KVM: x86: add config for non-kvm users of page tracking

Add a config option that allows kvm to determine whether or not there
are any external users of page tracking.
Signed-off-by: NDavid Stevens <stevensd@chromium.org>
Message-Id: <20210922045859.2011227-2-stevensd@google.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/Kconfig

@@ -129,4 +129,7 @@ config KVM_MMU_AUDIT
 	 This option adds a R/W kVM module parameter 'mmu_audit', which allows
 	 auditing of KVM MMU events at runtime.
 
+config KVM_EXTERNAL_WRITE_TRACKING
+	bool
+
 endif # VIRTUALIZATION

drivers/gpu/drm/i915/Kconfig

@@ -126,6 +126,7 @@ config DRM_I915_GVT_KVMGT
 	depends on DRM_I915_GVT
 	depends on KVM
 	depends on VFIO_MDEV
+	select KVM_EXTERNAL_WRITE_TRACKING
 	default n
 	help
 	  Choose this option if you want to enable KVMGT support for