x86/centaur: Use common IA32_FEAT_CTL MSR initialization

Use the recently added IA32_FEAT_CTL MSR initialization sequence to
opportunistically enable VMX support when running on a Centaur CPU.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20191221044513.21680-7-sean.j.christopherson@intel.com

arch/x86/Kconfig.cpu

@@ -389,7 +389,7 @@ config X86_DEBUGCTLMSR
 
 config IA32_FEAT_CTL
 	def_bool y
-	depends on CPU_SUP_INTEL
+	depends on CPU_SUP_INTEL || CPU_SUP_CENTAUR
 
 menuconfig PROCESSOR_SELECT
 	bool "Supported processor vendors" if EXPERT

arch/x86/kernel/cpu/centaur.c

@@ -250,6 +250,8 @@ static void init_centaur(struct cpuinfo_x86 *c)
 	set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
 #endif
 
+	init_ia32_feat_ctl(c);
+
 	if (cpu_has(c, X86_FEATURE_VMX))
 		centaur_detect_vmx_virtcap(c);
 }