Re: [Xen-devel] [PATCH v16 5/9] x86: change default load address from 1 MiB to 2 MiB

[Daniel Kiper <daniel.kiper@xxxxxxxxxx>]

On Wed, Mar 01, 2017 at 03:34:47AM -0700, Jan Beulich wrote:
> >>> On 01.03.17 at 11:13, <daniel.kiper@xxxxxxxxxx> wrote:
> > On Wed, Mar 01, 2017 at 02:05:39AM -0700, Jan Beulich wrote:
> >> >>> On 21.02.17 at 20:19, <daniel.kiper@xxxxxxxxxx> wrote:
> >> > Subsequent patches introducing relocatable early boot code play with
> >> > page tables using 2 MiB huge pages. If load address is not aligned at
> >> > 2 MiB then code touching such page tables must have special cases for
> >> > start and end of Xen image memory region. So, let's make life easier
> >> > and move default load address from 1 MiB to 2 MiB. This way page table
> >> > code will be nice and easy. Hence, there is a chance that it will be
> >> > less error prone too... :-)))
> >> >
> >> > Additionally, drop first 2 MiB mapping from Xen image mapping.
> >> > It is no longer needed.
> >>
> >> What about the memory allocated for it? Aiui at least in the xen.efi
> >> case there would be a 2Mb chunk left unused, but also never freed.
> >
> > Memory is not allocated for it.
>
> Are you sure? Where would the PE32+ header live in that case?

Is the PE32+ header loaded into memory? I think that only code and data stuff
is put there. Header is useful only for loader. Am I missing something?

Daniel

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