[Xen-devel] [PATCH 09/12] ARM: VGIC: rework events_need_delivery()

[Andre Przywara <andre.przywara@xxxxxxx>]

In event.h we very deeply dive into the VGIC to learn if an event for
a guest is pending.
Rework that function to abstract the VGIC specific part out. Also
reorder the queries there, as we only actually need to check for the
event channel if there are no other pending IRQs.

Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
---
 xen/arch/arm/vgic.c         | 11 +++++++++++
 xen/include/asm-arm/event.h | 13 +++----------
 xen/include/asm-arm/vgic.h  |  2 ++
 3 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/xen/arch/arm/vgic.c b/xen/arch/arm/vgic.c
index 37a083e804..f8d0f46e71 100644
--- a/xen/arch/arm/vgic.c
+++ b/xen/arch/arm/vgic.c
@@ -602,6 +602,17 @@ void arch_evtchn_inject(struct vcpu *v)
     vgic_vcpu_inject_irq(v, v->domain->arch.evtchn_irq);
 }
 
+bool vgic_evtchn_irq_pending(struct vcpu *v)
+{
+    struct pending_irq *p;
+
+    p = irq_to_pending(v, v->domain->arch.evtchn_irq);
+    /* Does not work for LPIs. */
+    ASSERT(!is_lpi(v->domain->arch.evtchn_irq));
+
+    return list_empty(&p->inflight);
+}
+
 bool vgic_emulate(struct cpu_user_regs *regs, union hsr hsr)
 {
     struct vcpu *v = current;
diff --git a/xen/include/asm-arm/event.h b/xen/include/asm-arm/event.h
index caefa506a9..67684e9763 100644
--- a/xen/include/asm-arm/event.h
+++ b/xen/include/asm-arm/event.h
@@ -16,12 +16,6 @@ static inline int vcpu_event_delivery_is_enabled(struct vcpu 
*v)
 
 static inline int local_events_need_delivery_nomask(void)
 {
-    struct pending_irq *p = irq_to_pending(current,
-                                           current->domain->arch.evtchn_irq);
-
-    /* Does not work for LPIs. */
-    ASSERT(!is_lpi(current->domain->arch.evtchn_irq));
-
     /* XXX: if the first interrupt has already been delivered, we should
      * check whether any other interrupts with priority higher than the
      * one in GICV_IAR are in the lr_pending queue or in the LR
@@ -33,11 +27,10 @@ static inline int local_events_need_delivery_nomask(void)
     if ( gic_events_need_delivery() )
         return 1;
 
-    if ( vcpu_info(current, evtchn_upcall_pending) &&
-        list_empty(&p->inflight) )
-        return 1;
+    if ( !vcpu_info(current, evtchn_upcall_pending) )
+        return 0;
 
-    return 0;
+    return vgic_evtchn_irq_pending(current);
 }
 
 static inline int local_events_need_delivery(void)
diff --git a/xen/include/asm-arm/vgic.h b/xen/include/asm-arm/vgic.h
index 49b8a4bec0..dcdb1acaf3 100644
--- a/xen/include/asm-arm/vgic.h
+++ b/xen/include/asm-arm/vgic.h
@@ -219,6 +219,8 @@ extern void register_vgic_ops(struct domain *d, const 
struct vgic_ops *ops);
 int vgic_v2_init(struct domain *d, int *mmio_count);
 int vgic_v3_init(struct domain *d, int *mmio_count);
 
+bool vgic_evtchn_irq_pending(struct vcpu *v);
+
 extern int domain_vgic_register(struct domain *d, int *mmio_count);
 extern int vcpu_vgic_free(struct vcpu *v);
 extern bool vgic_to_sgi(struct vcpu *v, register_t sgir,
-- 
2.14.1


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