Re: [Xen-devel] [RFC v2] ARM VM System Specification

[Arnd Bergmann <arnd@xxxxxxxx>]

On Wednesday 11 June 2014 10:16:03 Paolo Bonzini wrote:
> 
> > If kernels actually do use the UEFI runtime services and have no need
> > for direct access to an RTC when runing in a UEFI compliant system, then
> > I agree with not specifying the hardware details.
> 
> The RTC is not needed for ordinary operation of the kernel and, in the 
> current kernel, the EFI RTC driver is only used for IA64.  However, it 
> seems to be platform independent.  I'll give it a shot (on x86, since 
> that's the only architecture for which I know how to get UEFI firmware).

Using the EFI RTC seems appropriate for ARM, as it's a reasonable
abstraction that should work with any hypervisor. I suspect the only
reason we don't use it on x86 is that we know which RTC hardware we
have and the kernel comes with a mandatory driver already.

        Arnd

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