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linux-pinenote/arch/s390/kvm/interrupt.c
Christian Borntraeger d0321a24bf KVM: s390: Use common waitqueue 
Lets use the common waitqueue for kvm cpus on s390. By itself it is
just a cleanup, but it should also improve the accuracy of diag 0x44
which is implemented via kvm_vcpu_on_spin. kvm_vcpu_on_spin has
an explicit check for waiting on the waitqueue to optimize the
yielding.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-06-17 17:09:17 +02:00

840 lines
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/*
* handling kvm guest interrupts
*
* Copyright IBM Corp. 2008
*
* 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/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 int is_ioint(u64 type)
{
return ((type & 0xfffe0000u) != 0xfffe0000u);
}
static 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 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_SERVICE:
if (psw_extint_disabled(vcpu))
return 0;
if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
return 1;
return 0;
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)
{
BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
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)
{
BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
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_ECALL_PEND |
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;
}
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_VIRTIO:
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 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(vcpu, 0x1201, (u16 __user *)__LC_EXT_INT_CODE);
rc |= put_guest(vcpu, inti->emerg.code,
(u16 __user *)__LC_EXT_CPU_ADDR);
rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
__LC_EXT_NEW_PSW, 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(vcpu, 0x1202, (u16 __user *)__LC_EXT_INT_CODE);
rc |= put_guest(vcpu, inti->extcall.code,
(u16 __user *)__LC_EXT_CPU_ADDR);
rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
__LC_EXT_NEW_PSW, sizeof(psw_t));
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(vcpu, 0x2401, (u16 __user *)__LC_EXT_INT_CODE);
rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
__LC_EXT_NEW_PSW, sizeof(psw_t));
rc |= put_guest(vcpu, inti->ext.ext_params,
(u32 __user *)__LC_EXT_PARAMS);
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(vcpu, 0x2603, (u16 __user *)__LC_EXT_INT_CODE);
rc |= put_guest(vcpu, 0x0d00, (u16 __user *)__LC_EXT_CPU_ADDR);
rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
__LC_EXT_NEW_PSW, sizeof(psw_t));
rc |= put_guest(vcpu, inti->ext.ext_params,
(u32 __user *)__LC_EXT_PARAMS);
rc |= put_guest(vcpu, inti->ext.ext_params2,
(u64 __user *)__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 = copy_to_guest(vcpu,
offsetof(struct _lowcore, restart_old_psw),
&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
offsetof(struct _lowcore, restart_psw),
sizeof(psw_t));
atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
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 = put_guest(vcpu, inti->pgm.code, (u16 __user *)__LC_PGM_INT_CODE);
rc |= put_guest(vcpu, table[vcpu->arch.sie_block->ipa >> 14],
(u16 __user *)__LC_PGM_ILC);
rc |= copy_to_guest(vcpu, __LC_PGM_OLD_PSW,
&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
__LC_PGM_NEW_PSW, sizeof(psw_t));
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(vcpu, inti->mchk.mcic, (u64 __user *) __LC_MCCK_CODE);
rc |= copy_to_guest(vcpu, __LC_MCK_OLD_PSW,
&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
__LC_MCK_NEW_PSW, 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(vcpu, inti->io.subchannel_id,
(u16 __user *) __LC_SUBCHANNEL_ID);
rc |= put_guest(vcpu, inti->io.subchannel_nr,
(u16 __user *) __LC_SUBCHANNEL_NR);
rc |= put_guest(vcpu, inti->io.io_int_parm,
(u32 __user *) __LC_IO_INT_PARM);
rc |= put_guest(vcpu, inti->io.io_int_word,
(u32 __user *) __LC_IO_INT_WORD);
rc |= copy_to_guest(vcpu, __LC_IO_OLD_PSW,
&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
__LC_IO_NEW_PSW, 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 int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
{
int rc;
if (psw_extint_disabled(vcpu))
return 0;
if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
return 0;
rc = put_guest(vcpu, 0x1004, (u16 __user *)__LC_EXT_INT_CODE);
rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
__LC_EXT_NEW_PSW, sizeof(psw_t));
if (rc) {
printk("kvm: The guest lowcore is not mapped during interrupt "
"delivery, killing userspace\n");
do_exit(SIGKILL);
}
return 1;
}
static 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) && (vcpu->arch.sie_block->ckc <
get_tod_clock() + vcpu->arch.sie_block->epoch)) {
if ((!psw_extint_disabled(vcpu)) &&
(vcpu->arch.sie_block->gcr[0] & 0x800ul))
rc = 1;
}
return rc;
}
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
return 0;
}
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 (psw_extint_disabled(vcpu) ||
(!(vcpu->arch.sie_block->gcr[0] & 0x800ul))) {
VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
goto no_timer;
}
now = get_tod_clock() + 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:
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)) {
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);
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);
tasklet_schedule(&vcpu->arch.tasklet);
return HRTIMER_NORESTART;
}
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 ((vcpu->arch.sie_block->ckc <
get_tod_clock() + vcpu->arch.sie_block->epoch))
__try_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);
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);
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;
}
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);
if (list_empty(&fi->list))
atomic_set(&fi->active, 0);
spin_unlock(&fi->lock);
mutex_unlock(&kvm->lock);
return inti;
}
int kvm_s390_inject_vm(struct kvm *kvm,
struct kvm_s390_interrupt *s390int)
{
struct kvm_s390_local_interrupt *li;
struct kvm_s390_float_interrupt *fi;
struct kvm_s390_interrupt_info *inti, *iter;
int sigcpu;
inti = kzalloc(sizeof(*inti), GFP_KERNEL);
if (!inti)
return -ENOMEM;
switch (s390int->type) {
case KVM_S390_INT_VIRTIO:
VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
s390int->parm, s390int->parm64);
inti->type = s390int->type;
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->type = s390int->type;
inti->ext.ext_params = s390int->parm;
break;
case KVM_S390_PROGRAM_INT:
case KVM_S390_SIGP_STOP:
case KVM_S390_INT_EXTERNAL_CALL:
case KVM_S390_INT_EMERGENCY:
kfree(inti);
return -EINVAL;
case KVM_S390_MCHK:
VM_EVENT(kvm, 5, "inject: machine check parm64:%llx",
s390int->parm64);
inti->type = s390int->type;
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 (s390int->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->type = s390int->type;
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);
mutex_lock(&kvm->lock);
fi = &kvm->arch.float_int;
spin_lock(&fi->lock);
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 (fi->local_int[sigcpu] == NULL);
}
li = fi->local_int[sigcpu];
spin_lock_bh(&li->lock);
atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
if (waitqueue_active(li->wq))
wake_up_interruptible(li->wq);
spin_unlock_bh(&li->lock);
spin_unlock(&fi->lock);
mutex_unlock(&kvm->lock);
return 0;
}
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:
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_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);
spin_unlock_bh(&li->lock);
mutex_unlock(&vcpu->kvm->lock);
return 0;
}
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