interrupt.c 61.7 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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/* handle external calls via sigp interpretation facility */
static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
{
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	int c, scn;

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	read_lock(&vcpu->kvm->arch.sca_lock);
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	if (vcpu->kvm->arch.use_esca) {
		struct esca_block *sca = vcpu->kvm->arch.sca;
		union esca_sigp_ctrl sigp_ctrl =
			sca->cpu[vcpu->vcpu_id].sigp_ctrl;

		c = sigp_ctrl.c;
		scn = sigp_ctrl.scn;
	} else {
		struct bsca_block *sca = vcpu->kvm->arch.sca;
		union bsca_sigp_ctrl sigp_ctrl =
			sca->cpu[vcpu->vcpu_id].sigp_ctrl;

		c = sigp_ctrl.c;
		scn = sigp_ctrl.scn;
	}
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	read_unlock(&vcpu->kvm->arch.sca_lock);
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	if (src_id)
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		*src_id = scn;
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	return c && atomic_read(&vcpu->arch.sie_block->cpuflags) &
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			CPUSTAT_ECALL_PEND;
}

static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
{
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	int expect, rc;
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	read_lock(&vcpu->kvm->arch.sca_lock);
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	if (vcpu->kvm->arch.use_esca) {
		struct esca_block *sca = vcpu->kvm->arch.sca;
		union esca_sigp_ctrl *sigp_ctrl =
			&(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
		union esca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;

		new_val.scn = src_id;
		new_val.c = 1;
		old_val.c = 0;

		expect = old_val.value;
		rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
	} else {
		struct bsca_block *sca = vcpu->kvm->arch.sca;
		union bsca_sigp_ctrl *sigp_ctrl =
			&(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
		union bsca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
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		new_val.scn = src_id;
		new_val.c = 1;
		old_val.c = 0;

		expect = old_val.value;
		rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
	}
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	read_unlock(&vcpu->kvm->arch.sca_lock);
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	if (rc != expect) {
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		/* another external call is pending */
		return -EBUSY;
	}
	atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
	return 0;
}

static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
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	int rc, expect;
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	atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags);
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	read_lock(&vcpu->kvm->arch.sca_lock);
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	if (vcpu->kvm->arch.use_esca) {
		struct esca_block *sca = vcpu->kvm->arch.sca;
		union esca_sigp_ctrl *sigp_ctrl =
			&(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
		union esca_sigp_ctrl old = *sigp_ctrl;

		expect = old.value;
		rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
	} else {
		struct bsca_block *sca = vcpu->kvm->arch.sca;
		union bsca_sigp_ctrl *sigp_ctrl =
			&(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
		union bsca_sigp_ctrl old = *sigp_ctrl;

		expect = old.value;
		rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
	}
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	read_unlock(&vcpu->kvm->arch.sca_lock);
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	WARN_ON(rc != expect); /* cannot clear? */
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}

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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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	if (vcpu->arch.sie_block->ckc >= kvm_s390_get_tod_clock_fast(vcpu->kvm))
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		return 0;
	return ckc_interrupts_enabled(vcpu);
}

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

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

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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;
531
	int rc;
532 533 534 535 536 537 538 539
	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);
540

541
	VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
542
	vcpu->stat.deliver_emergency_signal++;
543 544
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
					 cpu_addr, 0);
545 546 547

	rc  = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
			   (u16 *)__LC_EXT_INT_CODE);
548
	rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
549 550 551 552
	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));
553
	return rc ? -EFAULT : 0;
554 555
}

556
static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
557
{
558 559
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	struct kvm_s390_extcall_info extcall;
560 561
	int rc;

562 563 564 565 566 567
	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);

568
	VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
569 570 571
	vcpu->stat.deliver_external_call++;
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
					 KVM_S390_INT_EXTERNAL_CALL,
572
					 extcall.code, 0);
573 574 575

	rc  = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
			   (u16 *)__LC_EXT_INT_CODE);
576
	rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
577 578 579 580
	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));
581
	return rc ? -EFAULT : 0;
582 583
}

