interrupt.c 45.3 KB
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/*
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 * handling kvm guest interrupts
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 *
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 * Copyright IBM Corp. 2008,2014
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 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (version 2 only)
 * as published by the Free Software Foundation.
 *
 *    Author(s): Carsten Otte <cotte@de.ibm.com>
 */

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#include <linux/interrupt.h>
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#include <linux/kvm_host.h>
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#include <linux/hrtimer.h>
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#include <linux/mmu_context.h>
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#include <linux/signal.h>
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#include <linux/slab.h>
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#include <asm/asm-offsets.h>
#include <asm/uaccess.h>
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#include "kvm-s390.h"
#include "gaccess.h"
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#include "trace-s390.h"
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#define IOINT_SCHID_MASK 0x0000ffff
#define IOINT_SSID_MASK 0x00030000
#define IOINT_CSSID_MASK 0x03fc0000
#define IOINT_AI_MASK 0x04000000
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#define PFAULT_INIT 0x0600
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#define PFAULT_DONE 0x0680
#define VIRTIO_PARAM 0x0d00
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static int is_ioint(u64 type)
{
	return ((type & 0xfffe0000u) != 0xfffe0000u);
}

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

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

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

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static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
{
	if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
	    (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
	    (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
		return 0;
	return 1;
}

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

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

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

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

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

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

static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
{
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	atomic_clear_mask(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
			  &vcpu->arch.sie_block->cpuflags);
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	vcpu->arch.sie_block->lctl = 0x0000;
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	vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);

	if (guestdbg_enabled(vcpu)) {
		vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
					       LCTL_CR10 | LCTL_CR11);
		vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
	}
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	if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP)
		atomic_set_mask(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags);
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}

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

static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
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				      struct kvm_s390_interrupt_info *inti)
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{
	switch (inti->type) {
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	case KVM_S390_INT_EXTERNAL_CALL:
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	case KVM_S390_INT_EMERGENCY:
	case KVM_S390_INT_SERVICE:
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	case KVM_S390_INT_PFAULT_INIT:
	case KVM_S390_INT_PFAULT_DONE:
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	case KVM_S390_INT_VIRTIO:
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	case KVM_S390_INT_CLOCK_COMP:
	case KVM_S390_INT_CPU_TIMER:
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		if (psw_extint_disabled(vcpu))
			__set_cpuflag(vcpu, CPUSTAT_EXT_INT);
		else
			vcpu->arch.sie_block->lctl |= LCTL_CR0;
		break;
	case KVM_S390_SIGP_STOP:
		__set_cpuflag(vcpu, CPUSTAT_STOP_INT);
		break;
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	case KVM_S390_MCHK:
		if (psw_mchk_disabled(vcpu))
			vcpu->arch.sie_block->ictl |= ICTL_LPSW;
		else
			vcpu->arch.sie_block->lctl |= LCTL_CR14;
		break;
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	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
		if (psw_ioint_disabled(vcpu))
			__set_cpuflag(vcpu, CPUSTAT_IO_INT);
		else
			vcpu->arch.sie_block->lctl |= LCTL_CR6;
		break;
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	default:
		BUG();
	}
}

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

	switch (vcpu->arch.sie_block->icptcode) {
	case ICPT_INST:
	case ICPT_INSTPROGI:
	case ICPT_OPEREXC:
	case ICPT_PARTEXEC:
	case ICPT_IOINST:
		/* last instruction only stored for these icptcodes */
		return table[vcpu->arch.sie_block->ipa >> 14];
	case ICPT_PROGI:
		return vcpu->arch.sie_block->pgmilc;
	default:
		return 0;
	}
}

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static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
{
	int rc;

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

	rc  = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
			   (u16 *)__LC_EXT_INT_CODE);
	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	return rc;
}

static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
{
	int rc;

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

	rc  = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
			   (u16 __user *)__LC_EXT_INT_CODE);
	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	return rc;
}

static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu,
					   struct kvm_s390_interrupt_info *inti)
{
	struct kvm_s390_ext_info *ext = &inti->ext;
	int rc;

	VCPU_EVENT(vcpu, 4, "interrupt: pfault init parm:%x,parm64:%llx",
		   0, ext->ext_params2);
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
					 KVM_S390_INT_PFAULT_INIT,
					 0, ext->ext_params2);

	rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
	rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	rc |= put_guest_lc(vcpu, ext->ext_params2, (u64 *) __LC_EXT_PARAMS2);
	return rc;
}

static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu,
					   struct kvm_s390_interrupt_info *inti)
{
	struct kvm_s390_mchk_info *mchk = &inti->mchk;
	int rc;

