[PATCH V2 25/40] arm: split pending SPIs (global) out from pending PPIs and SGIs (per CPU)

[Ian Campbell <ian.campbell@citrix.com>]

This tracks SPIs in struct arch_domain and PPIs+SGIs in struct arch_vcpu which
seems more logical.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
---
 xen/arch/arm/vgic.c          |   12 +++++++-----
 xen/include/asm-arm/domain.h |   10 ++++++++++
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/xen/arch/arm/vgic.c b/xen/arch/arm/vgic.c
index 629a0da..af3523f 100644
--- a/xen/arch/arm/vgic.c
+++ b/xen/arch/arm/vgic.c
@@ -82,9 +82,8 @@ int domain_vgic_init(struct domain *d)
     d->arch.vgic.shared_irqs =
         xmalloc_array(struct vgic_irq_rank, DOMAIN_NR_RANKS(d));
     d->arch.vgic.pending_irqs =
-        xmalloc_array(struct pending_irq,
-                d->arch.vgic.nr_lines + (32 * d->max_vcpus));
-    for (i=0; i<d->arch.vgic.nr_lines + (32 * d->max_vcpus); i++)
+        xzalloc_array(struct pending_irq, d->arch.vgic.nr_lines);
+    for (i=0; i<d->arch.vgic.nr_lines; i++)
         INIT_LIST_HEAD(&d->arch.vgic.pending_irqs[i].inflight);
     for (i=0; i<DOMAIN_NR_RANKS(d); i++)
         spin_lock_init(&d->arch.vgic.shared_irqs[i].lock);
@@ -98,6 +97,10 @@ int vcpu_vgic_init(struct vcpu *v)
 
     spin_lock_init(&v->arch.vgic.private_irqs.lock);
 
+    memset(&v->arch.vgic.pending_irqs, 0, sizeof(v->arch.vgic.pending_irqs));
+    for (i = 0; i < 32; i++)
+        INIT_LIST_HEAD(&v->arch.vgic.pending_irqs[i].inflight);
+
     /* For SGI and PPI the target is always this CPU */
     for ( i = 0 ; i < 8 ; i++ )
         v->arch.vgic.private_irqs.itargets[i] =
@@ -535,8 +538,7 @@ struct pending_irq *irq_to_pending(struct vcpu *v, unsigned int irq)
     /* Pending irqs allocation strategy: the first vgic.nr_lines irqs
      * are used for SPIs; the rests are used for per cpu irqs */
     if ( irq < 32 )
-        n = &v->domain->arch.vgic.pending_irqs[irq + (v->vcpu_id * 32)
-            + v->domain->arch.vgic.nr_lines];
+        n = &v->arch.vgic.pending_irqs[irq];
     else
         n = &v->domain->arch.vgic.pending_irqs[irq - 32];
     return n;
diff --git a/xen/include/asm-arm/domain.h b/xen/include/asm-arm/domain.h
index 620b26e..32deb52 100644
--- a/xen/include/asm-arm/domain.h
+++ b/xen/include/asm-arm/domain.h
@@ -46,6 +46,10 @@ struct arch_domain
         int ctlr;
         int nr_lines;
         struct vgic_irq_rank *shared_irqs;
+        /*
+         * SPIs are domain global, SGIs and PPIs are per-VCPU and stored in
+         * struct arch_vcpu.
+         */
         struct pending_irq *pending_irqs;
     } vgic;
 
@@ -114,7 +118,13 @@ struct arch_vcpu
     uint32_t gic_lr[64];
 
     struct {
+        /*
+         * SGIs and PPIs are per-VCPU, SPIs are domain global and in
+         * struct arch_domain.
+         */
+        struct pending_irq pending_irqs[32];
         struct vgic_irq_rank private_irqs;
+
         /* This list is ordered by IRQ priority and it is used to keep
          * track of the IRQs that the VGIC injected into the guest.
          * Depending on the availability of LR registers, the IRQs might
-- 
1.7.9.1