* [PATCH v8 1/3] KVM: s390: Add map/unmap ioctl and clean mappings post-guest
2026-05-26 1:53 [PATCH v8 0/3] KVM: s390: Introducing kvm_arch_set_irq_inatomic Fast Inject Douglas Freimuth
@ 2026-05-26 1:53 ` Douglas Freimuth
2026-05-28 13:52 ` Matthew Rosato
2026-05-26 1:53 ` [PATCH v8 2/3] KVM: s390: Enable adapter_indicators_set to use mapped pages Douglas Freimuth
2026-05-26 1:53 ` [PATCH v8 3/3] KVM: s390: Introducing kvm_arch_set_irq_inatomic fast inject Douglas Freimuth
2 siblings, 1 reply; 7+ messages in thread
From: Douglas Freimuth @ 2026-05-26 1:53 UTC (permalink / raw)
To: borntraeger, imbrenda, frankja, david, hca, gor, agordeev, svens,
kvm, linux-s390, linux-kernel
Cc: mjrosato, freimuth
s390 needs map/unmap ioctls, which map the adapter set
indicator pages, so the pages can be accessed when interrupts are
disabled. The mappings are cleaned up when the guest is removed.
pin_user_pages_remote is used for both the ioctl as well
as the pin-on-demand logic in adapter_indicators_set().
Map/Unmap ioctls are fenced in order to avoid the longterm pinning
in Secure Execution environments. In Secure Execution
environments the path of execution available before this patch is followed.
Statistical counters to count map/unmap functions for adapter indicator
pages are added. The counters can be used to analyze
map/unmap functions in non-Secure Execution environments and similarly
can be used to analyze Secure Execution environments where the counters
will not be incremented as the adapter indicator pages are not mapped.
Signed-off-by: Douglas Freimuth <freimuth@linux.ibm.com>
---
arch/s390/include/asm/kvm_host.h | 5 +
arch/s390/kvm/interrupt.c | 194 ++++++++++++++++++++++++++-----
arch/s390/kvm/kvm-s390.c | 3 +
arch/s390/kvm/kvm-s390.h | 2 +
4 files changed, 174 insertions(+), 30 deletions(-)
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 8a4f4a39f7a2..0056cc9414a0 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -448,6 +448,8 @@ struct kvm_vcpu_arch {
struct kvm_vm_stat {
struct kvm_vm_stat_generic generic;
u64 inject_io;
+ u64 io_390_adapter_map;
+ u64 io_390_adapter_unmap;
u64 inject_float_mchk;
u64 inject_pfault_done;
u64 inject_service_signal;
@@ -479,6 +481,9 @@ struct s390_io_adapter {
bool masked;
bool swap;
bool suppressible;
+ spinlock_t maps_lock;
+ struct list_head maps;
+ unsigned int nr_maps;
};
#define MAX_S390_IO_ADAPTERS ((MAX_ISC + 1) * 8)
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 3bcdbbbb6891..8c44ed20651b 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -2412,6 +2412,7 @@ static int register_io_adapter(struct kvm_device *dev,
struct s390_io_adapter *adapter;
struct kvm_s390_io_adapter adapter_info;
+ mutex_lock(&dev->kvm->lock);
if (copy_from_user(&adapter_info,
(void __user *)attr->addr, sizeof(adapter_info)))
return -EFAULT;
@@ -2429,6 +2430,9 @@ static int register_io_adapter(struct kvm_device *dev,
if (!adapter)
return -ENOMEM;
+ INIT_LIST_HEAD(&adapter->maps);
+ spin_lock_init(&adapter->maps_lock);
+ adapter->nr_maps = 0;
adapter->id = adapter_info.id;
adapter->isc = adapter_info.isc;
adapter->maskable = adapter_info.maskable;
@@ -2437,6 +2441,7 @@ static int register_io_adapter(struct kvm_device *dev,
adapter->suppressible = (adapter_info.flags) &
KVM_S390_ADAPTER_SUPPRESSIBLE;
dev->kvm->arch.adapters[adapter->id] = adapter;
+ mutex_unlock(&dev->kvm->lock);
return 0;
}
@@ -2453,12 +2458,151 @@ int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
return ret;
}
+static struct page *pin_map_page(struct kvm *kvm, u64 uaddr,
+ unsigned int gup_flags)
+{