584
static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
585
{
586 587
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	struct kvm_s390_pgm_info pgm_info;
588
	int rc = 0, nullifying = false;
589
	u16 ilc = get_ilc(vcpu);
590

591 592 593 594 595 596
	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);

597
	VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilc:%d",
598
		   pgm_info.code, ilc);
599 600
	vcpu->stat.deliver_program_int++;
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
601
					 pgm_info.code, 0);
602

603
	switch (pgm_info.code & ~PGM_PER) {
604 605 606 607 608 609 610 611 612
	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:
613 614
		nullifying = true;
		/* fall through */
615
	case PGM_SPACE_SWITCH:
616
		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
617 618 619 620 621 622 623 624
				  (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:
625
		rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
626
				  (u8 *)__LC_EXC_ACCESS_ID);
627
		nullifying = true;
628 629 630 631 632 633 634
		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:
635
		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
636
				  (u64 *)__LC_TRANS_EXC_CODE);
637
		rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
638
				   (u8 *)__LC_EXC_ACCESS_ID);
639
		rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
640
				   (u8 *)__LC_OP_ACCESS_ID);
641
		nullifying = true;
642 643
		break;
	case PGM_MONITOR:
644
		rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
645
				  (u16 *)__LC_MON_CLASS_NR);
646
		rc |= put_guest_lc(vcpu, pgm_info.mon_code,
647 648
				   (u64 *)__LC_MON_CODE);
		break;
E
Eric Farman 已提交
649
	case PGM_VECTOR_PROCESSING:
650
	case PGM_DATA:
651
		rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
652 653 654
				  (u32 *)__LC_DATA_EXC_CODE);
		break;
	case PGM_PROTECTION:
655
		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
656
				  (u64 *)__LC_TRANS_EXC_CODE);
657
		rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
658 659
				   (u8 *)__LC_EXC_ACCESS_ID);
		break;
660 661 662 663 664 665 666 667 668
	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;
669 670
	}

671 672
	if (pgm_info.code & PGM_PER) {
		rc |= put_guest_lc(vcpu, pgm_info.per_code,
673
				   (u8 *) __LC_PER_CODE);
674
		rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
675
				   (u8 *)__LC_PER_ATMID);
676
		rc |= put_guest_lc(vcpu, pgm_info.per_address,
677
				   (u64 *) __LC_PER_ADDRESS);
678
		rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
679 680 681
				   (u8 *) __LC_PER_ACCESS_ID);
	}

682 683 684
	if (nullifying && vcpu->arch.sie_block->icptcode == ICPT_INST)
		kvm_s390_rewind_psw(vcpu, ilc);

685
	rc |= put_guest_lc(vcpu, ilc, (u16 *) __LC_PGM_ILC);
686 687
	rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
				 (u64 *) __LC_LAST_BREAK);
688
	rc |= put_guest_lc(vcpu, pgm_info.code,
689 690 691 692 693
			   (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));
694
	return rc ? -EFAULT : 0;
695 696
}

697
static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
698
{
699 700 701 702 703 704 705 706 707 708 709 710 711
	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);
712

713
	VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
714
		   ext.ext_params);
715
	vcpu->stat.deliver_service_signal++;
716 717
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
					 ext.ext_params, 0);
718 719

	rc  = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
720
	rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
721 722 723 724
	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));
725
	rc |= put_guest_lc(vcpu, ext.ext_params,
726
			   (u32 *)__LC_EXT_PARAMS);
727

728
	return rc ? -EFAULT : 0;
729 730
}

731
static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
732
{
733 734 735
	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	struct kvm_s390_interrupt_info *inti;
	int rc = 0;
736

737 738 739 740 741 742 743 744 745 746 747
	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);
748

749
	if (inti) {
750 751 752 753 754 755
		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);

