[Xen-changelog] [xen-unstable] [IA64] Fix a bug in INIT handler

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

# HG changeset patch
# User awilliam@xxxxxxxxxxx
# Node ID 77bf1d1628a77bd9a207aeb99d2cbb400671a109
# Parent  37a8dbe24201b0e81e89d652aabf3f8f1952bfeb
[IA64] Fix a bug in INIT handler

I found a bug in INIT handler.  This bug sometimes occurs on
the following conditions.
 1. Create a domVTi
 2. Run a user program on domVTi
 3. Push to INIT switch

When this bug occurs, Xen shows error messages.

This bug occurs if a vCPU of domVTi runs on a pCPU where its
INIT interruption have not occurred yet.  It is because
"arch._thread.on_ustack" member in vcpu structure is always
zero and, accordingly, ar.bspstore doesn't switch to Xen RBS
in the MINSTATE_START_SAVE_MIN_PHYS.

This patch adds a checking of ipsr.vm bit into the
MINSTATE_START_SAVE_MIN_PHYS for domVTi.  If ipsr.vm bit is 1,
ar.bspstore is switched to Xen RBS.

Signed-off-by: Masaki Kanno <kanno.masaki@xxxxxxxxxxxxxx>
---
 xen/arch/ia64/linux-xen/minstate.h |    2 ++
 1 files changed, 2 insertions(+)

diff -r 37a8dbe24201 -r 77bf1d1628a7 xen/arch/ia64/linux-xen/minstate.h
--- a/xen/arch/ia64/linux-xen/minstate.h        Tue Oct 31 22:25:17 2006 -0700
+++ b/xen/arch/ia64/linux-xen/minstate.h        Tue Oct 31 22:25:21 2006 -0700
@@ -38,6 +38,8 @@
  */
 #ifdef XEN
 # define MINSTATE_START_SAVE_MIN_PHYS                                          
                \
+(pKStk)        tbit.z pKStk,pUStk=r29,IA64_PSR_VM_BIT;                         
                        \
+       ;;                                                                      
                \
 (pKStk)        movl r3=THIS_CPU(ia64_mca_data);;                               
                        \
 (pKStk)        tpa r3 = r3;;                                                   
                        \
 (pKStk)        ld8 r3 = [r3];;                                                 
                        \

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