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Diffstat (limited to 'virt/kvm/irqchip.c')
-rw-r--r--virt/kvm/irqchip.c31
1 files changed, 16 insertions, 15 deletions
diff --git a/virt/kvm/irqchip.c b/virt/kvm/irqchip.c
index 20dc9e4a8f6c..b43c275775cd 100644
--- a/virt/kvm/irqchip.c
+++ b/virt/kvm/irqchip.c
@@ -26,6 +26,7 @@
#include <linux/kvm_host.h>
#include <linux/slab.h>
+#include <linux/srcu.h>
#include <linux/export.h>
#include <trace/events/kvm.h>
#include "irq.h"
@@ -33,19 +34,19 @@
bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin)
{
struct kvm_irq_ack_notifier *kian;
- int gsi;
+ int gsi, idx;
- rcu_read_lock();
- gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
+ idx = srcu_read_lock(&kvm->irq_srcu);
+ gsi = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu)->chip[irqchip][pin];
if (gsi != -1)
hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list,
link)
if (kian->gsi == gsi) {
- rcu_read_unlock();
+ srcu_read_unlock(&kvm->irq_srcu, idx);
return true;
}
- rcu_read_unlock();
+ srcu_read_unlock(&kvm->irq_srcu, idx);
return false;
}
@@ -54,18 +55,18 @@ EXPORT_SYMBOL_GPL(kvm_irq_has_notifier);
void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
{
struct kvm_irq_ack_notifier *kian;
- int gsi;
+ int gsi, idx;
trace_kvm_ack_irq(irqchip, pin);
- rcu_read_lock();
- gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
+ idx = srcu_read_lock(&kvm->irq_srcu);
+ gsi = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu)->chip[irqchip][pin];
if (gsi != -1)
hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list,
link)
if (kian->gsi == gsi)
kian->irq_acked(kian);
- rcu_read_unlock();
+ srcu_read_unlock(&kvm->irq_srcu, idx);
}
void kvm_register_irq_ack_notifier(struct kvm *kvm,
@@ -85,7 +86,7 @@ void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
mutex_lock(&kvm->irq_lock);
hlist_del_init_rcu(&kian->link);
mutex_unlock(&kvm->irq_lock);
- synchronize_rcu();
+ synchronize_srcu(&kvm->irq_srcu);
#ifdef __KVM_HAVE_IOAPIC
kvm_vcpu_request_scan_ioapic(kvm);
#endif
@@ -115,7 +116,7 @@ int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
bool line_status)
{
struct kvm_kernel_irq_routing_entry *e, irq_set[KVM_NR_IRQCHIPS];
- int ret = -1, i = 0;
+ int ret = -1, i = 0, idx;
struct kvm_irq_routing_table *irq_rt;
trace_kvm_set_irq(irq, level, irq_source_id);
@@ -124,12 +125,12 @@ int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
* IOAPIC. So set the bit in both. The guest will ignore
* writes to the unused one.
*/
- rcu_read_lock();
- irq_rt = rcu_dereference(kvm->irq_routing);
+ idx = srcu_read_lock(&kvm->irq_srcu);
+ irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
if (irq < irq_rt->nr_rt_entries)
hlist_for_each_entry(e, &irq_rt->map[irq], link)
irq_set[i++] = *e;
- rcu_read_unlock();
+ srcu_read_unlock(&kvm->irq_srcu, idx);
while(i--) {
int r;
@@ -226,7 +227,7 @@ int kvm_set_irq_routing(struct kvm *kvm,
kvm_irq_routing_update(kvm, new);
mutex_unlock(&kvm->irq_lock);
- synchronize_rcu();
+ synchronize_srcu_expedited(&kvm->irq_srcu);
new = old;
r = 0;