[RFC,10/62] x86/mm: Detect MKTME early

Commit Message

Kirill A . Shutemov May 8, 2019, 2:43 p.m. UTC

We need to know the number of KeyIDs before page_ext is initialized.
We are going to use page_ext to store KeyID and it would be handly to
avoid page_ext allocation if there's no MKMTE in the system.

page_ext initialization happens before full CPU initizliation is complete.
Move detect_tme() call to early_init_intel().

Signed-off-by: Kirill A. Shutemov <[e-mail]>
---
 arch/x86/kernel/cpu/intel.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

Patch

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index e271264e238a..4c9fadb57a13 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -161,6 +161,8 @@  static bool bad_spectre_microcode(struct cpuinfo_x86 *c)
 	return false;
 }
 
+static void detect_tme(struct cpuinfo_x86 *c);
+
 static void early_init_intel(struct cpuinfo_x86 *c)
 {
 	u64 misc_enable;
@@ -311,6 +313,9 @@  static void early_init_intel(struct cpuinfo_x86 *c)
 	 */
 	if (detect_extended_topology_early(c) < 0)
 		detect_ht_early(c);
+
+	if (cpu_has(c, X86_FEATURE_TME))
+		detect_tme(c);
 }
 
 #ifdef CONFIG_X86_32
@@ -791,9 +796,6 @@  static void init_intel(struct cpuinfo_x86 *c)
 	if (cpu_has(c, X86_FEATURE_VMX))
 		detect_vmx_virtcap(c);
 
-	if (cpu_has(c, X86_FEATURE_TME))
-		detect_tme(c);
-
 	init_intel_energy_perf(c);
 
 	init_intel_misc_features(c);