Re: [Xen-devel] [PATCH 2/2] efi/boot: Don't free ebmalloc area at all

[Daniel Kiper <daniel.kiper@xxxxxxxxxx>]

On Wed, Mar 01, 2017 at 01:02:55AM -0700, Jan Beulich wrote:
> >>> On 28.02.17 at 20:09, <andrew.cooper3@xxxxxxxxxx> wrote:
> > On 28/02/17 19:01, Daniel Kiper wrote:
> >> Looking at this I do not have a better idea for fix off the top of my head.
>
> Well, one better solution was already suggested: Put it in .init.data and

This will increase Xen binary size. So, I prefer to leave it in BSS if possible.

> suppress the freeing of the used part of it. The other option is to put
> a section along the lines of Linux'es .brk _after_ .bss (whether ahead
> of or after _end would need to be seen), replacing the uses of
> __2M_rwdata_end by a runtime calculated value (and freeing space
> past the used portion accordingly, without shattering large pages if
> used).

OK, make sense for me. However, from a bootloader point of view it should be
still part of BSS. Otherwise, the bootloader can put the end of Xen image too
close to reserved/no ram/etc. region. This does not seem important right now
but after applying the rest of my patch series it can make a pain.

Daniel

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