Re: [Xen-devel] [PATCH] x86/time: Don't use EFI's GetTime call by default

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 08.12.15 at 12:02, <ian.campbell@xxxxxxxxxx> wrote:
> On Wed, 2015-12-02 at 02:33 -0700, Jan Beulich wrote:
>> Then we should see about adding support for "efi=no-time".
> 
> And based on what I'm reading in this thread about the reliability of the
> time RS in the field it seems to me we should make it the default (on x86
> at least) and provide efi=time to opt in.

Which would get us to actively violate at least early versions of the
spec (the current one doesn't appear to be as strict anymore). I'm
fine making it easy to work around the issue, but I'm against us doing
the wrong thing by default.

Apart from that, Ross, the patch you provided breaks on systems
without CMOS clock (e.g. so called legacy free ones). This definitely
can't be a compile time thing.

Jan


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