[PATCH RFC 19/19] vfio-user: add migration cli options and version negotiation

[Elena Ufimtseva]

From: John G Johnson <john.g.johnson@oracle.com>

Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
---
 hw/vfio/user.h |  4 ++++
 hw/vfio/pci.c  |  5 +++++
 hw/vfio/user.c | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 42 insertions(+)

diff --git a/hw/vfio/user.h b/hw/vfio/user.h
index eeb328c0a9..5542aa1932 100644
--- a/hw/vfio/user.h
+++ b/hw/vfio/user.h
@@ -70,6 +70,10 @@ struct vfio_user_version {
 /* "capabilities" members */
 #define VFIO_USER_CAP_MAX_FDS   "max_msg_fds"
 #define VFIO_USER_CAP_MAX_XFER  "max_data_xfer_size"
+#define VFIO_USER_CAP_MIGR      "migration"
+
+/* "migration" member */
+#define VFIO_USER_CAP_PGSIZE    "pgsize"
 
 #define VFIO_USER_DEF_MAX_FDS   8
 #define VFIO_USER_MAX_MAX_FDS   16
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 36f8524e7c..2f97160147 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -3688,6 +3688,11 @@ static void vfio_user_pci_reset(DeviceState *dev)
 static Property vfio_user_pci_dev_properties[] = {
     DEFINE_PROP_STRING("socket", VFIOUserPCIDevice, sock_name),
     DEFINE_PROP_BOOL("secure-dma", VFIOUserPCIDevice, secure, false),
+    DEFINE_PROP_BOOL("x-enable-migration", VFIOPCIDevice,
+                     vbasedev.enable_migration, false),
+    DEFINE_PROP_ON_OFF_AUTO("x-pre-copy-dirty-page-tracking", VFIOPCIDevice,
+                            vbasedev.pre_copy_dirty_page_tracking,
+                            ON_OFF_AUTO_ON),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/hw/vfio/user.c b/hw/vfio/user.c
index eceaeeccea..23ace82bbb 100644
--- a/hw/vfio/user.c
+++ b/hw/vfio/user.c
@@ -393,6 +393,23 @@ static int caps_parse(QDict *qdict, struct cap_entry 
caps[], Error **errp)
     return 0;
 }
 
+static int check_pgsize(QObject *qobj, Error **errp)
+{
+    QNum *qn = qobject_to(QNum, qobj);
+    uint64_t pgsize;
+
+    if (qn == NULL || !qnum_get_try_uint(qn, &pgsize)) {
+        error_setg(errp, "malformed %s", VFIO_USER_CAP_PGSIZE);
+        return -1;
+    }
+    return pgsize == 4096 ? 0 : -1;
+}
+
+static struct cap_entry caps_migr[] = {
+    { VFIO_USER_CAP_PGSIZE, check_pgsize },
+    { NULL }
+};
+
 static int check_max_fds(QObject *qobj, Error **errp)
 {
     QNum *qn = qobject_to(QNum, qobj);
@@ -417,9 +434,21 @@ static int check_max_xfer(QObject *qobj, Error **errp)
     return 0;
 }
 
+static int check_migr(QObject *qobj, Error **errp)
+{
+    QDict *qdict = qobject_to(QDict, qobj);
+
+    if (qdict == NULL || caps_parse(qdict, caps_migr, errp)) {
+        error_setg(errp, "malformed %s", VFIO_USER_CAP_MAX_FDS);
+        return -1;
+    }
+    return 0;
+}
+
 static struct cap_entry caps_cap[] = {
     { VFIO_USER_CAP_MAX_FDS, check_max_fds },
     { VFIO_USER_CAP_MAX_XFER, check_max_xfer },
+    { VFIO_USER_CAP_MIGR, check_migr },
     { NULL }
 };
 
@@ -466,8 +495,12 @@ static GString *caps_json(void)
 {
     QDict *dict = qdict_new();
     QDict *capdict = qdict_new();
+    QDict *migdict = qdict_new();
     GString *str;
 
+    qdict_put_int(migdict, VFIO_USER_CAP_PGSIZE, 4096);
+    qdict_put_obj(capdict, VFIO_USER_CAP_MIGR, QOBJECT(migdict));
+
     qdict_put_int(capdict, VFIO_USER_CAP_MAX_FDS, VFIO_USER_MAX_MAX_FDS);
     qdict_put_int(capdict, VFIO_USER_CAP_MAX_XFER, VFIO_USER_DEF_MAX_XFER);
 
-- 
2.25.1