[PATCH -v2] x86: Add a kvm config file

From: Borislav Petkov
Date: Wed May 22 2013 - 10:46:49 EST

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@xxxxxxx>

So I've been running this for a while now and seems like the cleanest
solution to me ATM.

arch/x86/Makefile | 6 ++++++
arch/x86/configs/kvm_guest.config | 28 ++++++++++++++++++++++++++++
2 files changed, 34 insertions(+)
create mode 100644 arch/x86/configs/kvm_guest.config

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 5c477260294f..91ee171f1cff 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -220,6 +220,11 @@ archclean:
$(Q)$(MAKE) $(clean)=$(boot)
$(Q)$(MAKE) $(clean)=arch/x86/tools

+ $(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'
diff --git a/arch/x86/configs/kvm_guest.config b/arch/x86/configs/kvm_guest.config
new file mode 100644
index 000000000000..f9affcc3b9f1
--- /dev/null
+++ b/arch/x86/configs/kvm_guest.config
@@ -0,0 +1,28 @@


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