR:
551
		rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
552
				  (u16 *)__LC_MON_CLASS_NR);
553
		rc |= put_guest_lc(vcpu, pgm_info.mon_code,
554 555
				   (u64 *)__LC_MON_CODE);
		break;
E
Eric Farman 已提交
556
	case PGM_VECTOR_PROCESSING:
557
	case PGM_DATA:
558
		rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
559 560 561
				  (u32 *)__LC_DATA_EXC_CODE);
		break;
	case PGM_PROTECTION:
562
		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
563
				  (u64 *)__LC_TRANS_EXC_CODE);
564
		rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
565 566
				   (u8 *)__LC_EXC_ACCESS_ID);
		break;
567 568 569 570 571 572 573 574 575
	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;
576 577
	}

578 579
	if (pgm_info.code & PGM_PER) {
		rc |= put_guest_lc(vcpu, pgm_info.per_code,
580
				   (u8 *) __LC_PER_CODE);
581
		rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
582
				   (u8 *)__LC_PER_ATMID);
583
		rc |= put_guest_lc(vcpu, pgm_info.per_address,
584
				   (u64 *) __LC_PER_ADDRESS);
585
		rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
586 587 588
				   (u8 *) __LC_PER_ACCESS_ID);
	}

589 590 591
	if (nullifying && vcpu->arch.sie_block->icptcode == ICPT_INST)
		kvm_s390_rewind_psw(vcpu, ilc);

592
	rc |= put_guest_lc(vcpu, ilc, (u16 *) __LC_PGM_ILC);
593 594
	rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
				 (u64 *) __LC_LAST_BREAK);
595
	rc |= put_guest_lc(vcpu, pgm_info.code,
596 597 598 599 600
			   (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));
601
	return rc ? -EFAULT : 0;
602 603
}

604
static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
605
{
606 607 608 609 610 611 612 613 614 615 616 617 618
	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	struct kvm_s390_ext_info ext;
	int rc = 0;

	spin_lock(&fi->lock);
	if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
		spin_unlock(&fi->lock);
		return 0;
	}
	ext = fi->srv_signal;
	memset(&fi->srv_signal, 0, sizeof(ext));
	clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
	spin_unlock(&fi->lock);
619

620
	VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
621
		   ext.ext_params);
622
	vcpu->stat.deliver_service_signal++;
623 624
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
					 ext.ext_params, 0);
625 626

	rc  = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
627
	rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
628 629 630 631
	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));
632
	rc |= put_guest_lc(vcpu, ext.ext_params,
633
			   (u32 *)__LC_EXT_PARAMS);
634

635
	return rc ? -EFAULT : 0;
636 637
}

638
static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
639
{
640 641 642
	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	struct kvm_s390_interrupt_info *inti;
	int rc = 0;
643

644 645 646 647 648 649 650 651 652 653 654
	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);
655

656
	if (inti) {
657 658 659 660 661 662
		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);

663 664 665 666 667 668 669 670 671 672 673 674 675 676
		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);
	}
677
	return rc ? -EFAULT : 0;
678 679
}

680
static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
681
{
682 683 684
	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	struct kvm_s390_interrupt_info *inti;
	int rc = 0;
685

686 687 688 689 690 691
	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,
692
			   "deliver: virtio parm: 0x%x,parm64: 0x%llx",
693 694 695 696 697 698 699 700 701 702 703 704
			   inti->ext.ext_params, inti->ext.ext_params2);
		vcpu->stat.deliver_virtio_interrupt++;
		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
				inti->type,
				inti->ext.ext_params,
				inti->ext.ext_params2);
		list_del(&inti->list);
		fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
	}
	if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
		clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
	spin_unlock(&fi->lock);
705

706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722
	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);
	}
723
	return rc ? -EFAULT : 0;
724 725 726
}

static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
727
				     unsigned long irq_type)
728
{
729 730 731 732
	struct list_head *isc_list;
	struct kvm_s390_float_interrupt *fi;
	struct kvm_s390_interrupt_info *inti = NULL;
	int rc = 0;
733

734
	fi = &vcpu->kvm->arch.float_int;
735

736 737 738 739 740 741
	spin_lock(&fi->lock);
	isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0];
	inti = list_first_entry_or_null(isc_list,
					struct kvm_s390_interrupt_info,
					list);
	if (inti) {
742
		VCPU_EVENT(vcpu, 4, "deliver: I/O 0x%llx", inti->type);
743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773
		vcpu->stat.deliver_io_int++;
		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
				inti->type,
				((__u32)inti->io.subchannel_id << 16) |
				inti->io.subchannel_nr,
				((__u64)inti->io.io_int_parm << 32) |
				inti->io.io_int_word);
		list_del(&inti->list);
		fi->counters[FIRQ_CNTR_IO] -= 1;
	}
	if (list_empty(isc_list))
		clear_bit(irq_type, &fi->pending_irqs);
	spin_unlock(&fi->lock);

	if (inti) {
		rc  = put_guest_lc(vcpu, inti->io.subchannel_id,
				(u16 *)__LC_SUBCHANNEL_ID);
		rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
				(u16 *)__LC_SUBCHANNEL_NR);
		rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
				(u32 *)__LC_IO_INT_PARM);
		rc |= put_guest_lc(vcpu, inti->io.io_int_word,
				(u32 *)__LC_IO_INT_WORD);
		rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
				&vcpu->arch.sie_block->gpsw,
				sizeof(psw_t));
		rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
				&vcpu->arch.sie_block->gpsw,
				sizeof(psw_t));
		kfree(inti);
	}
774

