From: Julien Grall <jgrall@amazon.com>
Date: Sat, 26 Sep 2020 20:16:55 +0000 (+0100)
Subject: xen/arm: Check if the platform is not using ACPI before initializing Dom0less
X-Git-Tag: archive/raspbian/4.16.0+51-g0941d6cb-1+rpi1~2^2~42^2~1439
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=dac867bf9adc1562a4cf9db5f89726597af13ef8;p=xen.git

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@amazon.com>
Tested-by: Rahul Singh <rahul.singh@arm.com>
Reviewed-by: Rahul Singh <rahul.singh@arm.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Tested-by: Elliott Mitchell <ehem+xen@m5p.com>
---

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);