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linux/arch/s390/kvm/interrupt.c
David Hildenbrand 3192c63950 KVM: s390: a VCPU is already started when delivering interrupts 
This patch removes the start of a VCPU when delivering a RESTART interrupt.
Interrupt delivery is called from kvm_arch_vcpu_ioctl_run. So the VCPU is
already considered started - no need to call kvm_s390_vcpu_start. This function
will early exit anyway.

Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-05-30 09:39:39 +02:00

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/*
* handling kvm guest interrupts
*
* Copyright IBM Corp. 2008,2014
*
* 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>
*/
#include <linux/interrupt.h>
#include <linux/kvm_host.h>
#include <linux/hrtimer.h>
#include <linux/mmu_context.h>
#include <linux/signal.h>
#include <linux/slab.h>
#include <asm/asm-offsets.h>
#include <asm/uaccess.h>
#include "kvm-s390.h"
#include "gaccess.h"
#include "trace-s390.h"
#define IOINT_SCHID_MASK 0x0000ffff
#define IOINT_SSID_MASK 0x00030000
#define IOINT_CSSID_MASK 0x03fc0000
#define IOINT_AI_MASK 0x04000000
static void deliver_ckc_interrupt(struct kvm_vcpu *vcpu);
static int is_ioint(u64 type)
{
return ((type & 0xfffe0000u) != 0xfffe0000u);
}
int psw_extint_disabled(struct kvm_vcpu *vcpu)
{
return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
}
static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
{
return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
}
static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
{
return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
}
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;
}
static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
{
if (psw_extint_disabled(vcpu) ||
!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
return 0;
if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
/* No timer interrupts when single stepping */
return 0;
return 1;
}
static u64 int_word_to_isc_bits(u32 int_word)
{
u8 isc = (int_word & 0x38000000) >> 27;
return (0x80 >> isc) << 24;
}
static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
struct kvm_s390_interrupt_info *inti)
{
switch (inti->type) {
case KVM_S390_INT_EXTERNAL_CALL:
if (psw_extint_disabled(vcpu))
return 0;
if (vcpu->arch.sie_block->gcr[0] & 0x2000ul)
return 1;
case KVM_S390_INT_EMERGENCY:
if (psw_extint_disabled(vcpu))
return 0;
if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
return 1;
return 0;
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;
case KVM_S390_INT_SERVICE:
case KVM_S390_INT_PFAULT_INIT:
case KVM_S390_INT_PFAULT_DONE:
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;
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;
case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
if (psw_ioint_disabled(vcpu))
return 0;
if (vcpu->arch.sie_block->gcr[6] &
int_word_to_isc_bits(inti->io.io_int_word))
return 1;
return 0;
default:
printk(KERN_WARNING "illegal interrupt type %llx\n",
inti->type);
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)
{
atomic_clear_mask(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
&vcpu->arch.sie_block->cpuflags);
vcpu->arch.sie_block->lctl = 0x0000;
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);
}
}
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,
struct kvm_s390_interrupt_info *inti)
{
switch (inti->type) {
case KVM_S390_INT_EXTERNAL_CALL:
case KVM_S390_INT_EMERGENCY:
case KVM_S390_INT_SERVICE:
case KVM_S390_INT_PFAULT_INIT:
case KVM_S390_INT_PFAULT_DONE:
case KVM_S390_INT_VIRTIO:
case KVM_S390_INT_CLOCK_COMP:
case KVM_S390_INT_CPU_TIMER:
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;
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;
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;
default:
BUG();
}
}
static int __deliver_prog_irq(struct kvm_vcpu *vcpu,
struct kvm_s390_pgm_info *pgm_info)
{
const unsigned short table[] = { 2, 4, 4, 6 };
int rc = 0;
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,
(u64 *)__LC_MON_CLASS_NR);
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);
}
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 */
rc |= put_guest_lc(vcpu, table[vcpu->arch.sie_block->ipa >> 14],
