kvm: Allow build-time configuration of KVM device assignment

We hope to at some point deprecate KVM legacy device assignment in
favor of VFIO-based assignment.  Towards that end, allow legacy
device assignment to be deconfigured.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>

1 files changed, 11 insertions, 2 deletions

diff --git a/arch/ia64/kvm/Kconfig b/arch/ia64/kvm/Kconfig
index 043183a06409..990b86420cc6 100644
--- a/arch/ia64/kvm/Kconfig
+++ b/arch/ia64/kvm/Kconfig
@@ -21,8 +21,6 @@ config KVM
         tristate "Kernel-based Virtual Machine (KVM) support"
         depends on BROKEN
         depends on HAVE_KVM && MODULES
-        # for device assignment:
-        depends on PCI
         depends on BROKEN
         select PREEMPT_NOTIFIERS
         select ANON_INODES
@@ -51,6 +49,17 @@ config KVM_INTEL
           Provides support for KVM on Itanium 2 processors equipped with the VT
           extensions.
 
+config KVM_DEVICE_ASSIGNMENT
+        bool "KVM legacy PCI device assignment support"
+        depends on KVM && PCI && IOMMU_API
+        default y
+        ---help---
+          Provide support for legacy PCI device assignment through KVM.  The
+          kernel now also supports a full featured userspace device driver
+          framework through VFIO, which supersedes much of this support.
+
+          If unsure, say Y.
+
 source drivers/vhost/Kconfig
 
 endif # VIRTUALIZATION