hw/nvme: do not auto-generate eui64

We cannot provide auto-generated unique or persistent namespace
identifiers (EUI64, NGUID, UUID) easily. Since 6.1, namespaces have been
assigned a generated EUI64 of the form "52:54:00:<namespace counter>".
This is will be unique within a QEMU instance, but not globally.

Revert that this is assigned automatically and immediately deprecate the
compatibility parameter. Users can opt-in to this with the
`eui64-default=on` device parameter or set it explicitly with
`eui64=UINT64`.

Cc: libvir-list@redhat.com
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>

docs/about/deprecated.rst

@@ -296,6 +296,13 @@ contains native support for this feature and thus use of the option
 ROM approach is obsolete. The native SeaBIOS support can be activated
 by using ``-machine graphics=off``.
 
+``-device nvme-ns,eui64-default=on|off`` (since 7.1)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+In QEMU versions 6.1, 6.2 and 7.0, the ``nvme-ns`` generates an EUI-64
+identifer that is not globally unique. If an EUI-64 identifer is required, the
+user must set it explicitly using the ``nvme-ns`` device parameter ``eui64``.
+
 
 Block device options
 ''''''''''''''''''''

hw/core/machine.c

@@ -43,6 +43,7 @@
 
 GlobalProperty hw_compat_7_0[] = {
     { "arm-gicv3-common", "force-8-bit-prio", "on" },
+    { "nvme-ns", "eui64-default", "on"},
 };
 const size_t hw_compat_7_0_len = G_N_ELEMENTS(hw_compat_7_0);
 

hw/nvme/ns.c

@@ -641,7 +641,7 @@ static Property nvme_ns_props[] = {
     DEFINE_PROP_SIZE("zoned.zrwas", NvmeNamespace, params.zrwas, 0),
     DEFINE_PROP_SIZE("zoned.zrwafg", NvmeNamespace, params.zrwafg, -1),
     DEFINE_PROP_BOOL("eui64-default", NvmeNamespace, params.eui64_default,
-                     true),
+                     false),
     DEFINE_PROP_END_OF_LIST(),
 };