KVM: Require the PCI subsystem

PCI device assignment makes calls to pci code, so require it to be built
into the kernel.

Signed-off-by: Avi Kivity <avi@qumranet.com>
diff --git a/arch/ia64/kvm/Kconfig b/arch/ia64/kvm/Kconfig
index 8e99fed..f833a0b 100644
--- a/arch/ia64/kvm/Kconfig
+++ b/arch/ia64/kvm/Kconfig
@@ -20,6 +20,8 @@
 config KVM
 	tristate "Kernel-based Virtual Machine (KVM) support"
 	depends on HAVE_KVM && EXPERIMENTAL
+	# for device assignment:
+	depends on PCI
 	select PREEMPT_NOTIFIERS
 	select ANON_INODES
 	---help---