interrupt.c 61.8 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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	if (!(atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND))
		return 0;

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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;
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}

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)
{
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	if (!cpu_timer_interrupts_enabled(vcpu))
		return 0;
	return kvm_s390_get_cpu_timer(vcpu) >> 63;
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}

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

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static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
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{
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	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	struct kvm_s390_prefix_info prefix;

	spin_lock(&li->lock);
	prefix = li->irq.prefix;
	li->irq.prefix.address = 0;
	clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
	spin_unlock(&li->lock);
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	vcpu->stat.deliver_prefix_signal++;
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
					 KVM_S390_SIGP_SET_PREFIX,
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					 prefix.address, 0);
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	kvm_s390_set_prefix(vcpu, prefix.address);
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	return 0;
}

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

	spin_lock(&li->lock);
	cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
	clear_bit(cpu_addr, li->sigp_emerg_pending);
	if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
		clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
	spin_unlock(&li->lock);
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527
	VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
528
	vcpu->stat.deliver_emergency_signal++;
529 530
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
					 cpu_addr, 0);
531 532 533

	rc  = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
			   (u16 *)__LC_EXT_INT_CODE);
534
	rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
535 536 537 538
	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));
539
	return rc ? -EFAULT : 0;
540 541
}

542
static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
543
{
544 545
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	struct kvm_s390_extcall_info extcall;
546 547
	int rc;

548 549 550 551 552 553
	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);

554
	VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
555 556 557
	vcpu->stat.deliver_external_call++;
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
					 KVM_S390_INT_EXTERNAL_CALL,
558
					 extcall.code, 0);
559 560 561

	rc  = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
			   (u16 *)__LC_EXT_INT_CODE);
562
	rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
563 564 565 566
	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));
567
	return rc ? -EFAULT : 0;
568 569
}

570
static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
571
{
572 573
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	struct kvm_s390_pgm_info pgm_info;
574
	int rc = 0, nullifying = false;
575
	u16 ilen;
576

577 578 579 580 581 582
	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);

583
	ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
584 585
	VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
		   pgm_info.code, ilen);
586 587
	vcpu->stat.deliver_program_int++;
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
588
					 pgm_info.code, 0);
589

590
	switch (pgm_info.code & ~PGM_PER) {
591 592 593 594 595 596 597 598 599
	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:
600 601
		nullifying = true;
		/* fall through */
602
	case PGM_SPACE_SWITCH:
603
		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
604 605 606 607 608 609 610 611
				  (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:
612
		rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
613
				  (u8 *)__LC_EXC_ACCESS_ID);
614
		nullifying = true;
615 616 617 618 619 620 621
		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:
622
		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
623
				  (u64 *)__LC_TRANS_EXC_CODE);
624
		rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
625
				   (u8 *)__LC_EXC_ACCESS_ID);
626
		rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
627
				   (u8 *)__LC_OP_ACCESS_ID);
628
		nullifying = true;
629 630
		break;
	case PGM_MONITOR:
631
		rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
632
				  (u16 *)__LC_MON_CLASS_NR);
633
		rc |= put_guest_lc(vcpu, pgm_info.mon_code,
634 635
				   (u64 *)__LC_MON_CODE);
		break;
E
Eric Farman 已提交
636
	case PGM_VECTOR_PROCESSING:
637
	case PGM_DATA:
638
		rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
639 640 641
				  (u32 *)__LC_DATA_EXC_CODE);
		break;
	case PGM_PROTECTION:
642
		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
643
				  (u64 *)__LC_TRANS_EXC_CODE);
644
		rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
645 646
				   (u8 *)__LC_EXC_ACCESS_ID);
		break;
647 648 649 650 651 652 653 654 655
	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;
656 657
	}

658 659
	if (pgm_info.code & PGM_PER) {
		rc |= put_guest_lc(vcpu, pgm_info.per_code,
660
				   (u8 *) __LC_PER_CODE);
661
		rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
662
				   (u8 *)__LC_PER_ATMID);
663
		rc |= put_guest_lc(vcpu, pgm_info.per_address,
664
				   (u64 *) __LC_PER_ADDRESS);
665
		rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
666 667 668
				   (u8 *) __LC_PER_ACCESS_ID);
	}

