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92cbbadf |
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12-Jan-2023 |
H. Peter Anvin (Intel) <hpa@zytor.com> |
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>
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| #
ae53fa18 |
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12-Jan-2023 |
H. Peter Anvin (Intel) <hpa@zytor.com> |
x86/gsseg: Move load_gs_index() to its own new header file
GS is a special segment on x86_64, move load_gs_index() to its own new
header file to simplify header inclusion.
No change in functionality.
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>
Link: https://lore.kernel.org/r/20230112072032.35626-5-xin3.li@intel.com
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