[Xen-devel] [PATCH v4 12/17] ARM64: ACPI: Check if it runs on Xen to enable or disable ACPI

[Shannon Zhao <zhaoshenglong@xxxxxxxxxx>]

From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

When it's a Xen domain0 booting with ACPI, it will supply a /chosen and
a /hypervisor node in DT. So check if it needs to enable ACPI.

Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Acked-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
---
CC: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
---
 arch/arm64/kernel/acpi.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
index d1ce8e2..4e92be0 100644
--- a/arch/arm64/kernel/acpi.c
+++ b/arch/arm64/kernel/acpi.c
@@ -67,10 +67,13 @@ static int __init dt_scan_depth1_nodes(unsigned long node,
 {
        /*
         * Return 1 as soon as we encounter a node at depth 1 that is
-        * not the /chosen node.
+        * not the /chosen node, or /hypervisor node when running on Xen.
         */
-       if (depth == 1 && (strcmp(uname, "chosen") != 0))
-               return 1;
+       if (depth == 1 && (strcmp(uname, "chosen") != 0)) {
+               if (!xen_initial_domain() || (strcmp(uname, "hypervisor") != 0))
+                       return 1;
+       }
+
        return 0;
 }
 
@@ -184,7 +187,8 @@ void __init acpi_boot_table_init(void)
        /*
         * Enable ACPI instead of device tree unless
         * - ACPI has been disabled explicitly (acpi=off), or
-        * - the device tree is not empty (it has more than just a /chosen node)
+        * - the device tree is not empty (it has more than just a /chosen node,
+        *   and a /hypervisor node when running on Xen)
         *   and ACPI has not been force enabled (acpi=force)
         */
        if (param_acpi_off ||
-- 
2.0.4



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