interrupt.c 49.9 KB
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/*
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 * handling kvm guest interrupts
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 *
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 * Copyright IBM Corp. 2008,2014
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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 <asm/asm-offsets.h>
#include <asm/uaccess.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
#define IOINT_AI_MASK 0x04000000
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#define PFAULT_INIT 0x0600
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#define PFAULT_DONE 0x0680
#define VIRTIO_PARAM 0x0d00
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static int is_ioint(u64 type)
{
	return ((type & 0xfffe0000u) != 0xfffe0000u);
}

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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)
{
	if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
	    (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
	    (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
		return 0;
	return 1;
}

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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 u64 int_word_to_isc_bits(u32 int_word)
{
	u8 isc = (int_word & 0x38000000) >> 27;

	return (0x80 >> isc) << 24;
}

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static int __must_check __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
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				      struct kvm_s390_interrupt_info *inti)
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{
	switch (inti->type) {
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	case KVM_S390_INT_EXTERNAL_CALL:
		if (psw_extint_disabled(vcpu))
			return 0;
		if (vcpu->arch.sie_block->gcr[0] & 0x2000ul)
			return 1;
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		return 0;
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	case KVM_S390_INT_EMERGENCY:
		if (psw_extint_disabled(vcpu))
			return 0;
		if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
			return 1;
		return 0;
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	case KVM_S390_INT_CLOCK_COMP:
		return ckc_interrupts_enabled(vcpu);
	case KVM_S390_INT_CPU_TIMER:
		if (psw_extint_disabled(vcpu))
			return 0;
		if (vcpu->arch.sie_block->gcr[0] & 0x400ul)
			return 1;
		return 0;
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	case KVM_S390_INT_SERVICE:
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	case KVM_S390_INT_PFAULT_INIT:
	case KVM_S390_INT_PFAULT_DONE:
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	case KVM_S390_INT_VIRTIO:
		if (psw_extint_disabled(vcpu))
			return 0;
		if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
			return 1;
		return 0;
	case KVM_S390_PROGRAM_INT:
	case KVM_S390_SIGP_STOP:
	case KVM_S390_SIGP_SET_PREFIX:
	case KVM_S390_RESTART:
		return 1;
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	case KVM_S390_MCHK:
		if (psw_mchk_disabled(vcpu))
			return 0;
		if (vcpu->arch.sie_block->gcr[14] & inti->mchk.cr14)
			return 1;
		return 0;
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	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
		if (psw_ioint_disabled(vcpu))
			return 0;
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		if (vcpu->arch.sie_block->gcr[6] &
		    int_word_to_isc_bits(inti->io.io_int_word))
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			return 1;
		return 0;
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	default:
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		printk(KERN_WARNING "illegal interrupt type %llx\n",
		       inti->type);
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		BUG();
	}
	return 0;
}

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

static unsigned long deliverable_local_irqs(struct kvm_vcpu *vcpu)
{
	unsigned long active_mask = pending_local_irqs(vcpu);

	if (psw_extint_disabled(vcpu))
		active_mask &= ~IRQ_PEND_EXT_MASK;
	if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
		__clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
	if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
		__clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
	if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
		__clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
	if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
		__clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
	if (psw_mchk_disabled(vcpu))
		active_mask &= ~IRQ_PEND_MCHK_MASK;

	return active_mask;
}

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

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

static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
{
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	atomic_clear_mask(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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	if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP)
		atomic_set_mask(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags);
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}

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

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

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

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

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static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
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				      struct kvm_s390_interrupt_info *inti)
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{
	switch (inti->type) {
	case KVM_S390_INT_SERVICE:
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	case KVM_S390_INT_PFAULT_DONE:
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	case KVM_S390_INT_VIRTIO:
		if (psw_extint_disabled(vcpu))
			__set_cpuflag(vcpu, CPUSTAT_EXT_INT);
		else
			vcpu->arch.sie_block->lctl |= LCTL_CR0;
		break;
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	case KVM_S390_MCHK:
		if (psw_mchk_disabled(vcpu))
			vcpu->arch.sie_block->ictl |= ICTL_LPSW;
		else
			vcpu->arch.sie_block->lctl |= LCTL_CR14;
		break;
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	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
		if (psw_ioint_disabled(vcpu))
			__set_cpuflag(vcpu, CPUSTAT_IO_INT);
		else
			vcpu->arch.sie_block->lctl |= LCTL_CR6;
		break;
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	default:
		BUG();
	}
}

