[Xen-devel] [PATCH] x86: allow IRQs to work without APIC again

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

Non-IO-APIC IRQs must get 1:1 mapped between domain PIRQ and Xen IRQ.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

--- 2009-09-21.orig/xen/arch/x86/domain.c       2009-07-10 13:58:50.000000000 
+0200
+++ 2009-09-21/xen/arch/x86/domain.c    2009-09-21 17:54:17.000000000 +0200
@@ -496,6 +496,10 @@ int arch_domain_create(struct domain *d,
         memset(d->arch.irq_pirq, 0,
                nr_irqs * sizeof(*d->arch.irq_pirq));
 
+        for ( i = 1; platform_legacy_irq(i); ++i )
+            if ( !IO_APIC_IRQ(i) )
+                d->arch.irq_pirq[i] = d->arch.pirq_irq[i] = i;
+
         if ( (rc = iommu_domain_init(d)) != 0 )
             goto fail;
 




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