775
	return rc ? -EFAULT : 0;
776 777 778 779 780 781
}

typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);

static const deliver_irq_t deliver_irq_funcs[] = {
	[IRQ_PEND_MCHK_EX]        = __deliver_machine_check,
782
	[IRQ_PEND_MCHK_REP]       = __deliver_machine_check,
783 784 785 786 787 788 789 790
	[IRQ_PEND_PROG]           = __deliver_prog,
	[IRQ_PEND_EXT_EMERGENCY]  = __deliver_emergency_signal,
	[IRQ_PEND_EXT_EXTERNAL]   = __deliver_external_call,
	[IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
	[IRQ_PEND_EXT_CPU_TIMER]  = __deliver_cpu_timer,
	[IRQ_PEND_RESTART]        = __deliver_restart,
	[IRQ_PEND_SET_PREFIX]     = __deliver_set_prefix,
	[IRQ_PEND_PFAULT_INIT]    = __deliver_pfault_init,
791 792 793
	[IRQ_PEND_EXT_SERVICE]    = __deliver_service,
	[IRQ_PEND_PFAULT_DONE]    = __deliver_pfault_done,
	[IRQ_PEND_VIRTIO]         = __deliver_virtio,
794 795
};

796 797
/* Check whether an external call is pending (deliverable or not) */
int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
798
{
799 800
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
801

802
	if (!sclp.has_sigpif)
803
		return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
804

805 806
	return (sigp_ctrl & SIGP_CTRL_C) &&
	       (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND);
807 808
}

809
int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
810
{
811 812
	if (deliverable_irqs(vcpu))
		return 1;
813

814 815
	if (kvm_cpu_has_pending_timer(vcpu))
		return 1;
816

817
	/* external call pending and deliverable */
818
	if (kvm_s390_ext_call_pending(vcpu) &&
819 820
	    !psw_extint_disabled(vcpu) &&
	    (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
821
		return 1;
822

823 824 825
	if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
		return 1;
	return 0;
826 827
}

828 829
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
830
	return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
831 832
}

833 834 835 836 837 838
int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
{
	u64 now, sltime;

	vcpu->stat.exit_wait_state++;

839
	/* fast path */
840
	if (kvm_arch_vcpu_runnable(vcpu))
841
		return 0;
842

843 844
	if (psw_interrupts_disabled(vcpu)) {
		VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
845
		return -EOPNOTSUPP; /* disabled wait */
846 847
	}

848
	if (!ckc_interrupts_enabled(vcpu)) {
849
		VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
850
		__set_cpu_idle(vcpu);
851 852 853
		goto no_timer;
	}

854
	preempt_disable();
855
	now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
856
	preempt_enable();
857
	sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
858 859 860 861 862 863

	/* underflow */
	if (vcpu->arch.sie_block->ckc < now)
		return 0;

	__set_cpu_idle(vcpu);
864
	hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
865
	VCPU_EVENT(vcpu, 4, "enabled wait via clock comparator: %llu ns", sltime);
866
no_timer:
867
	srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
868
	kvm_vcpu_block(vcpu);
869
	__unset_cpu_idle(vcpu);
870 871
	vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);

872
	hrtimer_cancel(&vcpu->arch.ckc_timer);
873 874 875
	return 0;
}

876 877 878 879 880 881 882 883 884
void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
{
	if (waitqueue_active(&vcpu->wq)) {
		/*
		 * The vcpu gave up the cpu voluntarily, mark it as a good
		 * yield-candidate.
		 */
		vcpu->preempted = true;
		wake_up_interruptible(&vcpu->wq);
885
		vcpu->stat.halt_wakeup++;
886 887 888
	}
}

889 890 891
enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
{
	struct kvm_vcpu *vcpu;
892
	u64 now, sltime;
893 894

	vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
895
	preempt_disable();
896
	now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
897
	preempt_enable();
898
	sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
899

900 901 902 903 904 905 906 907
	/*
	 * If the monotonic clock runs faster than the tod clock we might be
	 * woken up too early and have to go back to sleep to avoid deadlocks.
	 */
	if (vcpu->arch.sie_block->ckc > now &&
	    hrtimer_forward_now(timer, ns_to_ktime(sltime)))
		return HRTIMER_RESTART;
	kvm_s390_vcpu_wakeup(vcpu);
908 909
	return HRTIMER_NORESTART;
}
910

911 912 913 914
void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

915
	spin_lock(&li->lock);
916 917 918
	li->pending_irqs = 0;
	bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
	memset(&li->irq, 0, sizeof(li->irq));
919
	spin_unlock(&li->lock);
920 921

	/* clear pending external calls set by sigp interpretation facility */
922
	atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags);
923
	vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl = 0;
924 925
}

