x86/pat: Introduce lookup_address_in_pgd_attr()

Browse source

Add lookup_address_in_pgd_attr() doing the same as the already
existing lookup_address_in_pgd(), but returning the effective settings
of the NX and RW bits of all walked page table levels, too.

This will be needed in order to match hardware behavior when looking
for effective access rights, especially for detecting writable code
pages.

In order to avoid code duplication, let lookup_address_in_pgd() call
lookup_address_in_pgd_attr() with dummy parameters.

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20240412151258.9171-2-jgross@suse.com

...

This commit is contained in:

Juergen Gross 2024-04-12 17:12:55 +02:00 • committed by Ingo Molnar

parent 72374d71c3

commit ceb647b4b5

2 changed files with 32 additions and 3 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

2

arch/x86/include/asm/pgtable_types.h

View file

33

arch/x86/mm/pat/set_memory.c

View file