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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2018-05-18 14:30:28 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-06-06 14:38:01 +0300 |
| commit | 94d49eb30e854c84d1319095b5dd0405a7da9362 (patch) | |
| tree | 0c2c2a712fae357f64de8e330c4956bda1215255 /fs/ubifs/super.c | |
| parent | 046c0dbec0238c25b7526c26c9a9687664229ce2 (diff) | |
| download | linux-94d49eb30e854c84d1319095b5dd0405a7da9362.tar.xz | |
x86/mm: Decouple dynamic __PHYSICAL_MASK from AMD SME
AMD SME claims one bit from physical address to indicate whether the
page is encrypted or not. To achieve that we clear out the bit from
__PHYSICAL_MASK.
The capability to adjust __PHYSICAL_MASK is required beyond AMD SME.
For instance for upcoming Intel Multi-Key Total Memory Encryption.
Factor it out into a separate feature with own Kconfig handle.
It also helps with overhead of AMD SME. It saves more than 3k in .text
on defconfig + AMD_MEM_ENCRYPT:
add/remove: 3/2 grow/shrink: 5/110 up/down: 189/-3753 (-3564)
We would need to return to this once we have infrastructure to patch
constants in code. That's good candidate for it.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Cc: linux-mm@kvack.org
Cc: "H. Peter Anvin" <hpa@zytor.com>
Link: https://lkml.kernel.org/r/20180518113028.79825-1-kirill.shutemov@linux.intel.com
Diffstat (limited to 'fs/ubifs/super.c')
0 files changed, 0 insertions, 0 deletions