x86/mm/64: Make a full PGD-entry size hole in the memory map
authorAndy Lutomirski <luto@kernel.org>
Tue, 12 Dec 2017 15:56:44 +0000 (07:56 -0800)
committerIngo Molnar <mingo@kernel.org>
Sat, 23 Dec 2017 20:13:00 +0000 (21:13 +0100)
commit9f449772a3106bcdd4eb8fdeb281147b0e99fb30
tree42d799c62d5414452f2d9b1581cc01d3dbb9553c
parentc1961a4631daef4aeabee8e368b1b13e8f173c91
x86/mm/64: Make a full PGD-entry size hole in the memory map

Shrink vmalloc space from 16384TiB to 12800TiB to enlarge the hole starting
at 0xff90000000000000 to be a full PGD entry.

A subsequent patch will use this hole for the pagetable isolation LDT
alias.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Laight <David.Laight@aculab.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Documentation/x86/x86_64/mm.txt
arch/x86/include/asm/pgtable_64_types.h