[PATCH v4 2/2] x86, arm, platform, xen, kconfig: add xen defconfig helper

["Luis R. Rodriguez" <mcgrof@do-not-panic.com>]

From: "Luis R. Rodriguez" <mcgrof@suse.com>

This lets you build a kernel which can support xen dom0
or xen guests by just using:

   make xenconfig

on both x86 and arm64 kernels. This also splits out the
options which are available currently to be built with x86
and 'make ARCH=arm64' under a shared config.

Technically xen supports a dom0 kernel and also a guest
kernel configuration but upon review with the xen team
since we don't have many dom0 options its best to just
combine these two into one.

Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: penberg@kernel.org
Cc: levinsasha928@gmail.com
Cc: mtosatti@redhat.com
Cc: fengguang.wu@intel.com
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: Ian Campbell <Ian.Campbell@citrix.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: xen-devel@lists.xenproject.org
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Michal Marek <mmarek@suse.cz>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com>
---
 arch/x86/configs/xen.config | 11 +++++++++++
 kernel/configs/xen.config   | 27 +++++++++++++++++++++++++++
 scripts/kconfig/Makefile    |  5 +++++
 3 files changed, 43 insertions(+)
 create mode 100644 arch/x86/configs/xen.config
 create mode 100644 kernel/configs/xen.config

diff --git a/arch/x86/configs/xen.config b/arch/x86/configs/xen.config
new file mode 100644
index 0000000..3281461
--- /dev/null
+++ b/arch/x86/configs/xen.config
@@ -0,0 +1,11 @@
+CONFIG_HYPERVISOR_GUEST=y
+# x86 xen specific config options
+CONFIG_XEN_PVHVM=y
+CONFIG_XEN_MAX_DOMAIN_MEMORY=500
+CONFIG_XEN_SAVE_RESTORE=y
+# CONFIG_XEN_DEBUG_FS is not set
+CONFIG_XEN_PVH=y
+CONFIG_XEN_MCE_LOG=y
+CONFIG_PCI_XEN=y
+CONFIG_XEN_PCIDEV_FRONTEND=m
+CONFIG_XEN_ACPI_PROCESSOR=m
diff --git a/kernel/configs/xen.config b/kernel/configs/xen.config
new file mode 100644
index 0000000..18eeb35
--- /dev/null
+++ b/kernel/configs/xen.config
@@ -0,0 +1,27 @@
+CONFIG_PARAVIRT=y
+# generic config
+CONFIG_XEN=y
+CONFIG_XEN_DOM0=y
+CONFIG_XEN_BLKDEV_FRONTEND=m
+CONFIG_XEN_BLKDEV_BACKEND=m
+CONFIG_XEN_NETDEV_FRONTEND=m
+CONFIG_XEN_NETDEV_BACKEND=m
+CONFIG_INPUT_XEN_KBDDEV_FRONTEND=y
+CONFIG_HVC_XEN=y
+CONFIG_HVC_XEN_FRONTEND=y
+CONFIG_XEN_WDT=m
+CONFIG_XEN_FBDEV_FRONTEND=y
+CONFIG_XEN_BALLOON=y
+CONFIG_XEN_BALLOON_MEMORY_HOTPLUG=y
+CONFIG_XEN_SCRUB_PAGES=y
+CONFIG_XEN_DEV_EVTCHN=m
+CONFIG_XEN_BACKEND=y
+CONFIG_XENFS=m
+CONFIG_XEN_COMPAT_XENFS=y
+CONFIG_XEN_SYS_HYPERVISOR=y
+CONFIG_XEN_XENBUS_FRONTEND=y
+CONFIG_XEN_GNTDEV=m
+CONFIG_XEN_GRANT_DEV_ALLOC=m
+CONFIG_SWIOTLB_XEN=y
+CONFIG_XEN_PCIDEV_BACKEND=m
+CONFIG_XEN_PRIVCMD=m
diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
index ff612b0..f4a8f89 100644
--- a/scripts/kconfig/Makefile
+++ b/scripts/kconfig/Makefile
@@ -117,6 +117,10 @@ PHONY += kvmconfig
 kvmconfig:
 	$(call mergeconfig,kvm_guest)
 
+PHONY += xenconfig
+xenconfig:
+	$(call mergeconfig,xen)
+
 PHONY += tinyconfig
 tinyconfig: allnoconfig
 	$(call mergeconfig,tiny)
@@ -142,6 +146,7 @@ help:
 	@echo  '  listnewconfig   - List new options'
 	@echo  '  olddefconfig	  - Same as silentoldconfig but sets new symbols to their default value'
 	@echo  '  kvmconfig	  - Enable additional options for kvm guest kernel support'
+	@echo  '  xenconfig       - Enable additional options for xen dom0 and guest kernel support'
 	@echo  '  tinyconfig	  - Configure the tiniest possible kernel'
 
 # lxdialog stuff
-- 
2.2.2