linux-kernel - [PATCH] xen: initialize xen panic handler for PVHVM

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Date:	Fri, 16 Aug 2013 16:10:56 +0800
From:	Vaughan Cao <vaughan.cao@...cle.com>
To:	konrad.wilk@...cle.com, jeremy@...p.org, tglx@...utronix.de,
	mingo@...hat.com, hpa@...or.com, x86@...nel.org,
	xen-devel@...ts.xensource.com,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Cc:	vaughan.cao@...cle.com
Subject: [PATCH] xen: initialize xen panic handler for PVHVM

kernel use callback linked in panic_notifier_list to notice others when panic
happens.
NORET_TYPE void panic(const char * fmt, ...){
    ...
    atomic_notifier_call_chain(&panic_notifier_list, 0, buf);
}
When xen aware this, it will call xen_reboot(SHUTDOWN_crash) to send out an
event with reason code - SHUTDOWN_crash.
xen_panic_handler_init() is defined to register on panic_notifier_list but
we only call it in xen_arch_setup which only be called by pvm, this patch is
 necessary for pvhvm.

Signed-off-by: Vaughan Cao <vaughan.cao@...cle.com>
---
 arch/x86/xen/enlighten.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 4aec5ed..53e5726 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1713,6 +1713,8 @@ static void __init xen_hvm_guest_init(void)
 
 	xen_hvm_init_shared_info();
 
+	xen_panic_handler_init();
+
 	if (xen_feature(XENFEAT_hvm_callback_vector))
 		xen_have_vector_callback = 1;
 	xen_hvm_smp_init();
-- 
1.7.11.7

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