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static u16 get_ilc(struct kvm_vcpu *vcpu)
{
	const unsigned short table[] = { 2, 4, 4, 6 };

	switch (vcpu->arch.sie_block->icptcode) {
	case ICPT_INST:
	case ICPT_INSTPROGI:
	case ICPT_OPEREXC:
	case ICPT_PARTEXEC:
	case ICPT_IOINST:
		/* last instruction only stored for these icptcodes */
		return table[vcpu->arch.sie_block->ipa >> 14];
	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);
	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;
}

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);
	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;
}

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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, "interrupt: pfault init parm:%x,parm64:%llx",
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		   0, 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;
}

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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_local_interrupt *li = &vcpu->arch.local_int;
	struct kvm_s390_mchk_info mchk;
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	int rc;

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	spin_lock(&li->lock);
	mchk = li->irq.mchk;
	/*
	 * 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 both bits
	 */
	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));
	spin_unlock(&li->lock);

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	VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx",
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		   mchk.mcic);
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	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_MCHK,
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					 mchk.cr14, mchk.mcic);
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	rc  = kvm_s390_vcpu_store_status(vcpu, KVM_S390_STORE_STATUS_PREFIXED);
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	rc |= put_guest_lc(vcpu, mchk.mcic,
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			   (u64 __user *) __LC_MCCK_CODE);
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	rc |= put_guest_lc(vcpu, mchk.failing_storage_address,
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			   (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
	rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA,
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			     &mchk.fixed_logout, sizeof(mchk.fixed_logout));
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	rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	return rc;
}

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;

	VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
	vcpu->stat.deliver_restart_signal++;
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);

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

static int __must_check __deliver_stop(struct kvm_vcpu *vcpu)
{
	VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
	vcpu->stat.deliver_stop_signal++;
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_SIGP_STOP,
					 0, 0);

	__set_cpuflag(vcpu, CPUSTAT_STOP_INT);
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	clear_bit(IRQ_PEND_SIGP_STOP, &vcpu->arch.local_int.pending_irqs);
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	return 0;
}

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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_EVENT(vcpu, 4, "interrupt: set prefix to %x", prefix.address);
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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", "interrupt: sigp emerg");
	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));
	return rc;
}

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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", "interrupt: sigp ext call");
	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));
	return rc;
}

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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;
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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, 4, "interrupt: pgm check code:%x, ilc:%x",
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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:
	case PGM_SPACE_SWITCH:
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		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
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				  (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:
521
		rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
522 523 524 525 526 527 528 529
				  (u8 *)__LC_EXC_ACCESS_ID);
		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:
530
		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
531
				  (u64 *)__LC_TRANS_EXC_CODE);
532
		rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
533
				   (u8 *)__LC_EXC_ACCESS_ID);
534
		rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
535 536 537
				   (u8 *)__LC_OP_ACCESS_ID);
		break;
	case PGM_MONITOR:
538
		rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
539
				  (u16 *)__LC_MON_CLASS_NR);
540
		rc |= put_guest_lc(vcpu, pgm_info.mon_code,
541 542 543
				   (u64 *)__LC_MON_CODE);
		break;
	case PGM_DATA:
544
		rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
545 546 547
				  (u32 *)__LC_DATA_EXC_CODE);
		break;
	case PGM_PROTECTION:
548
		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
549
				  (u64 *)__LC_TRANS_EXC_CODE);
550
		rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
551 552 553 554
				   (u8 *)__LC_EXC_ACCESS_ID);
		break;
	}

555 556
	if (pgm_info.code & PGM_PER) {
		rc |= put_guest_lc(vcpu, pgm_info.per_code,
557
				   (u8 *) __LC_PER_CODE);
558
		rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
559
				   (u8 *)__LC_PER_ATMID);
560
		rc |= put_guest_lc(vcpu, pgm_info.per_address,
561
				   (u64 *) __LC_PER_ADDRESS);
562
		rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
563 564 565
				   (u8 *) __LC_PER_ACCESS_ID);
	}