+ struct mm_struct *mm = kvm->mm;
+ struct page *page = NULL;
+ int locked = 1;
+
+ if (mmget_not_zero(mm)) {
+ mmap_read_lock(mm);
+ pin_user_pages_remote(mm, uaddr, 1, FOLL_WRITE | gup_flags,
+ &page, &locked);
+ if (locked)
+ mmap_read_unlock(mm);
+ mmput(mm);
+ }
+
+ return page;
+}
+
+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;
+ unsigned long flags;
+ __u64 host_addr;
+ int ret, idx;
+
+ if (!adapter || !addr)
+ return -EINVAL;
+
+ map = kzalloc_obj(*map, GFP_KERNEL_ACCOUNT);
+ if (!map)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&map->list);
+ idx = srcu_read_lock(&kvm->srcu);
+ host_addr = gpa_to_hva(kvm, addr);
+ if (kvm_is_error_hva(host_addr)) {
+ srcu_read_unlock(&kvm->srcu, idx);
+ ret = -EFAULT;
+ goto out;
+ }
+ srcu_read_unlock(&kvm->srcu, idx);
+ map->guest_addr = addr;
+ map->addr = host_addr;
+ map->page = pin_map_page(kvm, host_addr, FOLL_LONGTERM);
+ if (!map->page) {
+ ret = -EINVAL;
+ goto out;
+ }
+ spin_lock_irqsave(&adapter->maps_lock, flags);
+ if (adapter->nr_maps < MAX_S390_ADAPTER_MAPS) {
+ list_add_tail(&map->list, &adapter->maps);
+ adapter->nr_maps++;
+ ret = 0;
+ } else {
+ ret = -EINVAL;
+ }
+ spin_unlock_irqrestore(&adapter->maps_lock, flags);
+ if (ret)
+ unpin_user_page(map->page);
+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, *map_to_free;
+ struct page *map_page_to_put = NULL;
+ u64 map_addr_to_mark = 0;
+ unsigned long flags;
+ int found = 0, idx;
+
+ if (!adapter || !addr)
+ return -EINVAL;
+
+ spin_lock_irqsave(&adapter->maps_lock, flags);
+ list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
+ if (map->guest_addr == addr) {
+ found = 1;
+ adapter->nr_maps--;
+ list_del(&map->list);
+ map_page_to_put = map->page;
+ map_addr_to_mark = map->guest_addr;
+ map_to_free = map;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&adapter->maps_lock, flags);
+
+ if (found) {
+ kfree(map_to_free);
+ idx = srcu_read_lock(&kvm->srcu);
+ mark_page_dirty(kvm, map_addr_to_mark >> PAGE_SHIFT);
+ set_page_dirty_lock(map_page_to_put);
+ srcu_read_unlock(&kvm->srcu, idx);
+ unpin_user_page(map_page_to_put);
+ }
+
+ return found ? 0 : -ENOENT;
+}
+
+void kvm_s390_unmap_all_adapters(struct kvm *kvm)
+{
+ struct s390_map_info *map, *tmp;
+ unsigned long flags;
+ int i, idx;
+
+ for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
+ struct s390_io_adapter *adapter = kvm->arch.adapters[i];
+ LIST_HEAD(local_list);
+
+ if (!adapter)
+ continue;
+
+ spin_lock_irqsave(&adapter->maps_lock, flags);
+ list_splice_init(&adapter->maps, &local_list);
+ adapter->nr_maps = 0;
+ spin_unlock_irqrestore(&adapter->maps_lock, flags);
+
+ list_for_each_entry_safe(map, tmp, &local_list, list) {
+ list_del(&map->list);
+ idx = srcu_read_lock(&kvm->srcu);
+ mark_page_dirty(kvm, map->guest_addr >> PAGE_SHIFT);
+ set_page_dirty_lock(map->page);
+ srcu_read_unlock(&kvm->srcu, idx);
+ unpin_user_page(map->page);
+ kfree(map);
+ }
+ }
+}
+
void kvm_s390_destroy_adapters(struct kvm *kvm)
{
int i;
- for (i = 0; i < MAX_S390_IO_ADAPTERS; i++)
+ kvm_s390_unmap_all_adapters(kvm);
+
+ for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
kfree(kvm->arch.adapters[i]);
+ kvm->arch.adapters[i] = NULL;
+ }
}
static int modify_io_adapter(struct kvm_device *dev,
@@ -2480,14 +2624,22 @@ static int modify_io_adapter(struct kvm_device *dev,
if (ret > 0)
ret = 0;
break;
- /*
- * The following operations are no longer needed and therefore no-ops.
- * The gpa to hva translation is done when an IRQ route is set up. The
- * set_irq code uses get_user_pages_remote() to do the actual write.
