Re: [Xen-devel] [PATCH] x86: Don't honour ACPI indicating absence of CMOS RTC

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 17.06.14 at 19:01, <andrew.cooper3@xxxxxxxxxx> wrote:
> On 17/06/14 16:12, Jan Beulich wrote:
>> - code probing for a functional CMOS RTC gating the panic()
>>   invocation.
> 
> If the firmware claims no RTC, is it even safe to probe?  There is
> nothing I am aware of preventing the IO port space being reused by
> something else if the firmware has told the OS that there genuinely
> isn't an RTC there.

If you assume it is safe to use the RTC, how can you suggest it to be
unsafe to probe it? Furthermore, any such probing should of course
come with a way to suppress it.

As a side note - just now HP reported this problem of theirs against
SLE12 too.

Jan


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