669
	if (nullifying && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND))
670
		kvm_s390_rewind_psw(vcpu, ilen);
671

672 673
	/* bit 1+2 of the target are the ilc, so we can directly use ilen */
	rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC);
674 675
	rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
				 (u64 *) __LC_LAST_BREAK);
676
	rc |= put_guest_lc(vcpu, pgm_info.code,
677 678 679 680 681
			   (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));
682
	return rc ? -EFAULT : 0;
683 684
}

685
static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
686
{
687 688 689 690 691 692 693 694 695 696 697 698 699
	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);
700

701
	VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
702
		   ext.ext_params);
703
	vcpu->stat.deliver_service_signal++;
704 705
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
					 ext.ext_params, 0);
706 707

	rc  = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
708
	rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
709 710 711 712
	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));
713
	rc |= put_guest_lc(vcpu, ext.ext_params,
714
			   (u32 *)__LC_EXT_PARAMS);
715

716
	return rc ? -EFAULT : 0;
717 718
}

719
static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
720
{
721 722 723
	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	struct kvm_s390_interrupt_info *inti;
	int rc = 0;
724

725 726 727 728 729 730 731 732 733 734 735
	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);
736

737
	if (inti) {
738 739 740 741 742 743
		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);

744 745 746 747 748 749 750 751 752 753 754 755 756 757
		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);
	}
758
	return rc ? -EFAULT : 0;
759 760
}

761
static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
762
{
763 764 765
	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	struct kvm_s390_interrupt_info *inti;
	int rc = 0;
766

767 768 769 770 771 772
	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,
773
			   "deliver: virtio parm: 0x%x,parm64: 0x%llx",
774 775 776 777 778 779 780 781 782 783 784 785
			   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);
786

787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803
	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);
	}
804
	return rc ? -EFAULT : 0;
805 806 807
}

static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
808
				     unsigned long irq_type)
809
{
810 811 812 813
	struct list_head *isc_list;
	struct kvm_s390_float_interrupt *fi;
	struct kvm_s390_interrupt_info *inti = NULL;
	int rc = 0;
814

815
	fi = &vcpu->kvm->arch.float_int;
816

817 818 819 820 821 822
	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) {
823
		VCPU_EVENT(vcpu, 4, "deliver: I/O 0x%llx", inti->type);
824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854
		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);
	}
855

856
	return rc ? -EFAULT : 0;
857 858 859 860 861 862
}

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

static const deliver_irq_t deliver_irq_funcs[] = {
	[IRQ_PEND_MCHK_EX]        = __deliver_machine_check,
863
	[IRQ_PEND_MCHK_REP]       = __deliver_machine_check,
864 865 866 867 868 869 870 871
	[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,
872 873 874
	[IRQ_PEND_EXT_SERVICE]    = __deliver_service,
	[IRQ_PEND_PFAULT_DONE]    = __deliver_pfault_done,
	[IRQ_PEND_VIRTIO]         = __deliver_virtio,
875 876
};

877 878
/* Check whether an external call is pending (deliverable or not) */
int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
879
{
880
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
881

882
	if (!sclp.has_sigpif)
883
		return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
884

885
	return sca_ext_call_pending(vcpu, NULL);
886 887
}

888
int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
889
{
890 891
	if (deliverable_irqs(vcpu))
		return 1;
892

893 894
	if (kvm_cpu_has_pending_timer(vcpu))
		return 1;
895

896
	/* external call pending and deliverable */
897
	if (kvm_s390_ext_call_pending(vcpu) &&
898 899
	    !psw_extint_disabled(vcpu) &&
	    (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
900
		return 1;
901

902 903 904
	if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
		return 1;
	return 0;
905 906
}

907 908
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
909
	return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
910 911
}

912 913 914 915 916 917
int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
{
	u64 now, sltime;

	vcpu->stat.exit_wait_state++;

918
	/* fast path */
919
	if (kvm_arch_vcpu_runnable(vcpu))
920
		return 0;
921

922 923
	if (psw_interrupts_disabled(vcpu)) {
		VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
924
		return -EOPNOTSUPP; /* disabled wait */
925 926
	}

