Re: [Xen-devel] ARM64 EFI runtime

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

Hi Brijesh,

passing EFI tables to dom0 is still under work by Shannon, see:
http://marc.info/?l=xen-devel&m=144321258920213. For now you could
simply reuse the existing linux uefi device tree nodes, see
Documentation/arm/uefi.txt and the existing acpi patch series for Xen,
which also introduces passing efi tables to dom0:
http://marc.info/?l=xen-devel&m=143189314630953.

Once dom0 knows about efi, then it is just a matter of enabling the
existing PV runtime services on arm64, see drivers/xen/efi.c.


On Tue, 13 Oct 2015, Brijesh Singh wrote:
> Thanks for update Stefano,
> 
> If you have some sample code on private git then please point me at it. I 
> should be able to help on both development and testing on Seattle  platform. 
> 
> -Brijesh
> 
> On 10/13/2015 04:57 AM, Stefano Stabellini wrote:
> > Hi Brijesh,
> > 
> > EFI runtime services are not currently exported to Dom0. They are still
> > a work in progress.
> > 
> > Regards,
> > 
> > Stefano
> > 
> > On Mon, 12 Oct 2015, Brijesh Singh wrote:
> >> Hi All,
> >>
> >> I noticed that DOM0 kernel fails to get time via RTC device on AMD ARM64 
> >> (Seattle) platform. On this platform Linux uses rtc-efi driver to get the 
> >> time through EFI runtime services, and I know for sure that driver works 
> >> well outside the Xen environment. It seems that devicetree passed to DOM0 
> >> through Xen does not contain UEFI system table information hence DOM0 
> >> fails to probe rtc-efi platform driver. I see the below message in DOM0 
> >> dmesg log
> >>
> >> [    0.000000] bootconsole [uart0] enabled
> >> [    0.000000] efi: Getting EFI parameters from FDT:
> >> [    0.000000] efi: UEFI not found.
> >> [    0.000000] cma: Reserved 16 MiB at 0x00000083df000000
> >>
> >>
> >> Looking at Xen's common/efi/runtime.c indicates that EFI runtime services 
> >> are not yet supported on ARM platform, is anyone working on it? 
> >>
> >> Thanks
> >> Brijesh
> >>
> >> _______________________________________________
> >> Xen-devel mailing list
> >> Xen-devel@xxxxxxxxxxxxx
> >> http://lists.xen.org/xen-devel
> >>
> 

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