566
	rc |= put_guest_lc(vcpu, ilc, (u16 *) __LC_PGM_ILC);
567
	rc |= put_guest_lc(vcpu, pgm_info.code,
568 569 570 571 572
			   (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));
573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604
	return rc;
}

static int __must_check __deliver_service(struct kvm_vcpu *vcpu,
					  struct kvm_s390_interrupt_info *inti)
{
	int rc;

	VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
		   inti->ext.ext_params);
	vcpu->stat.deliver_service_signal++;
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
					 inti->ext.ext_params, 0);

	rc  = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
	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);
	return rc;
}

static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu,
					   struct kvm_s390_interrupt_info *inti)
{
	int rc;

	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
					 KVM_S390_INT_PFAULT_DONE, 0,
					 inti->ext.ext_params2);
605

606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666
	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);
	return rc;
}

static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu,
					 struct kvm_s390_interrupt_info *inti)
{
	int rc;

	VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
		   inti->ext.ext_params, inti->ext.ext_params2);
	vcpu->stat.deliver_virtio_interrupt++;
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
					 inti->ext.ext_params,
					 inti->ext.ext_params2);

	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);
	return rc;
}

static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
				     struct kvm_s390_interrupt_info *inti)
{
	int rc;

	VCPU_EVENT(vcpu, 4, "interrupt: I/O %llx", inti->type);
	vcpu->stat.deliver_io_int++;
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
					 ((__u32)inti->io.subchannel_id << 16) |
						inti->io.subchannel_nr,
					 ((__u64)inti->io.io_int_parm << 32) |
						inti->io.io_int_word);

	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));
667 668 669
	return rc;
}

670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711
static int __must_check __deliver_mchk_floating(struct kvm_vcpu *vcpu,
					   struct kvm_s390_interrupt_info *inti)
{
	struct kvm_s390_mchk_info *mchk = &inti->mchk;
	int rc;

	VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx",
		   mchk->mcic);
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_MCHK,
					 mchk->cr14, mchk->mcic);

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

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

static const deliver_irq_t deliver_irq_funcs[] = {
	[IRQ_PEND_MCHK_EX]        = __deliver_machine_check,
	[IRQ_PEND_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_SIGP_STOP]      = __deliver_stop,
	[IRQ_PEND_SET_PREFIX]     = __deliver_set_prefix,
	[IRQ_PEND_PFAULT_INIT]    = __deliver_pfault_init,
};

static int __must_check __deliver_floating_interrupt(struct kvm_vcpu *vcpu,
					   struct kvm_s390_interrupt_info *inti)
712
{
713
	int rc;
714 715 716

	switch (inti->type) {
	case KVM_S390_INT_SERVICE:
717
		rc = __deliver_service(vcpu, inti);
718
		break;
719
	case KVM_S390_INT_PFAULT_DONE:
720
		rc = __deliver_pfault_done(vcpu, inti);
721
		break;
722
	case KVM_S390_INT_VIRTIO:
723
		rc = __deliver_virtio(vcpu, inti);
724
		break;
725
	case KVM_S390_MCHK:
726
		rc = __deliver_mchk_floating(vcpu, inti);
727
		break;
728
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
729
		rc = __deliver_io(vcpu, inti);
730
		break;
731 732 733
	default:
		BUG();
	}
734 735

	return rc;
736 737
}

738 739 740 741 742 743 744 745 746 747 748 749 750 751
/* Check whether SIGP interpretation facility has an external call pending */
int kvm_s390_si_ext_call_pending(struct kvm_vcpu *vcpu)
{
	atomic_t *sigp_ctrl = &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].ctrl;

	if (!psw_extint_disabled(vcpu) &&
	    (vcpu->arch.sie_block->gcr[0] & 0x2000ul) &&
	    (atomic_read(sigp_ctrl) & SIGP_CTRL_C) &&
	    (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND))
		return 1;

	return 0;
}

752
int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
753
{
754 755
	struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
	struct kvm_s390_interrupt_info  *inti;
756
	int rc;
757

