On Mon, May 19, 2014 at 02:30:45PM +0100, Jan Beulich wrote:
> >>> On 16.05.14 at 22:41, <daniel.kiper@xxxxxxxxxx> wrote:
> > @@ -457,6 +460,21 @@ void __init efi_free_boot_services(void)
> > efi_unmap_memmap();
> > }
> >
> > +static void __init __iomem *efi_early_ioremap(resource_size_t phys_addr,
> > + unsigned long size)
> > +{
> > + if (efi_enabled(EFI_DIRECT))
> > + return early_ioremap(phys_addr, size);
> > +
> > + return (__force void __iomem *)phys_addr;
>
> Now that surely needs some explanation: I can't see how this can
> ever be correct, Xen or not being completely irrelevant.
I hope that efi_enabled(EFI_DIRECT) is obvious. However, in case of
!efi_enabled(EFI_DIRECT) some structures are created artificially
and they live in virtual address space. So that is why they should
not be mapped. If you wish I could add relevant comment here.
Daniel
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