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Diffstat (limited to 'arch/s390/kvm/interrupt.c')
-rw-r--r--arch/s390/kvm/interrupt.c389
1 files changed, 329 insertions, 60 deletions
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 5f79d2d79ca7..1848080c3f34 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -31,7 +31,7 @@ static int is_ioint(u64 type)
return ((type & 0xfffe0000u) != 0xfffe0000u);
}
-static int psw_extint_disabled(struct kvm_vcpu *vcpu)
+int psw_extint_disabled(struct kvm_vcpu *vcpu)
{
return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
}
@@ -78,11 +78,8 @@ static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
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_PFAULT_INIT:
+ case KVM_S390_INT_PFAULT_DONE:
case KVM_S390_INT_VIRTIO:
if (psw_extint_disabled(vcpu))
return 0;
@@ -150,6 +147,8 @@ static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
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:
if (psw_extint_disabled(vcpu))
__set_cpuflag(vcpu, CPUSTAT_EXT_INT);
@@ -223,6 +222,30 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
rc |= put_guest(vcpu, inti->ext.ext_params,
(u32 __user *)__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(vcpu, 0x2603, (u16 __user *) __LC_EXT_INT_CODE);
+ rc |= put_guest(vcpu, 0x0600, (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_params2,
+ (u64 __user *) __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(vcpu, 0x2603, (u16 __user *) __LC_EXT_INT_CODE);
+ rc |= put_guest(vcpu, 0x0680, (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_params2,
+ (u64 __user *) __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);
@@ -357,7 +380,7 @@ static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
return 1;
}
-static int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
+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;
@@ -528,6 +551,7 @@ void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
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;
}
@@ -583,6 +607,7 @@ void kvm_s390_deliver_pending_machine_checks(struct kvm_vcpu *vcpu)
if ((inti->type == KVM_S390_MCHK) &&
__interrupt_is_deliverable(vcpu, inti)) {
list_del(&inti->list);
+ fi->irq_count--;
deliver = 1;
break;
}
@@ -650,8 +675,10 @@ struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
inti = iter;
break;
}
- if (inti)
+ if (inti) {
list_del_init(&inti->list);
+ fi->irq_count--;
+ }
if (list_empty(&fi->list))
atomic_set(&fi->active, 0);
spin_unlock(&fi->lock);
@@ -659,53 +686,98 @@ struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
return inti;
}
-int kvm_s390_inject_vm(struct kvm *kvm,
- struct kvm_s390_interrupt *s390int)
+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 *inti, *iter;
+ struct kvm_s390_interrupt_info *iter;
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 (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);
+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;
- switch (s390int->type) {
+ 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->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_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->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)
+ 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->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;
@@ -718,43 +790,7 @@ int kvm_s390_inject_vm(struct kvm *kvm,
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;
+ return __inject_vm(kvm, inti);
}
int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
@@ -814,6 +850,10 @@ int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
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:
@@ -841,3 +881,232 @@ int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
mutex_unlock(&vcpu->kvm->lock);
return 0;
}
+
+static void clear_floating_interrupts(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 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;
+ clear_floating_interrupts(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;
+ 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,
+};
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-12-22 07:54:26 +0000