KVM: powerpc: Use Makefile.kvm for common files

It's all fairly baroque but in the end, I don't think there's any reason
for $(KVM)/irqchip.o to have been handled differently, as they all end
up in $(kvm-y) in the end anyway, regardless of whether they get there
via $(common-objs-y) and the CPU-specific object lists.
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Message-Id: <20211121125451.9489-7-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/powerpc/kvm/Makefile

@@ -4,11 +4,8 @@
 #
 
 ccflags-y := -Ivirt/kvm -Iarch/powerpc/kvm
-KVM := ../../../virt/kvm
 
-common-objs-y = $(KVM)/kvm_main.o $(KVM)/eventfd.o $(KVM)/binary_stats.o
-common-objs-$(CONFIG_KVM_VFIO) += $(KVM)/vfio.o
-common-objs-$(CONFIG_KVM_MMIO) += $(KVM)/coalesced_mmio.o
+include $(srctree)/virt/kvm/Makefile.kvm
 
 common-objs-y += powerpc.o emulate_loadstore.o
 obj-$(CONFIG_KVM_EXIT_TIMING) += timing.o
@@ -125,9 +122,8 @@ kvm-book3s_32-objs := \
 kvm-objs-$(CONFIG_KVM_BOOK3S_32) := $(kvm-book3s_32-objs)
 
 kvm-objs-$(CONFIG_KVM_MPIC) += mpic.o
-kvm-objs-$(CONFIG_HAVE_KVM_IRQ_ROUTING) += $(KVM)/irqchip.o
 
-kvm-objs := $(kvm-objs-m) $(kvm-objs-y)
+kvm-y += $(kvm-objs-m) $(kvm-objs-y)
 
 obj-$(CONFIG_KVM_E500V2) += kvm.o
 obj-$(CONFIG_KVM_E500MC) += kvm.o