linux-kernel - [RFC PATCH v1 31/37] KVM: selftests: Provide common function to set memory attributes

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Message-ID: <e1e189b70461a6bf0cb8e71c1a18e0f9b553fee2.1760731772.git.ackerleytng@google.com>
Date: Fri, 17 Oct 2025 13:12:12 -0700
From: Ackerley Tng <ackerleytng@...gle.com>
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Subject: [RFC PATCH v1 31/37] KVM: selftests: Provide common function to set
 memory attributes

From: Sean Christopherson <seanjc@...gle.com>

Introduce vm_mem_set_memory_attributes(), which handles setting of memory
attributes for a range of guest physical addresses, regardless of whether
the attributes should be set via guest_memfd or via the memory attributes
at the VM level.

Refactor existing vm_mem_set_{shared,private} functions to use the new
function.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
Co-developed-by: Ackerley Tng <ackerleytng@...gle.com>
Signed-off-by: Ackerley Tng <ackerleytng@...gle.com>
---
 .../testing/selftests/kvm/include/kvm_util.h  | 44 ++++++++++++++-----
 1 file changed, 32 insertions(+), 12 deletions(-)

diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
index e9c2696770cf0..9f5338bd82b24 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -435,18 +435,6 @@ static inline void vm_set_memory_attributes(struct kvm_vm *vm, uint64_t gpa,
 	vm_ioctl(vm, KVM_SET_MEMORY_ATTRIBUTES2, &attr);
 }
 
-static inline void vm_mem_set_private(struct kvm_vm *vm, uint64_t gpa,
-				      uint64_t size)
-{
-	vm_set_memory_attributes(vm, gpa, size, KVM_MEMORY_ATTRIBUTE_PRIVATE);
-}
-
-static inline void vm_mem_set_shared(struct kvm_vm *vm, uint64_t gpa,
-				     uint64_t size)
-{
-	vm_set_memory_attributes(vm, gpa, size, 0);
-}
-
 static inline int __gmem_set_memory_attributes(int fd, loff_t offset,
 					       uint64_t size,
 					       uint64_t attributes,
@@ -507,6 +495,38 @@ static inline void gmem_set_shared(int fd, loff_t offset, uint64_t size)
 	gmem_set_memory_attributes(fd, offset, size, 0);
 }
 
+static inline void vm_mem_set_memory_attributes(struct kvm_vm *vm, uint64_t gpa,
+						uint64_t size, uint64_t attrs)
+{
+	if (kvm_has_gmem_attributes) {
+		uint64_t end = gpa + size;
+		uint64_t addr, len;
+		off_t fd_offset;
+		int fd;
+
+		for (addr = gpa; addr < end; addr += len) {
+			fd = kvm_gpa_to_guest_memfd(vm, gpa, &fd_offset, &len);
+			len = min(end - addr, len);
+
+			gmem_set_memory_attributes(fd, fd_offset, len, attrs);
+		}
+	} else {
+		vm_set_memory_attributes(vm, gpa, size, attrs);
+	}
+}
+
+static inline void vm_mem_set_private(struct kvm_vm *vm, uint64_t gpa,
+				      uint64_t size)
+{
+	vm_mem_set_memory_attributes(vm, gpa, size, KVM_MEMORY_ATTRIBUTE_PRIVATE);
+}
+
+static inline void vm_mem_set_shared(struct kvm_vm *vm, uint64_t gpa,
+				     uint64_t size)
+{
+	vm_mem_set_memory_attributes(vm, gpa, size, 0);
+}
+
 void vm_guest_mem_fallocate(struct kvm_vm *vm, uint64_t gpa, uint64_t size,
 			    bool punch_hole);
 
-- 
2.51.0.858.gf9c4a03a3a-goog