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Message-Id: <b16dae9d6b0db5d9801ddbebbfd83384097c61f3.1505663533.git.luto@kernel.org>
Date: Sun, 17 Sep 2017 09:03:50 -0700
From: Andy Lutomirski <luto@...nel.org>
To: X86 ML <x86@...nel.org>
Cc: Borislav Petkov <bpetkov@...e.de>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Andy Lutomirski <luto@...nel.org>
Subject: [PATCH 3/4] x86/mm/32: Move setup_clear_cpu_cap(X86_FEATURE_PCID) earlier
Otherwise we might have the PCID feature bit set during cpu_init().
This is just for robustness. I haven't seen any actual bugs here.
Fixes: cba4671af755 ("x86/mm: Disable PCID on 32-bit kernels")
Signed-off-by: Andy Lutomirski <luto@...nel.org>
---
arch/x86/kernel/cpu/bugs.c | 8 --------
arch/x86/kernel/cpu/common.c | 8 ++++++++
2 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index db684880d74a..0af86d9242da 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -21,14 +21,6 @@
void __init check_bugs(void)
{
-#ifdef CONFIG_X86_32
- /*
- * Regardless of whether PCID is enumerated, the SDM says
- * that it can't be enabled in 32-bit mode.
- */
- setup_clear_cpu_cap(X86_FEATURE_PCID);
-#endif
-
identify_boot_cpu();
if (!IS_ENABLED(CONFIG_SMP)) {
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 775f10100d7f..c9176bae7fd8 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -904,6 +904,14 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c)
setup_force_cpu_cap(X86_FEATURE_ALWAYS);
fpu__init_system(c);
+
+#ifdef CONFIG_X86_32
+ /*
+ * Regardless of whether PCID is enumerated, the SDM says
+ * that it can't be enabled in 32-bit mode.
+ */
+ setup_clear_cpu_cap(X86_FEATURE_PCID);
+#endif
}
void __init early_cpu_init(void)
--
2.13.5
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