758
	rc = !!deliverable_local_irqs(vcpu);
759 760

	if ((!rc) && atomic_read(&fi->active)) {
761
		spin_lock(&fi->lock);
762 763 764 765 766
		list_for_each_entry(inti, &fi->list, list)
			if (__interrupt_is_deliverable(vcpu, inti)) {
				rc = 1;
				break;
			}
767
		spin_unlock(&fi->lock);
768 769
	}

770 771
	if (!rc && kvm_cpu_has_pending_timer(vcpu))
		rc = 1;
772

773 774 775
	if (!rc && kvm_s390_si_ext_call_pending(vcpu))
		rc = 1;

776 777 778
	return rc;
}

779 780
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
781 782 783 784 785 786
	if (!(vcpu->arch.sie_block->ckc <
	      get_tod_clock_fast() + vcpu->arch.sie_block->epoch))
		return 0;
	if (!ckc_interrupts_enabled(vcpu))
		return 0;
	return 1;
787 788
}

789 790 791 792 793 794
int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
{
	u64 now, sltime;

	vcpu->stat.exit_wait_state++;

795 796 797
	/* fast path */
	if (kvm_cpu_has_pending_timer(vcpu) || kvm_arch_vcpu_runnable(vcpu))
		return 0;
798

799 800
	if (psw_interrupts_disabled(vcpu)) {
		VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
801
		return -EOPNOTSUPP; /* disabled wait */
802 803
	}

804
	__set_cpu_idle(vcpu);
805
	if (!ckc_interrupts_enabled(vcpu)) {
806 807 808 809
		VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
		goto no_timer;
	}

810
	now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
811
	sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
812 813
	hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
	VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
814
no_timer:
815
	srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
816
	kvm_vcpu_block(vcpu);
817
	__unset_cpu_idle(vcpu);
818 819
	vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);

820
	hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
821 822 823
	return 0;
}

824 825 826 827 828 829 830 831 832
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);
833
		vcpu->stat.halt_wakeup++;
834 835 836
	}
}

837 838 839 840 841
enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
{
	struct kvm_vcpu *vcpu;

	vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
842
	kvm_s390_vcpu_wakeup(vcpu);
843 844 845

	return HRTIMER_NORESTART;
}
846

847 848 849 850
void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

851
	spin_lock(&li->lock);
852 853 854
	li->pending_irqs = 0;
	bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
	memset(&li->irq, 0, sizeof(li->irq));
855
	spin_unlock(&li->lock);
856 857

	/* clear pending external calls set by sigp interpretation facility */
858
	atomic_clear_mask(CPUSTAT_ECALL_PEND, li->cpuflags);
859 860
	atomic_clear_mask(SIGP_CTRL_C,
			  &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].ctrl);
861 862
}

863
int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
864
{
865 866 867
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
	struct kvm_s390_interrupt_info  *n, *inti = NULL;
868
	deliver_irq_t func;
869
	int deliver;
870
	int rc = 0;
871 872
	unsigned long irq_type;
	unsigned long deliverable_irqs;
873 874 875

	__reset_intercept_indicators(vcpu);

876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896
	/* pending ckc conditions might have been invalidated */
	clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
	if (kvm_cpu_has_pending_timer(vcpu))
		set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);

	do {
		deliverable_irqs = deliverable_local_irqs(vcpu);
		/* bits are in the order of interrupt priority */
		irq_type = find_first_bit(&deliverable_irqs, IRQ_PEND_COUNT);
		if (irq_type == IRQ_PEND_COUNT)
			break;
		func = deliver_irq_funcs[irq_type];
		if (!func) {
			WARN_ON_ONCE(func == NULL);
			clear_bit(irq_type, &li->pending_irqs);
			continue;
		}
		rc = func(vcpu);
	} while (!rc && irq_type != IRQ_PEND_COUNT);

