x86/cpu: Update cached HLE state on write to TSX_CTRL_CPUID_CLEAR

/proc/cpuinfo currently reports Hardware Lock Elision (HLE) feature to
be present on boot cpu even if it was disabled during the bootup. This
is because cpuinfo_x86->x86_capability HLE bit is not updated after TSX
state is changed via the new MSR IA32_TSX_CTRL.

Update the cached HLE bit also since it is expected to change after an
update to CPUID_CLEAR bit in MSR IA32_TSX_CTRL.

Fixes: 95c5824f75f3 ("x86/cpu: Add a "tsx=" cmdline option with TSX disabled by default")
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Neelima Krishnan <neelima.krishnan@intel.com>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/2529b99546294c893dfa1c89e2b3e46da3369a59.1578685425.git.pawan.kumar.gupta@linux.intel.com

diff --git a/arch/x86/kernel/cpu/tsx.c b/arch/x86/kernel/cpu/tsx.c
index 3e20d32..032509a 100644 (file)
--- a/arch/x86/kernel/cpu/tsx.c
+++ b/arch/x86/kernel/cpu/tsx.c
@@ -115,11 +115,12 @@ void __init tsx_init(void)
                tsx_disable();
 
                /*
-                * tsx_disable() will change the state of the
-                * RTM CPUID bit.  Clear it here since it is now
-                * expected to be not set.
+                * tsx_disable() will change the state of the RTM and HLE CPUID
+                * bits. Clear them here since they are now expected to be not
+                * set.
                 */
                setup_clear_cpu_cap(X86_FEATURE_RTM);
+               setup_clear_cpu_cap(X86_FEATURE_HLE);
        } else if (tsx_ctrl_state == TSX_CTRL_ENABLE) {
 
                /*
@@ -131,10 +132,10 @@ void __init tsx_init(void)
                tsx_enable();
 
                /*
-                * tsx_enable() will change the state of the
-                * RTM CPUID bit.  Force it here since it is now
-                * expected to be set.
+                * tsx_enable() will change the state of the RTM and HLE CPUID
+                * bits. Force them here since they are now expected to be set.
                 */
                setup_force_cpu_cap(X86_FEATURE_RTM);
+               setup_force_cpu_cap(X86_FEATURE_HLE);
        }
 }