diff options
| author | Ard Biesheuvel <ardb@kernel.org> | 2024-02-27 18:19:11 +0300 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-03-04 20:12:16 +0300 |
| commit | d6a41f184dcea0814260af2780e147022c11dca8 (patch) | |
| tree | 9e031b5b8a82e03dc1a071cf138a3e8ba5e14c3c /include/linux/fpga/fpga-mgr.h | |
| parent | 63bed96604205fa0b23c91d268df5f1f1b26faf6 (diff) | |
| download | linux-d6a41f184dcea0814260af2780e147022c11dca8.tar.xz | |
x86/startup_64: Simplify calculation of initial page table address
Determining the address of the initial page table to program into CR3
involves:
- taking the physical address
- adding the SME encryption mask
On the primary entry path, the code is mapped using a 1:1 virtual to
physical translation, so the physical address can be taken directly
using a RIP-relative LEA instruction.
On the secondary entry path, the address can be obtained by taking the
offset from the virtual kernel base (__START_kernel_map) and adding the
physical kernel base.
This is implemented in a slightly confusing way, so clean this up.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
Link: https://lore.kernel.org/r/20240227151907.387873-14-ardb+git@google.com
Diffstat (limited to 'include/linux/fpga/fpga-mgr.h')
0 files changed, 0 insertions, 0 deletions