- */
case KVM_S390_IO_ADAPTER_MAP:
case KVM_S390_IO_ADAPTER_UNMAP:
- ret = 0;
+ /* If in Secure Execution mode do not long term pin. */
+ mutex_lock(&dev->kvm->lock);
+ if (kvm_s390_pv_is_protected(dev->kvm)) {
+ mutex_unlock(&dev->kvm->lock);
+ return 0;
+ }
+ if (req.type == KVM_S390_IO_ADAPTER_MAP) {
+ dev->kvm->stat.io_390_adapter_map++;
+ ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
+ } else {
+ dev->kvm->stat.io_390_adapter_unmap++;
+ ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
+ }
+ mutex_unlock(&dev->kvm->lock);
break;
default:
ret = -EINVAL;
@@ -2733,24 +2885,6 @@ static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
}
-static struct page *get_map_page(struct kvm *kvm, u64 uaddr)
-{
- struct mm_struct *mm = kvm->mm;
- struct page *page = NULL;
- int locked = 1;
-
- if (mmget_not_zero(mm)) {
- mmap_read_lock(mm);
- get_user_pages_remote(mm, uaddr, 1, FOLL_WRITE,
- &page, &locked);
- if (locked)
- mmap_read_unlock(mm);
- mmput(mm);
- }
-
- return page;
-}
-
static int adapter_indicators_set(struct kvm *kvm,
struct s390_io_adapter *adapter,
struct kvm_s390_adapter_int *adapter_int)
@@ -2760,12 +2894,12 @@ static int adapter_indicators_set(struct kvm *kvm,
struct page *ind_page, *summary_page;
void *map;
- ind_page = get_map_page(kvm, adapter_int->ind_addr);
+ ind_page = pin_map_page(kvm, adapter_int->ind_addr, 0);
if (!ind_page)
return -1;
- summary_page = get_map_page(kvm, adapter_int->summary_addr);
+ summary_page = pin_map_page(kvm, adapter_int->summary_addr, 0);
if (!summary_page) {
- put_page(ind_page);
+ unpin_user_page(ind_page);
return -1;
}
@@ -2784,8 +2918,8 @@ static int adapter_indicators_set(struct kvm *kvm,
set_page_dirty_lock(summary_page);
srcu_read_unlock(&kvm->srcu, idx);
- put_page(ind_page);
- put_page(summary_page);
+ unpin_user_page(ind_page);
+ unpin_user_page(summary_page);
return summary_set ? 0 : 1;
}
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index e09960c2e6ed..0d39c1375de2 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -68,6 +68,8 @@
const struct kvm_stats_desc kvm_vm_stats_desc[] = {
KVM_GENERIC_VM_STATS(),
STATS_DESC_COUNTER(VM, inject_io),
+ STATS_DESC_COUNTER(VM, io_390_adapter_map),
+ STATS_DESC_COUNTER(VM, io_390_adapter_unmap),
STATS_DESC_COUNTER(VM, inject_float_mchk),
STATS_DESC_COUNTER(VM, inject_pfault_done),
STATS_DESC_COUNTER(VM, inject_service_signal),
@@ -2513,6 +2515,7 @@ static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd)
if (kvm_s390_pv_is_protected(kvm))
break;
+ kvm_s390_unmap_all_adapters(kvm);
mmap_write_lock(kvm->mm);
/*
* Disable creation of new THPs. Existing THPs can stay, they
diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
index dc0573b7aa4b..7ba885cb6bd1 100644
--- a/arch/s390/kvm/kvm-s390.h
+++ b/arch/s390/kvm/kvm-s390.h
@@ -560,6 +560,8 @@ void kvm_s390_gisa_disable(struct kvm *kvm);
void kvm_s390_gisa_enable(struct kvm *kvm);
int __init kvm_s390_gib_init(u8 nisc);
void kvm_s390_gib_destroy(void);
+void kvm_s390_unmap_all_adapters(struct kvm *kvm);
+
/* implemented in guestdbg.c */
void kvm_s390_backup_guest_per_regs(struct kvm_vcpu *vcpu);
--
2.54.0
^ permalink raw reply [flat|nested] 7+ messages in thread* [PATCH v8 3/3] KVM: s390: Introducing kvm_arch_set_irq_inatomic fast inject
2026-05-26 1:53 [PATCH v8 0/3] KVM: s390: Introducing kvm_arch_set_irq_inatomic Fast Inject Douglas Freimuth
2026-05-26 1:53 ` [PATCH v8 1/3] KVM: s390: Add map/unmap ioctl and clean mappings post-guest Douglas Freimuth
2026-05-26 1:53 ` [PATCH v8 2/3] KVM: s390: Enable adapter_indicators_set to use mapped pages Douglas Freimuth
@ 2026-05-26 1:53 ` Douglas Freimuth
2026-05-28 16:06 ` Matthew Rosato
2 siblings, 1 reply; 7+ messages in thread
From: Douglas Freimuth @ 2026-05-26 1:53 UTC (permalink / raw)
To: borntraeger, imbrenda, frankja, david, hca, gor, agordeev, svens,
kvm, linux-s390, linux-kernel
Cc: mjrosato, freimuth
s390 needs a fast path for irq injection, and along those lines we
introduce kvm_arch_set_irq_inatomic. Instead of placing all interrupts on
the global work queue as it does today, this patch provides a fast path for
irq injection.
The inatomic fast path cannot lose control since it is running with
interrupts disabled. This meant making the following changes that exist on
the slow path today. First, the adapter_indicators page needs to be mapped
since it is accessed with interrupts disabled, so we added map/unmap
functions. Second, access to shared resources between the fast and slow
paths needed to be changed from mutex and semaphores to spin_lock's.
Finally, the memory allocation on the slow path utilizes GFP_KERNEL_ACCOUNT
but we had to implement the fast path with GFP_ATOMIC allocation. Each of
these enhancements were required to prevent blocking on the fast inject
path.
Fencing of Fast Inject in Secure Execution environments is enabled in the
patch series by not mapping adapter indicator pages. In Secure Execution
environments the path of execution available before this patch is followed.
Statistical counters have been added to enable analysis of irq injection on
the fast path and slow path including io_390_inatomic, io_flic_inject_airq,
io_set_adapter_int and io_390_inatomic_adapter_masked_or_coalesced.