	set_intercept_indicators_local(vcpu);
897

898
	if (!rc && atomic_read(&fi->active)) {
899 900
		do {
			deliver = 0;
901
			spin_lock(&fi->lock);
902 903 904
			list_for_each_entry_safe(inti, n, &fi->list, list) {
				if (__interrupt_is_deliverable(vcpu, inti)) {
					list_del(&inti->list);
J
Jens Freimann 已提交
905
					fi->irq_count--;
906 907 908 909 910 911 912
					deliver = 1;
					break;
				}
				__set_intercept_indicator(vcpu, inti);
			}
			if (list_empty(&fi->list))
				atomic_set(&fi->active, 0);
913
			spin_unlock(&fi->lock);
914
			if (deliver) {
915
				rc = __deliver_floating_interrupt(vcpu, inti);
916 917
				kfree(inti);
			}
918
		} while (!rc && deliver);
919
	}
920 921

	return rc;
922 923
}

924
static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
925 926 927
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

928 929
	li->irq.pgm = irq->u.pgm;
	__set_bit(IRQ_PEND_PROG, &li->pending_irqs);
930 931 932
	return 0;
}

933 934
int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
{
935
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
936
	struct kvm_s390_irq irq;
937 938

	VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
939 940
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT, code,
				   0, 1);
941
	spin_lock(&li->lock);
942 943
	irq.u.pgm.code = code;
	__inject_prog(vcpu, &irq);
944
	BUG_ON(waitqueue_active(li->wq));
945
	spin_unlock(&li->lock);
946 947 948 949 950 951 952
	return 0;
}

int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
			     struct kvm_s390_pgm_info *pgm_info)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
953
	struct kvm_s390_irq irq;
954
	int rc;
955 956 957 958 959

	VCPU_EVENT(vcpu, 3, "inject: prog irq %d (from kernel)",
		   pgm_info->code);
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
				   pgm_info->code, 0, 1);
960
	spin_lock(&li->lock);
961 962
	irq.u.pgm = *pgm_info;
	rc = __inject_prog(vcpu, &irq);
963
	BUG_ON(waitqueue_active(li->wq));
964
	spin_unlock(&li->lock);
965 966 967
	return rc;
}

968
static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
969 970 971
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

972 973 974 975 976 977 978 979
	VCPU_EVENT(vcpu, 3, "inject: external irq params:%x, params2:%llx",
		   irq->u.ext.ext_params, 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, 2);

	li->irq.ext = irq->u.ext;
	set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
980 981 982 983
	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	return 0;
}

984
int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
985 986
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
987
	struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
988 989

	VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
990 991 992 993 994 995
		   irq->u.extcall.code);
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
				   irq->u.extcall.code, 0, 2);

	*extcall = irq->u.extcall;
	__set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
996 997 998 999
	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	return 0;
}

1000
static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1001 1002
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1003
	struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1004 1005

	VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
1006 1007 1008 1009 1010 1011
		   prefix->address);
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
				   prefix->address, 0, 2);

	*prefix = irq->u.prefix;
	set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1012 1013 1014
	return 0;
}

1015
static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1016 1017 1018
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

1019 1020
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0, 2);

1021
	li->action_bits |= ACTION_STOP_ON_STOP;
1022
	set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1023 1024 1025 1026
	return 0;
}

static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1027
				 struct kvm_s390_irq *irq)
1028 1029 1030
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

1031 1032 1033 1034
	VCPU_EVENT(vcpu, 3, "inject: restart type %llx", irq->type);
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0, 2);

	set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1035 1036 1037 1038
	return 0;
}

static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1039
				   struct kvm_s390_irq *irq)
1040 1041
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1042
	struct kvm_s390_emerg_info *emerg = &li->irq.emerg;
1043

1044 1045 1046 1047 1048 1049 1050
	VCPU_EVENT(vcpu, 3, "inject: emergency %u\n",
		   irq->u.emerg.code);
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
				   emerg->code, 0, 2);

	set_bit(emerg->code, li->sigp_emerg_pending);
	set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1051 1052 1053 1054
	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	return 0;
}

1055
static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1056 1057
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1058
	struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1059 1060

	VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx",
1061 1062 1063 1064 1065
		   mchk->mcic);
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
				   mchk->mcic, 2);

