[RFC PATCH] arm64/efi: use stable virtual mappings for UEFI runtime services

[Geoff Levand]

Hi Ard,

On Tue, 2014-10-14 at 12:26 +0200, Ard Biesheuvel wrote:
> On 14 October 2014 04:17, Dave Young <dyoung at redhat.com> wrote:
> > On 10/13/14 at 03:52pm, Geoff Levand wrote:
> >> early_memremap() returns 0xFFFFFFBFFBCBF618, and the dereference
> >> starts the crash.  I did not look into it further.
> >
> > This is an expected behaviour as I mentioned before, we need save fw_vendor
> > and the other two physical addresses and pass them to 2nd kernel.
> >
> > UEFI firmware will convert them to virtual address after entering virtual mode.
> >
> 
>  Yes, you did point that out before, and I haven't addressed it in my patch.
> 
> But allow me to emphasize *again* that these issues will simply cease
> to exist if we decide to not use SetVirtualAddressMap() at all, and
> call the UEFI Runtime Services through their physical mappings.

Once you figure out what you will do, and you think you have a complete
working solution, let me know and I will test them.  I don't plan to do
any more UEFI testing until then.

-Geoff