Commit 2dfa9f6a authored Dec 05, 2023 by Xiongfeng Wang

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

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8LQCC


CVE: NA

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

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: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: Wei Li <liwei391@huawei.com>
Reviewed-by: Xie XiuQi <xiexiuqi@huawei.com>

parent dab3bdb9

arch/arm64/kernel/machine_kexec.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -270,6 +270,7 @@ 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 */