756 757 758 759 760 761 762 763 764 765 766 767 768 769
		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);
	}
770
	return rc ? -EFAULT : 0;
771 772
}

773
static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
774
{
775 776 777
	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	struct kvm_s390_interrupt_info *inti;
	int rc = 0;
778

779 780 781 782 783 784
	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,
785
			   "deliver: virtio parm: 0x%x,parm64: 0x%llx",
786 787 788 789 790 791 792 793 794 795 796 797
			   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);
798

799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815
	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);
	}
816
	return rc ? -EFAULT : 0;
817 818 819
}

static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
820
				     unsigned long irq_type)
821
{
822 823 824 825
	struct list_head *isc_list;
	struct kvm_s390_float_interrupt *fi;
	struct kvm_s390_interrupt_info *inti = NULL;
	int rc = 0;
826

827
	fi = &vcpu->kvm->arch.float_int;
828

829 830 831 832 833 834
	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) {
835
		VCPU_EVENT(vcpu, 4, "deliver: I/O 0x%llx", inti->type);
836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866
		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);
	}
867

868
	return rc ? -EFAULT : 0;
869 870 871 872 873 874
}

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

static const deliver_irq_t deliver_irq_funcs[] = {
	[IRQ_PEND_MCHK_EX]        = __deliver_machine_check,
875
	[IRQ_PEND_MCHK_REP]       = __deliver_machine_check,
876 877 878 879 880 881 882 883
	[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,
884 885 886
	[IRQ_PEND_EXT_SERVICE]    = __deliver_service,
	[IRQ_PEND_PFAULT_DONE]    = __deliver_pfault_done,
	[IRQ_PEND_VIRTIO]         = __deliver_virtio,
887 888
};

889 890
/* Check whether an external call is pending (deliverable or not) */
int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
891
{
892
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
893

894
	if (!sclp.has_sigpif)
895
		return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
896

897
	return sca_ext_call_pending(vcpu, NULL);
898 899
}

900
int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
901
{
902 903
	if (deliverable_irqs(vcpu))
		return 1;
904

905 906
	if (kvm_cpu_has_pending_timer(vcpu))
		return 1;
907

908
	/* external call pending and deliverable */
909
	if (kvm_s390_ext_call_pending(vcpu) &&
910 911
	    !psw_extint_disabled(vcpu) &&
	    (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
912
		return 1;
913

914 915 916
	if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
		return 1;
	return 0;
917 918
}

919 920
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
921
	return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
922 923
}

924 925 926 927 928 929
int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
{
	u64 now, sltime;

	vcpu->stat.exit_wait_state++;

930
	/* fast path */
931
	if (kvm_arch_vcpu_runnable(vcpu))
932
		return 0;
933

934 935
	if (psw_interrupts_disabled(vcpu)) {
		VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
936
		return -EOPNOTSUPP; /* disabled wait */
937 938
	}

939
	if (!ckc_interrupts_enabled(vcpu)) {
940
		VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
941
		__set_cpu_idle(vcpu);
942 943 944
		goto no_timer;
	}

945
	now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
946
	sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
947 948 949 950 951 952

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

	__set_cpu_idle(vcpu);
953
	hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
954
	VCPU_EVENT(vcpu, 4, "enabled wait via clock comparator: %llu ns", sltime);
955
no_timer:
956
	srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
957
	kvm_vcpu_block(vcpu);
958
	__unset_cpu_idle(vcpu);
959 960
	vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);

961
	hrtimer_cancel(&vcpu->arch.ckc_timer);
962 963 964
	return 0;
}

965 966 967 968 969 970 971 972 973
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);
974
		vcpu->stat.halt_wakeup++;
975 976 977
	}
}

978 979 980
enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
{
	struct kvm_vcpu *vcpu;
981
	u64 now, sltime;
982 983

	vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
984
	now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
985
	sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
986

