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| author | Borislav Petkov <bp@suse.de> | 2022-01-27 12:56:22 +0100 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2022-04-04 10:16:55 +0200 |
| commit | c949110ef4e31cb5d3387bd8273fd5de66b5227b (patch) | |
| tree | 0b92285edf0b2ea6d02f3a740d61e21d1fbccbd7 | |
| parent | 1625c833db93516faaac5feedadf8d19c14238b6 (diff) | |
| download | linux-c949110ef4e31cb5d3387bd8273fd5de66b5227b.tar.bz2 | |
x86/cpu: Remove "nosep"
That chicken bit was added by
4f88651125e2 ("[PATCH] i386: allow disabling X86_FEATURE_SEP at boot")
but measuring int80 vsyscall performance on 32-bit doesn't matter
anymore.
If still needed, one can boot with
clearcpuid=sep
to disable that feature for testing.
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220127115626.14179-3-bp@alien8.de
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/common.c | 7 |
2 files changed, 0 insertions, 9 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 0ea17869a089..a9f3d3158e77 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3665,8 +3665,6 @@ nosbagart [IA-64] - nosep [BUGS=X86-32] Disables x86 SYSENTER/SYSEXIT support. - nosgx [X86-64,SGX] Disables Intel SGX kernel support. nosmp [SMP] Tells an SMP kernel to act as a UP kernel, diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 69c7ea84b005..c71d1075db93 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -298,13 +298,6 @@ static int __init cachesize_setup(char *str) } __setup("cachesize=", cachesize_setup); -static int __init x86_sep_setup(char *s) -{ - setup_clear_cpu_cap(X86_FEATURE_SEP); - return 1; -} -__setup("nosep", x86_sep_setup); - /* Standard macro to see if a specific flag is changeable */ static inline int flag_is_changeable_p(u32 flag) { |