Re: [PATCH] x86-64: use EFI to deal with platform wall clock

[Matthew Garrett]

On Tue, May 15, 2012 at 02:19:07PM +0100, Jan Beulich wrote:

> I would have expected that things work that way, but they
> don't. In particular is the function in efi_64.c that's being
> modified here called from efi_call_phys_{pro,epi}log(), and at
> that point we can't expect virtual addresses to be uniformly
> set yet. So it's a physical call that requires the fixup done
> here, as efi_set_executable() simply expects ->virt_addr to
> be valid. I suspect that no physical calls other than
> phys_efi_set_virtual_address_map() were being done so far
> at all on 64-bit, hiding the problem.

In that case we need to split the mapping code into two chunks and 
configure the memory map earlier. You can't depend on __va() doing 
anything useful on runtime addresses.

-- 
Matthew Garrett | mjg59@xxxxxxxxxxxxx
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/