x86/vpmu: separate amd/intel vPMU code

Build AMD vPMU when CONFIG_AMD is on, and Intel vPMU when CONFIG_INTEL
is on respectively, allowing for a plaftorm-specific build.

No functional change intended.

Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@epam.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Acked-by: Jan Beulich <jbeulich@suse.com>

xen/arch/x86/cpu/Makefile

@@ -10,4 +10,6 @@ obj-y += intel.o
 obj-y += intel_cacheinfo.o
 obj-y += mwait-idle.o
 obj-y += shanghai.o
-obj-y += vpmu.o vpmu_amd.o vpmu_intel.o
+obj-y += vpmu.o
+obj-$(CONFIG_AMD) += vpmu_amd.o
+obj-$(CONFIG_INTEL) += vpmu_intel.o

xen/arch/x86/cpu/vpmu.c

@@ -827,6 +827,7 @@ static int __init cf_check vpmu_init(void)
 
     switch ( vendor )
     {
+#ifdef CONFIG_AMD
     case X86_VENDOR_AMD:
         ops = amd_vpmu_init();
         break;
@@ -834,10 +835,13 @@ static int __init cf_check vpmu_init(void)
     case X86_VENDOR_HYGON:
         ops = hygon_vpmu_init();
         break;
+#endif
 
+#ifdef CONFIG_INTEL
     case X86_VENDOR_INTEL:
         ops = core2_vpmu_init();
         break;
+#endif
 
     default:
         printk(XENLOG_WARNING "VPMU: Unknown CPU vendor: %d. "