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authorSanjay Lal <sanjayl@kymasys.com>2012-11-21 18:34:06 -0800
committerRalf Baechle <ralf@linux-mips.org>2013-05-08 03:55:35 +0200
commit03a0331c8c715c73d877aba8c542a60b13f70ed0 (patch)
tree4f37e78eefce1f0aaee96314e49856478cb2c923
parent858dd5d4573353e2593f7ec6080bf09feeabcfc8 (diff)
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>
-rw-r--r--arch/mips/kvm/00README.txt31
-rw-r--r--arch/mips/kvm/Makefile13
2 files changed, 44 insertions, 0 deletions
diff --git a/arch/mips/kvm/00README.txt b/arch/mips/kvm/00README.txt
new file mode 100644
index 0000000..51617e4
--- /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..78d87bb
--- /dev/null
+++ b/arch/mips/kvm/Makefile
@@ -0,0 +1,13 @@
+# 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