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-rw-r--r--Documentation/virtual/kvm/devices/s390_flic.txt20
-rw-r--r--arch/s390/include/asm/kvm_host.h10
-rw-r--r--arch/s390/include/uapi/asm/kvm.h6
-rw-r--r--arch/s390/kvm/interrupt.c43
-rw-r--r--arch/s390/kvm/kvm-s390.c4
-rw-r--r--arch/s390/kvm/trace-s390.h31
6 files changed, 114 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/devices/s390_flic.txt b/Documentation/virtual/kvm/devices/s390_flic.txt
index e8ee3b6edb05..dfd42fd4abd5 100644
--- a/Documentation/virtual/kvm/devices/s390_flic.txt
+++ b/Documentation/virtual/kvm/devices/s390_flic.txt
@@ -14,6 +14,7 @@ FLIC provides support to
- purge one pending floating I/O interrupt (KVM_DEV_FLIC_CLEAR_IO_IRQ)
- enable/disable for the guest transparent async page faults
- register and modify adapter interrupt sources (KVM_DEV_FLIC_ADAPTER_*)
+- modify AIS (adapter-interruption-suppression) mode state (KVM_DEV_FLIC_AISM)
Groups:
KVM_DEV_FLIC_ENQUEUE
@@ -107,6 +108,25 @@ struct kvm_s390_io_adapter_req {
release a userspace page for the translated address specified in addr
from the list of mappings
+ KVM_DEV_FLIC_AISM
+ modify the adapter-interruption-suppression mode for a given isc if the
+ AIS capability is enabled. Takes a kvm_s390_ais_req describing:
+
+struct kvm_s390_ais_req {
+ __u8 isc;
+ __u16 mode;
+};
+
+ isc contains the target I/O interruption subclass, mode the target
+ adapter-interruption-suppression mode. The following modes are
+ currently supported:
+ - KVM_S390_AIS_MODE_ALL: ALL-Interruptions Mode, i.e. airq injection
+ is always allowed;
+ - KVM_S390_AIS_MODE_SINGLE: SINGLE-Interruption Mode, i.e. airq
+ injection is only allowed once and the following adapter interrupts
+ will be suppressed until the mode is set again to ALL-Interruptions
+ or SINGLE-Interruption mode.
+
Note: The KVM_SET_DEVICE_ATTR/KVM_GET_DEVICE_ATTR device ioctls executed on
FLIC with an unknown group or attribute gives the error code EINVAL (instead of
ENXIO, as specified in the API documentation). It is not possible to conclude
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 499c72c2280d..552c319483c6 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -521,6 +521,12 @@ struct kvm_s390_local_interrupt {
#define FIRQ_CNTR_PFAULT 3
#define FIRQ_MAX_COUNT 4
+/* mask the AIS mode for a given ISC */
+#define AIS_MODE_MASK(isc) (0x80 >> isc)
+
+#define KVM_S390_AIS_MODE_ALL 0
+#define KVM_S390_AIS_MODE_SINGLE 1
+
struct kvm_s390_float_interrupt {
unsigned long pending_irqs;
spinlock_t lock;
@@ -530,6 +536,10 @@ struct kvm_s390_float_interrupt {
struct kvm_s390_ext_info srv_signal;
int next_rr_cpu;
unsigned long idle_mask[BITS_TO_LONGS(KVM_MAX_VCPUS)];
+ struct mutex ais_lock;
+ u8 simm;
+ u8 nimm;
+ int ais_enabled;
};
struct kvm_hw_wp_info_arch {
diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/asm/kvm.h
index 5fa144d1df0a..50d2a927c990 100644
--- a/arch/s390/include/uapi/asm/kvm.h
+++ b/arch/s390/include/uapi/asm/kvm.h
@@ -26,6 +26,7 @@
#define KVM_DEV_FLIC_ADAPTER_REGISTER 6
#define KVM_DEV_FLIC_ADAPTER_MODIFY 7
#define KVM_DEV_FLIC_CLEAR_IO_IRQ 8
+#define KVM_DEV_FLIC_AISM 9
/*
* We can have up to 4*64k pending subchannels + 8 adapter interrupts,
* as well as up to ASYNC_PF_PER_VCPU*KVM_MAX_VCPUS pfault done interrupts.
