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[Xen-ia64-devel] [PATCH] Fix a bug in INIT handler

from [Masaki Kanno]

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Subject:	[Xen-ia64-devel] [PATCH] Fix a bug in INIT handler
From:	Masaki Kanno <kanno.masaki@xxxxxxxxxxxxxx>
Date:	Tue, 31 Oct 2006 11:44:15 +0900
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Hi,

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. (e.g.: attached 
file "INIT_handler_fault_messages.txt")

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>

Best regards,
 Kan

INIT_handler_fault_messages.txt
Description: Text document

minstate.patch
Description: Binary data

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