	/*
1066 1067 1068 1069 1070 1071
	 * 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
1072
	 */
1073
	mchk->cr14 |= irq->u.mchk.cr14;
1074
	mchk->mcic |= irq->u.mchk.mcic;
1075 1076 1077 1078
	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));
1079 1080 1081 1082
	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);
1083 1084 1085
	return 0;
}

1086
static int __inject_ckc(struct kvm_vcpu *vcpu)
1087 1088 1089
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

1090 1091 1092 1093 1094
	VCPU_EVENT(vcpu, 3, "inject: type %x", KVM_S390_INT_CLOCK_COMP);
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
				   0, 0, 2);

	set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1095 1096 1097 1098
	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	return 0;
}

1099
static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1100 1101 1102
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

1103 1104 1105 1106 1107
	VCPU_EVENT(vcpu, 3, "inject: type %x", KVM_S390_INT_CPU_TIMER);
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
				   0, 0, 2);

	set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1108
	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1109 1110 1111
	return 0;
}

1112

1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127
struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
						    u64 cr6, u64 schid)
{
	struct kvm_s390_float_interrupt *fi;
	struct kvm_s390_interrupt_info *inti, *iter;

	if ((!schid && !cr6) || (schid && cr6))
		return NULL;
	mutex_lock(&kvm->lock);
	fi = &kvm->arch.float_int;
	spin_lock(&fi->lock);
	inti = NULL;
	list_for_each_entry(iter, &fi->list, list) {
		if (!is_ioint(iter->type))
			continue;
C
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1128 1129
		if (cr6 &&
		    ((cr6 & int_word_to_isc_bits(iter->io.io_int_word)) == 0))
1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141
			continue;
		if (schid) {
			if (((schid & 0x00000000ffff0000) >> 16) !=
			    iter->io.subchannel_id)
				continue;
			if ((schid & 0x000000000000ffff) !=
			    iter->io.subchannel_nr)
				continue;
		}
		inti = iter;
		break;
	}
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1142
	if (inti) {
1143
		list_del_init(&inti->list);
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1144 1145
		fi->irq_count--;
	}
1146 1147 1148 1149 1150 1151
	if (list_empty(&fi->list))
		atomic_set(&fi->active, 0);
	spin_unlock(&fi->lock);
	mutex_unlock(&kvm->lock);
	return inti;
}
1152

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1153
static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1154
{
1155 1156
	struct kvm_s390_local_interrupt *li;
	struct kvm_s390_float_interrupt *fi;
1157
	struct kvm_s390_interrupt_info *iter;
1158
	struct kvm_vcpu *dst_vcpu = NULL;
1159
	int sigcpu;
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1160
	int rc = 0;
1161

1162 1163 1164
	mutex_lock(&kvm->lock);
	fi = &kvm->arch.float_int;
	spin_lock(&fi->lock);
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1165 1166 1167 1168 1169
	if (fi->irq_count >= KVM_S390_MAX_FLOAT_IRQS) {
		rc = -EINVAL;
		goto unlock_fi;
	}
	fi->irq_count++;
1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192
	if (!is_ioint(inti->type)) {
		list_add_tail(&inti->list, &fi->list);
	} else {
		u64 isc_bits = int_word_to_isc_bits(inti->io.io_int_word);

		/* Keep I/O interrupts sorted in isc order. */
		list_for_each_entry(iter, &fi->list, list) {
			if (!is_ioint(iter->type))
				continue;
			if (int_word_to_isc_bits(iter->io.io_int_word)
			    <= isc_bits)
				continue;
			break;
		}
		list_add_tail(&inti->list, &iter->list);
	}
	atomic_set(&fi->active, 1);
	sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
	if (sigcpu == KVM_MAX_VCPUS) {
		do {
			sigcpu = fi->next_rr_cpu++;
			if (sigcpu == KVM_MAX_VCPUS)
				sigcpu = fi->next_rr_cpu = 0;
1193
		} while (kvm_get_vcpu(kvm, sigcpu) == NULL);
1194
	}
1195 1196
	dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
	li = &dst_vcpu->arch.local_int;
1197
	spin_lock(&li->lock);
1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208
	switch (inti->type) {
	case KVM_S390_MCHK:
		atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
		break;
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
		atomic_set_mask(CPUSTAT_IO_INT, li->cpuflags);
		break;
	default:
		atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
		break;
	}
1209
	spin_unlock(&li->lock);
1210
	kvm_s390_vcpu_wakeup(kvm_get_vcpu(kvm, sigcpu));
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1211
unlock_fi:
1212 1213
	spin_unlock(&fi->lock);
	mutex_unlock(&kvm->lock);
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	return rc;
1215 1216 1217 1218 1219 1220 1221
}

