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SubjectRe: [patch V149 37/50] x86/mm/64: Make a full PGD-entry size hole in the memory map
On Sat, Dec 16, 2017 at 10:24:31PM +0100, Thomas Gleixner wrote:
> From: Andy Lutomirski <luto@kernel.org>
>
> 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: Kees Cook <keescook@chromium.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Brian Gerst <brgerst@gmail.com>
> Cc: Dave Hansen <dave.hansen@intel.com>
> Cc: David Laight <David.Laight@aculab.com>
> Cc: Borislav Petkov <bp@alien8.de>
> Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
>
> ---
> Documentation/x86/x86_64/mm.txt | 4 ++--
> arch/x86/include/asm/pgtable_64_types.h | 4 ++--
> 2 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/Documentation/x86/x86_64/mm.txt b/Documentation/x86/x86_64/mm.txt
> index 63a41671d25b..6a28aeaccd53 100644
> --- a/Documentation/x86/x86_64/mm.txt
> +++ b/Documentation/x86/x86_64/mm.txt
> @@ -28,8 +28,8 @@ Virtual memory map with 5 level page tables:
> hole caused by [56:63] sign extension
> ff00000000000000 - ff0fffffffffffff (=52 bits) guard hole, reserved for hypervisor
> ff10000000000000 - ff8fffffffffffff (=55 bits) direct mapping of all phys. memory
> -ff90000000000000 - ff91ffffffffffff (=49 bits) hole
> -ff92000000000000 - ffd1ffffffffffff (=54 bits) vmalloc/ioremap space
> +ff90000000000000 - ff9fffffffffffff (=52 bits) hole
> +ffa0000000000000 - ffd1ffffffffffff (=54 bits) vmalloc/ioremap space

+ffa0000000000000 - ffd1ffffffffffff (=12800 TB) vmalloc/ioremap space

--
Kirill A. Shutemov

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