The various notifiers that are used needs to be installed only once not on
every initialization. This includes the vm state change notifier and others.
This change uses 'cgs->ready' flag to install the notifiers only one time,
the first time.

Signed-off-by: Ani Sinha <anisinha@redhat.com>
---
 target/i386/sev.c | 36 +++++++++++++++++++-----------------
 1 file changed, 19 insertions(+), 17 deletions(-)

diff --git a/target/i386/sev.c b/target/i386/sev.c
index 260d8ef88b..647f4bf63d 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -1920,8 +1920,9 @@ static int sev_common_kvm_init(ConfidentialGuestSupport *cgs, Error **errp)
         return -1;
     }
 
-    qemu_add_vm_change_state_handler(sev_vm_state_change, sev_common);
-
+    if (!cgs->ready) {
+        qemu_add_vm_change_state_handler(sev_vm_state_change, sev_common);
+    }
     cgs->ready = true;
 
     return 0;
@@ -1943,22 +1944,23 @@ static int sev_kvm_init(ConfidentialGuestSupport *cgs, Error **errp)
         return -1;
     }
 
-    /*
-     * SEV uses these notifiers to register/pin pages prior to guest use,
-     * but SNP relies on guest_memfd for private pages, which has its
-     * own internal mechanisms for registering/pinning private memory.
-     */
-    ram_block_notifier_add(&sev_ram_notifier);
-
-    /*
-     * The machine done notify event is used for SEV guests to get the
-     * measurement of the encrypted images. When SEV-SNP is enabled, the
-     * measurement is part of the guest attestation process where it can
-     * be collected without any reliance on the VMM. So skip registering
-     * the notifier for SNP in favor of using guest attestation instead.
-     */
-    qemu_add_machine_init_done_notifier(&sev_machine_done_notify);
+    if (!cgs->ready) {
+        /*
+         * SEV uses these notifiers to register/pin pages prior to guest use,
+         * but SNP relies on guest_memfd for private pages, which has its
+         * own internal mechanisms for registering/pinning private memory.
+         */
+        ram_block_notifier_add(&sev_ram_notifier);
 
+        /*
+         * The machine done notify event is used for SEV guests to get the
+         * measurement of the encrypted images. When SEV-SNP is enabled, the
+         * measurement is part of the guest attestation process where it can
+         * be collected without any reliance on the VMM. So skip registering
+         * the notifier for SNP in favor of using guest attestation instead.
+         */
+        qemu_add_machine_init_done_notifier(&sev_machine_done_notify);
+    }
     return 0;
 }
 
-- 
2.42.0