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

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

static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
{
	int rc;

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

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

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

	__set_cpuflag(vcpu, CPUSTAT_STOP_INT);
	return 0;
}

static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu,
					   struct kvm_s390_interrupt_info *inti)
{
	struct kvm_s390_prefix_info *prefix = &inti->prefix;

	VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x", prefix->address);
	vcpu->stat.deliver_prefix_signal++;
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
					 KVM_S390_SIGP_SET_PREFIX,
					 prefix->address, 0);

	kvm_s390_set_prefix(vcpu, prefix->address);
	return 0;
}

static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu,
					   struct kvm_s390_interrupt_info *inti)
{
	struct kvm_s390_emerg_info *emerg = &inti->emerg;
	int rc;

	VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
	vcpu->stat.deliver_emergency_signal++;
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
					 inti->emerg.code, 0);

	rc  = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
			   (u16 *)__LC_EXT_INT_CODE);
	rc |= put_guest_lc(vcpu, emerg->code, (u16 *)__LC_EXT_CPU_ADDR);
	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	return rc;
}

static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu,
					   struct kvm_s390_interrupt_info *inti)
{
	struct kvm_s390_extcall_info *extcall = &inti->extcall;
	int rc;

	VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
	vcpu->stat.deliver_external_call++;
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
					 KVM_S390_INT_EXTERNAL_CALL,
					 extcall->code, 0);

	rc  = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
			   (u16 *)__LC_EXT_INT_CODE);
	rc |= put_guest_lc(vcpu, extcall->code, (u16 *)__LC_EXT_CPU_ADDR);
	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
			    sizeof(psw_t));
	return rc;
}

static int __must_check __deliver_prog(struct kvm_vcpu *vcpu,
					   struct kvm_s390_interrupt_info *inti)
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{
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	struct kvm_s390_pgm_info *pgm_info = &inti->pgm;
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	int rc = 0;
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	u16 ilc = get_ilc(vcpu);
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	VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
		   pgm_info->code, ilc);
	vcpu->stat.deliver_program_int++;
	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
					 pgm_info->code, 0);

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	switch (pgm_info->code & ~PGM_PER) {
	case PGM_AFX_TRANSLATION:
	case PGM_ASX_TRANSLATION:
	case PGM_EX_TRANSLATION:
	case PGM_LFX_TRANSLATION:
	case PGM_LSTE_SEQUENCE:
	case PGM_LSX_TRANSLATION:
	case PGM_LX_TRANSLATION:
	case PGM_PRIMARY_AUTHORITY:
	case PGM_SECONDARY_AUTHORITY:
	case PGM_SPACE_SWITCH:
		rc = put_guest_lc(vcpu, pgm_info->trans_exc_code,
				  (u64 *)__LC_TRANS_EXC_CODE);
		break;
	case PGM_ALEN_TRANSLATION:
	case PGM_ALE_SEQUENCE:
	case PGM_ASTE_INSTANCE:
	case PGM_ASTE_SEQUENCE:
	case PGM_ASTE_VALIDITY:
	case PGM_EXTENDED_AUTHORITY:
		rc = put_guest_lc(vcpu, pgm_info->exc_access_id,
				  (u8 *)__LC_EXC_ACCESS_ID);
		break;
	case PGM_ASCE_TYPE:
	case PGM_PAGE_TRANSLATION:
	case PGM_REGION_FIRST_TRANS:
	case PGM_REGION_SECOND_TRANS:
	case PGM_REGION_THIRD_TRANS:
	case PGM_SEGMENT_TRANSLATION:
		rc = put_guest_lc(vcpu, pgm_info->trans_exc_code,
				  (u64 *)__LC_TRANS_EXC_CODE);
		rc |= put_guest_lc(vcpu, pgm_info->exc_access_id,
				   (u8 *)__LC_EXC_ACCESS_ID);
		rc |= put_guest_lc(vcpu, pgm_info->op_access_id,
				   (u8 *)__LC_OP_ACCESS_ID);
		break;
	case PGM_MONITOR:
		rc = put_guest_lc(vcpu, pgm_info->mon_class_nr,
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				  (u16 *)__LC_MON_CLASS_NR);
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		rc |= put_guest_lc(vcpu, pgm_info->mon_code,
				   (u64 *)__LC_MON_CODE);
		break;
	case PGM_DATA:
		rc = put_guest_lc(vcpu, pgm_info->data_exc_code,
				  (u32 *)__LC_DATA_EXC_CODE);
		break;
	case PGM_PROTECTION:
		rc = put_guest_lc(vcpu, pgm_info->trans_exc_code,
				  (u64 *)__LC_TRANS_EXC_CODE);
		rc |= put_guest_lc(vcpu, pgm_info->exc_access_id,
				   (u8 *)__LC_EXC_ACCESS_ID);
		break;
	}