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

1222 1223 1224 1225
	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	if (!inti)
		return -ENOMEM;

1226 1227
	inti->type = s390int->type;
	switch (inti->type) {
1228
	case KVM_S390_INT_VIRTIO:
1229
		VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1230 1231 1232 1233 1234 1235 1236 1237
			 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, 5, "inject: sclp parm:%x", s390int->parm);
		inti->ext.ext_params = s390int->parm;
		break;
1238 1239 1240 1241
	case KVM_S390_INT_PFAULT_DONE:
		inti->type = s390int->type;
		inti->ext.ext_params2 = s390int->parm64;
		break;
1242 1243 1244 1245 1246 1247
	case KVM_S390_MCHK:
		VM_EVENT(kvm, 5, "inject: machine check parm64:%llx",
			 s390int->parm64);
		inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
		inti->mchk.mcic = s390int->parm64;
		break;
1248
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1249
		if (inti->type & IOINT_AI_MASK)
1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260
			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;
1261 1262 1263 1264
	default:
		kfree(inti);
		return -EINVAL;
	}
1265 1266
	trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
				 2);
1267

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Jens Freimann 已提交
1268
	return __inject_vm(kvm, inti);
1269 1270
}

1271 1272 1273 1274 1275 1276
void kvm_s390_reinject_io_int(struct kvm *kvm,
			      struct kvm_s390_interrupt_info *inti)
{
	__inject_vm(kvm, inti);
}

1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307
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_INT_EXTERNAL_CALL:
		if (irq->u.extcall.code & 0xffff0000)
			return -EINVAL;
		irq->u.extcall.code = s390int->parm;
		break;
	case KVM_S390_INT_EMERGENCY:
		if (irq->u.emerg.code & 0xffff0000)
			return -EINVAL;
		irq->u.emerg.code = s390int->parm;
		break;
	case KVM_S390_MCHK:
		irq->u.mchk.mcic = s390int->parm64;
		break;
	}
	return 0;
}

int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1308
{
1309 1310
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	int rc;
1311

1312
	spin_lock(&li->lock);
1313
	switch (irq->type) {
1314 1315
	case KVM_S390_PROGRAM_INT:
		VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
1316 1317
			   irq->u.pgm.code);
		rc = __inject_prog(vcpu, irq);
1318
		break;
1319
	case KVM_S390_SIGP_SET_PREFIX:
1320
		rc = __inject_set_prefix(vcpu, irq);
1321
		break;
1322
	case KVM_S390_SIGP_STOP:
1323
		rc = __inject_sigp_stop(vcpu, irq);
1324
		break;
1325
	case KVM_S390_RESTART:
1326
		rc = __inject_sigp_restart(vcpu, irq);
1327
		break;
1328
	case KVM_S390_INT_CLOCK_COMP:
1329
		rc = __inject_ckc(vcpu);
1330
		break;
1331
	case KVM_S390_INT_CPU_TIMER:
1332
		rc = __inject_cpu_timer(vcpu);
1333
		break;
1334
	case KVM_S390_INT_EXTERNAL_CALL:
1335
		rc = __inject_extcall(vcpu, irq);
1336
		break;
1337
	case KVM_S390_INT_EMERGENCY:
1338
		rc = __inject_sigp_emergency(vcpu, irq);
1339
		break;
1340
	case KVM_S390_MCHK:
1341
		rc = __inject_mchk(vcpu, irq);
1342
		break;
1343
	case KVM_S390_INT_PFAULT_INIT:
1344
		rc = __inject_pfault_init(vcpu, irq);
1345
		break;
1346 1347
	case KVM_S390_INT_VIRTIO:
	case KVM_S390_INT_SERVICE:
1348
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1349
	default:
1350
		rc = -EINVAL;
1351
	}
1352
	spin_unlock(&li->lock);
1353 1354 1355
	if (!rc)
		kvm_s390_vcpu_wakeup(vcpu);
	return rc;
1356
}
1357