(u16 *) __LC_PGM_ILC);
break;
case ICPT_PROGI:
rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->pgmilc,
(u16 *) __LC_PGM_ILC);
break;
default:
rc |= put_guest_lc(vcpu, 0,
(u16 *) __LC_PGM_ILC);
}
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));
return rc;
}
static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
struct kvm_s390_interrupt_info *inti)
{
const unsigned short table[] = { 2, 4, 4, 6 };
int rc = 0;
switch (inti->type) {
case KVM_S390_INT_EMERGENCY:
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, 0x1201, (u16 *)__LC_EXT_INT_CODE);
rc |= put_guest_lc(vcpu, inti->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));
break;
case KVM_S390_INT_EXTERNAL_CALL:
VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
vcpu->stat.deliver_external_call++;
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
inti->extcall.code, 0);
rc = put_guest_lc(vcpu, 0x1202, (u16 *)__LC_EXT_INT_CODE);
rc |= put_guest_lc(vcpu, inti->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));
break;
case KVM_S390_INT_CLOCK_COMP:
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
inti->ext.ext_params, 0);
deliver_ckc_interrupt(vcpu);
break;
case KVM_S390_INT_CPU_TIMER:
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
inti->ext.ext_params, 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));
rc |= put_guest_lc(vcpu, inti->ext.ext_params,
(u32 *)__LC_EXT_PARAMS);
break;
case KVM_S390_INT_SERVICE:
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, 0x2401, (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);
break;
case KVM_S390_INT_PFAULT_INIT:
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 0,
inti->ext.ext_params2);
rc = put_guest_lc(vcpu, 0x2603, (u16 *) __LC_EXT_INT_CODE);
rc |= put_guest_lc(vcpu, 0x0600, (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);
break;
case KVM_S390_INT_PFAULT_DONE:
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 0,
inti->ext.ext_params2);
rc = put_guest_lc(vcpu, 0x2603, (u16 *)__LC_EXT_INT_CODE);
rc |= put_guest_lc(vcpu, 0x0680, (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);
break;
case KVM_S390_INT_VIRTIO:
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, 0x2603, (u16 *)__LC_EXT_INT_CODE);
rc |= put_guest_lc(vcpu, 0x0d00, (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);
break;
case KVM_S390_SIGP_STOP:
VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
vcpu->stat.deliver_stop_signal++;
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
0, 0);
__set_intercept_indicator(vcpu, inti);
break;
case KVM_S390_SIGP_SET_PREFIX:
VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x",
inti->prefix.address);
vcpu->stat.deliver_prefix_signal++;
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
inti->prefix.address, 0);
kvm_s390_set_prefix(vcpu, inti->prefix.address);
break;
case KVM_S390_RESTART:
VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
vcpu->stat.deliver_restart_signal++;
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
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));
break;
case KVM_S390_PROGRAM_INT:
VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
inti->pgm.code,
table[vcpu->arch.sie_block->ipa >> 14]);
vcpu->stat.deliver_program_int++;
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
inti->pgm.code, 0);
rc = __deliver_prog_irq(vcpu, &inti->pgm);
break;
case KVM_S390_MCHK:
VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx",
inti->mchk.mcic);
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
inti->mchk.cr14,
inti->mchk.mcic);
rc = kvm_s390_vcpu_store_status(vcpu,
KVM_S390_STORE_STATUS_PREFIXED);
rc |= put_guest_lc(vcpu, inti->mchk.mcic, (u64 *)__LC_MCCK_CODE);
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));
break;
case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
{
__u32 param0 = ((__u32)inti->io.subchannel_id << 16) |
inti->io.subchannel_nr;
__u64 param1 = ((__u64)inti->io.io_int_parm << 32) |
inti->io.io_int_word;
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,
param0, param1);
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));
break;
}
default:
BUG();
}
if (rc) {
printk("kvm: The guest lowcore is not mapped during interrupt "
"delivery, killing userspace\n");