	if (pgm_info->code & PGM_PER) {
		rc |= put_guest_lc(vcpu, pgm_info->per_code,
				   (u8 *) __LC_PER_CODE);
		rc |= put_guest_lc(vcpu, pgm_info->per_atmid,
				   (u8 *)__LC_PER_ATMID);
		rc |= put_guest_lc(vcpu, pgm_info->per_address,
				   (u64 *) __LC_PER_ADDRESS);
		rc |= put_guest_lc(vcpu, pgm_info->per_access_id,
				   (u8 *) __LC_PER_ACCESS_ID);
	}

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	rc |= put_guest_lc(vcpu, ilc, (u16 *) __LC_PGM_ILC);
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	rc |= put_guest_lc(vcpu, pgm_info->code,
			   (u16 *)__LC_PGM_INT_CODE);
	rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
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	return rc;
}

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

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

	rc  = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	rc |= put_guest_lc(vcpu, inti->ext.ext_params,
			   (u32 *)__LC_EXT_PARAMS);
	return rc;
}

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

	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
					 KVM_S390_INT_PFAULT_DONE, 0,
					 inti->ext.ext_params2);
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	rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *)__LC_EXT_INT_CODE);
	rc |= put_guest_lc(vcpu, PFAULT_DONE, (u16 *)__LC_EXT_CPU_ADDR);
	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
			   (u64 *)__LC_EXT_PARAMS2);
	return rc;
}

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

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

	rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *)__LC_EXT_INT_CODE);
	rc |= put_guest_lc(vcpu, VIRTIO_PARAM, (u16 *)__LC_EXT_CPU_ADDR);
	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	rc |= put_guest_lc(vcpu, inti->ext.ext_params,
			   (u32 *)__LC_EXT_PARAMS);
	rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
			   (u64 *)__LC_EXT_PARAMS2);
	return rc;
}

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

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

	rc  = put_guest_lc(vcpu, inti->io.subchannel_id,
			   (u16 *)__LC_SUBCHANNEL_ID);
	rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
			   (u16 *)__LC_SUBCHANNEL_NR);
	rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
			   (u32 *)__LC_IO_INT_PARM);
	rc |= put_guest_lc(vcpu, inti->io.io_int_word,
			   (u32 *)__LC_IO_INT_WORD);
	rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
572 573 574
	return rc;
}

575
static int __must_check __do_deliver_interrupt(struct kvm_vcpu *vcpu,
576
				   struct kvm_s390_interrupt_info *inti)
577
{
578
	int rc;
579 580 581

	switch (inti->type) {
	case KVM_S390_INT_EMERGENCY:
582
		rc = __deliver_emergency_signal(vcpu, inti);
583
		break;
584
	case KVM_S390_INT_EXTERNAL_CALL:
585
		rc = __deliver_external_call(vcpu, inti);
586
		break;
587
	case KVM_S390_INT_CLOCK_COMP:
588
		rc = __deliver_ckc(vcpu);
589 590
		break;
	case KVM_S390_INT_CPU_TIMER:
591
		rc = __deliver_cpu_timer(vcpu);
592
		break;
593
	case KVM_S390_INT_SERVICE:
594
		rc = __deliver_service(vcpu, inti);
595
		break;
596
	case KVM_S390_INT_PFAULT_INIT:
597
		rc = __deliver_pfault_init(vcpu, inti);
598 599
		break;
	case KVM_S390_INT_PFAULT_DONE:
600
		rc = __deliver_pfault_done(vcpu, inti);
601
		break;
602
	case KVM_S390_INT_VIRTIO:
603
		rc = __deliver_virtio(vcpu, inti);
604 605
		break;
	case KVM_S390_SIGP_STOP:
606
		rc = __deliver_stop(vcpu);
607 608
		break;
	case KVM_S390_SIGP_SET_PREFIX:
609
		rc = __deliver_set_prefix(vcpu, inti);
610 611
		break;
	case KVM_S390_RESTART:
612
		rc = __deliver_restart(vcpu);
613 614
		break;
	case KVM_S390_PROGRAM_INT:
615
		rc = __deliver_prog(vcpu, inti);
616
		break;
617
	case KVM_S390_MCHK:
618
		rc = __deliver_machine_check(vcpu, inti);
619
		break;
620
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
621
		rc = __deliver_io(vcpu, inti);
622
		break;
623 624 625
	default:
		BUG();
	}
626 627

