[PATCH 3/4] i386/sev: convert the guest policy properties to custom accessors

[Luigi Leonardi <leonardi@redhat.com>]

Both SEV/SEV-ES and SEV-SNP expose a "policy" object property. The
SEV/SEV-ES one was registered as a plain uint32 pointer property, and
the SEV-SNP setter ignored the result of the visit.

Give both properties explicit getter/setter functions and check the
return value of the visit in the setters. This is preparation for
tracking whether the guest policy was set on the command line.

No functional change intended.

Signed-off-by: Luigi Leonardi <leonardi@redhat.com>
---
 target/i386/sev.c | 30 +++++++++++++++++++++++++-----
 1 file changed, 25 insertions(+), 5 deletions(-)

diff --git a/target/i386/sev.c b/target/i386/sev.c
index 465415c535..c76cdba8d2 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -2956,6 +2956,22 @@ sev_guest_class_init(ObjectClass *oc, const void *data)
             "use legacy VM type to maintain measurement compatibility with older QEMU or kernel versions.");
 }
 
+static void
+sev_guest_get_policy(Object *obj, Visitor *v, const char *name,
+                     void *opaque, Error **errp)
+{
+    visit_type_uint32(v, name, &SEV_GUEST(obj)->policy, errp);
+}
+
+static void
+sev_guest_set_policy(Object *obj, Visitor *v, const char *name,
+                     void *opaque, Error **errp)
+{
+    if (!visit_type_uint32(v, name, &SEV_GUEST(obj)->policy, errp)) {
+        return;
+    }
+}
+
 static void
 sev_guest_instance_init(Object *obj)
 {
@@ -2964,8 +2980,8 @@ sev_guest_instance_init(Object *obj)
     sev_guest->policy = DEFAULT_GUEST_POLICY;
     object_property_add_uint32_ptr(obj, "handle", &sev_guest->handle,
                                    OBJ_PROP_FLAG_READWRITE);
-    object_property_add_uint32_ptr(obj, "policy", &sev_guest->policy,
-                                   OBJ_PROP_FLAG_READWRITE);
+    object_property_add(obj, "policy", "uint32", sev_guest_get_policy,
+                        sev_guest_set_policy, NULL, NULL);
     object_apply_compat_props(obj);
 
     sev_guest->legacy_vm_type = ON_OFF_AUTO_AUTO;
@@ -3004,9 +3020,13 @@ static void
 sev_snp_guest_set_policy(Object *obj, Visitor *v, const char *name,
                          void *opaque, Error **errp)
 {
-    visit_type_uint64(v, name,
-                      (uint64_t *)&SEV_SNP_GUEST(obj)->kvm_start_conf.policy,
-                      errp);
+    SevSnpGuestState *sev_snp_guest = SEV_SNP_GUEST(obj);
+
+    if (!visit_type_uint64(v, name,
+                           (uint64_t *)&sev_snp_guest->kvm_start_conf.policy,
+                           errp)) {
+        return;
+    }
 }
 
 static char *

-- 
2.55.0