KVM: x86/mmu: Move KVM-only page-track declarations to internal header

Bury the declaration of the page-track helpers that are intended only for
internal KVM use in a "private" header.  In addition to guarding against
unwanted usage of the internal-only helpers, dropping their definitions
avoids exposing other structures that should be KVM-internal, e.g. for
memslots.  This is a baby step toward making kvm_host.h a KVM-internal
header in the very distant future.

Tested-by: Yongwei Ma <yongwei.ma@intel.com>
Link: https://lore.kernel.org/r/20230729013535.1070024-22-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/include/asm/kvm_page_track.h b/arch/x86/include/asm/kvm_page_track.h
index 5c348ff..76c0070 100644 (file)
--- a/arch/x86/include/asm/kvm_page_track.h
+++ b/arch/x86/include/asm/kvm_page_track.h
@@ -2,6 +2,8 @@
 #ifndef _ASM_X86_KVM_PAGE_TRACK_H
 #define _ASM_X86_KVM_PAGE_TRACK_H
 
+#include <linux/kvm_types.h>
+
 enum kvm_page_track_mode {
        KVM_PAGE_TRACK_WRITE,
        KVM_PAGE_TRACK_MAX,
@@ -46,26 +48,12 @@ struct kvm_page_track_notifier_node {
                                    struct kvm_page_track_notifier_node *node);
 };
 
-int kvm_page_track_init(struct kvm *kvm);
-void kvm_page_track_cleanup(struct kvm *kvm);
-
-bool kvm_page_track_write_tracking_enabled(struct kvm *kvm);
-int kvm_page_track_write_tracking_alloc(struct kvm_memory_slot *slot);
-
-void kvm_page_track_free_memslot(struct kvm_memory_slot *slot);
-int kvm_page_track_create_memslot(struct kvm *kvm,
-                                 struct kvm_memory_slot *slot,
-                                 unsigned long npages);
-
 void kvm_slot_page_track_add_page(struct kvm *kvm,
                                  struct kvm_memory_slot *slot, gfn_t gfn,
                                  enum kvm_page_track_mode mode);
 void kvm_slot_page_track_remove_page(struct kvm *kvm,
                                     struct kvm_memory_slot *slot, gfn_t gfn,
                                     enum kvm_page_track_mode mode);
-bool kvm_slot_page_track_is_active(struct kvm *kvm,
-                                  const struct kvm_memory_slot *slot,
-                                  gfn_t gfn, enum kvm_page_track_mode mode);
 
 void
 kvm_page_track_register_notifier(struct kvm *kvm,
@@ -73,10 +61,5 @@ kvm_page_track_register_notifier(struct kvm *kvm,
 void
 kvm_page_track_unregister_notifier(struct kvm *kvm,
                                   struct kvm_page_track_notifier_node *n);
-void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
-                         int bytes);
-void kvm_page_track_delete_slot(struct kvm *kvm, struct kvm_memory_slot *slot);
-
-bool kvm_page_track_has_external_user(struct kvm *kvm);
 
 #endif

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 90a528d..14b5c74 100644 (file)
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -25,6 +25,7 @@
 #include "kvm_cache_regs.h"
 #include "smm.h"
 #include "kvm_emulate.h"
+#include "page_track.h"
 #include "cpuid.h"
 #include "spte.h"
 
@@ -53,7 +54,7 @@
 #include <asm/io.h>
 #include <asm/set_memory.h>
 #include <asm/vmx.h>
-#include <asm/kvm_page_track.h>
+
 #include "trace.h"
 
 extern bool itlb_multihit_kvm_mitigation;

diff --git a/arch/x86/kvm/mmu/page_track.c b/arch/x86/kvm/mmu/page_track.c
index 98fb963..ba3261d 100644 (file)
--- a/arch/x86/kvm/mmu/page_track.c
+++ b/arch/x86/kvm/mmu/page_track.c
@@ -15,10 +15,9 @@
 #include <linux/kvm_host.h>
 #include <linux/rculist.h>
 
-#include <asm/kvm_page_track.h>
-
 #include "mmu.h"
 #include "mmu_internal.h"
+#include "page_track.h"
 
 bool kvm_page_track_write_tracking_enabled(struct kvm *kvm)
 {
@@ -300,8 +299,3 @@ void kvm_page_track_delete_slot(struct kvm *kvm, struct kvm_memory_slot *slot)
                        n->track_remove_region(slot->base_gfn, slot->npages, n);
        srcu_read_unlock(&head->track_srcu, idx);
 }
-
-bool kvm_page_track_has_external_user(struct kvm *kvm)
-{
-       return !hlist_empty(&kvm->arch.track_notifier_head.track_notifier_list);
-}

diff --git a/arch/x86/kvm/mmu/page_track.h b/arch/x86/kvm/mmu/page_track.h
new file mode 100644 (file)
index 0000000..cc1c809
--- /dev/null
+++ b/arch/x86/kvm/mmu/page_track.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __KVM_X86_PAGE_TRACK_H
+#define __KVM_X86_PAGE_TRACK_H
+
+#include <linux/kvm_host.h>
+
+#include <asm/kvm_page_track.h>
+
+int kvm_page_track_init(struct kvm *kvm);
+void kvm_page_track_cleanup(struct kvm *kvm);
+
+bool kvm_page_track_write_tracking_enabled(struct kvm *kvm);
+int kvm_page_track_write_tracking_alloc(struct kvm_memory_slot *slot);
+
+void kvm_page_track_free_memslot(struct kvm_memory_slot *slot);
+int kvm_page_track_create_memslot(struct kvm *kvm,
+                                 struct kvm_memory_slot *slot,
+                                 unsigned long npages);
+
+bool kvm_slot_page_track_is_active(struct kvm *kvm,
+                                  const struct kvm_memory_slot *slot,
+                                  gfn_t gfn, enum kvm_page_track_mode mode);
+
+void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
+                         int bytes);
+void kvm_page_track_delete_slot(struct kvm *kvm, struct kvm_memory_slot *slot);
+
+static inline bool kvm_page_track_has_external_user(struct kvm *kvm)
+{
+       return !hlist_empty(&kvm->arch.track_notifier_head.track_notifier_list);
+}
+
+#endif /* __KVM_X86_PAGE_TRACK_H */

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 7928464..6c9c81e 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -25,6 +25,7 @@
 #include "tss.h"
 #include "kvm_cache_regs.h"
 #include "kvm_emulate.h"
+#include "mmu/page_track.h"
 #include "x86.h"
 #include "cpuid.h"
 #include "pmu.h"