926
int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
927
{
928
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
929
	deliver_irq_t func;
930
	int rc = 0;
931
	unsigned long irq_type;
932
	unsigned long irqs;
933 934 935

	__reset_intercept_indicators(vcpu);

936 937
	/* pending ckc conditions might have been invalidated */
	clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
938
	if (ckc_irq_pending(vcpu))
939 940
		set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);

941 942 943 944 945
	/* 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);

946
	while ((irqs = deliverable_irqs(vcpu)) && !rc) {
947
		/* bits are in the order of interrupt priority */
948 949 950 951 952 953 954 955 956 957 958
		irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
		if (is_ioirq(irq_type)) {
			rc = __deliver_io(vcpu, irq_type);
		} else {
			func = deliver_irq_funcs[irq_type];
			if (!func) {
				WARN_ON_ONCE(func == NULL);
				clear_bit(irq_type, &li->pending_irqs);
				continue;
			}
			rc = func(vcpu);
959
		}
960
	}
961

962
	set_intercept_indicators(vcpu);
963 964

	return rc;
965 966
}

967
static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
968 969 970
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

971 972 973 974
	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);

975
	li->irq.pgm = irq->u.pgm;
976
	set_bit(IRQ_PEND_PROG, &li->pending_irqs);
977 978 979
	return 0;
}

980
static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
981 982 983
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

984 985
	VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
		   irq->u.ext.ext_params2);
986 987
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
				   irq->u.ext.ext_params,
988
				   irq->u.ext.ext_params2);
989 990 991

	li->irq.ext = irq->u.ext;
	set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
992
	atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
993 994 995
	return 0;
}

996 997 998 999 1000 1001 1002 1003 1004 1005 1006
static int __inject_extcall_sigpif(struct kvm_vcpu *vcpu, uint16_t src_id)
{
	unsigned char new_val, old_val;
	uint8_t *sigp_ctrl = &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;

	new_val = SIGP_CTRL_C | (src_id & SIGP_CTRL_SCN_MASK);
	old_val = *sigp_ctrl & ~SIGP_CTRL_C;
	if (cmpxchg(sigp_ctrl, old_val, new_val) != old_val) {
		/* another external call is pending */
		return -EBUSY;
	}
1007
	atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
1008 1009 1010
	return 0;
}

1011
static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1012 1013
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1014
	struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1015
	uint16_t src_id = irq->u.extcall.code;
1016

1017
	VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1018
		   src_id);
1019
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1020
				   src_id, 0);
1021 1022 1023 1024 1025 1026

	/* sending vcpu invalid */
	if (src_id >= KVM_MAX_VCPUS ||
	    kvm_get_vcpu(vcpu->kvm, src_id) == NULL)
		return -EINVAL;

1027
	if (sclp.has_sigpif)
1028
		return __inject_extcall_sigpif(vcpu, src_id);
1029

1030
	if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1031
		return -EBUSY;
1032
	*extcall = irq->u.extcall;
1033
	atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1034 1035 1036
	return 0;
}

1037
static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1038 1039
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1040
	struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1041

1042
	VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1043
		   irq->u.prefix.address);
1044
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1045
				   irq->u.prefix.address, 0);
1046

1047 1048 1049
	if (!is_vcpu_stopped(vcpu))
		return -EBUSY;

1050 1051
	*prefix = irq->u.prefix;
	set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1052 1053 1054
	return 0;
}

1055
#define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1056
static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1057 1058
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1059
	struct kvm_s390_stop_info *stop = &li->irq.stop;
1060
	int rc = 0;
1061

1062
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1063

1064 1065 1066
	if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
		return -EINVAL;

1067 1068 1069 1070 1071 1072 1073 1074 1075
	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;
1076
	stop->flags = irq->u.stop.flags;
1077
	__set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1078 1079 1080 1081
	return 0;
}

static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1082
				 struct kvm_s390_irq *irq)
1083 1084 1085
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

1086
	VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1087
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1088 1089

	set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1090 1091 1092 1093
	return 0;
}

static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1094
				   struct kvm_s390_irq *irq)
1095 1096 1097
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

1098
	VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1099 1100
		   irq->u.emerg.code);
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1101
				   irq->u.emerg.code, 0);
1102

1103
	set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1104
	set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1105
	atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1106 1107 1108
	return 0;
}

1109
static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1110 1111
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1112
	struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1113

1114
	VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1115
		   irq->u.mchk.mcic);
1116
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1117
				   irq->u.mchk.mcic);
1118 1119

	/*
1120 1121 1122 1123 1124 1125
	 * 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
1126
	 */
1127
	mchk->cr14 |= irq->u.mchk.cr14;
1128
	mchk->mcic |= irq->u.mchk.mcic;
1129 1130 1131 1132
	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));
1133 1134 1135 1136
	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);
1137 1138 1139
	return 0;
}

1140
static int __inject_ckc(struct kvm_vcpu *vcpu)
1141 1142 1143
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

1144
	VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1145
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1146
				   0, 0);
1147 1148

	set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1149
	atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1150 1151 1152
	return 0;
}

1153
static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1154 1155 1156
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

