KVM: Consolidate private memory and guest_memfd ifdeffery in kvm_host.h

Move the kvm_arch_has_private_mem() stub and a few guest_memfd function
definitions/declarations "down" in kvm_host.h to utilize existing #ifdefs,
and so that related code is clustered together.

No functional change intended.

Signed-off-by: Ackerley Tng <ackerleytng@google.com>
Tested-by: Shivank Garg <shivankg@amd.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Reviewed-by: David Hildenbrand (Arm) <david@kernel.org>
Tested-by: Yan Zhao <yan.y.zhao@intel.com>
Link: https://patch.msgid.link/20260910-gmem-inplace-conversion-v13-10-dd6fbf94f4e1@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

1 files changed, 16 insertions, 21 deletions

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index b0110143d2ff..ab87effdd221 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -722,27 +722,6 @@ static inline int kvm_arch_vcpu_memslots_id(struct kvm_vcpu *vcpu)
 }
 #endif
 
-#ifndef kvm_arch_has_private_mem
-static inline bool kvm_arch_has_private_mem(struct kvm *kvm)
-{
-	return false;
-}
-#endif
-
-#ifdef CONFIG_KVM_GUEST_MEMFD
-bool kvm_arch_supports_gmem_init_shared(struct kvm *kvm);
-
-static inline u64 kvm_gmem_get_supported_flags(struct kvm *kvm)
-{
-	u64 flags = GUEST_MEMFD_FLAG_MMAP;
-
-	if (!kvm || kvm_arch_supports_gmem_init_shared(kvm))
-		flags |= GUEST_MEMFD_FLAG_INIT_SHARED;
-
-	return flags;
-}
-#endif
-
 #ifndef kvm_arch_has_readonly_mem
 static inline bool kvm_arch_has_readonly_mem(struct kvm *kvm)
 {
@@ -2592,6 +2571,11 @@ static inline bool kvm_is_private_gfn(struct kvm *kvm, gfn_t gfn)
 #else
 #define gmem_in_place_conversion false
 
+static inline bool kvm_arch_has_private_mem(struct kvm *kvm)
+{
+	return false;
+}
+
 static inline bool kvm_is_private_gfn(struct kvm *kvm, gfn_t gfn)
 {
 	return false;
@@ -2600,6 +2584,17 @@ static inline bool kvm_is_private_gfn(struct kvm *kvm, gfn_t gfn)
 
 #ifdef CONFIG_KVM_GUEST_MEMFD
 bool kvm_gmem_is_private_gfn(struct kvm *kvm, gfn_t gfn);
+bool kvm_arch_supports_gmem_init_shared(struct kvm *kvm);
+
+static inline u64 kvm_gmem_get_supported_flags(struct kvm *kvm)
+{
+	u64 flags = GUEST_MEMFD_FLAG_MMAP;
+
+	if (!kvm || kvm_arch_supports_gmem_init_shared(kvm))
+		flags |= GUEST_MEMFD_FLAG_INIT_SHARED;
+
+	return flags;
+}
 
 int kvm_gmem_get_pfn(struct kvm *kvm, struct kvm_memory_slot *slot,
 		     gfn_t gfn, kvm_pfn_t *pfn, int *max_order);