[PATCH 2/2] Allow kdump with crash_kexec_post_notifiers

From: Petr Tesarik <ptesarik@suse.com>
To: Juergen Gross <jgross@suse.com>,
	Josh Triplett <josh@joshtriplett.org>,
	Ingo Molnar <mingo@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Eric Biederman <ebiederm@xmission.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Dave Young <dyoung@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	David Vrabel <david.vrabel@citrix.com>
Cc: "moderated list:XEN HYPERVISOR INTERFACE"
	<xen-devel@lists.xenproject.org>,
	"maintainer:X86 ARCHITECTURE 32-BIT AND 64-BIT" <x86@kernel.org>,
	"open list:KEXEC" <kexec@lists.infradead.org>,
	open list <linux-kernel@vger.kernel.org>
Subject: [PATCH 2/2] Allow kdump with crash_kexec_post_notifiers
Date: Wed, 13 Jul 2016 14:20:00 +0200	[thread overview]
Message-ID: <20160713122000.14969.99963.stgit__33587.7938814976$1468412581$gmane$org@hananiah.suse.cz> (raw)
In-Reply-To: <20160713121950.14969.78606.stgit@hananiah.suse.cz>

If a crash kernel is loaded, do not crash the running domain. This is
needed if the kernel is loaded with crash_kexec_post_notifiers, because
panic notifiers are run before __crash_kexec() in that case, and this
Xen hook prevents its being called later.

Signed-off-by: Petr Tesarik <ptesarik@suse.com>
---
 arch/x86/xen/enlighten.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 760789a..6e3e7c6 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1325,7 +1325,8 @@ static void xen_crash_shutdown(struct pt_regs *regs)
 static int
 xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
 {
-	xen_reboot(SHUTDOWN_crash);
+	if (!kexec_crash_loaded())
+		xen_reboot(SHUTDOWN_crash);
 	return NOTIFY_DONE;
 }
 


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