1157
	VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1158
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1159
				   0, 0);
1160 1161

	set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1162
	atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1163 1164 1165
	return 0;
}

1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190
static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
						  int isc, u32 schid)
{
	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
	struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
	struct kvm_s390_interrupt_info *iter;
	u16 id = (schid & 0xffff0000U) >> 16;
	u16 nr = schid & 0x0000ffffU;

	spin_lock(&fi->lock);
	list_for_each_entry(iter, isc_list, list) {
		if (schid && (id != iter->io.subchannel_id ||
			      nr != iter->io.subchannel_nr))
			continue;
		/* found an appropriate entry */
		list_del_init(&iter->list);
		fi->counters[FIRQ_CNTR_IO] -= 1;
		if (list_empty(isc_list))
			clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
		spin_unlock(&fi->lock);
		return iter;
	}
	spin_unlock(&fi->lock);
	return NULL;
}
1191

1192 1193 1194 1195
/*
 * 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).
 */
1196
struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287
						    u64 isc_mask, u32 schid)
{
	struct kvm_s390_interrupt_info *inti = NULL;
	int isc;

	for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
		if (isc_mask & isc_to_isc_bits(isc))
			inti = get_io_int(kvm, isc, schid);
	}
	return inti;
}

#define SCCB_MASK 0xFFFFFFF8
#define SCCB_EVENT_PENDING 0x3

static int __inject_service(struct kvm *kvm,
			     struct kvm_s390_interrupt_info *inti)
{
	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;

	spin_lock(&fi->lock);
	fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
	/*
	 * Early versions of the QEMU s390 bios will inject several
	 * service interrupts after another without handling a
	 * condition code indicating busy.
	 * We will silently ignore those superfluous sccb values.
	 * A future version of QEMU will take care of serialization
	 * of servc requests
	 */
	if (fi->srv_signal.ext_params & SCCB_MASK)
		goto out;
	fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
	set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
out:
	spin_unlock(&fi->lock);
	kfree(inti);
	return 0;
}

static int __inject_virtio(struct kvm *kvm,
			    struct kvm_s390_interrupt_info *inti)
{
	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;

	spin_lock(&fi->lock);
	if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
		spin_unlock(&fi->lock);
		return -EBUSY;
	}
	fi->counters[FIRQ_CNTR_VIRTIO] += 1;
	list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
	set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
	spin_unlock(&fi->lock);
	return 0;
}

static int __inject_pfault_done(struct kvm *kvm,
				 struct kvm_s390_interrupt_info *inti)
{
	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;

	spin_lock(&fi->lock);
	if (fi->counters[FIRQ_CNTR_PFAULT] >=
		(ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
		spin_unlock(&fi->lock);
		return -EBUSY;
	}
	fi->counters[FIRQ_CNTR_PFAULT] += 1;
	list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
	set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
	spin_unlock(&fi->lock);
	return 0;
}

#define CR_PENDING_SUBCLASS 28
static int __inject_float_mchk(struct kvm *kvm,
				struct kvm_s390_interrupt_info *inti)
{
	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;

	spin_lock(&fi->lock);
	fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
	fi->mchk.mcic |= inti->mchk.mcic;
	set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
	spin_unlock(&fi->lock);
	kfree(inti);
	return 0;
}

static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1288 1289
{
	struct kvm_s390_float_interrupt *fi;
1290 1291
	struct list_head *list;
	int isc;
1292 1293 1294

	fi = &kvm->arch.float_int;
	spin_lock(&fi->lock);
1295 1296 1297
	if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
		spin_unlock(&fi->lock);
		return -EBUSY;
J
Jens Freimann 已提交
1298
	}
1299 1300 1301 1302 1303 1304
	fi->counters[FIRQ_CNTR_IO] += 1;

	isc = int_word_to_isc(inti->io.io_int_word);
	list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
	list_add_tail(&inti->list, list);
	set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1305
	spin_unlock(&fi->lock);
1306
	return 0;
1307
}
1308

1309 1310 1311 1312
/*
 * Find a destination VCPU for a floating irq and kick it.
 */
static void __floating_irq_kick(struct kvm *kvm, u64 type)
1313
{
1314
	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1315
	struct kvm_s390_local_interrupt *li;
1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340
	struct kvm_vcpu *dst_vcpu;
	int sigcpu, online_vcpus, nr_tries = 0;

	online_vcpus = atomic_read(&kvm->online_vcpus);
	if (!online_vcpus)
		return;

	/* find idle VCPUs first, then round robin */
	sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
	if (sigcpu == online_vcpus) {
		do {
			sigcpu = fi->next_rr_cpu;
			fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
			/* avoid endless loops if all vcpus are stopped */
			if (nr_tries++ >= online_vcpus)
				return;
		} while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
	}
	dst_vcpu = kvm_get_vcpu(kvm, sigcpu);

