KVM/MIPS32: Release notes and KVM module Makefile

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>

diff --git a/arch/mips/kvm/00README.txt b/arch/mips/kvm/00README.txt
new file mode 100644 (file)
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--- /dev/null
+++ b/arch/mips/kvm/00README.txt
@@ -0,0 +1,31 @@
+KVM/MIPS Trap & Emulate Release Notes
+=====================================
+
+(1) KVM/MIPS should support MIPS32R2 and beyond. It has been tested on the following platforms:
+    Malta Board with FPGA based 34K
+    Sigma Designs TangoX board with a 24K based 8654 SoC.
+    Malta Board with 74K @ 1GHz
+
+(2) Both Guest kernel and Guest Userspace execute in UM.
+    Guest User address space:   0x00000000 -> 0x40000000
+    Guest Kernel Unmapped:      0x40000000 -> 0x60000000
+    Guest Kernel Mapped:        0x60000000 -> 0x80000000
+
+    Guest Usermode virtual memory is limited to 1GB.
+
+(2) 16K Page Sizes: Both Host Kernel and Guest Kernel should have the same page size, currently at least 16K.
+    Note that due to cache aliasing issues, 4K page sizes are NOT supported.
+
+(3) No HugeTLB Support
+    Both the host kernel and Guest kernel should have the page size set to 16K.
+    This will be implemented in a future release.
+
+(4) KVM/MIPS does not have support for SMP Guests
+    Linux-3.7-rc2 based SMP guest hangs due to the following code sequence in the generated TLB handlers:
+       LL/TLBP/SC.  Since the TLBP instruction causes a trap the reservation gets cleared
+       when we ERET back to the guest. This causes the guest to hang in an infinite loop.
+       This will be fixed in a future release.
+
+(5) Use Host FPU
+    Currently KVM/MIPS emulates a 24K CPU without a FPU.
+    This will be fixed in a future release

diff --git a/arch/mips/kvm/Makefile b/arch/mips/kvm/Makefile
new file mode 100644 (file)
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+++ b/arch/mips/kvm/Makefile
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+# Makefile for KVM support for MIPS
+#
+
+common-objs = $(addprefix ../../../virt/kvm/, kvm_main.o coalesced_mmio.o)
+
+EXTRA_CFLAGS += -Ivirt/kvm -Iarch/mips/kvm
+
+kvm-objs := $(common-objs) kvm_mips.o kvm_mips_emul.o kvm_locore.o \
+           kvm_mips_int.o kvm_mips_stats.o kvm_mips_commpage.o \
+           kvm_mips_dyntrans.o kvm_trap_emul.o
+
+obj-$(CONFIG_KVM)      += kvm.o
+obj-y                  += kvm_cb.o kvm_tlb.o