On 2016/1/27 16:27, Hanjun Guo wrote:
> Hi Shannon,
>
> On 2016/1/23 11:19, Shannon Zhao wrote:
>> 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>
>> ---
>> 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.
>
> The comment is bit misleading, we need to specify two mode, running on
> Xen or not, if not on xen, then /chosen node is enough.
>
Ok, will rephrase it.
>> */
>> - 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 here too.
>
> if that is addressed,
>
> Acked-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
Thanks!
--
Shannon
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