	/* make the VCPU drop out of the SIE, or wake it up if sleeping */
	li = &dst_vcpu->arch.local_int;
	spin_lock(&li->lock);
	switch (type) {
	case KVM_S390_MCHK:
1341
		atomic_or(CPUSTAT_STOP_INT, li->cpuflags);
1342 1343
		break;
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1344
		atomic_or(CPUSTAT_IO_INT, li->cpuflags);
1345 1346
		break;
	default:
1347
		atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1348 1349 1350 1351 1352 1353 1354 1355
		break;
	}
	spin_unlock(&li->lock);
	kvm_s390_vcpu_wakeup(dst_vcpu);
}

static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
{
1356 1357
	u64 type = READ_ONCE(inti->type);
	int rc;
1358

1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375
	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:
J
Jens Freimann 已提交
1376
		rc = -EINVAL;
1377
	}
1378 1379 1380
	if (rc)
		return rc;

1381
	__floating_irq_kick(kvm, type);
1382
	return 0;
1383 1384 1385 1386 1387 1388
}

int kvm_s390_inject_vm(struct kvm *kvm,
		       struct kvm_s390_interrupt *s390int)
{
	struct kvm_s390_interrupt_info *inti;
1389
	int rc;
1390

1391 1392 1393 1394
	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	if (!inti)
		return -ENOMEM;

1395 1396
	inti->type = s390int->type;
	switch (inti->type) {
1397
	case KVM_S390_INT_VIRTIO:
1398
		VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1399 1400 1401 1402 1403
			 s390int->parm, s390int->parm64);
		inti->ext.ext_params = s390int->parm;
		inti->ext.ext_params2 = s390int->parm64;
		break;
	case KVM_S390_INT_SERVICE:
1404
		VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1405 1406
		inti->ext.ext_params = s390int->parm;
		break;
1407 1408 1409
	case KVM_S390_INT_PFAULT_DONE:
		inti->ext.ext_params2 = s390int->parm64;
		break;
1410
	case KVM_S390_MCHK:
1411
		VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1412 1413 1414 1415
			 s390int->parm64);
		inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
		inti->mchk.mcic = s390int->parm64;
		break;
1416
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1417
		if (inti->type & KVM_S390_INT_IO_AI_MASK)
1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428
			VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
		else
			VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
				 s390int->type & IOINT_CSSID_MASK,
				 s390int->type & IOINT_SSID_MASK,
				 s390int->type & IOINT_SCHID_MASK);
		inti->io.subchannel_id = s390int->parm >> 16;
		inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
		inti->io.io_int_parm = s390int->parm64 >> 32;
		inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
		break;
1429 1430 1431 1432
	default:
		kfree(inti);
		return -EINVAL;
	}
1433 1434
	trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
				 2);
1435

1436 1437 1438 1439
	rc = __inject_vm(kvm, inti);
	if (rc)
		kfree(inti);
	return rc;
1440 1441
}

1442
int kvm_s390_reinject_io_int(struct kvm *kvm,
1443 1444
			      struct kvm_s390_interrupt_info *inti)
{
1445
	return __inject_vm(kvm, inti);
1446 1447
}

1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460
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;
1461 1462 1463
	case KVM_S390_SIGP_STOP:
		irq->u.stop.flags = s390int->parm;
		break;
1464
	case KVM_S390_INT_EXTERNAL_CALL:
1465
		if (s390int->parm & 0xffff0000)
1466 1467 1468 1469
			return -EINVAL;
		irq->u.extcall.code = s390int->parm;
		break;
	case KVM_S390_INT_EMERGENCY:
1470
		if (s390int->parm & 0xffff0000)
1471 1472 1473 1474 1475 1476 1477 1478 1479 1480
			return -EINVAL;
		irq->u.emerg.code = s390int->parm;
		break;
	case KVM_S390_MCHK:
		irq->u.mchk.mcic = s390int->parm64;
		break;
	}
	return 0;
}

1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497
int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

	return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
}

void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

	spin_lock(&li->lock);
	li->irq.stop.flags = 0;
	clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
	spin_unlock(&li->lock);
}

1498
static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1499
{
1500
	int rc;
1501

1502
	switch (irq->type) {
1503
	case KVM_S390_PROGRAM_INT:
1504
		rc = __inject_prog(vcpu, irq);
1505
		break;
1506
	case KVM_S390_SIGP_SET_PREFIX:
1507
		rc = __inject_set_prefix(vcpu, irq);
1508
		break;
1509
	case KVM_S390_SIGP_STOP:
1510
		rc = __inject_sigp_stop(vcpu, irq);
1511
		break;
1512
	case KVM_S390_RESTART:
1513
		rc = __inject_sigp_restart(vcpu, irq);
1514
		break;
1515
	case KVM_S390_INT_CLOCK_COMP:
1516
		rc = __inject_ckc(vcpu);
1517
		break;
1518
	case KVM_S390_INT_CPU_TIMER:
1519
		rc = __inject_cpu_timer(vcpu);
1520
		break;
1521
	case KVM_S390_INT_EXTERNAL_CALL:
1522
		rc = __inject_extcall(vcpu, irq);
1523
		break;
1524
	case KVM_S390_INT_EMERGENCY:
1525
		rc = __inject_sigp_emergency(vcpu, irq);
1526
		break;
1527
	case KVM_S390_MCHK:
1528
		rc = __inject_mchk(vcpu, irq);
1529
		break;
1530
	case KVM_S390_INT_PFAULT_INIT:
1531
		rc = __inject_pfault_init(vcpu, irq);
1532
		break;
1533 1534
	case KVM_S390_INT_VIRTIO:
	case KVM_S390_INT_SERVICE:
1535
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1536
	default:
1537
		rc = -EINVAL;
1538
	}
1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549

