KVM: Move all accesses to kvm::irq_routing into irqchip.c

Now that struct _irqfd does not keep a reference to storage pointed
to by the irq_routing field of struct kvm, we can move the statement
that updates it out from under the irqfds.lock and put it in
kvm_set_irq_routing() instead.  That means we then have to take a
srcu_read_lock on kvm->irq_srcu around the irqfd_update call in
kvm_irqfd_assign(), since holding the kvm->irqfds.lock no longer
ensures that that the routing can't change.

Combined with changing kvm_irq_map_gsi() and kvm_irq_map_chip_pin()
to take a struct kvm * argument instead of the pointer to the routing
table, this allows us to to move all references to kvm->irq_routing
into irqchip.c.  That in turn allows us to move the definition of the
kvm_irq_routing_table struct into irqchip.c as well.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Tested-by: Eric Auger <eric.auger@linaro.org>
Tested-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 25 insertions, 14 deletions

diff --git a/virt/kvm/irqchip.c b/virt/kvm/irqchip.c
index f4648dd94888..04faac50cef5 100644
--- a/virt/kvm/irqchip.c
+++ b/virt/kvm/irqchip.c
@@ -31,12 +31,26 @@
 #include <trace/events/kvm.h>
 #include "irq.h"
 
-int kvm_irq_map_gsi(struct kvm_kernel_irq_routing_entry *entries,
-                    struct kvm_irq_routing_table *irq_rt, int gsi)
+struct kvm_irq_routing_table {
+        int chip[KVM_NR_IRQCHIPS][KVM_IRQCHIP_NUM_PINS];
+        struct kvm_kernel_irq_routing_entry *rt_entries;
+        u32 nr_rt_entries;
+        /*
+         * Array indexed by gsi. Each entry contains list of irq chips
+         * the gsi is connected to.
+         */
+        struct hlist_head map[0];
+};
+
+int kvm_irq_map_gsi(struct kvm *kvm,
+                    struct kvm_kernel_irq_routing_entry *entries, int gsi)
 {
+        struct kvm_irq_routing_table *irq_rt;
         struct kvm_kernel_irq_routing_entry *e;
         int n = 0;
 
+        irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu,
+                                        lockdep_is_held(&kvm->irq_lock));
         if (gsi < irq_rt->nr_rt_entries) {
                 hlist_for_each_entry(e, &irq_rt->map[gsi], link) {
                         entries[n] = *e;
@@ -47,21 +61,21 @@ int kvm_irq_map_gsi(struct kvm_kernel_irq_routing_entry *entries,
         return n;
 }
 
-int kvm_irq_map_chip_pin(struct kvm_irq_routing_table *irq_rt,
-                         unsigned irqchip, unsigned pin)
+int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin)
 {
+        struct kvm_irq_routing_table *irq_rt;
+
+        irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
         return irq_rt->chip[irqchip][pin];
 }
 
 bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin)
 {
-        struct kvm_irq_routing_table *irq_rt;
         struct kvm_irq_ack_notifier *kian;
         int gsi, idx;
 
         idx = srcu_read_lock(&kvm->irq_srcu);
-        irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
-        gsi = kvm_irq_map_chip_pin(irq_rt, irqchip, pin);
+        gsi = kvm_irq_map_chip_pin(kvm, irqchip, pin);
         if (gsi != -1)
                 hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list,
                                          link)
@@ -78,15 +92,13 @@ EXPORT_SYMBOL_GPL(kvm_irq_has_notifier);
 
 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
 {
-        struct kvm_irq_routing_table *irq_rt;
         struct kvm_irq_ack_notifier *kian;
         int gsi, idx;
 
         trace_kvm_ack_irq(irqchip, pin);
 
         idx = srcu_read_lock(&kvm->irq_srcu);
-        irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
-        gsi = kvm_irq_map_chip_pin(irq_rt, irqchip, pin);
+        gsi = kvm_irq_map_chip_pin(kvm, irqchip, pin);
         if (gsi != -1)
                 hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list,
                                          link)
@@ -143,7 +155,6 @@ int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
 {
         struct kvm_kernel_irq_routing_entry irq_set[KVM_NR_IRQCHIPS];
         int ret = -1, i, idx;
-        struct kvm_irq_routing_table *irq_rt;
 
         trace_kvm_set_irq(irq, level, irq_source_id);
 
@@ -152,8 +163,7 @@ int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
          * writes to the unused one.
          */
         idx = srcu_read_lock(&kvm->irq_srcu);
-        irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
-        i = kvm_irq_map_gsi(irq_set, irq_rt, irq);
+        i = kvm_irq_map_gsi(kvm, irq_set, irq);
         srcu_read_unlock(&kvm->irq_srcu, idx);
 
         while(i--) {
@@ -250,7 +260,8 @@ int kvm_set_irq_routing(struct kvm *kvm,
 
         mutex_lock(&kvm->irq_lock);
         old = kvm->irq_routing;
-        kvm_irq_routing_update(kvm, new);
+        rcu_assign_pointer(kvm->irq_routing, new);
+        kvm_irq_routing_update(kvm);
         mutex_unlock(&kvm->irq_lock);
 
         synchronize_srcu_expedited(&kvm->irq_srcu);