arm64: kexec: only clear EOI for SDEI in NMI context

euler inclusion
category: bugfix
Bugzilla: 12567
CVE: N/A

----------------------------------------

We need to clear EOI for the secure timer only when we panic from
sdei_handler. If we clear EOI for the secure timer in normal panic
routiue, it has no bad effect on Hi1620, but it may cause undefine
behavior on Hi1616. So add a check for NMI context before we clear EOI
for the secure timer.

Fixes: dd397d5febc4("sdei_watchdog: clear EOI of the secure timer before
kdump")
Signed-off-by: NXiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: NWei Li <liwei391@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

arch/arm64/kernel/machine_kexec.c

@@ -268,6 +268,7 @@ void machine_crash_shutdown(struct pt_regs *regs)
 	 * interrupt failed to trigger in the second kernel. So we clear eoi
 	 * of the secure timer before booting the second kernel.
 	 */
+	if (in_nmi())
 		sdei_watchdog_clear_eoi();
 
 	/* for crashing cpu */