[Xen-changelog] [xen master] xen: remove workaround to inject evtchn_irq on irq enable

[patchbot@xxxxxxx]

commit 07892f7fa14a51ef0378b415c151efa868419e30
Author:     Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
AuthorDate: Wed Aug 13 17:29:41 2014 +0100
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Wed Sep 3 15:23:26 2014 +0100

    xen: remove workaround to inject evtchn_irq on irq enable
    
    evtchn_upcall_pending is already set by common code at vcpu creation,
    therefore on ARM we also need to call vgic_vcpu_inject_irq for it.
    Currently we do that from vgic_enable_irqs as a workaround.
    
    Do this properly by introducing an appropriate arch specific hook:
    arch_evtchn_inject. arch_evtchn_inject is called by map_vcpu_info to
    inject the evtchn irq into the guest. On ARM is implemented by calling
    vgic_vcpu_inject_irq.
    
    On x86 guests typically don't call VCPUOP_register_vcpu_info on vcpu0,
    therefore avoiding the issue. However theoretically they could call
    VCPUOP_register_vcpu_info on vcpu0 and in that case Xen would need to
    inject the event channel notification into the guest if the guest is
    HVM. So implement arch_evtchn_inject on x86 by calling
    hvm_assert_evtchn_irq.
    
    Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>
---
 xen/arch/arm/vgic.c     |   23 +++++++++--------------
 xen/arch/x86/hvm/irq.c  |    6 ++++++
 xen/common/domain.c     |    1 +
 xen/include/xen/event.h |    3 +++
 4 files changed, 19 insertions(+), 14 deletions(-)

diff --git a/xen/arch/arm/vgic.c b/xen/arch/arm/vgic.c
index 2319d71..3cf5e7b 100644
--- a/xen/arch/arm/vgic.c
+++ b/xen/arch/arm/vgic.c
@@ -264,20 +264,10 @@ void vgic_enable_irqs(struct vcpu *v, uint32_t r, int n)
         v_target = d->arch.vgic.handler->get_target_vcpu(v, irq);
         p = irq_to_pending(v_target, irq);
         set_bit(GIC_IRQ_GUEST_ENABLED, &p->status);
-        /* We need to force the first injection of evtchn_irq because
-         * evtchn_upcall_pending is already set by common code on vcpu
-         * creation. */
-        if ( irq == v_target->domain->arch.evtchn_irq &&
-             vcpu_info(current, evtchn_upcall_pending) &&
-             list_empty(&p->inflight) )
-            vgic_vcpu_inject_irq(v_target, irq);
-        else {
-            unsigned long flags;
-            spin_lock_irqsave(&v_target->arch.vgic.lock, flags);
-            if ( !list_empty(&p->inflight) && !test_bit(GIC_IRQ_GUEST_VISIBLE, 
&p->status) )
-                gic_raise_guest_irq(v_target, irq, p->priority);
-            spin_unlock_irqrestore(&v_target->arch.vgic.lock, flags);
-        }
+        spin_lock_irqsave(&v_target->arch.vgic.lock, flags);
+        if ( !list_empty(&p->inflight) && !test_bit(GIC_IRQ_GUEST_VISIBLE, 
&p->status) )
+            gic_raise_guest_irq(v_target, irq, p->priority);
+        spin_unlock_irqrestore(&v_target->arch.vgic.lock, flags);
         if ( p->desc != NULL )
         {
             irq_set_affinity(p->desc, cpumask_of(v_target->processor));
@@ -433,6 +423,11 @@ void vgic_vcpu_inject_spi(struct domain *d, unsigned int 
irq)
     vgic_vcpu_inject_irq(v, irq);
 }
 
+void arch_evtchn_inject(struct vcpu *v)
+{
+    vgic_vcpu_inject_irq(v, v->domain->arch.evtchn_irq);
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/arch/x86/hvm/irq.c b/xen/arch/x86/hvm/irq.c
index 3b29678..35f4f94 100644
--- a/xen/arch/x86/hvm/irq.c
+++ b/xen/arch/x86/hvm/irq.c
@@ -468,6 +468,12 @@ int hvm_local_events_need_delivery(struct vcpu *v)
     return !hvm_interrupt_blocked(v, intack);
 }
 
+void arch_evtchn_inject(struct vcpu *v)
+{
+    if ( has_hvm_container_vcpu(v) )
+        hvm_assert_evtchn_irq(v);
+}
+
 static void irq_dump(struct domain *d)
 {
     struct hvm_irq *hvm_irq = &d->arch.hvm_domain.irq;
diff --git a/xen/common/domain.c b/xen/common/domain.c
index 1952070..e6b4ae6 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -1102,6 +1102,7 @@ int map_vcpu_info(struct vcpu *v, unsigned long gfn, 
unsigned offset)
     vcpu_info(v, evtchn_upcall_pending) = 1;
     for ( i = 0; i < BITS_PER_EVTCHN_WORD(d); i++ )
         set_bit(i, &vcpu_info(v, evtchn_pending_sel));
+    arch_evtchn_inject(v);
 
     return 0;
 }
diff --git a/xen/include/xen/event.h b/xen/include/xen/event.h
index 06c0654..88526f8 100644
--- a/xen/include/xen/event.h
+++ b/xen/include/xen/event.h
@@ -69,6 +69,9 @@ int guest_enabled_event(struct vcpu *v, uint32_t virq);
 /* Notify remote end of a Xen-attached event channel.*/
 void notify_via_xen_event_channel(struct domain *ld, int lport);
 
+/* Inject an event channel notification into the guest */
+void arch_evtchn_inject(struct vcpu *v);
+
 /*
  * Internal event channel object storage.
  *
--
generated by git-patchbot for /home/xen/git/xen.git#master

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