x86/cpu: Add a helper function x86_read_arch_cap_msr()

Add a helper function to read the IA32_ARCH_CAPABILITIES MSR.

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Neelima Krishnan <neelima.krishnan@intel.com>
Reviewed-by: Mark Gross <mgross@linux.intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>

2 files changed, 13 insertions, 4 deletions

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 9ae7d1bcd4f4..897c8302d982 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1092,19 +1092,26 @@ static bool __init cpu_matches(unsigned long which)
         return m && !!(m->driver_data & which);
 }
 
-static void __init cpu_set_bug_bits(struct cpuinfo_x86 *c)
+u64 x86_read_arch_cap_msr(void)
 {
         u64 ia32_cap = 0;
 
+        if (boot_cpu_has(X86_FEATURE_ARCH_CAPABILITIES))
+                rdmsrl(MSR_IA32_ARCH_CAPABILITIES, ia32_cap);
+
+        return ia32_cap;
+}
+
+static void __init cpu_set_bug_bits(struct cpuinfo_x86 *c)
+{
+        u64 ia32_cap = x86_read_arch_cap_msr();
+
         if (cpu_matches(NO_SPECULATION))
                 return;
 
         setup_force_cpu_bug(X86_BUG_SPECTRE_V1);
         setup_force_cpu_bug(X86_BUG_SPECTRE_V2);
 
-        if (cpu_has(c, X86_FEATURE_ARCH_CAPABILITIES))
-                rdmsrl(MSR_IA32_ARCH_CAPABILITIES, ia32_cap);
-
         if (!cpu_matches(NO_SSB) && !(ia32_cap & ARCH_CAP_SSB_NO) &&
            !cpu_has(c, X86_FEATURE_AMD_SSB_NO))
                 setup_force_cpu_bug(X86_BUG_SPEC_STORE_BYPASS);
diff --git a/arch/x86/kernel/cpu/cpu.h b/arch/x86/kernel/cpu/cpu.h
index c0e2407abdd6..a5cd0eba2746 100644
--- a/arch/x86/kernel/cpu/cpu.h
+++ b/arch/x86/kernel/cpu/cpu.h
@@ -62,4 +62,6 @@ unsigned int aperfmperf_get_khz(int cpu);
 
 extern void x86_spec_ctrl_setup_ap(void);
 
+extern u64 x86_read_arch_cap_msr(void);
+
 #endif /* ARCH_X86_CPU_H */