[v2,08/18] KVM/MIPS32: Release notes and KVM module Makefile

Commit Message

Sanjay Lal Nov. 22, 2012, 2:34 a.m. UTC

Signed-off-by: Sanjay Lal <[e-mail]>
---
 arch/mips/kvm/00README.txt | 31 +++++++++++++++++++++++++++++++
 arch/mips/kvm/Makefile     | 17 +++++++++++++++++
 2 files changed, 48 insertions(+)
 create mode 100644 arch/mips/kvm/00README.txt
 create mode 100644 arch/mips/kvm/Makefile

Patch

diff --git a/arch/mips/kvm/00README.txt b/arch/mips/kvm/00README.txt
new file mode 100644
index 0000000..daaf280
--- /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
index 0000000..f3ed378
--- /dev/null
+++ b/arch/mips/kvm/Makefile
@@ -0,0 +1,17 @@ 
+# 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 := $(common-objs) kvm_mips.o kvm_mips_emul.o kvm_locore.o kvm_mips_int.o \
+            kvm_mips_stats.o kvm_mips_commpage.o kvm_mips_dyntrans.o
+
+ifdef CONFIG_KVM_MIPS_VZ
+kvm-objs                  += kvm_vz.o
+else
+kvm-objs                  += kvm_trap_emul.o
+endif
+obj-$(CONFIG_KVM)         += kvm.o
+obj-y                     += kvm_tlb.o kvm_cb.o