do_exit(SIGKILL);
}
}
static void deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
{
int rc;
rc = put_guest_lc(vcpu, 0x1004, (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));
if (rc) {
printk("kvm: The guest lowcore is not mapped during interrupt "
"delivery, killing userspace\n");
do_exit(SIGKILL);
}
}
/* 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;
}
int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
{
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;
int rc = 0;
if (atomic_read(&li->active)) {
spin_lock_bh(&li->lock);
list_for_each_entry(inti, &li->list, list)
if (__interrupt_is_deliverable(vcpu, inti)) {
rc = 1;
break;
}
spin_unlock_bh(&li->lock);
}
if ((!rc) && atomic_read(&fi->active)) {
spin_lock(&fi->lock);
list_for_each_entry(inti, &fi->list, list)
if (__interrupt_is_deliverable(vcpu, inti)) {
rc = 1;
break;
}
spin_unlock(&fi->lock);
}
if (!rc && kvm_cpu_has_pending_timer(vcpu))
rc = 1;
if (!rc && kvm_s390_si_ext_call_pending(vcpu))
rc = 1;
return rc;
}
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
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;
}
int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
{
u64 now, sltime;
DECLARE_WAITQUEUE(wait, current);
vcpu->stat.exit_wait_state++;
if (kvm_cpu_has_interrupt(vcpu))
return 0;
__set_cpu_idle(vcpu);
spin_lock_bh(&vcpu->arch.local_int.lock);
vcpu->arch.local_int.timer_due = 0;
spin_unlock_bh(&vcpu->arch.local_int.lock);
if (psw_interrupts_disabled(vcpu)) {
VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
__unset_cpu_idle(vcpu);
return -EOPNOTSUPP; /* disabled wait */
}
if (!ckc_interrupts_enabled(vcpu)) {
VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
goto no_timer;
}
now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
if (vcpu->arch.sie_block->ckc < now) {
__unset_cpu_idle(vcpu);
return 0;
}
sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
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);
no_timer:
srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
spin_lock(&vcpu->arch.local_int.float_int->lock);
spin_lock_bh(&vcpu->arch.local_int.lock);
add_wait_queue(&vcpu->wq, &wait);
while (list_empty(&vcpu->arch.local_int.list) &&
list_empty(&vcpu->arch.local_int.float_int->list) &&
(!vcpu->arch.local_int.timer_due) &&
!signal_pending(current) &&
!kvm_s390_si_ext_call_pending(vcpu)) {
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_bh(&vcpu->arch.local_int.lock);
spin_unlock(&vcpu->arch.local_int.float_int->lock);
schedule();
spin_lock(&vcpu->arch.local_int.float_int->lock);
spin_lock_bh(&vcpu->arch.local_int.lock);
}
__unset_cpu_idle(vcpu);
__set_current_state(TASK_RUNNING);
remove_wait_queue(&vcpu->wq, &wait);
spin_unlock_bh(&vcpu->arch.local_int.lock);
spin_unlock(&vcpu->arch.local_int.float_int->lock);
vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
return 0;
}
void kvm_s390_tasklet(unsigned long parm)
{
struct kvm_vcpu *vcpu = (struct kvm_vcpu *) parm;
spin_lock(&vcpu->arch.local_int.lock);
vcpu->arch.local_int.timer_due = 1;
if (waitqueue_active(&vcpu->wq))
wake_up_interruptible(&vcpu->wq);
spin_unlock(&vcpu->arch.local_int.lock);
}
/*
* low level hrtimer wake routine. Because this runs in hardirq context
* we schedule a tasklet to do the real work.
*/
enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
{
struct kvm_vcpu *vcpu;
vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
vcpu->preempted = true;
tasklet_schedule(&vcpu->arch.tasklet);
return HRTIMER_NORESTART;
}
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;
spin_lock_bh(&li->lock);
list_for_each_entry_safe(inti, n, &li->list, list) {
list_del(&inti->list);
kfree(inti);
}
atomic_set(&li->active, 0);
spin_unlock_bh(&li->lock);
/* 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);
}
void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
{
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;
int deliver;
__reset_intercept_indicators(vcpu);
if (atomic_read(&li->active)) {
do {
deliver = 0;
spin_lock_bh(&li->lock);
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);
spin_unlock_bh(&li->lock);
if (deliver) {
__do_deliver_interrupt(vcpu, inti);
kfree(inti);
}
} while (deliver);
}
