[Xen-changelog] [xen master] xen/arm: set GICH_HCR_UIE if all the LRs are in use

[patchbot@xxxxxxx]

commit 596f885a3202159ee16cfe96d2cbfce4b348af52
Author:     Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
AuthorDate: Tue Jun 10 15:07:11 2014 +0100
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Wed Jun 18 11:29:56 2014 +0100

    xen/arm: set GICH_HCR_UIE if all the LRs are in use
    
    On return to guest, if there are no free LRs and we still have more
    interrupt to inject, set GICH_HCR_UIE so that we are going to receive a
    maintenance interrupt when no pending interrupts are present in the LR
    registers.
    The maintenance interrupt handler won't do anything anymore, but
    receiving the interrupt is going to cause gic_inject to be called on
    return to guest that is going to clear the old LRs and inject new
    interrupts.
    
    Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
    Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 xen/arch/arm/gic.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
index f441a83..d455031 100644
--- a/xen/arch/arm/gic.c
+++ b/xen/arch/arm/gic.c
@@ -55,6 +55,7 @@ static struct {
 static DEFINE_PER_CPU(uint64_t, lr_mask);
 
 static unsigned nr_lrs;
+#define lr_all_full() (this_cpu(lr_mask) == ((1 << nr_lrs) - 1))
 
 /* The GIC mapping of CPU interfaces does not necessarily match the
  * logical CPU numbering. Let's use mapping as returned by the GIC
@@ -661,6 +662,13 @@ void gic_inject(void)
         vgic_vcpu_inject_irq(current, current->domain->arch.evtchn_irq);
 
     gic_restore_pending_irqs(current);
+
+
+    if ( !list_empty(&current->arch.vgic.lr_pending) && lr_all_full() )
+        GICH[GICH_HCR] |= GICH_HCR_UIE;
+    else
+        GICH[GICH_HCR] &= ~GICH_HCR_UIE;
+
 }
 
 static void do_sgi(struct cpu_user_regs *regs, int othercpu, enum gic_sgi sgi)
--
generated by git-patchbot for /home/xen/git/xen.git#master

_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxx
http://lists.xensource.com/xen-changelog