987 988 989 990 991 992 993 994
	/*
	 * 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);
995 996
	return HRTIMER_NORESTART;
}
997

998 999 1000 1001
void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

1002
	spin_lock(&li->lock);
1003 1004 1005
	li->pending_irqs = 0;
	bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
	memset(&li->irq, 0, sizeof(li->irq));
1006
	spin_unlock(&li->lock);
1007

1008
	sca_clear_ext_call(vcpu);
1009 1010
}

1011
int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
1012
{
1013
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1014
	deliver_irq_t func;
1015
	int rc = 0;
1016
	unsigned long irq_type;
1017
	unsigned long irqs;
1018 1019 1020

	__reset_intercept_indicators(vcpu);

1021 1022
	/* pending ckc conditions might have been invalidated */
	clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1023
	if (ckc_irq_pending(vcpu))
1024 1025
		set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);

1026 1027 1028 1029 1030
	/* 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);

1031
	while ((irqs = deliverable_irqs(vcpu)) && !rc) {
1032
		/* bits are in the order of interrupt priority */
1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043
		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);
1044
		}
1045
	}
1046

1047
	set_intercept_indicators(vcpu);
1048 1049

	return rc;
1050 1051
}

1052
static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1053 1054 1055
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

1056 1057 1058 1059
	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);

1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079
	if (irq->u.pgm.code == PGM_PER) {
		li->irq.pgm.code |= PGM_PER;
		/* only modify PER related information */
		li->irq.pgm.per_address = irq->u.pgm.per_address;
		li->irq.pgm.per_code = irq->u.pgm.per_code;
		li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
		li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
	} else if (!(irq->u.pgm.code & PGM_PER)) {
		li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
				   irq->u.pgm.code;
		/* only modify non-PER information */
		li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
		li->irq.pgm.mon_code = irq->u.pgm.mon_code;
		li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
		li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
		li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
		li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
	} else {
		li->irq.pgm = irq->u.pgm;
	}
1080
	set_bit(IRQ_PEND_PROG, &li->pending_irqs);
1081 1082 1083
	return 0;
}

1084
static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1085 1086 1087
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

1088 1089
	VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
		   irq->u.ext.ext_params2);
1090 1091
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
				   irq->u.ext.ext_params,
1092
				   irq->u.ext.ext_params2);
1093 1094 1095

	li->irq.ext = irq->u.ext;
	set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1096
	atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1097 1098 1099
	return 0;
}

1100
static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1101 1102
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1103
	struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1104
	uint16_t src_id = irq->u.extcall.code;
1105

1106
	VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1107
		   src_id);
1108
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1109
				   src_id, 0);
1110 1111

	/* sending vcpu invalid */
1112
	if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1113 1114
		return -EINVAL;

1115
	if (sclp.has_sigpif)
1116
		return sca_inject_ext_call(vcpu, src_id);
1117

1118
	if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1119
		return -EBUSY;
1120
	*extcall = irq->u.extcall;
1121
	atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1122 1123 1124
	return 0;
}

1125
static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1126 1127
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1128
	struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1129

1130
	VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1131
		   irq->u.prefix.address);
1132
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1133
				   irq->u.prefix.address, 0);
1134

1135 1136 1137
	if (!is_vcpu_stopped(vcpu))
		return -EBUSY;

1138 1139
	*prefix = irq->u.prefix;
	set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1140 1141 1142
	return 0;
}

1143
#define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1144
static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1145 1146
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1147
	struct kvm_s390_stop_info *stop = &li->irq.stop;
1148
	int rc = 0;
1149

1150
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1151

1152 1153 1154
	if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
		return -EINVAL;

1155 1156 1157 1158 1159 1160 1161 1162 1163
	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;
1164
	stop->flags = irq->u.stop.flags;
1165
	__set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1166 1167 1168 1169
	return 0;
}

static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1170
				 struct kvm_s390_irq *irq)
1171 1172 1173
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