927
	if (!ckc_interrupts_enabled(vcpu)) {
928
		VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
929
		__set_cpu_idle(vcpu);
930 931 932
		goto no_timer;
	}

933
	now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
934
	sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
935 936 937 938 939 940

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

	__set_cpu_idle(vcpu);
941
	hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
942
	VCPU_EVENT(vcpu, 4, "enabled wait via clock comparator: %llu ns", sltime);
943
no_timer:
944
	srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
945
	kvm_vcpu_block(vcpu);
946
	__unset_cpu_idle(vcpu);
947 948
	vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);

949
	hrtimer_cancel(&vcpu->arch.ckc_timer);
950 951 952
	return 0;
}

953 954 955 956 957 958 959 960 961
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);
962
		vcpu->stat.halt_wakeup++;
963 964 965
	}
}

966 967 968
enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
{
	struct kvm_vcpu *vcpu;
969
	u64 now, sltime;
970 971

	vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
972
	now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
973
	sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
974

975 976 977 978 979 980 981 982
	/*
	 * 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);
983 984
	return HRTIMER_NORESTART;
}
985

986 987 988 989
void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

990
	spin_lock(&li->lock);
991 992 993
	li->pending_irqs = 0;
	bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
	memset(&li->irq, 0, sizeof(li->irq));
994
	spin_unlock(&li->lock);
995

996
	sca_clear_ext_call(vcpu);
997 998
}

999
int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
1000
{
1001
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1002
	deliver_irq_t func;
1003
	int rc = 0;
1004
	unsigned long irq_type;
1005
	unsigned long irqs;
1006 1007 1008

	__reset_intercept_indicators(vcpu);

1009 1010
	/* pending ckc conditions might have been invalidated */
	clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1011
	if (ckc_irq_pending(vcpu))
1012 1013
		set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);

1014 1015 1016 1017 1018
	/* 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);

1019
	while ((irqs = deliverable_irqs(vcpu)) && !rc) {
1020
		/* bits are in the order of interrupt priority */
1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
		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);
1032
		}
1033
	}
1034

1035
	set_intercept_indicators(vcpu);
1036 1037

	return rc;
1038 1039
}

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

1044 1045 1046 1047
	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);

1048 1049 1050 1051 1052 1053 1054
	if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
		/* auto detection if no valid ILC was given */
		irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
		irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
		irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
	}

1055 1056
	if (irq->u.pgm.code == PGM_PER) {
		li->irq.pgm.code |= PGM_PER;
1057
		li->irq.pgm.flags = irq->u.pgm.flags;
1058 1059 1060 1061 1062 1063 1064 1065
		/* 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;
1066
		li->irq.pgm.flags = irq->u.pgm.flags;
1067 1068 1069 1070 1071 1072 1073 1074 1075 1076
		/* 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;
	}
1077
	set_bit(IRQ_PEND_PROG, &li->pending_irqs);
1078 1079 1080
	return 0;
}

1081
static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1082 1083 1084
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

1085 1086
	VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
		   irq->u.ext.ext_params2);
1087 1088
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
				   irq->u.ext.ext_params,
1089
				   irq->u.ext.ext_params2);
1090 1091 1092

	li->irq.ext = irq->u.ext;
	set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1093
	atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1094 1095 1096
	return 0;
}

1097
static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1098 1099
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1100
	struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1101
	uint16_t src_id = irq->u.extcall.code;
1102

1103
	VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1104
		   src_id);
1105
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1106
				   src_id, 0);
1107 1108

	/* sending vcpu invalid */
1109
	if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1110 1111
		return -EINVAL;

1112
	if (sclp.has_sigpif)
1113
		return sca_inject_ext_call(vcpu, src_id);
1114

1115
	if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1116
		return -EBUSY;
1117
	*extcall = irq->u.extcall;
1118
	atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1119 1120 1121
	return 0;
}

1122
static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1123 1124
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1125
	struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1126

1127
	VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1128
		   irq->u.prefix.address);
1129
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1130
				   irq->u.prefix.address, 0);
1131

