[PATCHv3 13/17] x86/mm: Detect MKTME early

Kirill A. Shutemov
2018-06-12T14:42:23Z

We need to know number of KeyIDs before KALSR is initialized. Number of
KeyIDs would determinate how much address space would be needed for
per-KeyID direct mapping.

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

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
arch/x86/kernel/cpu/intel.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index fb58776513e6..3322b0125353 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -158,6 +158,8 @@ 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;
@@ -301,6 +303,9 @@ static void early_init_intel(struct cpuinfo_x86 *c)
}

check_mpx_erratum(c);
+
+ if (cpu_has(c, X86_FEATURE_TME))
+ detect_tme(c);
}

#ifdef CONFIG_X86_32
@@ -762,9 +767,6 @@ 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);
--
2.17.1