diff options
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/cpu/intel.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c index 0c859c91d008..9a26e972cdea 100644 --- a/arch/x86/kernel/cpu/intel.c +++ b/arch/x86/kernel/cpu/intel.c @@ -45,6 +45,7 @@ enum split_lock_detect_state { * split lock detect, unless there is a command line override. */ static enum split_lock_detect_state sld_state __ro_after_init = sld_off; +static u64 msr_test_ctrl_cache __ro_after_init; /* * Processors which have self-snooping capability can handle conflicting @@ -1034,6 +1035,8 @@ static void __init split_lock_setup(void) break; } + rdmsrl(MSR_TEST_CTRL, msr_test_ctrl_cache); + if (!split_lock_verify_msr(true)) { pr_info("MSR access failed: Disabled\n"); return; @@ -1050,14 +1053,10 @@ static void __init split_lock_setup(void) */ static void sld_update_msr(bool on) { - u64 test_ctrl_val; - - rdmsrl(MSR_TEST_CTRL, test_ctrl_val); + u64 test_ctrl_val = msr_test_ctrl_cache; if (on) test_ctrl_val |= MSR_TEST_CTRL_SPLIT_LOCK_DETECT; - else - test_ctrl_val &= ~MSR_TEST_CTRL_SPLIT_LOCK_DETECT; wrmsrl(MSR_TEST_CTRL, test_ctrl_val); } |