	return rc;
628 629
}

630 631 632 633 634 635 636 637 638 639 640 641 642 643
/* Check whether SIGP interpretation facility has an external call pending */
int kvm_s390_si_ext_call_pending(struct kvm_vcpu *vcpu)
{
	atomic_t *sigp_ctrl = &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].ctrl;

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

	return 0;
}

644
int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
645
{
646 647 648
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
	struct kvm_s390_interrupt_info  *inti;
649 650 651
	int rc = 0;

	if (atomic_read(&li->active)) {
652
		spin_lock(&li->lock);
653 654 655 656 657
		list_for_each_entry(inti, &li->list, list)
			if (__interrupt_is_deliverable(vcpu, inti)) {
				rc = 1;
				break;
			}
658
		spin_unlock(&li->lock);
659 660 661
	}

	if ((!rc) && atomic_read(&fi->active)) {
662
		spin_lock(&fi->lock);
663 664 665 666 667
		list_for_each_entry(inti, &fi->list, list)
			if (__interrupt_is_deliverable(vcpu, inti)) {
				rc = 1;
				break;
			}
668
		spin_unlock(&fi->lock);
669 670
	}

671 672
	if (!rc && kvm_cpu_has_pending_timer(vcpu))
		rc = 1;
673

674 675 676
	if (!rc && kvm_s390_si_ext_call_pending(vcpu))
		rc = 1;

677 678 679
	return rc;
}

680 681
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
682 683 684 685 686 687
	if (!(vcpu->arch.sie_block->ckc <
	      get_tod_clock_fast() + vcpu->arch.sie_block->epoch))
		return 0;
	if (!ckc_interrupts_enabled(vcpu))
		return 0;
	return 1;
688 689
}

690 691 692 693 694 695
int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
{
	u64 now, sltime;

	vcpu->stat.exit_wait_state++;

696 697 698
	/* fast path */
	if (kvm_cpu_has_pending_timer(vcpu) || kvm_arch_vcpu_runnable(vcpu))
		return 0;
699

700 701
	if (psw_interrupts_disabled(vcpu)) {
		VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
702
		return -EOPNOTSUPP; /* disabled wait */
703 704
	}

705
	__set_cpu_idle(vcpu);
706
	if (!ckc_interrupts_enabled(vcpu)) {
707 708 709 710
		VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
		goto no_timer;
	}

711
	now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
712
	sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
713 714
	hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
	VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
715
no_timer:
716
	srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
717
	kvm_vcpu_block(vcpu);
718
	__unset_cpu_idle(vcpu);
719 720
	vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);

721
	hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
722 723 724
	return 0;
}

725 726 727 728 729 730 731 732 733
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);
734
		vcpu->stat.halt_wakeup++;
735 736 737
	}
}

738 739 740 741 742
enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
{
	struct kvm_vcpu *vcpu;

	vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
743
	kvm_s390_vcpu_wakeup(vcpu);
744 745 746

	return HRTIMER_NORESTART;
}
747

748 749 750 751 752
void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	struct kvm_s390_interrupt_info  *n, *inti = NULL;

753
	spin_lock(&li->lock);
754 755 756 757 758
	list_for_each_entry_safe(inti, n, &li->list, list) {
		list_del(&inti->list);
		kfree(inti);
	}
	atomic_set(&li->active, 0);
759
	spin_unlock(&li->lock);
760 761 762 763 764

	/* clear pending external calls set by sigp interpretation facility */
	atomic_clear_mask(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
	atomic_clear_mask(SIGP_CTRL_C,
			  &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].ctrl);
765 766
}

767
int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
768
{
769 770 771
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
	struct kvm_s390_interrupt_info  *n, *inti = NULL;
772
	int deliver;
773
	int rc = 0;
774 775 776 777 778

