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SubjectRe: [GIT PULL] x86/urgent for v5.13-rc5
On Sun, Jun 06, 2021 at 02:23:21PM -0700, Linus Torvalds wrote:
> On Sun, Jun 6, 2021 at 1:58 PM Mike Rapoport <rppt@linux.ibm.com> wrote:
> >
> > A while ago hpa said:
> >
> > As far as I know, Windows 7 actually reserves all memory below
> > 1 MiB to avoid BIOS bugs.
> >
> > (https://bugzilla.kernel.org/show_bug.cgi?id=16661#c2)
>
> It would be good to have that checked somehow.
>
> I don't think this matters on any machine with gigs of RAM, but I do
> wonder about the people who want to do small configurations. Maybe
> they've given up on x86?
>
> It also eats into that somewhat precious legacy DMA resource and eats
> up a fair chunk of that. Again, not an issue on modern hardware, but
> ..
>
> > I believe that reserving everything below 1M after the real mode trampoline
> > is allocated reduces amount of hidden dependencies and makes things simpler
> > overall.
>
> Simpler, perhaps, and _I_ personally don't care about about 512kB of
> memory any more on any machines I have, but ..

Let's see if Sasha can dig out something... CCed.

@Sasha, can you figure out who we can talk to whether Windoze reserves
the first megabyte of memory unconditionally?

Thx.

--
Regards/Gruss,
Boris.

https://people.kernel.org/tglx/notes-about-netiquette

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