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[PATCH v1 4/4] xen/arm: mpu: Disable secondary cpu bringup
- To: <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
- Date: Fri, 23 Aug 2024 17:31:27 +0100
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- Cc: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, "Volodymyr Babchuk" <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Fri, 23 Aug 2024 16:32:06 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Secondary cpus are put in WFE state. We do not support SMP at this time.
Signed-off-by: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
---
xen/arch/arm/arm64/mpu/head.S | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/xen/arch/arm/arm64/mpu/head.S b/xen/arch/arm/arm64/mpu/head.S
index 2b023c346a..1579ac0408 100644
--- a/xen/arch/arm/arm64/mpu/head.S
+++ b/xen/arch/arm/arm64/mpu/head.S
@@ -68,3 +68,12 @@ ENTRY(enable_boot_cpu_mm)
ret
ENDPROC(enable_boot_cpu_mm)
+
+/*
+ * Secondary cpu has not yet been supported on MPU systems. We will block the
+ * secondary cpu bringup at this stage.
+ */
+ENTRY(enable_secondary_cpu_mm)
+1: wfe
+ b 1b
+ENDPROC(enable_secondary_cpu_mm)
--
2.25.1
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