svn commit: r193085 - head/sys/xen/evtchn

Adrian Chadd adrian at
Sat May 30 08:53:14 UTC 2009

Author: adrian
Date: Sat May 30 08:53:13 2009
New Revision: 193085

  Make ipi_cpu() function as intended.
  IPI's in Xen are implemented through hypervisor event channels.
  The MP code creates a pair of IRQs for each base IPI per CPU
  (one for IPI function dispatch calls, one for IPI bitmap dispatch calls.)
  Using PCPU_GET() was returning the IRQ of the IPI handler for the
  current CPU; thus calls to ipi_cpu() were sending itself a message.
  Instead, looking up the IPI in the target CPU ipi-to-irq map is needed.
  Note: This doesn't fix Xen SMP (far from it!) but it at least
  sends IPI's to the right places. Next - sending IPIs..
  PR:	135069


Modified: head/sys/xen/evtchn/evtchn.c
--- head/sys/xen/evtchn/evtchn.c	Sat May 30 07:33:32 2009	(r193084)
+++ head/sys/xen/evtchn/evtchn.c	Sat May 30 08:53:13 2009	(r193085)
@@ -225,12 +225,15 @@ evtchn_do_upcall(struct trapframe *frame
+ * Send an IPI from the current CPU to the destination CPU.
+ */
 ipi_pcpu(unsigned int cpu, int vector) 
         int irq;
-	irq = PCPU_GET(ipi_to_irq[vector]);
+	irq = pcpu_find(cpu)->pc_ipi_to_irq[vector];

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