Merge branch 'next' (accumulated 3.16 merge window patches) into master

[karo-tx-linux.git] / virt / kvm / irqchip.c

diff --git a/virt/kvm/irqchip.c b/virt/kvm/irqchip.c
index 20dc9e4a8f6cee7b6d86a6decc92410715c9264c..b43c275775cd5a1d9e5bbc7f842ceaa81f2a0c69 100644 (file)
--- 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;