On Thu, Aug 6, 2020 at 11:57 AM Joerg Roedel <jroe...@suse.de> wrote:
>
> On Thu, Aug 06, 2020 at 03:10:34PM +0200, Ingo Molnar wrote:
> >
> > * Linus Torvalds <torva...@linux-foundation.org> wrote:
> > > So apparently the "the page-table pages are all pre-allocated now" is
> > > simply not true. Joerg?
>
> It pre-allocates the whole vmalloc/ioremap PUD/P4D pages, but I actually
> only tested it with 4-level paging, as I don't have access to 5-level
> paging hardware.
I don't think Jason has either.
The
PGD 0 P4D 0
line tells us that "pgd_present()" is true, even though PGD is 0
(otherwise it wouldn't print the P4D part). That means that he doesn't
have l5 enabled.
But you may obviously have different settings for CONFIG_X86_5LEVEL,
and maybe that ends up changing something?
But since apparently it's not immediately obvious what the problem is,
I'll revert it for now.
Linus
