[Xen-devel] [PATCH 3/8] xen/arm: acpi: Don't fallback on DT when user request ACPI

[Julien Grall <julien.grall@xxxxxxx>]

On ARM, when the user put 'acpi=force' Xen will use ACPI over DT.
Currently, if Xen fails to initialize ACPI it will fallback on DT.

This behavior makes difficult for a user to notice Xen didn't used ACPI
has requested on platform where the firmware is providing both ACPI and DT.

Rather than fallback on DT during a failure, panic when 'acpi=force'.

Signed-off-by: Julien Grall <julien.grall@xxxxxxx>

---
    I am wondering if we should do the same with acpi=on. So a user
    would notice directly if something went wrong with ACPI.
    Otherwise you would boot up to the prompt and barely notice that DT
    was used.
---
 xen/arch/arm/acpi/boot.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/xen/arch/arm/acpi/boot.c b/xen/arch/arm/acpi/boot.c
index 889208a..65ef632 100644
--- a/xen/arch/arm/acpi/boot.c
+++ b/xen/arch/arm/acpi/boot.c
@@ -272,6 +272,11 @@ int __init acpi_boot_table_init(void)
     return 0;
 
 disable:
+
+    /* Panic if the user has requested ACPI but Xen is able to initialize. */
+    if ( param_acpi_force )
+        panic("Unable to use ACPI");
+
     disable_acpi();
 
     return error;
-- 
1.9.1


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