Signed-off-by: Douglas Freimuth <freimuth@linux.ibm.com>
---
arch/s390/include/asm/kvm_host.h | 6 +-
arch/s390/kvm/intercept.c | 5 +-
arch/s390/kvm/interrupt.c | 264 ++++++++++++++++++++++++-------
arch/s390/kvm/kvm-s390.c | 27 +++-
arch/s390/kvm/kvm-s390.h | 3 +-
5 files changed, 240 insertions(+), 65 deletions(-)
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 0056cc9414a0..f0b77cdbb52b 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -359,7 +359,7 @@ struct kvm_s390_float_interrupt {
struct kvm_s390_mchk_info mchk;
struct kvm_s390_ext_info srv_signal;
int last_sleep_cpu;
- struct mutex ais_lock;
+ spinlock_t ais_lock;
u8 simm;
u8 nimm;
};
@@ -450,6 +450,10 @@ struct kvm_vm_stat {
u64 inject_io;
u64 io_390_adapter_map;
u64 io_390_adapter_unmap;
+ u64 io_390_inatomic;
+ u64 io_flic_inject_airq;
+ u64 io_set_adapter_int;
+ u64 io_390_inatomic_adapter_masked_or_coalesced;
u64 inject_float_mchk;
u64 inject_pfault_done;
u64 inject_service_signal;
diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
index 39aff324203e..1980df61ef30 100644
--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -517,8 +517,9 @@ static int handle_pv_spx(struct kvm_vcpu *vcpu)
static int handle_pv_sclp(struct kvm_vcpu *vcpu)
{
struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
+ unsigned long flags;
- spin_lock(&fi->lock);
+ spin_lock_irqsave(&fi->lock, flags);
/*
* 2 cases:
* a: an sccb answering interrupt was already pending or in flight.
@@ -534,7 +535,7 @@ static int handle_pv_sclp(struct kvm_vcpu *vcpu)
fi->srv_signal.ext_params |= 0x43000;
set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
clear_bit(IRQ_PEND_EXT_SERVICE, &fi->masked_irqs);
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
return 0;
}
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 23f578e7b9dc..1aedeeeedf9e 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -624,8 +624,9 @@ static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
struct kvm_s390_mchk_info mchk = {};
int deliver = 0;
int rc = 0;
+ unsigned long flags;
- spin_lock(&fi->lock);
+ spin_lock_irqsave(&fi->lock, flags);
spin_lock(&li->lock);
if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
@@ -654,7 +655,7 @@ static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
deliver = 1;
}
spin_unlock(&li->lock);
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
if (deliver) {
VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
@@ -941,11 +942,12 @@ static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
{
struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
struct kvm_s390_ext_info ext;
+ unsigned long flags;
- spin_lock(&fi->lock);
+ spin_lock_irqsave(&fi->lock, flags);
if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->masked_irqs) ||
!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
return 0;
}
ext = fi->srv_signal;
@@ -954,7 +956,7 @@ static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
clear_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs);
if (kvm_s390_pv_cpu_is_protected(vcpu))
set_bit(IRQ_PEND_EXT_SERVICE, &fi->masked_irqs);
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
if (!ext.ext_params)
return 0;
@@ -972,17 +974,18 @@ static int __must_check __deliver_service_ev(struct kvm_vcpu *vcpu)
{
struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
struct kvm_s390_ext_info ext;
+ unsigned long flags;
- spin_lock(&fi->lock);
+ spin_lock_irqsave(&fi->lock, flags);
if (!(test_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs))) {
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
return 0;
}
ext = fi->srv_signal;
/* only clear the event bits */
fi->srv_signal.ext_params &= ~SCCB_EVENT_PENDING;
clear_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs);
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
VCPU_EVENT(vcpu, 4, "%s", "deliver: sclp parameter event");
vcpu->stat.deliver_service_signal++;
@@ -997,8 +1000,9 @@ static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
struct kvm_s390_interrupt_info *inti;
int rc = 0;
+ unsigned long flags;
- spin_lock(&fi->lock);
+ spin_lock_irqsave(&fi->lock, flags);
inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
struct kvm_s390_interrupt_info,
list);
@@ -1008,7 +1012,7 @@ static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
}
if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
if (inti) {
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
