From 669b0ae961e87c824233475e987b2d39996d4849 Mon Sep 17 00:00:00 2001 From: Vaughan Cao Date: Fri, 16 Aug 2013 16:10:56 +0800 Subject: [PATCH] xen/pvhvm: Initialize xen panic handler for PVHVM guests 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 becomes aware of 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 PV, this patch is necessary for PVHVM. Without this patch, setting 'on_crash=coredump-restart' in PVHVM guest config file won't lead a vmcore to be generate when the guest panics. It can be reproduced with 'echo c > /proc/sysrq-trigger'. Signed-off-by: Vaughan Cao Signed-off-by: Konrad Rzeszutek Wilk Acked-by: Joe Jin --- 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 b5a22fa..15939e8 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(); -- 2.7.4