	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);
1550
	spin_unlock(&li->lock);
1551 1552 1553
	if (!rc)
		kvm_s390_vcpu_wakeup(vcpu);
	return rc;
1554
}
1555

1556
static inline void clear_irq_list(struct list_head *_list)
1557
{
1558
	struct kvm_s390_interrupt_info *inti, *n;
1559

1560
	list_for_each_entry_safe(inti, n, _list, list) {
1561 1562 1563 1564 1565
		list_del(&inti->list);
		kfree(inti);
	}
}

1566 1567
static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
		       struct kvm_s390_irq *irq)
1568
{
1569
	irq->type = inti->type;
1570
	switch (inti->type) {
1571 1572
	case KVM_S390_INT_PFAULT_INIT:
	case KVM_S390_INT_PFAULT_DONE:
1573
	case KVM_S390_INT_VIRTIO:
1574
		irq->u.ext = inti->ext;
1575 1576
		break;
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1577
		irq->u.io = inti->io;
1578 1579 1580 1581
		break;
	}
}

1582 1583 1584 1585 1586 1587
void kvm_s390_clear_float_irqs(struct kvm *kvm)
{
	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
	int i;

	spin_lock(&fi->lock);
1588 1589 1590
	fi->pending_irqs = 0;
	memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
	memset(&fi->mchk, 0, sizeof(fi->mchk));
1591 1592 1593 1594 1595 1596 1597
	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);
};

1598
static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1599 1600 1601
{
	struct kvm_s390_interrupt_info *inti;
	struct kvm_s390_float_interrupt *fi;
1602
	struct kvm_s390_irq *buf;
1603
	struct kvm_s390_irq *irq;
1604
	int max_irqs;
1605 1606
	int ret = 0;
	int n = 0;
1607
	int i;
1608

1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622
	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);

1623 1624
	fi = &kvm->arch.float_int;
	spin_lock(&fi->lock);
1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636
	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)) {
1637
		if (n == max_irqs) {
1638 1639
			/* signal userspace to try again */
			ret = -ENOMEM;
1640
			goto out;
1641
		}
1642 1643 1644
		irq = (struct kvm_s390_irq *) &buf[n];
		irq->type = KVM_S390_INT_SERVICE;
		irq->u.ext = fi->srv_signal;
1645 1646
		n++;
	}
1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659
	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:
1660
	spin_unlock(&fi->lock);
1661 1662 1663 1664 1665
	if (!ret && n > 0) {
		if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
			ret = -EFAULT;
	}
	vfree(buf);
1666 1667 1668 1669 1670 1671 1672 1673 1674 1675

	return ret < 0 ? ret : n;
}

static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
	int r;

	switch (attr->group) {
	case KVM_DEV_FLIC_GET_ALL_IRQS:
1676
		r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697
					  attr->attr);
		break;
	default:
		r = -EINVAL;
	}

	return r;
}

static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
				     u64 addr)
{
	struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
	void *target = NULL;
	void __user *source;
	u64 size;

	if (get_user(inti->type, (u64 __user *)addr))
		return -EFAULT;

	switch (inti->type) {
1698 1699
	case KVM_S390_INT_PFAULT_INIT:
	case KVM_S390_INT_PFAULT_DONE:
1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747
	case KVM_S390_INT_VIRTIO:
	case KVM_S390_INT_SERVICE:
		target = (void *) &inti->ext;
		source = &uptr->u.ext;
		size = sizeof(inti->ext);
		break;
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
		target = (void *) &inti->io;
		source = &uptr->u.io;
		size = sizeof(inti->io);
		break;
	case KVM_S390_MCHK:
		target = (void *) &inti->mchk;
		source = &uptr->u.mchk;
		size = sizeof(inti->mchk);
		break;
	default:
		return -EINVAL;
	}

	if (copy_from_user(target, source, size))
		return -EFAULT;

	return 0;
}

static int enqueue_floating_irq(struct kvm_device *dev,
				struct kvm_device_attr *attr)
{
	struct kvm_s390_interrupt_info *inti = NULL;
	int r = 0;
	int len = attr->attr;

	if (len % sizeof(struct kvm_s390_irq) != 0)
		return -EINVAL;
	else if (len > KVM_S390_FLIC_MAX_BUFFER)
		return -EINVAL;

	while (len >= sizeof(struct kvm_s390_irq)) {
		inti = kzalloc(sizeof(*inti), GFP_KERNEL);
		if (!inti)
			return -ENOMEM;

		r = copy_irq_from_user(inti, attr->addr);
		if (r) {
			kfree(inti);
			return r;
		}
J
Jens Freimann 已提交
1748 1749 1750 1751 1752
		r = __inject_vm(dev->kvm, inti);
		if (r) {
			kfree(inti);
			return r;
		}
1753 1754 1755 1756 1757 1758 1759
		len -= sizeof(struct kvm_s390_irq);
		attr->addr += sizeof(struct kvm_s390_irq);
	}

	return r;
}

1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825
static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
{
	if (id >= MAX_S390_IO_ADAPTERS)
		return NULL;
	return kvm->arch.adapters[id];
}

static int register_io_adapter(struct kvm_device *dev,
			       struct kvm_device_attr *attr)
{
	struct s390_io_adapter *adapter;
	struct kvm_s390_io_adapter adapter_info;

	if (copy_from_user(&adapter_info,
			   (void __user *)attr->addr, sizeof(adapter_info)))
		return -EFAULT;

	if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
	    (dev->kvm->arch.adapters[adapter_info.id] != NULL))
		return -EINVAL;

	adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
	if (!adapter)
		return -ENOMEM;

