KVM: x86/mmu: Add MMU-internal header

Add mmu/mmu_internal.h to hold declarations and definitions that need
to be shared between various mmu/ files, but should not be used by
anything outside of the MMU.

Begin populating mmu_internal.h with declarations of the helpers used by
page_track.c.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200622202034.15093-4-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/mmu.h

@@ -209,10 +209,7 @@ static inline u8 permission_fault(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
 
 void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end);
 
-void kvm_mmu_gfn_disallow_lpage(struct kvm_memory_slot *slot, gfn_t gfn);
-void kvm_mmu_gfn_allow_lpage(struct kvm_memory_slot *slot, gfn_t gfn);
-bool kvm_mmu_slot_gfn_write_protect(struct kvm *kvm,
-				    struct kvm_memory_slot *slot, u64 gfn);
+int kvm_arch_write_log_dirty(struct kvm_vcpu *vcpu);
 
 int kvm_mmu_post_init_vm(struct kvm *kvm);
 void kvm_mmu_pre_destroy_vm(struct kvm *kvm);

arch/x86/kvm/mmu/mmu.c

@@ -18,6 +18,7 @@
 #include "irq.h"
 #include "ioapic.h"
 #include "mmu.h"
+#include "mmu_internal.h"
 #include "x86.h"
 #include "kvm_cache_regs.h"
 #include "kvm_emulate.h"

arch/x86/kvm/mmu/mmu_internal.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __KVM_X86_MMU_INTERNAL_H
+#define __KVM_X86_MMU_INTERNAL_H
+
+void kvm_mmu_gfn_disallow_lpage(struct kvm_memory_slot *slot, gfn_t gfn);
+void kvm_mmu_gfn_allow_lpage(struct kvm_memory_slot *slot, gfn_t gfn);
+bool kvm_mmu_slot_gfn_write_protect(struct kvm *kvm,
+				    struct kvm_memory_slot *slot, u64 gfn);
+
+#endif /* __KVM_X86_MMU_INTERNAL_H */

arch/x86/kvm/mmu/page_track.c

@@ -16,7 +16,7 @@
 
 #include <asm/kvm_page_track.h>
 
-#include "mmu.h"
+#include "mmu_internal.h"
 
 void kvm_page_track_free_memslot(struct kvm_memory_slot *slot)
 {