1174
	VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1175
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1176 1177

	set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1178 1179 1180 1181
	return 0;
}

static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1182
				   struct kvm_s390_irq *irq)
1183 1184 1185
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

1186
	VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1187 1188
		   irq->u.emerg.code);
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1189
				   irq->u.emerg.code, 0);
1190

1191 1192 1193 1194
	/* sending vcpu invalid */
	if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
		return -EINVAL;

1195
	set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1196
	set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1197
	atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1198 1199 1200
	return 0;
}

1201
static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1202 1203
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1204
	struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1205

1206
	VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1207
		   irq->u.mchk.mcic);
1208
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1209
				   irq->u.mchk.mcic);
1210 1211

	/*
1212 1213 1214 1215 1216 1217
	 * 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
1218
	 */
1219
	mchk->cr14 |= irq->u.mchk.cr14;
1220
	mchk->mcic |= irq->u.mchk.mcic;
1221 1222 1223 1224
	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));
1225 1226 1227 1228
	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);
1229 1230 1231
	return 0;
}

1232
static int __inject_ckc(struct kvm_vcpu *vcpu)
1233 1234 1235
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

1236
	VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1237
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1238
				   0, 0);
1239 1240

	set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1241
	atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1242 1243 1244
	return 0;
}

1245
static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1246 1247 1248
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

1249
	VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1250
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1251
				   0, 0);
1252 1253

	set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1254
	atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1255 1256 1257
	return 0;
}

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
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;
}
1283

1284 1285 1286 1287
/*
 * 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).
 */
1288
struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 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 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379
						    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)
1380 1381
{
	struct kvm_s390_float_interrupt *fi;
1382 1383
	struct list_head *list;
	int isc;
1384 1385 1386

	fi = &kvm->arch.float_int;
	spin_lock(&fi->lock);
1387 1388 1389
	if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
		spin_unlock(&fi->lock);
		return -EBUSY;
J
Jens Freimann 已提交
1390
	}
1391 1392 1393 1394 1395 1396
	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);
1397
	spin_unlock(&fi->lock);
1398
	return 0;
1399
}
1400

1401 1402 1403 1404
/*
 * Find a destination VCPU for a floating irq and kick it.
 */
static void __floating_irq_kick(struct kvm *kvm, u64 type)
1405
{
1406
	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1407
	struct kvm_s390_local_interrupt *li;
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
	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:
1433
		atomic_or(CPUSTAT_STOP_INT, li->cpuflags);
1434 1435
		break;
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1436
		atomic_or(CPUSTAT_IO_INT, li->cpuflags);
1437 1438
		break;
	default:
1439
		atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1440 1441 1442 1443 1444 1445 1446 1447
		break;
	}
	spin_unlock(&li->lock);
	kvm_s390_vcpu_wakeup(dst_vcpu);
}

static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
{
1448 1449
	u64 type = READ_ONCE(inti->type);
	int rc;
1450

1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467
	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
1468
		rc = -EINVAL;
1469
	}
1470 1471 1472
	if (rc)
		return rc;

1473
	__floating_irq_kick(kvm, type);
1474
	return 0;
1475 1476 1477 1478 1479 1480
}

int kvm_s390_inject_vm(struct kvm *kvm,
		       struct kvm_s390_interrupt *s390int)
{
	struct kvm_s390_interrupt_info *inti;
1481
	int rc;
1482

1483 1484 1485 1486
	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	if (!inti)
		return -ENOMEM;