	INIT_LIST_HEAD(&adapter->maps);
	init_rwsem(&adapter->maps_lock);
	atomic_set(&adapter->nr_maps, 0);
	adapter->id = adapter_info.id;
	adapter->isc = adapter_info.isc;
	adapter->maskable = adapter_info.maskable;
	adapter->masked = false;
	adapter->swap = adapter_info.swap;
	dev->kvm->arch.adapters[adapter->id] = adapter;

	return 0;
}

int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
{
	int ret;
	struct s390_io_adapter *adapter = get_io_adapter(kvm, id);

	if (!adapter || !adapter->maskable)
		return -EINVAL;
	ret = adapter->masked;
	adapter->masked = masked;
	return ret;
}

static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
{
	struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
	struct s390_map_info *map;
	int ret;

	if (!adapter || !addr)
		return -EINVAL;

	map = kzalloc(sizeof(*map), GFP_KERNEL);
	if (!map) {
		ret = -ENOMEM;
		goto out;
	}
	INIT_LIST_HEAD(&map->list);
	map->guest_addr = addr;
1826
	map->addr = gmap_translate(kvm->arch.gmap, addr);
1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924
	if (map->addr == -EFAULT) {
		ret = -EFAULT;
		goto out;
	}
	ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
	if (ret < 0)
		goto out;
	BUG_ON(ret != 1);
	down_write(&adapter->maps_lock);
	if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
		list_add_tail(&map->list, &adapter->maps);
		ret = 0;
	} else {
		put_page(map->page);
		ret = -EINVAL;
	}
	up_write(&adapter->maps_lock);
out:
	if (ret)
		kfree(map);
	return ret;
}

static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
{
	struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
	struct s390_map_info *map, *tmp;
	int found = 0;

	if (!adapter || !addr)
		return -EINVAL;

	down_write(&adapter->maps_lock);
	list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
		if (map->guest_addr == addr) {
			found = 1;
			atomic_dec(&adapter->nr_maps);
			list_del(&map->list);
			put_page(map->page);
			kfree(map);
			break;
		}
	}
	up_write(&adapter->maps_lock);

	return found ? 0 : -EINVAL;
}

void kvm_s390_destroy_adapters(struct kvm *kvm)
{
	int i;
	struct s390_map_info *map, *tmp;

	for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
		if (!kvm->arch.adapters[i])
			continue;
		list_for_each_entry_safe(map, tmp,
					 &kvm->arch.adapters[i]->maps, list) {
			list_del(&map->list);
			put_page(map->page);
			kfree(map);
		}
		kfree(kvm->arch.adapters[i]);
	}
}

static int modify_io_adapter(struct kvm_device *dev,
			     struct kvm_device_attr *attr)
{
	struct kvm_s390_io_adapter_req req;
	struct s390_io_adapter *adapter;
	int ret;

	if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
		return -EFAULT;

	adapter = get_io_adapter(dev->kvm, req.id);
	if (!adapter)
		return -EINVAL;
	switch (req.type) {
	case KVM_S390_IO_ADAPTER_MASK:
		ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
		if (ret > 0)
			ret = 0;
		break;
	case KVM_S390_IO_ADAPTER_MAP:
		ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
		break;
	case KVM_S390_IO_ADAPTER_UNMAP:
		ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

1925 1926 1927
static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
	int r = 0;
1928 1929
	unsigned int i;
	struct kvm_vcpu *vcpu;
1930 1931 1932 1933 1934 1935

	switch (attr->group) {
	case KVM_DEV_FLIC_ENQUEUE:
		r = enqueue_floating_irq(dev, attr);
		break;
	case KVM_DEV_FLIC_CLEAR_IRQS:
1936
		kvm_s390_clear_float_irqs(dev->kvm);
1937
		break;
1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951
	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;
1952 1953 1954 1955 1956 1957
	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;
1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988
	default:
		r = -EINVAL;
	}

	return r;
}

static int flic_create(struct kvm_device *dev, u32 type)
{
	if (!dev)
		return -EINVAL;
	if (dev->kvm->arch.flic)
		return -EINVAL;
	dev->kvm->arch.flic = dev;
	return 0;
}

static void flic_destroy(struct kvm_device *dev)
{
	dev->kvm->arch.flic = NULL;
	kfree(dev);
}

