x86, platform, kvm, kconfig: Turn existing .config's into KVM-capable configs

Add an config file snippet which enables additional options
useful for running the kernel in a kvm guest. When you execute
'make kvmconfig' it merges those options with an already
existing user config before you build the kernel.

Based on an patch from the external lkvm tree.

Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: 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
Link: http://lkml.kernel.org/r/20130522144638.GB15085@pd.tnic
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 5c477260294f6ef78b1c1de6998b4860cc64ffbb..91ee171f1cffaa5a59d69be283dd99bdaf53481e 100644 (file)
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -220,6 +220,11 @@ archclean:
        $(Q)$(MAKE) $(clean)=$(boot)
        $(Q)$(MAKE) $(clean)=arch/x86/tools
 
+kvmconfig:
+       $(if $(wildcard $(objtree)/.config),, $(error You need an existing .config for this target))
+       $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m -O $(objtree) $(objtree)/.config arch/x86/configs/kvm_guest.config
+       $(Q)yes "" | $(MAKE) oldconfig
+
 define archhelp
   echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
   echo  '  install      - Install kernel using'
@@ -233,4 +238,5 @@ define archhelp
   echo  '                  bzdisk/fdimage*/isoimage also accept:'
   echo  '                  FDARGS="..."  arguments for the booted kernel'
   echo  '                  FDINITRD=file initrd for the booted kernel'
+  echo  '  kvmconfig   - Enable additional options for guest kernel support'
 endef

diff --git a/arch/x86/configs/kvm_guest.config b/arch/x86/configs/kvm_guest.config
new file mode 100644 (file)
index 0000000..f9affcc
--- /dev/null
+++ b/arch/x86/configs/kvm_guest.config
@@ -0,0 +1,28 @@
+CONFIG_NET=y
+CONFIG_NET_CORE=y
+CONFIG_NETDEVICES=y
+CONFIG_BLOCK=y
+CONFIG_BLK_DEV=y
+CONFIG_NETWORK_FILESYSTEMS=y
+CONFIG_INET=y
+CONFIG_TTY=y
+CONFIG_SERIAL_8250=y
+CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_IP_PNP=y
+CONFIG_IP_PNP_DHCP=y
+CONFIG_BINFMT_ELF=y
+CONFIG_PCI=y
+CONFIG_PCI_MSI=y
+CONFIG_DEBUG_KERNEL=y
+CONFIG_VIRTUALIZATION=y
+CONFIG_HYPERVISOR_GUEST=y
+CONFIG_PARAVIRT=y
+CONFIG_KVM_GUEST=y
+CONFIG_VIRTIO=y
+CONFIG_VIRTIO_PCI=y
+CONFIG_VIRTIO_BLK=y
+CONFIG_VIRTIO_CONSOLE=y
+CONFIG_VIRTIO_NET=y
+CONFIG_9P_FS=y
+CONFIG_NET_9P=y
+CONFIG_NET_9P_VIRTIO=y