1132 1133 1134
	if (!is_vcpu_stopped(vcpu))
		return -EBUSY;

1135 1136
	*prefix = irq->u.prefix;
	set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1137 1138 1139
	return 0;
}

1140
#define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1141
static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1142 1143
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1144
	struct kvm_s390_stop_info *stop = &li->irq.stop;
1145
	int rc = 0;
1146

1147
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1148

1149 1150 1151
	if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
		return -EINVAL;

1152 1153 1154 1155 1156 1157 1158 1159 1160
	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;
1161
	stop->flags = irq->u.stop.flags;
1162
	__set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1163 1164 1165 1166
	return 0;
}

static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1167
				 struct kvm_s390_irq *irq)
1168 1169 1170
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

1171
	VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1172
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1173 1174

	set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1175 1176 1177 1178
	return 0;
}

static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1179
				   struct kvm_s390_irq *irq)
1180 1181 1182
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

1183
	VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1184 1185
		   irq->u.emerg.code);
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1186
				   irq->u.emerg.code, 0);
1187

1188 1189 1190 1191
	/* sending vcpu invalid */
	if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
		return -EINVAL;

1192
	set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1193
	set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1194
	atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1195 1196 1197
	return 0;
}

1198
static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1199 1200
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1201
	struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1202

1203
	VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1204
		   irq->u.mchk.mcic);
1205
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1206
				   irq->u.mchk.mcic);
1207 1208

	/*
1209 1210 1211 1212 1213 1214
	 * 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
1215
	 */
1216
	mchk->cr14 |= irq->u.mchk.cr14;
1217
	mchk->mcic |= irq->u.mchk.mcic;
1218 1219 1220 1221
	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));
1222 1223 1224 1225
	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);
1226 1227 1228
	return 0;
}

1229
static int __inject_ckc(struct kvm_vcpu *vcpu)
1230 1231 1232
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

1233
	VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1234
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1235
				   0, 0);
1236 1237

	set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1238
	atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1239 1240 1241
	return 0;
}

1242
static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1243 1244 1245
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

1246
	VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1247
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1248
				   0, 0);
1249 1250

	set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1251
	atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1252 1253 1254
	return 0;
}

1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279
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;
}
1280

1281 1282 1283 1284
/*
 * 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).
 */
1285
struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1286 1287 1288 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
						    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)
1377 1378
{
	struct kvm_s390_float_interrupt *fi;
1379 1380
	struct list_head *list;
	int isc;
1381 1382 1383

	fi = &kvm->arch.float_int;
	spin_lock(&fi->lock);
1384 1385 1386
	if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
		spin_unlock(&fi->lock);
		return -EBUSY;
J
Jens Freimann 已提交
1387
	}
1388 1389 1390 1391 1392 1393
	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);
1394
	spin_unlock(&fi->lock);
1395
	return 0;
1396
}
1397

1398 1399 1400 1401
/*
 * Find a destination VCPU for a floating irq and kick it.
 */
static void __floating_irq_kick(struct kvm *kvm, u64 type)
1402
{
1403
	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1404
	struct kvm_s390_local_interrupt *li;
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
	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:
1430
		atomic_or(CPUSTAT_STOP_INT, li->cpuflags);
1431 1432
		break;
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1433
		atomic_or(CPUSTAT_IO_INT, li->cpuflags);
1434 1435
		break;
	default:
1436
		atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1437 1438 1439 1440 1441 1442 1443 1444
		break;
	}
	spin_unlock(&li->lock);
	kvm_s390_vcpu_wakeup(dst_vcpu);
}

static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
{
1445 1446
	u64 type = READ_ONCE(inti->type);
	int rc;
1447

1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464
	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
1465
		rc = -EINVAL;
1466
	}
1467 1468 1469
	if (rc)
		return rc;

1470
	__floating_irq_kick(kvm, type);
1471
	return 0;
1472 1473 1474 1475 1476 1477
}

int kvm_s390_inject_vm(struct kvm *kvm,
		       struct kvm_s390_interrupt *s390int)
{
	struct kvm_s390_interrupt_info *inti;
1478
	int rc;
1479