1487 1488
	inti->type = s390int->type;
	switch (inti->type) {
1489
	case KVM_S390_INT_VIRTIO:
1490
		VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1491 1492 1493 1494 1495
			 s390int->parm, s390int->parm64);
		inti->ext.ext_params = s390int->parm;
		inti->ext.ext_params2 = s390int->parm64;
		break;
	case KVM_S390_INT_SERVICE:
1496
		VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1497 1498
		inti->ext.ext_params = s390int->parm;
		break;
1499 1500 1501
	case KVM_S390_INT_PFAULT_DONE:
		inti->ext.ext_params2 = s390int->parm64;
		break;
1502
	case KVM_S390_MCHK:
1503
		VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1504 1505 1506 1507
			 s390int->parm64);
		inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
		inti->mchk.mcic = s390int->parm64;
		break;
1508
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1509
		if (inti->type & KVM_S390_INT_IO_AI_MASK)
1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520
			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;
1521 1522 1523 1524
	default:
		kfree(inti);
		return -EINVAL;
	}
1525 1526
	trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
				 2);
1527

1528 1529 1530 1531
	rc = __inject_vm(kvm, inti);
	if (rc)
		kfree(inti);
	return rc;
1532 1533
}

1534
int kvm_s390_reinject_io_int(struct kvm *kvm,
1535 1536
			      struct kvm_s390_interrupt_info *inti)
{
1537
	return __inject_vm(kvm, inti);
1538 1539
}

1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552
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;
1553 1554 1555
	case KVM_S390_SIGP_STOP:
		irq->u.stop.flags = s390int->parm;
		break;
1556
	case KVM_S390_INT_EXTERNAL_CALL:
1557
		if (s390int->parm & 0xffff0000)
1558 1559 1560 1561
			return -EINVAL;
		irq->u.extcall.code = s390int->parm;
		break;
	case KVM_S390_INT_EMERGENCY:
1562
		if (s390int->parm & 0xffff0000)
1563 1564 1565 1566 1567 1568 1569 1570 1571 1572
			return -EINVAL;
		irq->u.emerg.code = s390int->parm;
		break;
	case KVM_S390_MCHK:
		irq->u.mchk.mcic = s390int->parm64;
		break;
	}
	return 0;
}

1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589
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);
}

1590
static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1591
{
1592
	int rc;
1593

1594
	switch (irq->type) {
1595
	case KVM_S390_PROGRAM_INT:
1596
		rc = __inject_prog(vcpu, irq);
1597
		break;
1598
	case KVM_S390_SIGP_SET_PREFIX:
1599
		rc = __inject_set_prefix(vcpu, irq);
1600
		break;
1601
	case KVM_S390_SIGP_STOP:
1602
		rc = __inject_sigp_stop(vcpu, irq);
1603
		break;
1604
	case KVM_S390_RESTART:
1605
		rc = __inject_sigp_restart(vcpu, irq);
1606
		break;
1607
	case KVM_S390_INT_CLOCK_COMP:
1608
		rc = __inject_ckc(vcpu);
1609
		break;
1610
	case KVM_S390_INT_CPU_TIMER:
1611
		rc = __inject_cpu_timer(vcpu);
1612
		break;
1613
	case KVM_S390_INT_EXTERNAL_CALL:
1614
		rc = __inject_extcall(vcpu, irq);
1615
		break;
1616
	case KVM_S390_INT_EMERGENCY:
1617
		rc = __inject_sigp_emergency(vcpu, irq);
1618
		break;
1619
	case KVM_S390_MCHK:
1620
		rc = __inject_mchk(vcpu, irq);
1621
		break;
1622
	case KVM_S390_INT_PFAULT_INIT:
1623
		rc = __inject_pfault_init(vcpu, irq);
1624
		break;
1625 1626
	case KVM_S390_INT_VIRTIO:
	case KVM_S390_INT_SERVICE:
1627
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1628
	default:
1629
		rc = -EINVAL;
1630
	}
1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641

	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);
1642
	spin_unlock(&li->lock);
1643 1644 1645
	if (!rc)
		kvm_s390_vcpu_wakeup(vcpu);
	return rc;
1646
}
1647

1648
static inline void clear_irq_list(struct list_head *_list)
1649
{
1650
	struct kvm_s390_interrupt_info *inti, *n;
1651

