KVM/MIPS32: Infrastructure/build files.

- Add the KVM option to MIPS build files.
- Add default config files for KVM host/guest kernels.
- Change the link address for the Malta KVM Guest kernel to UM (0x40100000).
- Add KVM Kconfig file with KVM/MIPS specific options
Signed-off-by: Sanjay Lal <sanjayl@kymasys.com>
Cc: kvm@vger.kernel.org
Cc: linux-mips@linux-mips.org
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Kbuild

@@ -17,3 +17,7 @@ obj- := $(platform-)
 obj-y += kernel/
 obj-y += mm/
 obj-y += math-emu/
+
+ifdef CONFIG_KVM
+obj-y += kvm/
+endif

arch/mips/Kconfig

@@ -1242,6 +1242,7 @@ config CPU_MIPS32_R2
 	select CPU_HAS_PREFETCH
 	select CPU_SUPPORTS_32BIT_KERNEL
 	select CPU_SUPPORTS_HIGHMEM
+	select HAVE_KVM
 	help
 	  Choose this option to build a kernel for release 2 or later of the
 	  MIPS32 architecture.  Most modern embedded systems with a 32-bit
@@ -1743,6 +1744,20 @@ config 64BIT
 
 endchoice
 
+config KVM_GUEST
+	bool "KVM Guest Kernel"
+	help
+	  Select this option if building a guest kernel for KVM (Trap & Emulate) mode
+
+config KVM_HOST_FREQ
+	int "KVM Host Processor Frequency (MHz)"
+	depends on KVM_GUEST
+	default 500
+	help
+	  Select this option if building a guest kernel for KVM to skip
+	  RTC emulation when determining guest CPU Frequency.  Instead, the guest
+	  processor frequency is automatically derived from the host frequency.
+
 choice
 	prompt "Kernel page size"
 	default PAGE_SIZE_4KB
@@ -2023,6 +2038,7 @@ config SB1_PASS_2_1_WORKAROUNDS
 	depends on CPU_SB1 && CPU_SB1_PASS_2
 	default y
 
+
 config 64BIT_PHYS_ADDR
 	bool
 
@@ -2556,3 +2572,5 @@ source "security/Kconfig"
 source "crypto/Kconfig"
 
 source "lib/Kconfig"
+
+source "arch/mips/kvm/Kconfig"

arch/mips/kvm/Kconfig

+#
+# KVM configuration
+#
+source "virt/kvm/Kconfig"
+
+menuconfig VIRTUALIZATION
+	bool "Virtualization"
+	depends on HAVE_KVM
+	---help---
+	  Say Y here to get to see options for using your Linux host to run
+	  other operating systems inside virtual machines (guests).
+	  This option alone does not add any kernel code.
+
+	  If you say N, all options in this submenu will be skipped and disabled.
+
+if VIRTUALIZATION
+
+config KVM
+	tristate "Kernel-based Virtual Machine (KVM) support"
+	depends on HAVE_KVM
+	select PREEMPT_NOTIFIERS
+	select ANON_INODES
+	select KVM_MMIO
+	---help---
+	  Support for hosting Guest kernels.
+	  Currently supported on MIPS32 processors.
+
+config KVM_MIPS_DYN_TRANS
+	bool "KVM/MIPS: Dynamic binary translation to reduce traps"
+	depends on KVM
+	---help---
+	  When running in Trap & Emulate mode patch privileged
+	  instructions to reduce the number of traps.
+
+	  If unsure, say Y.
+
+config KVM_MIPS_DEBUG_COP0_COUNTERS
+	bool "Maintain counters for COP0 accesses"
+	depends on KVM
+	---help---
+	  Maintain statistics for Guest COP0 accesses.
+	  A histogram of COP0 accesses is printed when the VM is
+	  shutdown.
+
+	  If unsure, say N.
+
+source drivers/vhost/Kconfig
+
+endif # VIRTUALIZATION

arch/mips/mti-malta/Platform

@@ -3,5 +3,9 @@
 #
 platform-$(CONFIG_MIPS_MALTA)	+= mti-malta/
 cflags-$(CONFIG_MIPS_MALTA)	+= -I$(srctree)/arch/mips/include/asm/mach-malta
-load-$(CONFIG_MIPS_MALTA)	+= 0xffffffff80100000
+ifdef CONFIG_KVM_GUEST
+    load-$(CONFIG_MIPS_MALTA)	+= 0x0000000040100000
+else
+    load-$(CONFIG_MIPS_MALTA)	+= 0xffffffff80100000
+endif
 all-$(CONFIG_MIPS_MALTA)	:= $(COMPRESSION_FNAME).bin