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[PATCH v2 4/4] xen/arm: mpu: Implement a dummy enable_secondary_cpu_mm


  • To: <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
  • Date: Wed, 18 Sep 2024 18:51:02 +0100
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  • Cc: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, "Bertrand Marquis" <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
  • Delivery-date: Wed, 18 Sep 2024 17:53:16 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

Secondary cpus initialization is not yet supported. Thus, we print an
appropriate message and put the secondary cpus in WFE state.

Signed-off-by: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
---
Changes from :-

v1 - 1. NR_CPUS is defined as 1 for MPU

2. Added a message in enable_secondary_cpu_mm()

 xen/arch/Kconfig              |  1 +
 xen/arch/arm/arm64/mpu/head.S | 10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/xen/arch/Kconfig b/xen/arch/Kconfig
index 308ce129a8..8640b7ec8b 100644
--- a/xen/arch/Kconfig
+++ b/xen/arch/Kconfig
@@ -11,6 +11,7 @@ config NR_CPUS
        default "8" if ARM && RCAR3
        default "4" if ARM && QEMU
        default "4" if ARM && MPSOC
+       default "1" if ARM && MPU
        default "128" if ARM
        help
          Controls the build-time size of various arrays and bitmaps
diff --git a/xen/arch/arm/arm64/mpu/head.S b/xen/arch/arm/arm64/mpu/head.S
index ef55c8765c..3dfbbf8879 100644
--- a/xen/arch/arm/arm64/mpu/head.S
+++ b/xen/arch/arm/arm64/mpu/head.S
@@ -168,6 +168,16 @@ FUNC(enable_boot_cpu_mm)
     b   1b
 END(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:  PRINT("- SMP not enabled yet -\r\n")
+    wfe
+    b 1b
+ENDPROC(enable_secondary_cpu_mm)
+
 /*
  * Local variables:
  * mode: ASM
-- 
2.25.1




 


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