diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2022-03-08 16:30:36 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-03-15 10:32:39 +0100 |
| commit | af22700390c2f1d92dadd3eedf2738525a3a2f3a (patch) | |
| tree | 6535421fd452e6eb54f4cb2aef55782d7ee34949 /arch/x86/kernel/cpu/common.c | |
| parent | 991625f3dd2cbc4b787deb0213e2bcf8fa264b21 (diff) | |
x86/ibt,kexec: Disable CET on kexec
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20220308154318.641454603@infradead.org
Diffstat (limited to 'arch/x86/kernel/cpu/common.c')
| -rw-r--r-- | arch/x86/kernel/cpu/common.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index db1f1494caea..709acab25f3c 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -535,6 +535,12 @@ static __always_inline void setup_cet(struct cpuinfo_x86 *c) } } +__noendbr void cet_disable(void) +{ + if (cpu_feature_enabled(X86_FEATURE_IBT)) + wrmsrl(MSR_IA32_S_CET, 0); +} + /* * Some CPU features depend on higher CPUID levels, which may not always * be available due to CPUID level capping or broken virtualization |