[Xen-changelog] [xen-unstable] [XEN][POWERPC] Flush the ERAT very early on secondary processors.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Jimi Xenidis <jimix@xxxxxxxxxxxxxx>
# Node ID da882f0212d6e47824238cd791447a09f927e1ee
# Parent  4d47f058fffd00cbe50bdec11c8fa362bd4d3cf6
[XEN][POWERPC] Flush the ERAT very early on secondary processors.
This patch solves the problem with the "Synchronizing timebase hang"
that both SMP and "nosmp" users have experienced.  It blows away the
ERAT but performing an SLBIA in the seconadry processor "spinup" code.
Signed-off-by: Amos Waterland <apw@xxxxxxxxxx>
Signed-off-by: Jimi Xenidis <jimix@xxxxxxxxxxxxxx>
Signed-off-by: Hollis Blanchard <hollisb@xxxxxxxxxx>
---
 xen/arch/powerpc/powerpc64/exceptions.S |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletion(-)

diff -r 4d47f058fffd -r da882f0212d6 xen/arch/powerpc/powerpc64/exceptions.S
--- a/xen/arch/powerpc/powerpc64/exceptions.S   Sat Nov 11 10:30:07 2006 -0500
+++ b/xen/arch/powerpc/powerpc64/exceptions.S   Sat Nov 11 12:04:45 2006 -0500
@@ -564,7 +564,11 @@ _GLOBAL(sleep)
  */    
     .globl spin_start
 spin_start:
-
+    /* We discovered by experiment that the ERAT must be flushed early.  */
+    isync
+    slbia
+    isync
+       
     /* Do a cache flush for our text, in case the loader didn't */
     LOADADDR(r9, _start)
     LOADADDR(r8, _etext)

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