1 files changed, 28 insertions, 0 deletions
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index db0b1a16ed..1b7bbd838c 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -92,6 +92,7 @@ static bool kvm_has_guest_debug;
 static int kvm_sstep_flags;
 static bool kvm_immediate_exit;
 static uint64_t kvm_supported_memory_attributes;
+static bool kvm_guest_memfd_supported;
 static hwaddr kvm_max_slot_size = ~0;
 
 static const KVMCapabilityInfo kvm_required_capabilites[] = {
@@ -2419,6 +2420,11 @@ static int kvm_init(MachineState *ms)
     }
 
     kvm_supported_memory_attributes = kvm_check_extension(s, KVM_CAP_MEMORY_ATTRIBUTES);
+    kvm_guest_memfd_supported =
+        kvm_check_extension(s, KVM_CAP_GUEST_MEMFD) &&
+        kvm_check_extension(s, KVM_CAP_USER_MEMORY2) &&
+        (kvm_supported_memory_attributes & KVM_MEMORY_ATTRIBUTE_PRIVATE);
+
     kvm_immediate_exit = kvm_check_extension(s, KVM_CAP_IMMEDIATE_EXIT);
     s->nr_slots = kvm_check_extension(s, KVM_CAP_NR_MEMSLOTS);
 
@@ -4138,3 +4144,25 @@ void kvm_mark_guest_state_protected(void)
 {
     kvm_state->guest_state_protected = true;
 }
+
+int kvm_create_guest_memfd(uint64_t size, uint64_t flags, Error **errp)
+{
+    int fd;
+    struct kvm_create_guest_memfd guest_memfd = {
+        .size = size,
+        .flags = flags,
+    };
+
+    if (!kvm_guest_memfd_supported) {
+        error_setg(errp, "KVM does not support guest_memfd");
+        return -1;
+    }
+
+    fd = kvm_vm_ioctl(kvm_state, KVM_CREATE_GUEST_MEMFD, &guest_memfd);
+    if (fd < 0) {
+        error_setg_errno(errp, errno, "Error creating KVM guest_memfd");
+        return -1;
+    }
+
+    return fd;
+}