diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2018-07-13 16:23:18 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-07-13 16:29:53 +0200 |
| commit | a7b9020b06ec6d7c3f3b0d4ef1a9eba12654f4f7 (patch) | |
| tree | 012e70c3a50c1a323dc0a396406fa211dc45c75c /arch/x86/kernel/cpu/bugs.c | |
| parent | 2f055947ae5e2741fb2dc5bba1033c417ccf4faa (diff) | |
x86/l1tf: Handle EPT disabled state proper
If Extended Page Tables (EPT) are disabled or not supported, no L1D
flushing is required. The setup function can just avoid setting up the L1D
flush for the EPT=n case.
Invoke it after the hardware setup has be done and enable_ept has the
correct state and expose the EPT disabled state in the mitigation status as
well.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Jiri Kosina <jkosina@suse.cz>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lkml.kernel.org/r/20180713142322.612160168@linutronix.de
Diffstat (limited to 'arch/x86/kernel/cpu/bugs.c')
| -rw-r--r-- | arch/x86/kernel/cpu/bugs.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index 8aba7d3abccb..1b3dc586d29d 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -697,10 +697,11 @@ static void __init l1tf_select_mitigation(void) #if IS_ENABLED(CONFIG_KVM_INTEL) static const char *l1tf_vmx_states[] = { - [VMENTER_L1D_FLUSH_AUTO] = "auto", - [VMENTER_L1D_FLUSH_NEVER] = "vulnerable", - [VMENTER_L1D_FLUSH_COND] = "conditional cache flushes", - [VMENTER_L1D_FLUSH_ALWAYS] = "cache flushes", + [VMENTER_L1D_FLUSH_AUTO] = "auto", + [VMENTER_L1D_FLUSH_NEVER] = "vulnerable", + [VMENTER_L1D_FLUSH_COND] = "conditional cache flushes", + [VMENTER_L1D_FLUSH_ALWAYS] = "cache flushes", + [VMENTER_L1D_FLUSH_EPT_DISABLED] = "EPT disabled", }; static ssize_t l1tf_show_state(char *buf) |