	__reset_intercept_indicators(vcpu);
	if (atomic_read(&li->active)) {
		do {
			deliver = 0;
779
			spin_lock(&li->lock);
780 781 782 783 784 785 786 787 788 789
			list_for_each_entry_safe(inti, n, &li->list, list) {
				if (__interrupt_is_deliverable(vcpu, inti)) {
					list_del(&inti->list);
					deliver = 1;
					break;
				}
				__set_intercept_indicator(vcpu, inti);
			}
			if (list_empty(&li->list))
				atomic_set(&li->active, 0);
790
			spin_unlock(&li->lock);
791
			if (deliver) {
792
				rc = __do_deliver_interrupt(vcpu, inti);
793 794
				kfree(inti);
			}
795
		} while (!rc && deliver);
796 797
	}

798
	if (!rc && kvm_cpu_has_pending_timer(vcpu))
799
		rc = __deliver_ckc(vcpu);
800

801
	if (!rc && atomic_read(&fi->active)) {
802 803
		do {
			deliver = 0;
804
			spin_lock(&fi->lock);
805 806 807
			list_for_each_entry_safe(inti, n, &fi->list, list) {
				if (__interrupt_is_deliverable(vcpu, inti)) {
					list_del(&inti->list);
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Jens Freimann 已提交
808
					fi->irq_count--;
809 810 811 812 813 814 815
					deliver = 1;
					break;
				}
				__set_intercept_indicator(vcpu, inti);
			}
			if (list_empty(&fi->list))
				atomic_set(&fi->active, 0);
816
			spin_unlock(&fi->lock);
817
			if (deliver) {
818
				rc = __do_deliver_interrupt(vcpu, inti);
819 820
				kfree(inti);
			}
821
		} while (!rc && deliver);
822
	}
823 824

	return rc;
825 826
}

827 828 829 830 831 832 833 834 835 836
static int __inject_prog_irq(struct kvm_vcpu *vcpu,
			     struct kvm_s390_interrupt_info *inti)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

	list_add(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	return 0;
}

837 838
int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
{
839 840
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	struct kvm_s390_interrupt_info *inti;
841 842 843 844 845

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

846
	inti->type = KVM_S390_PROGRAM_INT;
847 848 849
	inti->pgm.code = code;

	VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
850
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, inti->type, code, 0, 1);
851
	spin_lock(&li->lock);
852 853
	list_add(&inti->list, &li->list);
	atomic_set(&li->active, 1);
854
	BUG_ON(waitqueue_active(li->wq));
855
	spin_unlock(&li->lock);
856 857 858 859 860 861 862 863
	return 0;
}

int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
			     struct kvm_s390_pgm_info *pgm_info)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	struct kvm_s390_interrupt_info *inti;
864
	int rc;
865 866 867 868 869 870 871 872 873 874 875 876

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

	VCPU_EVENT(vcpu, 3, "inject: prog irq %d (from kernel)",
		   pgm_info->code);
	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
				   pgm_info->code, 0, 1);

	inti->type = KVM_S390_PROGRAM_INT;
	memcpy(&inti->pgm, pgm_info, sizeof(inti->pgm));
877
	spin_lock(&li->lock);
878
	rc = __inject_prog_irq(vcpu, inti);
879
	BUG_ON(waitqueue_active(li->wq));
880
	spin_unlock(&li->lock);
881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004
	return rc;
}

static int __inject_pfault_init(struct kvm_vcpu *vcpu,
				struct kvm_s390_interrupt *s390int,
				struct kvm_s390_interrupt_info *inti)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

	inti->ext.ext_params2 = s390int->parm64;
	list_add_tail(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	return 0;
}

static int __inject_extcall(struct kvm_vcpu *vcpu,
			    struct kvm_s390_interrupt *s390int,
			    struct kvm_s390_interrupt_info *inti)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

	VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
		   s390int->parm);
	if (s390int->parm & 0xffff0000)
		return -EINVAL;
	inti->extcall.code = s390int->parm;
	list_add_tail(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	return 0;
}

static int __inject_set_prefix(struct kvm_vcpu *vcpu,
			       struct kvm_s390_interrupt *s390int,
			       struct kvm_s390_interrupt_info *inti)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

	VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
		   s390int->parm);
	inti->prefix.address = s390int->parm;
	list_add_tail(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	return 0;
}

static int __inject_sigp_stop(struct kvm_vcpu *vcpu,
			      struct kvm_s390_interrupt *s390int,
			      struct kvm_s390_interrupt_info *inti)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

	list_add_tail(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	li->action_bits |= ACTION_STOP_ON_STOP;
	return 0;
}

static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
				 struct kvm_s390_interrupt *s390int,
				 struct kvm_s390_interrupt_info *inti)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

	VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
	list_add_tail(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	return 0;
}

static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
				   struct kvm_s390_interrupt *s390int,
				   struct kvm_s390_interrupt_info *inti)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

	VCPU_EVENT(vcpu, 3, "inject: emergency %u\n", s390int->parm);
	if (s390int->parm & 0xffff0000)
		return -EINVAL;
	inti->emerg.code = s390int->parm;
	list_add_tail(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	return 0;
}

static int __inject_mchk(struct kvm_vcpu *vcpu,
			 struct kvm_s390_interrupt *s390int,
			 struct kvm_s390_interrupt_info *inti)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

	VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx",
		   s390int->parm64);
	inti->mchk.mcic = s390int->parm64;
	list_add_tail(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	return 0;
}

static int __inject_ckc(struct kvm_vcpu *vcpu,
			struct kvm_s390_interrupt *s390int,
			struct kvm_s390_interrupt_info *inti)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

	VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
	list_add_tail(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	return 0;
}

static int __inject_cpu_timer(struct kvm_vcpu *vcpu,
			      struct kvm_s390_interrupt *s390int,
			      struct kvm_s390_interrupt_info *inti)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;

	VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
	list_add_tail(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1005 1006 1007
	return 0;
}

1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022
struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
						    u64 cr6, u64 schid)
{
	struct kvm_s390_float_interrupt *fi;
	struct kvm_s390_interrupt_info *inti, *iter;

	if ((!schid && !cr6) || (schid && cr6))
		return NULL;
	mutex_lock(&kvm->lock);
	fi = &kvm->arch.float_int;
	spin_lock(&fi->lock);
	inti = NULL;
	list_for_each_entry(iter, &fi->list, list) {
		if (!is_ioint(iter->type))
			continue;
C
Cornelia Huck 已提交
1023 1024
		if (cr6 &&
		    ((cr6 & int_word_to_isc_bits(iter->io.io_int_word)) == 0))
1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036
			continue;
		if (schid) {
			if (((schid & 0x00000000ffff0000) >> 16) !=
			    iter->io.subchannel_id)
				continue;
			if ((schid & 0x000000000000ffff) !=
			    iter->io.subchannel_nr)
				continue;
		}
		inti = iter;
		break;
	}
J
Jens Freimann 已提交
1037
	if (inti) {
1038
		list_del_init(&inti->list);
J
Jens Freimann 已提交
1039 1040
		fi->irq_count--;
	}
1041 1042 1043 1044 1045 1046
	if (list_empty(&fi->list))
		atomic_set(&fi->active, 0);
	spin_unlock(&fi->lock);
	mutex_unlock(&kvm->lock);
	return inti;
}
1047

J
Jens Freimann 已提交
1048
static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1049
{
1050 1051
	struct kvm_s390_local_interrupt *li;
	struct kvm_s390_float_interrupt *fi;
1052
	struct kvm_s390_interrupt_info *iter;
1053
	struct kvm_vcpu *dst_vcpu = NULL;
1054
	int sigcpu;
J
Jens Freimann 已提交
1055
	int rc = 0;
1056

1057 1058 1059
	mutex_lock(&kvm->lock);
	fi = &kvm->arch.float_int;
	spin_lock(&fi->lock);
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Jens Freimann 已提交
1060 1061 1062 1063 1064
	if (fi->irq_count >= KVM_S390_MAX_FLOAT_IRQS) {
		rc = -EINVAL;
		goto unlock_fi;
	}
	fi->irq_count++;
1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087
	if (!is_ioint(inti->type)) {
		list_add_tail(&inti->list, &fi->list);
	} else {
		u64 isc_bits = int_word_to_isc_bits(inti->io.io_int_word);

