diff options
| author | H. Peter Anvin (Intel) <hpa@zytor.com> | 2023-01-11 23:20:32 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2023-01-13 10:07:27 +0100 |
| commit | 92cbbadf73f45c5d8bb26ed8668ff59671ff21e6 (patch) | |
| tree | af1ce62216d2f0aa7051471fa8704f14a4288b06 /include/linux/fpga/fpga-mgr.h | |
| parent | ae53fa18703000f507107df43efd1168a0365361 (diff) | |
x86/gsseg: Use the LKGS instruction if available for load_gs_index()
The LKGS instruction atomically loads a segment descriptor into the
%gs descriptor registers, *except* that %gs.base is unchanged, and the
base is instead loaded into MSR_IA32_KERNEL_GS_BASE, which is exactly
what we want this function to do.
Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230112072032.35626-6-xin3.li@intel.com
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/fpga/fpga-mgr.h')
0 files changed, 0 insertions, 0 deletions