if (kvm_cpu_has_pending_timer(vcpu))
deliver_ckc_interrupt(vcpu);
if (atomic_read(&fi->active)) {
do {
deliver = 0;
spin_lock(&fi->lock);
list_for_each_entry_safe(inti, n, &fi->list, list) {
if (__interrupt_is_deliverable(vcpu, inti)) {
list_del(&inti->list);
fi->irq_count--;
deliver = 1;
break;
}
__set_intercept_indicator(vcpu, inti);
}
if (list_empty(&fi->list))
atomic_set(&fi->active, 0);
spin_unlock(&fi->lock);
if (deliver) {
__do_deliver_interrupt(vcpu, inti);
kfree(inti);
}
} while (deliver);
}
}
void kvm_s390_deliver_pending_machine_checks(struct kvm_vcpu *vcpu)
{
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;
int deliver;
__reset_intercept_indicators(vcpu);
if (atomic_read(&li->active)) {
do {
deliver = 0;
spin_lock_bh(&li->lock);
list_for_each_entry_safe(inti, n, &li->list, list) {
if ((inti->type == KVM_S390_MCHK) &&
__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);
spin_unlock_bh(&li->lock);
if (deliver) {
__do_deliver_interrupt(vcpu, inti);
kfree(inti);
}
} while (deliver);
}
if (atomic_read(&fi->active)) {
do {
deliver = 0;
spin_lock(&fi->lock);
list_for_each_entry_safe(inti, n, &fi->list, list) {
if ((inti->type == KVM_S390_MCHK) &&
__interrupt_is_deliverable(vcpu, inti)) {
list_del(&inti->list);
fi->irq_count--;
deliver = 1;
break;
}
__set_intercept_indicator(vcpu, inti);
}
if (list_empty(&fi->list))
atomic_set(&fi->active, 0);
spin_unlock(&fi->lock);
if (deliver) {
__do_deliver_interrupt(vcpu, inti);
kfree(inti);
}
} while (deliver);
}
}
int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
{
struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
struct kvm_s390_interrupt_info *inti;
inti = kzalloc(sizeof(*inti), GFP_KERNEL);
if (!inti)
return -ENOMEM;
inti->type = KVM_S390_PROGRAM_INT;
inti->pgm.code = code;
VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, inti->type, code, 0, 1);
spin_lock_bh(&li->lock);
list_add(&inti->list, &li->list);
atomic_set(&li->active, 1);
BUG_ON(waitqueue_active(li->wq));
spin_unlock_bh(&li->lock);
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;
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));
spin_lock_bh(&li->lock);
list_add(&inti->list, &li->list);
atomic_set(&li->active, 1);
BUG_ON(waitqueue_active(li->wq));
spin_unlock_bh(&li->lock);
return 0;
}
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;
if (cr6 &&
((cr6 & int_word_to_isc_bits(iter->io.io_int_word)) == 0))
continue;
if (schid) {
if (((schid & 0x00000000ffff0000) >> 16) !=
iter->io.subchannel_id)
continue;
if ((schid & 0x000000000000ffff) !=
iter->io.subchannel_nr)
continue;
}
inti = iter;
break;
}
if (inti) {
list_del_init(&inti->list);
fi->irq_count--;
}
if (list_empty(&fi->list))
atomic_set(&fi->active, 0);
spin_unlock(&fi->lock);
mutex_unlock(&kvm->lock);
return inti;
}
static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
{
struct kvm_s390_local_interrupt *li;
struct kvm_s390_float_interrupt *fi;
struct kvm_s390_interrupt_info *iter;
struct kvm_vcpu *dst_vcpu = NULL;
int sigcpu;
int rc = 0;
mutex_lock(&kvm->lock);
fi = &kvm->arch.float_int;
spin_lock(&fi->lock);
if (fi->irq_count >= KVM_S390_MAX_FLOAT_IRQS) {
rc = -EINVAL;
goto unlock_fi;
}
fi->irq_count++;
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;
} while (kvm_get_vcpu(kvm, sigcpu) == NULL);
}
dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
li = &dst_vcpu->arch.local_int;
spin_lock_bh(&li->lock);
atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
if (waitqueue_active(li->wq))
wake_up_interruptible(li->wq);
kvm_get_vcpu(kvm, sigcpu)->preempted = true;
spin_unlock_bh(&li->lock);
unlock_fi:
spin_unlock(&fi->lock);
mutex_unlock(&kvm->lock);
return rc;
}
int kvm_s390_inject_vm(struct kvm *kvm,
struct kvm_s390_interrupt *s390int)
{
struct kvm_s390_interrupt_info *inti;
inti = kzalloc(sizeof(*inti), GFP_KERNEL);
if (!inti)
return -ENOMEM;
inti->type = s390int->type;
switch (inti->type) {
case KVM_S390_INT_VIRTIO:
VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
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;
case KVM_S390_INT_PFAULT_DONE:
inti->type = s390int->type;
inti->ext.ext_params2 = s390int->parm64;
break;
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;