1652
	list_for_each_entry_safe(inti, n, _list, list) {
1653 1654 1655 1656 1657
		list_del(&inti->list);
		kfree(inti);
	}
}

1658 1659
static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
		       struct kvm_s390_irq *irq)
1660
{
1661
	irq->type = inti->type;
1662
	switch (inti->type) {
1663 1664
	case KVM_S390_INT_PFAULT_INIT:
	case KVM_S390_INT_PFAULT_DONE:
1665
	case KVM_S390_INT_VIRTIO:
1666
		irq->u.ext = inti->ext;
1667 1668
		break;
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1669
		irq->u.io = inti->io;
1670 1671 1672 1673
		break;
	}
}

1674 1675 1676 1677 1678 1679
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);
1680 1681 1682
	fi->pending_irqs = 0;
	memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
	memset(&fi->mchk, 0, sizeof(fi->mchk));
1683 1684 1685 1686 1687 1688 1689
	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);
};

1690
static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1691 1692 1693
{
	struct kvm_s390_interrupt_info *inti;
	struct kvm_s390_float_interrupt *fi;
1694
	struct kvm_s390_irq *buf;
1695
	struct kvm_s390_irq *irq;
1696
	int max_irqs;
1697 1698
	int ret = 0;
	int n = 0;
1699
	int i;
1700

1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714
	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);

1715 1716
	fi = &kvm->arch.float_int;
	spin_lock(&fi->lock);
1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728
	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)) {
1729
		if (n == max_irqs) {
1730 1731
			/* signal userspace to try again */
			ret = -ENOMEM;
1732
			goto out;
1733
		}
1734 1735 1736
		irq = (struct kvm_s390_irq *) &buf[n];
		irq->type = KVM_S390_INT_SERVICE;
		irq->u.ext = fi->srv_signal;
1737 1738
		n++;
	}
1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751
	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:
1752
	spin_unlock(&fi->lock);
1753 1754 1755 1756 1757
	if (!ret && n > 0) {
		if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
			ret = -EFAULT;
	}
	vfree(buf);
1758 1759 1760 1761 1762 1763 1764 1765 1766 1767

	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:
1768
		r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789
					  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) {
1790 1791
	case KVM_S390_INT_PFAULT_INIT:
	case KVM_S390_INT_PFAULT_DONE:
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 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839
	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
1840 1841 1842 1843 1844
		r = __inject_vm(dev->kvm, inti);
		if (r) {
			kfree(inti);
			return r;
		}
1845 1846 1847 1848 1849 1850 1851
		len -= sizeof(struct kvm_s390_irq);
		attr->addr += sizeof(struct kvm_s390_irq);
	}

	return r;
}

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
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;
1918
	map->addr = gmap_translate(kvm->arch.gmap, addr);
1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 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 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
	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;
}

2017 2018 2019
static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
	int r = 0;
2020 2021
	unsigned int i;
	struct kvm_vcpu *vcpu;
2022 2023 2024 2025 2026 2027

	switch (attr->group) {
	case KVM_DEV_FLIC_ENQUEUE:
		r = enqueue_floating_irq(dev, attr);
		break;
	case KVM_DEV_FLIC_CLEAR_IRQS:
2028
		kvm_s390_clear_float_irqs(dev->kvm);
2029
		break;
2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043
	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;
2044 2045 2046 2047 2048 2049
	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;
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
	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,
};
2081 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 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

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;
}

2173
int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
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			  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;
}
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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)
{
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	int scn;
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	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);
		}
	}

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	if (sca_ext_call_pending(vcpu, &scn)) {
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		if (n + sizeof(irq) > len)
			return -ENOBUFS;
		memset(&irq, 0, sizeof(irq));
		irq.type = KVM_S390_INT_EXTERNAL_CALL;
2330
		irq.u.extcall.code = scn;
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		if (copy_to_user(&buf[n], &irq, sizeof(irq)))
			return -EFAULT;
		n += sizeof(irq);
	}

	return n;
}