1480 1481 1482 1483
	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	if (!inti)
		return -ENOMEM;

1484 1485
	inti->type = s390int->type;
	switch (inti->type) {
1486
	case KVM_S390_INT_VIRTIO:
1487
		VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1488 1489 1490 1491 1492
			 s390int->parm, s390int->parm64);
		inti->ext.ext_params = s390int->parm;
		inti->ext.ext_params2 = s390int->parm64;
		break;
	case KVM_S390_INT_SERVICE:
1493
		VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1494 1495
		inti->ext.ext_params = s390int->parm;
		break;
1496 1497 1498
	case KVM_S390_INT_PFAULT_DONE:
		inti->ext.ext_params2 = s390int->parm64;
		break;
1499
	case KVM_S390_MCHK:
1500
		VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1501 1502 1503 1504
			 s390int->parm64);
		inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
		inti->mchk.mcic = s390int->parm64;
		break;
1505
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1506
		if (inti->type & KVM_S390_INT_IO_AI_MASK)
1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517
			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;
1518 1519 1520 1521
	default:
		kfree(inti);
		return -EINVAL;
	}
1522 1523
	trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
				 2);
1524

1525 1526 1527 1528
	rc = __inject_vm(kvm, inti);
	if (rc)
		kfree(inti);
	return rc;
1529 1530
}

1531
int kvm_s390_reinject_io_int(struct kvm *kvm,
1532 1533
			      struct kvm_s390_interrupt_info *inti)
{
1534
	return __inject_vm(kvm, inti);
1535 1536
}

1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549
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;
1550 1551 1552
	case KVM_S390_SIGP_STOP:
		irq->u.stop.flags = s390int->parm;
		break;
1553
	case KVM_S390_INT_EXTERNAL_CALL:
1554
		if (s390int->parm & 0xffff0000)
1555 1556 1557 1558
			return -EINVAL;
		irq->u.extcall.code = s390int->parm;
		break;
	case KVM_S390_INT_EMERGENCY:
1559
		if (s390int->parm & 0xffff0000)
1560 1561 1562 1563 1564 1565 1566 1567 1568 1569
			return -EINVAL;
		irq->u.emerg.code = s390int->parm;
		break;
	case KVM_S390_MCHK:
		irq->u.mchk.mcic = s390int->parm64;
		break;
	}
	return 0;
}

1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586
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);
}

1587
static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1588
{
1589
	int rc;
1590

1591
	switch (irq->type) {
1592
	case KVM_S390_PROGRAM_INT:
1593
		rc = __inject_prog(vcpu, irq);
1594
		break;
1595
	case KVM_S390_SIGP_SET_PREFIX:
1596
		rc = __inject_set_prefix(vcpu, irq);
1597
		break;
1598
	case KVM_S390_SIGP_STOP:
1599
		rc = __inject_sigp_stop(vcpu, irq);
1600
		break;
1601
	case KVM_S390_RESTART:
1602
		rc = __inject_sigp_restart(vcpu, irq);
1603
		break;
1604
	case KVM_S390_INT_CLOCK_COMP:
1605
		rc = __inject_ckc(vcpu);
1606
		break;
1607
	case KVM_S390_INT_CPU_TIMER:
1608
		rc = __inject_cpu_timer(vcpu);
1609
		break;
1610
	case KVM_S390_INT_EXTERNAL_CALL:
1611
		rc = __inject_extcall(vcpu, irq);
1612
		break;
1613
	case KVM_S390_INT_EMERGENCY:
1614
		rc = __inject_sigp_emergency(vcpu, irq);
1615
		break;
1616
	case KVM_S390_MCHK:
1617
		rc = __inject_mchk(vcpu, irq);
1618
		break;
1619
	case KVM_S390_INT_PFAULT_INIT:
1620
		rc = __inject_pfault_init(vcpu, irq);
1621
		break;
1622 1623
	case KVM_S390_INT_VIRTIO:
	case KVM_S390_INT_SERVICE:
1624
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1625
	default:
1626
		rc = -EINVAL;
1627
	}
1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638

