As a first step to splitting the Shadow MMU out of KVM MMU common code,
add separate files for it with some of the boilerplate and includes the
Shadow MMU will need.

No functional change intended.

Signed-off-by: Ben Gardon <bgardon@google.com>
---
 arch/x86/kvm/Makefile         |  2 +-
 arch/x86/kvm/mmu/mmu.c        |  1 +
 arch/x86/kvm/mmu/shadow_mmu.c | 23 +++++++++++++++++++++++
 arch/x86/kvm/mmu/shadow_mmu.h | 21 +++++++++++++++++++++
 4 files changed, 46 insertions(+), 1 deletion(-)
 create mode 100644 arch/x86/kvm/mmu/shadow_mmu.c
 create mode 100644 arch/x86/kvm/mmu/shadow_mmu.h

diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index 80e3fe184d17e..d6e94660b006e 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -12,7 +12,7 @@ include $(srctree)/virt/kvm/Makefile.kvm
 kvm-y			+= x86.o emulate.o i8259.o irq.o lapic.o \
 			   i8254.o ioapic.o irq_comm.o cpuid.o pmu.o mtrr.o \
 			   hyperv.o debugfs.o mmu/mmu.o mmu/page_track.o \
-			   mmu/spte.o
+			   mmu/spte.o mmu/shadow_mmu.o
 
 ifdef CONFIG_HYPERV
 kvm-y			+= kvm_onhyperv.o
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 3674bde2203b2..752c38d625a32 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -21,6 +21,7 @@
 #include "mmu.h"
 #include "mmu_internal.h"
 #include "tdp_mmu.h"
+#include "shadow_mmu.h"
 #include "x86.h"
 #include "kvm_cache_regs.h"
 #include "smm.h"
diff --git a/arch/x86/kvm/mmu/shadow_mmu.c b/arch/x86/kvm/mmu/shadow_mmu.c
new file mode 100644
index 0000000000000..eee5a6796d9b0
--- /dev/null
+++ b/arch/x86/kvm/mmu/shadow_mmu.c
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KVM Shadow MMU
+ *
+ * Extracted from mmu.c
+ *
+ * Copyright (C) 2006 Qumranet, Inc.
+ * Copyright 2010 Red Hat, Inc. and/or its affiliates.
+ * Copyright (C) 2023, Google, Inc.
+ *
+ * Original authors:
+ *   Yaniv Kamay  <yaniv@qumranet.com>
+ *   Avi Kivity   <avi@qumranet.com>
+ */
+#include "mmu.h"
+#include "mmu_internal.h"
+#include "mmutrace.h"
+#include "shadow_mmu.h"
+#include "spte.h"
+
+#include <asm/vmx.h>
+#include <asm/cmpxchg.h>
+#include <trace/events/kvm.h>
diff --git a/arch/x86/kvm/mmu/shadow_mmu.h b/arch/x86/kvm/mmu/shadow_mmu.h
new file mode 100644
index 0000000000000..2bfba6ad20688
--- /dev/null
+++ b/arch/x86/kvm/mmu/shadow_mmu.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * KVM Shadow MMU
+ *
+ * Extracted from mmu.c
+ *
+ * Copyright (C) 2006 Qumranet, Inc.
+ * Copyright 2010 Red Hat, Inc. and/or its affiliates.
+ * Copyright (C) 2023, Google, Inc.
+ *
+ * Original authors:
+ *   Yaniv Kamay  <yaniv@qumranet.com>
+ *   Avi Kivity   <avi@qumranet.com>
+ */
+
+#ifndef __KVM_X86_MMU_SHADOW_MMU_H
+#define __KVM_X86_MMU_SHADOW_MMU_H
+
+#include <linux/kvm_host.h>
+
+#endif /* __KVM_X86_MMU_SHADOW_MMU_H */
-- 
2.39.1.519.gcb327c4b5f-goog