@@ -1039,8 +1043,9 @@ static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
struct kvm_s390_interrupt_info *inti;
int rc = 0;
+ unsigned long flags;
- spin_lock(&fi->lock);
+ spin_lock_irqsave(&fi->lock, flags);
inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
struct kvm_s390_interrupt_info,
list);
@@ -1058,7 +1063,7 @@ static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
}
if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
if (inti) {
rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
@@ -1116,10 +1121,11 @@ static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
struct kvm_s390_io_info io;
u32 isc;
int rc = 0;
+ unsigned long flags;
fi = &vcpu->kvm->arch.float_int;
- spin_lock(&fi->lock);
+ spin_lock_irqsave(&fi->lock, flags);
isc = irq_type_to_isc(irq_type);
isc_list = &fi->lists[isc];
inti = list_first_entry_or_null(isc_list,
@@ -1146,7 +1152,7 @@ static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
}
if (list_empty(isc_list))
clear_bit(irq_type, &fi->pending_irqs);
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
if (inti) {
rc = __do_deliver_io(vcpu, &(inti->io));
@@ -1662,8 +1668,9 @@ static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
struct kvm_s390_interrupt_info *iter;
u16 id = (schid & 0xffff0000U) >> 16;
u16 nr = schid & 0x0000ffffU;
+ unsigned long flags;
- spin_lock(&fi->lock);
+ spin_lock_irqsave(&fi->lock, flags);
list_for_each_entry(iter, isc_list, list) {
if (schid && (id != iter->io.subchannel_id ||
nr != iter->io.subchannel_nr))
@@ -1673,10 +1680,10 @@ static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
fi->counters[FIRQ_CNTR_IO] -= 1;
if (list_empty(isc_list))
clear_bit(isc_to_irq_type(isc), &fi->pending_irqs);
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
return iter;
}
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
return NULL;
}
@@ -1769,9 +1776,10 @@ static int __inject_service(struct kvm *kvm,
struct kvm_s390_interrupt_info *inti)
{
struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+ unsigned long flags;
kvm->stat.inject_service_signal++;
- spin_lock(&fi->lock);
+ spin_lock_irqsave(&fi->lock, flags);
fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
/* We always allow events, track them separately from the sccb ints */
@@ -1791,7 +1799,7 @@ static int __inject_service(struct kvm *kvm,
fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
out:
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
kfree(inti);
return 0;
}
@@ -1800,17 +1808,18 @@ static int __inject_virtio(struct kvm *kvm,
struct kvm_s390_interrupt_info *inti)
{
struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+ unsigned long flags;
kvm->stat.inject_virtio++;
- spin_lock(&fi->lock);
+ spin_lock_irqsave(&fi->lock, flags);
if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
return -EBUSY;
}
fi->counters[FIRQ_CNTR_VIRTIO] += 1;
list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
return 0;
}
@@ -1818,18 +1827,19 @@ static int __inject_pfault_done(struct kvm *kvm,
struct kvm_s390_interrupt_info *inti)
{
struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+ unsigned long flags;
kvm->stat.inject_pfault_done++;
- spin_lock(&fi->lock);
+ spin_lock_irqsave(&fi->lock, flags);
if (fi->counters[FIRQ_CNTR_PFAULT] >=
(ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
return -EBUSY;
}
fi->counters[FIRQ_CNTR_PFAULT] += 1;
list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
return 0;
}
@@ -1838,13 +1848,14 @@ static int __inject_float_mchk(struct kvm *kvm,
struct kvm_s390_interrupt_info *inti)
{
struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+ unsigned long flags;
kvm->stat.inject_float_mchk++;
- spin_lock(&fi->lock);
+ spin_lock_irqsave(&fi->lock, flags);
fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
fi->mchk.mcic |= inti->mchk.mcic;
set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
kfree(inti);
return 0;
}
@@ -1855,6 +1866,7 @@ static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
struct kvm_s390_float_interrupt *fi;
struct list_head *list;
int isc;
+ unsigned long flags;
kvm->stat.inject_io++;
isc = int_word_to_isc(inti->io.io_int_word);
@@ -1873,9 +1885,9 @@ static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
}
fi = &kvm->arch.float_int;
- spin_lock(&fi->lock);
+ spin_lock_irqsave(&fi->lock, flags);
if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
return -EBUSY;
}
fi->counters[FIRQ_CNTR_IO] += 1;