	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);
1639
	spin_unlock(&li->lock);
1640 1641 1642
	if (!rc)
		kvm_s390_vcpu_wakeup(vcpu);
	return rc;
1643
}
1644

1645
static inline void clear_irq_list(struct list_head *_list)
1646
{
1647
	struct kvm_s390_interrupt_info *inti, *n;
1648

1649
	list_for_each_entry_safe(inti, n, _list, list) {
1650 1651 1652 1653 1654
		list_del(&inti->list);
		kfree(inti);
	}
}

1655 1656
static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
		       struct kvm_s390_irq *irq)
1657
{
1658
	irq->type = inti->type;
1659
	switch (inti->type) {
1660 1661
	case KVM_S390_INT_PFAULT_INIT:
	case KVM_S390_INT_PFAULT_DONE:
1662
	case KVM_S390_INT_VIRTIO:
1663
		irq->u.ext = inti->ext;
1664 1665
		break;
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1666
		irq->u.io = inti->io;
1667 1668 1669 1670
		break;
	}
}

1671 1672 1673 1674 1675 1676
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);
1677 1678 1679
	fi->pending_irqs = 0;
	memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
	memset(&fi->mchk, 0, sizeof(fi->mchk));
1680 1681 1682 1683 1684 1685 1686
	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);
};

1687
static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1688 1689 1690
{
	struct kvm_s390_interrupt_info *inti;
	struct kvm_s390_float_interrupt *fi;
1691
	struct kvm_s390_irq *buf;
1692
	struct kvm_s390_irq *irq;
1693
	int max_irqs;
1694 1695
	int ret = 0;
	int n = 0;
1696
	int i;
1697

1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711
	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);

1712 1713
	fi = &kvm->arch.float_int;
	spin_lock(&fi->lock);
1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725
	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)) {
1726
		if (n == max_irqs) {
1727 1728
			/* signal userspace to try again */
			ret = -ENOMEM;
1729
			goto out;
1730
		}
1731 1732 1733
		irq = (struct kvm_s390_irq *) &buf[n];
		irq->type = KVM_S390_INT_SERVICE;
		irq->u.ext = fi->srv_signal;
1734 1735
		n++;
	}
1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748
	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:
1749
	spin_unlock(&fi->lock);
1750 1751 1752 1753 1754
	if (!ret && n > 0) {
		if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
			ret = -EFAULT;
	}
	vfree(buf);
1755 1756 1757 1758 1759 1760 1761 1762 1763 1764

	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:
1765
		r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786
					  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) {
1787 1788
	case KVM_S390_INT_PFAULT_INIT:
	case KVM_S390_INT_PFAULT_DONE:
1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836
	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
1837 1838 1839 1840 1841
		r = __inject_vm(dev->kvm, inti);
		if (r) {
			kfree(inti);
			return r;
		}
1842 1843 1844 1845 1846 1847 1848
		len -= sizeof(struct kvm_s390_irq);
		attr->addr += sizeof(struct kvm_s390_irq);
	}

	return r;
}

1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914
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;
1915
	map->addr = gmap_translate(kvm->arch.gmap, addr);
1916 1917 1918 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
	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;
}

2014 2015 2016
static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
	int r = 0;
2017 2018
	unsigned int i;
	struct kvm_vcpu *vcpu;
2019 2020 2021 2022 2023 2024

	switch (attr->group) {
	case KVM_DEV_FLIC_ENQUEUE:
		r = enqueue_floating_irq(dev, attr);
		break;
	case KVM_DEV_FLIC_CLEAR_IRQS:
2025
		kvm_s390_clear_float_irqs(dev->kvm);
2026
		break;
2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040
	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;
2041 2042 2043 2044 2045 2046
	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;
2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077
	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,
};
2078 2079 2080 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

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;
}

2170
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)
{
2282
	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);
		}
	}

2322
	if (sca_ext_call_pending(vcpu, &scn)) {
2323 2324 2325 2326
		if (n + sizeof(irq) > len)
			return -ENOBUFS;
		memset(&irq, 0, sizeof(irq));
		irq.type = KVM_S390_INT_EXTERNAL_CALL;
2327
		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;
}