@@ -46,6 +47,11 @@ struct kvm_s390_io_adapter {
#define KVM_S390_ADAPTER_SUPPRESSIBLE 0x01
+struct kvm_s390_ais_req {
+ __u8 isc;
+ __u16 mode;
+};
+
#define KVM_S390_IO_ADAPTER_MASK 1
#define KVM_S390_IO_ADAPTER_MAP 2
#define KVM_S390_IO_ADAPTER_UNMAP 3
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index dba51ad62570..96b689e48c08 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -2152,6 +2152,45 @@ static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
return 0;
}
+static int modify_ais_mode(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+ struct kvm_s390_ais_req req;
+ int ret = 0;
+
+ if (!fi->ais_enabled)
+ return -ENOTSUPP;
+
+ if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
+ return -EFAULT;
+
+ if (req.isc > MAX_ISC)
+ return -EINVAL;
+
+ trace_kvm_s390_modify_ais_mode(req.isc,
+ (fi->simm & AIS_MODE_MASK(req.isc)) ?
+ (fi->nimm & AIS_MODE_MASK(req.isc)) ?
+ 2 : KVM_S390_AIS_MODE_SINGLE :
+ KVM_S390_AIS_MODE_ALL, req.mode);
+
+ mutex_lock(&fi->ais_lock);
+ switch (req.mode) {
+ case KVM_S390_AIS_MODE_ALL:
+ fi->simm &= ~AIS_MODE_MASK(req.isc);
+ fi->nimm &= ~AIS_MODE_MASK(req.isc);
+ break;
+ case KVM_S390_AIS_MODE_SINGLE:
+ fi->simm |= AIS_MODE_MASK(req.isc);
+ fi->nimm &= ~AIS_MODE_MASK(req.isc);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ mutex_unlock(&fi->ais_lock);
+
+ return ret;
+}
+
static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
int r = 0;
@@ -2188,6 +2227,9 @@ static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
case KVM_DEV_FLIC_CLEAR_IO_IRQ:
r = clear_io_irq(dev->kvm, attr);
break;
+ case KVM_DEV_FLIC_AISM:
+ r = modify_ais_mode(dev->kvm, attr);
+ break;
default:
r = -EINVAL;
}
@@ -2207,6 +2249,7 @@ static int flic_has_attr(struct kvm_device *dev,
case KVM_DEV_FLIC_ADAPTER_REGISTER:
case KVM_DEV_FLIC_ADAPTER_MODIFY:
case KVM_DEV_FLIC_CLEAR_IO_IRQ:
+ case KVM_DEV_FLIC_AISM:
return 0;
}
return -ENXIO;
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index f83f18b77f3d..977cc1660a83 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -1515,6 +1515,10 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
kvm_s390_crypto_init(kvm);
+ mutex_init(&kvm->arch.float_int.ais_lock);
+ kvm->arch.float_int.simm = 0;
+ kvm->arch.float_int.nimm = 0;
+ kvm->arch.float_int.ais_enabled = 0;
spin_lock_init(&kvm->arch.float_int.lock);
for (i = 0; i < FIRQ_LIST_COUNT; i++)
INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
diff --git a/arch/s390/kvm/trace-s390.h b/arch/s390/kvm/trace-s390.h
index 396485bca191..b32994d1546a 100644
--- a/arch/s390/kvm/trace-s390.h
+++ b/arch/s390/kvm/trace-s390.h
@@ -280,6 +280,37 @@ TRACE_EVENT(kvm_s390_enable_disable_ibs,
__entry->state ? "enabling" : "disabling", __entry->id)
);
+/*
+ * Trace point for modifying ais mode for a given isc.
+ */
+TRACE_EVENT(kvm_s390_modify_ais_mode,
+ TP_PROTO(__u8 isc, __u16 from, __u16 to),
+ TP_ARGS(isc, from, to),
+
+ TP_STRUCT__entry(
+ __field(__u8, isc)
+ __field(__u16, from)
+ __field(__u16, to)
+ ),
+
+ TP_fast_assign(
+ __entry->isc = isc;
+ __entry->from = from;
+ __entry->to = to;
+ ),
+
+ TP_printk("for isc %x, modifying interruption mode from %s to %s",
+ __entry->isc,
+ (__entry->from == KVM_S390_AIS_MODE_ALL) ?
+ "ALL-Interruptions Mode" :
+ (__entry->from == KVM_S390_AIS_MODE_SINGLE) ?
+ "Single-Interruption Mode" : "No-Interruptions Mode",
+ (__entry->to == KVM_S390_AIS_MODE_ALL) ?
+ "ALL-Interruptions Mode" :
+ (__entry->to == KVM_S390_AIS_MODE_SINGLE) ?
+ "Single-Interruption Mode" : "No-Interruptions Mode")
+ );
+
#endif /* _TRACE_KVMS390_H */
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-06-27 00:35:26 +0200