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Subject[PATCH] x86/cpuinfo: Clear X86_FEATURE_TME if TME/MKTME is disabled by BIOS
Date
Right now the only way to check this is by greping the kernel logs,
which is inconvinient. This is currently checked for fwupd for
example.

I understand that cpuinfo is supposed to report every feature in the
cpu but since AMD is doing the same for sme/sev I think is good to
have this for Intel too.

Signed-off-by: Martin Fernandez <martin.fernandez@eclypsium.com>
---
arch/x86/kernel/cpu/intel.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index fd5dead8371c..7311172aceaf 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -570,6 +570,8 @@ static void detect_tme(struct cpuinfo_x86 *c)

if (!TME_ACTIVATE_LOCKED(tme_activate) || !TME_ACTIVATE_ENABLED(tme_activate)) {
pr_info_once("x86/tme: not enabled by BIOS\n");
+ if (mktme_status == MKTME_UNINITIALIZED)
+ clear_cpu_cap(c, X86_FEATURE_TME);
mktme_status = MKTME_DISABLED;
return;
}
--
2.30.2
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