@@ -1890,7 +1902,7 @@ static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
list_add_tail(&inti->list, list);
set_bit(isc_to_irq_type(isc), &fi->pending_irqs);
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
return 0;
}
@@ -1966,15 +1978,10 @@ static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
}
int kvm_s390_inject_vm(struct kvm *kvm,
- struct kvm_s390_interrupt *s390int)
+ struct kvm_s390_interrupt *s390int, struct kvm_s390_interrupt_info *inti)
{
- struct kvm_s390_interrupt_info *inti;
int rc;
- inti = kzalloc_obj(*inti, GFP_KERNEL_ACCOUNT);
- if (!inti)
- return -ENOMEM;
-
inti->type = s390int->type;
switch (inti->type) {
case KVM_S390_INT_VIRTIO:
@@ -2003,15 +2010,13 @@ int kvm_s390_inject_vm(struct kvm *kvm,
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);
rc = __inject_vm(kvm, inti);
- if (rc)
- kfree(inti);
+
return rc;
}
@@ -2176,12 +2181,13 @@ void kvm_s390_clear_float_irqs(struct kvm *kvm)
{
struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
int i;
+ unsigned long flags;
mutex_lock(&kvm->lock);
if (!kvm_s390_pv_is_protected(kvm))
fi->masked_irqs = 0;
mutex_unlock(&kvm->lock);
- spin_lock(&fi->lock);
+ spin_lock_irqsave(&fi->lock, flags);
fi->pending_irqs = 0;
memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
memset(&fi->mchk, 0, sizeof(fi->mchk));
@@ -2189,7 +2195,7 @@ void kvm_s390_clear_float_irqs(struct kvm *kvm)
clear_irq_list(&fi->lists[i]);
for (i = 0; i < FIRQ_MAX_COUNT; i++)
fi->counters[i] = 0;
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
kvm_s390_gisa_clear(kvm);
};
@@ -2204,6 +2210,7 @@ static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
int ret = 0;
int n = 0;
int i;
+ unsigned long flags;
if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
return -EINVAL;
@@ -2235,7 +2242,7 @@ static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
}
}
fi = &kvm->arch.float_int;
- spin_lock(&fi->lock);
+ spin_lock_irqsave(&fi->lock, flags);
for (i = 0; i < FIRQ_LIST_COUNT; i++) {
list_for_each_entry(inti, &fi->lists[i], list) {
if (n == max_irqs) {
@@ -2272,7 +2279,7 @@ static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
}
out:
- spin_unlock(&fi->lock);
+ spin_unlock_irqrestore(&fi->lock, flags);
out_nolock:
if (!ret && n > 0) {
if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
@@ -2287,6 +2294,7 @@ static int flic_ais_mode_get_all(struct kvm *kvm, struct kvm_device_attr *attr)
{
struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
struct kvm_s390_ais_all ais;
+ unsigned long flags;
if (attr->attr < sizeof(ais))
return -EINVAL;
@@ -2294,10 +2302,10 @@ static int flic_ais_mode_get_all(struct kvm *kvm, struct kvm_device_attr *attr)
if (!test_kvm_facility(kvm, 72))
return -EOPNOTSUPP;
- mutex_lock(&fi->ais_lock);
+ spin_lock_irqsave(&fi->ais_lock, flags);
ais.simm = fi->simm;
ais.nimm = fi->nimm;
- mutex_unlock(&fi->ais_lock);
+ spin_unlock_irqrestore(&fi->ais_lock, flags);
if (copy_to_user((void __user *)attr->addr, &ais, sizeof(ais)))
return -EFAULT;
@@ -2676,6 +2684,7 @@ 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;
+ unsigned long flags;
if (!test_kvm_facility(kvm, 72))
return -EOPNOTSUPP;
@@ -2692,7 +2701,7 @@ static int modify_ais_mode(struct kvm *kvm, struct kvm_device_attr *attr)
2 : KVM_S390_AIS_MODE_SINGLE :
KVM_S390_AIS_MODE_ALL, req.mode);
- mutex_lock(&fi->ais_lock);
+ spin_lock_irqsave(&fi->ais_lock, flags);
switch (req.mode) {
case KVM_S390_AIS_MODE_ALL:
fi->simm &= ~AIS_MODE_MASK(req.isc);
@@ -2705,7 +2714,7 @@ static int modify_ais_mode(struct kvm *kvm, struct kvm_device_attr *attr)
default:
ret = -EINVAL;
}
- mutex_unlock(&fi->ais_lock);
+ spin_unlock_irqrestore(&fi->ais_lock, flags);
return ret;
}
@@ -2719,25 +2728,41 @@ static int kvm_s390_inject_airq(struct kvm *kvm,
.parm = 0,
.parm64 = isc_to_int_word(adapter->isc),
};
+ struct kvm_s390_interrupt_info *inti;
+ unsigned long flags;
+
int ret = 0;
- if (!test_kvm_facility(kvm, 72) || !adapter->suppressible)
- return kvm_s390_inject_vm(kvm, &s390int);
+ inti = kzalloc_obj(*inti, GFP_KERNEL_ACCOUNT);
+ if (!inti)
+ return -ENOMEM;
- mutex_lock(&fi->ais_lock);
+ if (!test_kvm_facility(kvm, 72) || !adapter->suppressible) {
+ ret = kvm_s390_inject_vm(kvm, &s390int, inti);
+ if (ret)
+ kfree(inti);
+ return ret;
+ }
+
+ spin_lock_irqsave(&fi->ais_lock, flags);
if (fi->nimm & AIS_MODE_MASK(adapter->isc)) {
trace_kvm_s390_airq_suppressed(adapter->id, adapter->isc);
- goto out;
