diff options
| author | Kirill A. Shutemov <[email protected]> | 2018-05-18 14:30:28 +0300 |
|---|---|---|
| committer | Thomas Gleixner <[email protected]> | 2018-06-06 13:38:01 +0200 |
| commit | 94d49eb30e854c84d1319095b5dd0405a7da9362 (patch) | |
| tree | 0c2c2a712fae357f64de8e330c4956bda1215255 /drivers/fpga/fpga-bridge.c | |
| parent | 046c0dbec0238c25b7526c26c9a9687664229ce2 (diff) | |
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 <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Tom Lendacky <[email protected]>
Cc: [email protected]
Cc: "H. Peter Anvin" <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Diffstat (limited to 'drivers/fpga/fpga-bridge.c')
0 files changed, 0 insertions, 0 deletions