On 2016/1/18 23:07, Stefano Stabellini wrote:
> On Mon, 18 Jan 2016, Mark Rutland wrote:
>> > On Fri, Jan 15, 2016 at 02:55:24PM +0800, 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>
>>> > > ---
>>> > > 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;
>>> > > }
>> >
>> > As this is changing the semantic of an "empty" DT, we should consider
>> > now if there's anything else that might also need to exist in an "empty"
>> > DT. We don't want to change this again in future if we don't have to,
>> > given the compatiblity nightmare that's sure to result.
>> >
>> > We should also consider if the "hypervisor" node name is sufficient (I
>> > think it is, but let's not assume anything).
>>From Xen point of view I think it is enough: real hardware is described
> in ACPI anyway and anything hypervisor related can be done via
> hypercalls once Xen support is discovered, for which the hypervisor node
> is sufficient.
Yes, I think the hypervisor node is sufficient for current Xen ACPI support.
--
Shannon
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