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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> 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?

Jan


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