[Xen-devel] [PATCH] xen: hvm_domain_use_pirq return positive no matter if the evtchn is bound

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

xen: hvm_domain_use_pirq return positive no matter if the evtchn is bound

This patch fixes PV on HVM interrupt remapping with recent Linux kernels
and upstream qemu.
hvm_domain_use_pirq should return positive even if the evtchn is not
currently bound. If it doesn't assert_irq ends up injecting legacy
interrupts even after the guest disabled the irq.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

diff -r f9bb0bbea7c2 xen/arch/x86/irq.c
--- a/xen/arch/x86/irq.c        Thu May 12 16:42:54 2011 +0100
+++ b/xen/arch/x86/irq.c        Thu Jun 16 14:55:47 2011 +0000
@@ -1959,7 +1959,7 @@ int hvm_domain_use_pirq(struct domain *d
         return 0;
 
     emuirq = domain_pirq_to_emuirq(d, pirq);
-    if ( emuirq != IRQ_UNBOUND && d->pirq_to_evtchn[pirq] != 0 )
+    if ( emuirq != IRQ_UNBOUND )
         return 1;
     else
         return 0;

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