[Xen-changelog] [xen master] xen/arm: send IPIs to inject irqs into guest vcpus running on different pcpus

[patchbot@xxxxxxx]

commit 0c899a9f6fa9272c74ccdb659bcbfc0e74dcef45
Author:     Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
AuthorDate: Wed May 8 12:41:11 2013 +0100
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Wed May 8 12:59:30 2013 +0100

    xen/arm: send IPIs to inject irqs into guest vcpus running on different 
pcpus
    
    If we need to inject an irq into a VCPU that is running on a different
    processor, we shouldn't just enqueue the irq into the lr_pending and
    inflight lists and wait for something to interrupt the guest execution.
    Send an IPI to the target pcpu so that Xen can inject the new interrupt
    returning to guest.
    
    Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 xen/arch/arm/vgic.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/xen/arch/arm/vgic.c b/xen/arch/arm/vgic.c
index 5d242c8..0e9cc4a 100644
--- a/xen/arch/arm/vgic.c
+++ b/xen/arch/arm/vgic.c
@@ -648,6 +648,7 @@ void vgic_vcpu_inject_irq(struct vcpu *v, unsigned int irq, 
int virtual)
     struct vgic_irq_rank *rank = vgic_irq_rank(v, 8, idx);
     struct pending_irq *iter, *n = irq_to_pending(v, irq);
     unsigned long flags;
+    bool_t running;
 
     spin_lock_irqsave(&v->arch.vgic.lock, flags);
 
@@ -683,7 +684,10 @@ void vgic_vcpu_inject_irq(struct vcpu *v, unsigned int 
irq, int virtual)
 out:
     spin_unlock_irqrestore(&v->arch.vgic.lock, flags);
     /* we have a new higher priority irq, inject it into the guest */
+    running = v->is_running;
     vcpu_unblock(v);
+    if ( running && v != current )
+        smp_send_event_check_mask(cpumask_of(v->processor));
 }
 
 /*
--
generated by git-patchbot for /home/xen/git/xen.git#master

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