/* s390 floating irq controller (flic) */
struct kvm_device_ops kvm_flic_ops = {
	.name = "kvm-flic",
	.get_attr = flic_get_attr,
	.set_attr = flic_set_attr,
	.create = flic_create,
	.destroy = flic_destroy,
};
1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080

static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
{
	unsigned long bit;

	bit = bit_nr + (addr % PAGE_SIZE) * 8;

	return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
}

static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
					  u64 addr)
{
	struct s390_map_info *map;

	if (!adapter)
		return NULL;

	list_for_each_entry(map, &adapter->maps, list) {
		if (map->guest_addr == addr)
			return map;
	}
	return NULL;
}

static int adapter_indicators_set(struct kvm *kvm,
				  struct s390_io_adapter *adapter,
				  struct kvm_s390_adapter_int *adapter_int)
{
	unsigned long bit;
	int summary_set, idx;
	struct s390_map_info *info;
	void *map;

	info = get_map_info(adapter, adapter_int->ind_addr);
	if (!info)
		return -1;
	map = page_address(info->page);
	bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
	set_bit(bit, map);
	idx = srcu_read_lock(&kvm->srcu);
	mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
	set_page_dirty_lock(info->page);
	info = get_map_info(adapter, adapter_int->summary_addr);
	if (!info) {
		srcu_read_unlock(&kvm->srcu, idx);
		return -1;
	}
	map = page_address(info->page);
	bit = get_ind_bit(info->addr, adapter_int->summary_offset,
			  adapter->swap);
	summary_set = test_and_set_bit(bit, map);
	mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
	set_page_dirty_lock(info->page);
	srcu_read_unlock(&kvm->srcu, idx);
	return summary_set ? 0 : 1;
}

/*
 * < 0 - not injected due to error
 * = 0 - coalesced, summary indicator already active
 * > 0 - injected interrupt
 */
static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
			   struct kvm *kvm, int irq_source_id, int level,
			   bool line_status)
{
	int ret;
	struct s390_io_adapter *adapter;

	/* We're only interested in the 0->1 transition. */
	if (!level)
		return 0;
	adapter = get_io_adapter(kvm, e->adapter.adapter_id);
	if (!adapter)
		return -1;
	down_read(&adapter->maps_lock);
	ret = adapter_indicators_set(kvm, adapter, &e->adapter);
	up_read(&adapter->maps_lock);
	if ((ret > 0) && !adapter->masked) {
		struct kvm_s390_interrupt s390int = {
			.type = KVM_S390_INT_IO(1, 0, 0, 0),
			.parm = 0,
			.parm64 = (adapter->isc << 27) | 0x80000000,
		};
		ret = kvm_s390_inject_vm(kvm, &s390int);
		if (ret == 0)
			ret = 1;
	}
	return ret;
}

2081
int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107
			  const struct kvm_irq_routing_entry *ue)
{
	int ret;

	switch (ue->type) {
	case KVM_IRQ_ROUTING_S390_ADAPTER:
		e->set = set_adapter_int;
		e->adapter.summary_addr = ue->u.adapter.summary_addr;
		e->adapter.ind_addr = ue->u.adapter.ind_addr;
		e->adapter.summary_offset = ue->u.adapter.summary_offset;
		e->adapter.ind_offset = ue->u.adapter.ind_offset;
		e->adapter.adapter_id = ue->u.adapter.adapter_id;
		ret = 0;
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
		int irq_source_id, int level, bool line_status)
{
	return -EINVAL;
}
2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247

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)
{
	uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
	unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	unsigned long pending_irqs;
	struct kvm_s390_irq irq;
	unsigned long irq_type;
	int cpuaddr;
	int n = 0;

	spin_lock(&li->lock);
	pending_irqs = li->pending_irqs;
	memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
	       sizeof(sigp_emerg_pending));
	spin_unlock(&li->lock);

	for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
		memset(&irq, 0, sizeof(irq));
		if (irq_type == IRQ_PEND_EXT_EMERGENCY)
			continue;
		if (n + sizeof(irq) > len)
			return -ENOBUFS;
		store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
		if (copy_to_user(&buf[n], &irq, sizeof(irq)))
			return -EFAULT;
		n += sizeof(irq);
	}

	if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
		for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
			memset(&irq, 0, sizeof(irq));
			if (n + sizeof(irq) > len)
				return -ENOBUFS;
			irq.type = KVM_S390_INT_EMERGENCY;
			irq.u.emerg.code = cpuaddr;
			if (copy_to_user(&buf[n], &irq, sizeof(irq)))
				return -EFAULT;
			n += sizeof(irq);
		}
	}

	if ((sigp_ctrl & SIGP_CTRL_C) &&
	    (atomic_read(&vcpu->arch.sie_block->cpuflags) &
	     CPUSTAT_ECALL_PEND)) {
		if (n + sizeof(irq) > len)
			return -ENOBUFS;
		memset(&irq, 0, sizeof(irq));
		irq.type = KVM_S390_INT_EXTERNAL_CALL;
		irq.u.extcall.code = sigp_ctrl & SIGP_CTRL_SCN_MASK;
		if (copy_to_user(&buf[n], &irq, sizeof(irq)))
			return -EFAULT;
		n += sizeof(irq);
	}

	return n;
}