		/* Keep I/O interrupts sorted in isc order. */
		list_for_each_entry(iter, &fi->list, list) {
			if (!is_ioint(iter->type))
				continue;
			if (int_word_to_isc_bits(iter->io.io_int_word)
			    <= isc_bits)
				continue;
			break;
		}
		list_add_tail(&inti->list, &iter->list);
	}
	atomic_set(&fi->active, 1);
	sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
	if (sigcpu == KVM_MAX_VCPUS) {
		do {
			sigcpu = fi->next_rr_cpu++;
			if (sigcpu == KVM_MAX_VCPUS)
				sigcpu = fi->next_rr_cpu = 0;
1088
		} while (kvm_get_vcpu(kvm, sigcpu) == NULL);
1089
	}
1090 1091
	dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
	li = &dst_vcpu->arch.local_int;
1092
	spin_lock(&li->lock);
1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103
	switch (inti->type) {
	case KVM_S390_MCHK:
		atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
		break;
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
		atomic_set_mask(CPUSTAT_IO_INT, li->cpuflags);
		break;
	default:
		atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
		break;
	}
1104
	spin_unlock(&li->lock);
1105
	kvm_s390_vcpu_wakeup(kvm_get_vcpu(kvm, sigcpu));
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Jens Freimann 已提交
1106
unlock_fi:
1107 1108
	spin_unlock(&fi->lock);
	mutex_unlock(&kvm->lock);
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1109
	return rc;
1110 1111 1112 1113 1114 1115 1116
}

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

1117 1118 1119 1120
	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	if (!inti)
		return -ENOMEM;

1121 1122
	inti->type = s390int->type;
	switch (inti->type) {
1123
	case KVM_S390_INT_VIRTIO:
1124
		VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1125 1126 1127 1128 1129 1130 1131 1132
			 s390int->parm, s390int->parm64);
		inti->ext.ext_params = s390int->parm;
		inti->ext.ext_params2 = s390int->parm64;
		break;
	case KVM_S390_INT_SERVICE:
		VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
		inti->ext.ext_params = s390int->parm;
		break;
1133 1134 1135 1136
	case KVM_S390_INT_PFAULT_DONE:
		inti->type = s390int->type;
		inti->ext.ext_params2 = s390int->parm64;
		break;
1137 1138 1139 1140 1141 1142
	case KVM_S390_MCHK:
		VM_EVENT(kvm, 5, "inject: machine check parm64:%llx",
			 s390int->parm64);
		inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
		inti->mchk.mcic = s390int->parm64;
		break;
1143
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1144
		if (inti->type & IOINT_AI_MASK)
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155
			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;
1156 1157 1158 1159
	default:
		kfree(inti);
		return -EINVAL;
	}
1160 1161
	trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
				 2);
1162

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1163
	return __inject_vm(kvm, inti);
1164 1165
}

1166 1167 1168 1169 1170 1171
void kvm_s390_reinject_io_int(struct kvm *kvm,
			      struct kvm_s390_interrupt_info *inti)
{
	__inject_vm(kvm, inti);
}

1172 1173 1174
int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
			 struct kvm_s390_interrupt *s390int)
{
1175
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1176
	struct kvm_s390_interrupt_info *inti;
1177
	int rc;
1178 1179 1180 1181 1182

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

1183 1184 1185 1186 1187 1188
	inti->type = s390int->type;

	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type,
				   s390int->parm, 0, 2);
	spin_lock(&li->lock);
	switch (inti->type) {
1189 1190 1191
	case KVM_S390_PROGRAM_INT:
		VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
			   s390int->parm);
1192 1193 1194 1195 1196
		inti->pgm.code = s390int->parm;
		if (s390int->parm & 0xffff0000)
			rc = -EINVAL;
		else
			rc = __inject_prog_irq(vcpu, inti);
1197
		break;
1198
	case KVM_S390_SIGP_SET_PREFIX:
1199
		rc = __inject_set_prefix(vcpu, s390int, inti);
1200
		break;
1201
	case KVM_S390_SIGP_STOP:
1202 1203
		rc = __inject_sigp_stop(vcpu, s390int, inti);
		break;
1204
	case KVM_S390_RESTART:
1205 1206
		rc = __inject_sigp_restart(vcpu, s390int, inti);
		break;
1207
	case KVM_S390_INT_CLOCK_COMP:
1208 1209
		rc = __inject_ckc(vcpu, s390int, inti);
		break;
1210
	case KVM_S390_INT_CPU_TIMER:
1211
		rc = __inject_cpu_timer(vcpu, s390int, inti);
1212
		break;
1213
	case KVM_S390_INT_EXTERNAL_CALL:
1214
		rc = __inject_extcall(vcpu, s390int, inti);
1215
		break;
1216
	case KVM_S390_INT_EMERGENCY:
1217
		rc = __inject_sigp_emergency(vcpu, s390int, inti);
1218
		break;
1219
	case KVM_S390_MCHK:
1220
		rc = __inject_mchk(vcpu, s390int, inti);
1221
		break;
1222
	case KVM_S390_INT_PFAULT_INIT:
1223
		rc = __inject_pfault_init(vcpu, s390int, inti);
1224
		break;
1225 1226
	case KVM_S390_INT_VIRTIO:
	case KVM_S390_INT_SERVICE:
1227
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1228
	default:
1229
		rc = -EINVAL;
1230
	}
1231
	spin_unlock(&li->lock);
1232 1233 1234 1235 1236
	if (!rc)
		kvm_s390_vcpu_wakeup(vcpu);
	else
		kfree(inti);
	return rc;
1237
}
1238