+ spin_unlock_irqrestore(&fi->ais_lock, flags);
+ kfree(inti);
+ return ret;
}
- ret = kvm_s390_inject_vm(kvm, &s390int);
+ ret = kvm_s390_inject_vm(kvm, &s390int, inti);
+
if (!ret && (fi->simm & AIS_MODE_MASK(adapter->isc))) {
fi->nimm |= AIS_MODE_MASK(adapter->isc);
trace_kvm_s390_modify_ais_mode(adapter->isc,
KVM_S390_AIS_MODE_SINGLE, 2);
}
-out:
- mutex_unlock(&fi->ais_lock);
+
+ spin_unlock_irqrestore(&fi->ais_lock, flags);
+ if (ret)
+ kfree(inti);
return ret;
}
@@ -2746,6 +2771,8 @@ static int flic_inject_airq(struct kvm *kvm, struct kvm_device_attr *attr)
unsigned int id = attr->attr;
struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
+ kvm->stat.io_flic_inject_airq++;
+
if (!adapter)
return -EINVAL;
@@ -2756,6 +2783,7 @@ static int flic_ais_mode_set_all(struct kvm *kvm, struct kvm_device_attr *attr)
{
struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
struct kvm_s390_ais_all ais;
+ unsigned long flags;
if (!test_kvm_facility(kvm, 72))
return -EOPNOTSUPP;
@@ -2763,10 +2791,10 @@ static int flic_ais_mode_set_all(struct kvm *kvm, struct kvm_device_attr *attr)
if (copy_from_user(&ais, (void __user *)attr->addr, sizeof(ais)))
return -EFAULT;
- mutex_lock(&fi->ais_lock);
+ spin_lock_irqsave(&fi->ais_lock, flags);
fi->simm = ais.simm;
fi->nimm = ais.nimm;
- mutex_unlock(&fi->ais_lock);
+ spin_unlock_irqrestore(&fi->ais_lock, flags);
return 0;
}
@@ -2935,6 +2963,7 @@ static int adapter_indicators_set(struct kvm *kvm,
set_bit(bit, map);
spin_unlock_irqrestore(&adapter->maps_lock, flags);
}
+
spin_lock_irqsave(&adapter->maps_lock, flags);
summary_info = get_map_info(adapter, adapter_int->summary_addr);
if (!summary_info) {
@@ -2962,6 +2991,44 @@ static int adapter_indicators_set(struct kvm *kvm,
return summary_set ? 0 : 1;
}
+static int adapter_indicators_set_fast(struct kvm *kvm,
+ struct s390_io_adapter *adapter,
+ struct kvm_s390_adapter_int *adapter_int,
+ int setbit)
+{
+ unsigned long bit;
+ int summary_set;
+ struct s390_map_info *ind_info, *summary_info;
+ void *map;
+
+ spin_lock(&adapter->maps_lock);
+ ind_info = get_map_info(adapter, adapter_int->ind_addr);
+ if (!ind_info) {
+ spin_unlock(&adapter->maps_lock);
+ return -EWOULDBLOCK;
+ }
+ map = page_address(ind_info->page);
+ bit = get_ind_bit(ind_info->addr, adapter_int->ind_offset, adapter->swap);
+ if (setbit)
+ set_bit(bit, map);
+ summary_info = get_map_info(adapter, adapter_int->summary_addr);
+ if (!summary_info) {
+ spin_unlock(&adapter->maps_lock);
+ return -EWOULDBLOCK;
+ }
+ map = page_address(summary_info->page);
+ bit = get_ind_bit(summary_info->addr, adapter_int->summary_offset,
+ adapter->swap);
+ /* If setbit then set summary bit. Else if falling back to the slow path */
+ /* with setbit==0 then clear the summary bit so the slow path re-injects */
+ if (setbit)
+ summary_set = test_and_set_bit(bit, map);
+ else
+ summary_set = test_and_clear_bit(bit, map);
+ spin_unlock(&adapter->maps_lock);
+ return summary_set ? 0 : 1;
+}
+
/*
* < 0 - not injected due to error
* = 0 - coalesced, summary indicator already active
@@ -2974,6 +3041,8 @@ static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
int ret;
struct s390_io_adapter *adapter;
+ kvm->stat.io_set_adapter_int++;
+
/* We're only interested in the 0->1 transition. */
if (!level)
return 0;
@@ -3042,7 +3111,6 @@ int kvm_set_routing_entry(struct kvm *kvm,
int idx;
switch (ue->type) {
- /* we store the userspace addresses instead of the guest addresses */
case KVM_IRQ_ROUTING_S390_ADAPTER:
if (kvm_is_ucontrol(kvm))
return -EINVAL;
@@ -3632,3 +3700,85 @@ int __init kvm_s390_gib_init(u8 nisc)
out:
return rc;
}
+
+/*
+ * kvm_arch_set_irq_inatomic: fast-path for irqfd injection
+ */
+int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
+ struct kvm *kvm, int irq_source_id, int level,
+ bool line_status)
+{
+ int ret, setbit;
+ struct s390_io_adapter *adapter;
+ struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+ struct kvm_s390_interrupt_info *inti;
+ struct kvm_s390_interrupt s390int = {
+ .type = KVM_S390_INT_IO(1, 0, 0, 0),
+ .parm = 0,
+ };
+
+ kvm->stat.io_390_inatomic++;
+
+ /* We're only interested in the 0->1 transition. */
+ if (!level)
+ return 0;
+ if (e->type != KVM_IRQ_ROUTING_S390_ADAPTER)
+ return -EWOULDBLOCK;
+
+ adapter = get_io_adapter(kvm, e->adapter.adapter_id);
+ if (!adapter)
+ return -EWOULDBLOCK;
+
+ s390int.parm64 = isc_to_int_word(adapter->isc);
+ setbit = 1;
