hw/i386/sev: Use legacy SEV VM types for older machine types

Newer 9.1 machine types will default to using the KVM_SEV_INIT2 API for creating SEV/SEV-ES going forward. However, this API results in guest measurement changes which are generally not expected for users of these older guest types and can cause disruption if they switch to a newer QEMU/kernel version. Avoid this by continuing to use the older KVM_SEV_INIT/KVM_SEV_ES_INIT APIs for older machine types. Signed-off-by: Michael Roth <michael.roth@amd.com> Message-ID: <20240409230743.962513-4-michael.roth@amd.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
qemu · Apr 23, 2024 · ea7fbd3 · ea7fbd3
1 parent 0232673
commit ea7fbd3
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diff --git a/hw/i386/pc.c b/hw/i386/pc.c
@@ -80,6 +80,7 @@
 
 GlobalProperty pc_compat_9_0[] = {
     { TYPE_X86_CPU, "guest-phys-bits", "0" },
+    { "sev-guest", "legacy-vm-type", "true" },
 };
 const size_t pc_compat_9_0_len = G_N_ELEMENTS(pc_compat_9_0);
 

diff --git a/target/i386/sev.c b/target/i386/sev.c
@@ -1417,6 +1417,7 @@ sev_guest_instance_init(Object *obj)
     object_property_add_uint32_ptr(obj, "reduced-phys-bits",
                                    &sev->reduced_phys_bits,
                                    OBJ_PROP_FLAG_READWRITE);
+    object_apply_compat_props(obj);
 }
 
 /* sev guest info */