1239
void kvm_s390_clear_float_irqs(struct kvm *kvm)
1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250
{
	struct kvm_s390_float_interrupt *fi;
	struct kvm_s390_interrupt_info	*n, *inti = NULL;

	mutex_lock(&kvm->lock);
	fi = &kvm->arch.float_int;
	spin_lock(&fi->lock);
	list_for_each_entry_safe(inti, n, &fi->list, list) {
		list_del(&inti->list);
		kfree(inti);
	}
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Jens Freimann 已提交
1251
	fi->irq_count = 0;
1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264
	atomic_set(&fi->active, 0);
	spin_unlock(&fi->lock);
	mutex_unlock(&kvm->lock);
}

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

	irq.type = inti->type;
	switch (inti->type) {
1265 1266
	case KVM_S390_INT_PFAULT_INIT:
	case KVM_S390_INT_PFAULT_DONE:
1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 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
	case KVM_S390_INT_VIRTIO:
	case KVM_S390_INT_SERVICE:
		irq.u.ext = inti->ext;
		break;
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
		irq.u.io = inti->io;
		break;
	case KVM_S390_MCHK:
		irq.u.mchk = inti->mchk;
		break;
	default:
		return -EINVAL;
	}

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

	return 0;
}

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

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

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

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

	return ret < 0 ? ret : n;
}

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

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

	return r;
}

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

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

	switch (inti->type) {
1346 1347
	case KVM_S390_INT_PFAULT_INIT:
	case KVM_S390_INT_PFAULT_DONE:
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 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395
	case KVM_S390_INT_VIRTIO:
	case KVM_S390_INT_SERVICE:
		target = (void *) &inti->ext;
		source = &uptr->u.ext;
		size = sizeof(inti->ext);
		break;
	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
		target = (void *) &inti->io;
		source = &uptr->u.io;
		size = sizeof(inti->io);
		break;
	case KVM_S390_MCHK:
		target = (void *) &inti->mchk;
		source = &uptr->u.mchk;
		size = sizeof(inti->mchk);
		break;
	default:
		return -EINVAL;
	}

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

	return 0;
}

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

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

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

		r = copy_irq_from_user(inti, attr->addr);
		if (r) {
			kfree(inti);
			return r;
		}
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Jens Freimann 已提交
1396 1397 1398 1399 1400
		r = __inject_vm(dev->kvm, inti);
		if (r) {
			kfree(inti);
			return r;
		}
1401 1402 1403 1404 1405 1406 1407
		len -= sizeof(struct kvm_s390_irq);
		attr->addr += sizeof(struct kvm_s390_irq);
	}

	return r;
}

1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473
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;
1474
	map->addr = gmap_translate(kvm->arch.gmap, addr);
1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572
	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;
}

1573 1574 1575
static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
	int r = 0;
1576 1577
	unsigned int i;
	struct kvm_vcpu *vcpu;
1578 1579 1580 1581 1582 1583

	switch (attr->group) {
	case KVM_DEV_FLIC_ENQUEUE:
		r = enqueue_floating_irq(dev, attr);
		break;
	case KVM_DEV_FLIC_CLEAR_IRQS:
1584
		kvm_s390_clear_float_irqs(dev->kvm);
1585
		break;
1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599
	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;
1600 1601 1602 1603 1604 1605
	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;
1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636
	default:
		r = -EINVAL;
	}

	return r;
}

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

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

/* s390 floating irq controller (flic) */
struct kvm_device_ops kvm_flic_ops = {
	.name = "kvm-flic",
	.get_attr = flic_get_attr,
	.set_attr = flic_set_attr,
	.create = flic_create,
	.destroy = flic_destroy,
};
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static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
{
	unsigned long bit;

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

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

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

	if (!adapter)
		return NULL;

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

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

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

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

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

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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;
}