+ ret = adapter_indicators_set_fast(kvm, adapter, &e->adapter, setbit);
+ if (ret < 0)
+ return -EWOULDBLOCK;
+ if (!ret || adapter->masked) {
+ kvm->stat.io_390_inatomic_adapter_masked_or_coalesced++;
+ return 0;
+ }
+
+ inti = kzalloc_obj(*inti, GFP_ATOMIC);
+ if (!inti) {
+ setbit = 0;
+ adapter_indicators_set_fast(kvm, adapter, &e->adapter, setbit);
+ return -EWOULDBLOCK;
+ }
+
+ if (!test_kvm_facility(kvm, 72) || !adapter->suppressible) {
+ ret = kvm_s390_inject_vm(kvm, &s390int, inti);
+ if (ret == 0) {
+ return ret;
+ } else {
+ setbit = 0;
+ adapter_indicators_set_fast(kvm, adapter, &e->adapter, setbit);
+ kfree(inti);
+ return -EWOULDBLOCK;
+ }
+ }
+
+ spin_lock(&fi->ais_lock);
+ if (fi->nimm & AIS_MODE_MASK(adapter->isc)) {
+ trace_kvm_s390_airq_suppressed(adapter->id, adapter->isc);
+ spin_unlock(&fi->ais_lock);
+ kfree(inti);
+ return 0;
+ }
+
+ ret = kvm_s390_inject_vm(kvm, &s390int, inti);
+ if (!ret && (fi->simm & AIS_MODE_MASK(adapter->isc))) {
+ fi->nimm |= AIS_MODE_MASK(adapter->isc);
+ trace_kvm_s390_modify_ais_mode(adapter->isc,
+ KVM_S390_AIS_MODE_SINGLE, 2);
+ } else if (ret) {
+ spin_unlock(&fi->ais_lock);
+ setbit = 0;
+ adapter_indicators_set_fast(kvm, adapter, &e->adapter, setbit);
+ kfree(inti);
+ return -EWOULDBLOCK;
+ }
+
+ spin_unlock(&fi->ais_lock);
+ return 0;
+}
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 0d39c1375de2..d64eaa572e30 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -70,6 +70,10 @@ const struct kvm_stats_desc kvm_vm_stats_desc[] = {
STATS_DESC_COUNTER(VM, inject_io),
STATS_DESC_COUNTER(VM, io_390_adapter_map),
STATS_DESC_COUNTER(VM, io_390_adapter_unmap),
+ STATS_DESC_COUNTER(VM, io_390_inatomic),
+ STATS_DESC_COUNTER(VM, io_flic_inject_airq),
+ STATS_DESC_COUNTER(VM, io_set_adapter_int),
+ STATS_DESC_COUNTER(VM, io_390_inatomic_adapter_masked_or_coalesced),
STATS_DESC_COUNTER(VM, inject_float_mchk),
STATS_DESC_COUNTER(VM, inject_pfault_done),
STATS_DESC_COUNTER(VM, inject_service_signal),
@@ -2851,6 +2855,7 @@ int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
void __user *argp = (void __user *)arg;
struct kvm_device_attr attr;
int r;
+ struct kvm_s390_interrupt_info *inti;
switch (ioctl) {
case KVM_S390_INTERRUPT: {
@@ -2859,7 +2864,12 @@ int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
r = -EFAULT;
if (copy_from_user(&s390int, argp, sizeof(s390int)))
break;
- r = kvm_s390_inject_vm(kvm, &s390int);
+ inti = kzalloc_obj(*inti, GFP_KERNEL_ACCOUNT);
+ if (!inti)
+ return -ENOMEM;
+ r = kvm_s390_inject_vm(kvm, &s390int, inti);
+ if (r)
+ kfree(inti);
break;
}
case KVM_CREATE_IRQCHIP: {
@@ -3257,7 +3267,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
mutex_unlock(&kvm->lock);
}
- mutex_init(&kvm->arch.float_int.ais_lock);
+ spin_lock_init(&kvm->arch.float_int.ais_lock);
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]);
@@ -4379,19 +4389,28 @@ int kvm_s390_try_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clo
}
static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token,
- unsigned long token)
+ unsigned long token)
{
struct kvm_s390_interrupt inti;
struct kvm_s390_irq irq;
+ struct kvm_s390_interrupt_info *inti_mem = NULL;
+ int ret = 0;
if (start_token) {
irq.u.ext.ext_params2 = token;
irq.type = KVM_S390_INT_PFAULT_INIT;
WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq));
} else {
+ inti_mem = kzalloc_obj(*inti_mem, GFP_KERNEL_ACCOUNT);
+ if (WARN_ON_ONCE(!inti_mem))
+ return;
+
inti.type = KVM_S390_INT_PFAULT_DONE;
inti.parm64 = token;
- WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti));
+ ret = kvm_s390_inject_vm(vcpu->kvm, &inti, inti_mem);
+ if (ret)
+ kfree(inti_mem);
+ WARN_ON_ONCE(ret);
}
}
diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
index 7ba885cb6bd1..6d2842fb71a3 100644
--- a/arch/s390/kvm/kvm-s390.h
+++ b/arch/s390/kvm/kvm-s390.h
@@ -376,7 +376,8 @@ int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu);
void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu);
void kvm_s390_clear_float_irqs(struct kvm *kvm);
int __must_check kvm_s390_inject_vm(struct kvm *kvm,
- struct kvm_s390_interrupt *s390int);
+ struct kvm_s390_interrupt *s390int,
+ struct kvm_s390_interrupt_info *inti);
int __must_check kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
struct kvm_s390_irq *irq);
static inline int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
--
2.54.0
^ permalink raw reply [flat|nested] 7+ messages in thread