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From: Adrian Chadd <adrian@FreeBSD.org>
Date: Sat, 30 May 2009 08:53:13 +0000 (UTC)
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Subject: svn commit: r193085 - head/sys/xen/evtchn
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Author: adrian
Date: Sat May 30 08:53:13 2009
New Revision: 193085
URL: http://svn.freebsd.org/changeset/base/193085

Log:
  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

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.
+ */
 void
 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];
 	
         notify_remote_via_irq(irq); 
 }