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[PATCH 08/19] xen/arm: Add rcu_barrier() before enabling non-boot CPUs on resume
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Mykyta Poturai <Mykyta_Poturai@xxxxxxxx>
- Date: Fri, 7 Oct 2022 10:32:48 +0000
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- Cc: Mirela Simonovic <mirela.simonovic@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Saeed Nowshadi <saeed.nowshadi@xxxxxxxxxx>
- Delivery-date: Fri, 07 Oct 2022 10:33:05 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHY2jglpD72HLvPXkazM/pUUGVcBQ==
- Thread-topic: [PATCH 08/19] xen/arm: Add rcu_barrier() before enabling non-boot CPUs on resume
From: Mirela Simonovic <mirela.simonovic@xxxxxxxxxx>
The rcu_barrier() has to be added to ensure that the per cpu area is
freed before a non-boot CPU tries to initialize it (_free_percpu_area()
has to be called before the init_percpu_area()). This scenario occurs
when non-boot CPUs are hot-unplugged on suspend and hotplugged on resume.
Signed-off-by: Mirela Simonovic <mirela.simonovic@xxxxxxxxxx>
Signed-off-by: Saeed Nowshadi <saeed.nowshadi@xxxxxxxxxx>
---
xen/arch/arm/suspend.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/xen/arch/arm/suspend.c b/xen/arch/arm/suspend.c
index 0784979e4f..0c16cfc750 100644
--- a/xen/arch/arm/suspend.c
+++ b/xen/arch/arm/suspend.c
@@ -153,6 +153,7 @@ static long system_suspend(void *data)
system_state = SYS_STATE_resume;
resume_nonboot_cpus:
+ rcu_barrier();
enable_nonboot_cpus();
thaw_domains();
system_state = SYS_STATE_active;
--
2.37.1
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