1358
void kvm_s390_clear_float_irqs(struct kvm *kvm)
1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369
{
	struct kvm_s390_float_interrupt *fi;
	struct kvm_s390_interrupt_info	*n, *inti = NULL;

	mutex_lock(&kvm->lock);
	fi = &kvm->arch.float_int;
	spin_lock(&fi->lock);
	list_for_each_entry_safe(inti, n, &fi->list, list) {
		list_del(&inti->list);
		kfree(inti);
	}
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1370
	fi->irq_count = 0;
1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383
	atomic_set(&fi->active, 0);
	spin_unlock(&fi->lock);
	mutex_unlock(&kvm->lock);
}

static inline int copy_irq_to_user(struct kvm_s390_interrupt_info *inti,
				   u8 *addr)
{
	struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
	struct kvm_s390_irq irq = {0};

	irq.type = inti->type;
	switch (inti->type) {
1384 1385
	case KVM_S390_INT_PFAULT_INIT:
	case KVM_S390_INT_PFAULT_DONE:
1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464
	case KVM_S390_INT_VIRTIO:
	case KVM_S390_INT_SERVICE:
		irq.u.ext = inti->ext;
		break;
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
		irq.u.io = inti->io;
		break;
	case KVM_S390_MCHK:
		irq.u.mchk = inti->mchk;
		break;
	default:
		return -EINVAL;
	}

	if (copy_to_user(uptr, &irq, sizeof(irq)))
		return -EFAULT;

	return 0;
}

static int get_all_floating_irqs(struct kvm *kvm, __u8 *buf, __u64 len)
{
	struct kvm_s390_interrupt_info *inti;
	struct kvm_s390_float_interrupt *fi;
	int ret = 0;
	int n = 0;

	mutex_lock(&kvm->lock);
	fi = &kvm->arch.float_int;
	spin_lock(&fi->lock);

	list_for_each_entry(inti, &fi->list, list) {
		if (len < sizeof(struct kvm_s390_irq)) {
			/* signal userspace to try again */
			ret = -ENOMEM;
			break;
		}
		ret = copy_irq_to_user(inti, buf);
		if (ret)
			break;
		buf += sizeof(struct kvm_s390_irq);
		len -= sizeof(struct kvm_s390_irq);
		n++;
	}

	spin_unlock(&fi->lock);
	mutex_unlock(&kvm->lock);

	return ret < 0 ? ret : n;
}

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

	switch (attr->group) {
	case KVM_DEV_FLIC_GET_ALL_IRQS:
		r = get_all_floating_irqs(dev->kvm, (u8 *) attr->addr,
					  attr->attr);
		break;
	default:
		r = -EINVAL;
	}

	return r;
}

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

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

	switch (inti->type) {
1465 1466
	case KVM_S390_INT_PFAULT_INIT:
	case KVM_S390_INT_PFAULT_DONE:
1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514
	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;
		}
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1515 1516 1517 1518 1519
		r = __inject_vm(dev->kvm, inti);
		if (r) {
			kfree(inti);
			return r;
		}
1520 1521 1522 1523 1524 1525 1526
		len -= sizeof(struct kvm_s390_irq);
		attr->addr += sizeof(struct kvm_s390_irq);
	}

	return r;
}

1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592
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;
1593
	map->addr = gmap_translate(kvm->arch.gmap, addr);
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	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;
}

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static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
	int r = 0;
1695 1696
	unsigned int i;
	struct kvm_vcpu *vcpu;
1697 1698 1699 1700 1701 1702

	switch (attr->group) {
	case KVM_DEV_FLIC_ENQUEUE:
		r = enqueue_floating_irq(dev, attr);
		break;
	case KVM_DEV_FLIC_CLEAR_IRQS:
1703
		kvm_s390_clear_float_irqs(dev->kvm);
1704
		break;
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	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;
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	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;
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	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,
};
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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;
}

1848
int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
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
			  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;
}