case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
if (inti->type & IOINT_AI_MASK)
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;
default:
kfree(inti);
return -EINVAL;
}
trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
2);
return __inject_vm(kvm, inti);
}
void kvm_s390_reinject_io_int(struct kvm *kvm,
struct kvm_s390_interrupt_info *inti)
{
__inject_vm(kvm, inti);
}
int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
struct kvm_s390_interrupt *s390int)
{
struct kvm_s390_local_interrupt *li;
struct kvm_s390_interrupt_info *inti;
inti = kzalloc(sizeof(*inti), GFP_KERNEL);
if (!inti)
return -ENOMEM;
switch (s390int->type) {
case KVM_S390_PROGRAM_INT:
if (s390int->parm & 0xffff0000) {
kfree(inti);
return -EINVAL;
}
inti->type = s390int->type;
inti->pgm.code = s390int->parm;
VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
s390int->parm);
break;
case KVM_S390_SIGP_SET_PREFIX:
inti->prefix.address = s390int->parm;
inti->type = s390int->type;
VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
s390int->parm);
break;
case KVM_S390_SIGP_STOP:
case KVM_S390_RESTART:
case KVM_S390_INT_CLOCK_COMP:
case KVM_S390_INT_CPU_TIMER:
VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
inti->type = s390int->type;
break;
case KVM_S390_INT_EXTERNAL_CALL:
if (s390int->parm & 0xffff0000) {
kfree(inti);
return -EINVAL;
}
VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
s390int->parm);
inti->type = s390int->type;
inti->extcall.code = s390int->parm;
break;
case KVM_S390_INT_EMERGENCY:
if (s390int->parm & 0xffff0000) {
kfree(inti);
return -EINVAL;
}
VCPU_EVENT(vcpu, 3, "inject: emergency %u\n", s390int->parm);
inti->type = s390int->type;
inti->emerg.code = s390int->parm;
break;
case KVM_S390_MCHK:
VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx",
s390int->parm64);
inti->type = s390int->type;
inti->mchk.mcic = s390int->parm64;
break;
case KVM_S390_INT_PFAULT_INIT:
inti->type = s390int->type;
inti->ext.ext_params2 = s390int->parm64;
break;
case KVM_S390_INT_VIRTIO:
case KVM_S390_INT_SERVICE:
case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
default:
kfree(inti);
return -EINVAL;
}
trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type, s390int->parm,
s390int->parm64, 2);
mutex_lock(&vcpu->kvm->lock);
li = &vcpu->arch.local_int;
spin_lock_bh(&li->lock);
if (inti->type == KVM_S390_PROGRAM_INT)
list_add(&inti->list, &li->list);
else
list_add_tail(&inti->list, &li->list);
atomic_set(&li->active, 1);
if (inti->type == KVM_S390_SIGP_STOP)
li->action_bits |= ACTION_STOP_ON_STOP;
atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
if (waitqueue_active(&vcpu->wq))
wake_up_interruptible(&vcpu->wq);
vcpu->preempted = true;
spin_unlock_bh(&li->lock);
mutex_unlock(&vcpu->kvm->lock);
return 0;
}
void kvm_s390_clear_float_irqs(struct kvm *kvm)
{
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);
}
fi->irq_count = 0;
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) {
case KVM_S390_INT_PFAULT_INIT:
case KVM_S390_INT_PFAULT_DONE:
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) {
case KVM_S390_INT_PFAULT_INIT:
case KVM_S390_INT_PFAULT_DONE:
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;
}
r = __inject_vm(dev->kvm, inti);
if (r) {
kfree(inti);
return r;
}
len -= sizeof(struct kvm_s390_irq);
attr->addr += sizeof(struct kvm_s390_irq);
}
return r;
}
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;
map->addr = gmap_translate(addr, kvm->arch.gmap);
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;
}
static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
int r = 0;
unsigned int i;
struct kvm_vcpu *vcpu;
switch (attr->group) {
case KVM_DEV_FLIC_ENQUEUE:
r = enqueue_floating_irq(dev, attr);
break;
case KVM_DEV_FLIC_CLEAR_IRQS:
r = 0;
kvm_s390_clear_float_irqs(dev->kvm);
break;
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;
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;
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,
};
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;
}
int kvm_set_routing_entry(struct kvm_irq_routing_table *rt,
struct kvm_kernel_irq_routing_entry *e,
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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