[xen staging] xen/arm: Check if the platform is not using ACPI before initializing Dom0less

[patchbot@xxxxxxx]

commit dac867bf9adc1562a4cf9db5f89726597af13ef8
Author:     Julien Grall <jgrall@xxxxxxxxxx>
AuthorDate: Sat Sep 26 21:16:55 2020 +0100
Commit:     Julien Grall <jgrall@xxxxxxxxxx>
CommitDate: Fri Oct 30 18:43:42 2020 +0000

    xen/arm: Check if the platform is not using ACPI before initializing 
Dom0less
    
    Dom0less requires a device-tree. However, since commit 6e3e77120378
    "xen/arm: setup: Relocate the Device-Tree later on in the boot", the
    device-tree will not get unflatten when using ACPI.
    
    This will lead to a crash during boot.
    
    Given the complexity to setup dom0less with ACPI (for instance how to
    assign device?), we should skip any code related to Dom0less when using
    ACPI.
    
    Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
    Tested-by: Rahul Singh <rahul.singh@xxxxxxx>
    Reviewed-by: Rahul Singh <rahul.singh@xxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
    Tested-by: Elliott Mitchell <ehem+xen@xxxxxxx>
---
 xen/arch/arm/setup.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index f16b33fa87..35e5bee04e 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -987,7 +987,8 @@ void __init start_xen(unsigned long boot_phys_offset,
 
     system_state = SYS_STATE_active;
 
-    create_domUs();
+    if ( acpi_disabled )
+        create_domUs();
 
     domain_unpause_by_systemcontroller(dom0);
 
--
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