[PATCH RFC v2 07/16] vfio-user: get device info

[Elena Ufimtseva <elena.ufimtseva@oracle.com>]

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

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
---
 hw/vfio/user-protocol.h | 13 +++++++++++++
 hw/vfio/user.h          |  1 +
 hw/vfio/pci.c           | 13 +++++++++++++
 hw/vfio/user.c          | 20 ++++++++++++++++++++
 4 files changed, 47 insertions(+)

diff --git a/hw/vfio/user-protocol.h b/hw/vfio/user-protocol.h
index 14b762d1ad..13e44ebf1c 100644
--- a/hw/vfio/user-protocol.h
+++ b/hw/vfio/user-protocol.h
@@ -82,4 +82,17 @@ typedef struct {
 #define VFIO_USER_MAX_MAX_XFER  (64 * 1024 * 1024)
 
 
+/*
+ * VFIO_USER_DEVICE_GET_INFO
+ * imported from struct_device_info
+ */
+typedef struct {
+    VFIOUserHdr hdr;
+    uint32_t argsz;
+    uint32_t flags;
+    uint32_t num_regions;
+    uint32_t num_irqs;
+    uint32_t cap_offset;
+} VFIOUserDeviceInfo;
+
 #endif /* VFIO_USER_PROTOCOL_H */
diff --git a/hw/vfio/user.h b/hw/vfio/user.h
index cab957ba7a..82044e7e78 100644
--- a/hw/vfio/user.h
+++ b/hw/vfio/user.h
@@ -71,5 +71,6 @@ void vfio_user_set_reqhandler(VFIODevice *vbasdev,
                                              void *reqarg);
 void vfio_user_send_reply(VFIOProxy *proxy, char *buf, int ret);
 int vfio_user_validate_version(VFIODevice *vbasedev, Error **errp);
+int vfio_user_get_info(VFIODevice *vbasedev);
 
 #endif /* VFIO_USER_H */
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index eae33e746f..63aa2441f0 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -3369,6 +3369,7 @@ static void vfio_user_pci_realize(PCIDevice *pdev, Error **errp)
     VFIODevice *vbasedev = &vdev->vbasedev;
     SocketAddress addr;
     VFIOProxy *proxy;
+    int ret;
     Error *err = NULL;
 
     /*
@@ -3410,6 +3411,18 @@ static void vfio_user_pci_realize(PCIDevice *pdev, Error **errp)
     vbasedev->no_mmap = false;
     vbasedev->ops = &vfio_user_pci_ops;
 
+    ret = vfio_user_get_info(&vdev->vbasedev);
+    if (ret) {
+        error_setg_errno(errp, -ret, "get info failure");
+        goto error;
+    }
+
+    vfio_populate_device(vdev, &err);
+    if (err) {
+        error_propagate(errp, err);
+        goto error;
+    }
+
 error:
     vfio_user_disconnect(proxy);
     error_prepend(errp, VFIO_MSG_PREFIX, vdev->vbasedev.name);
diff --git a/hw/vfio/user.c b/hw/vfio/user.c
index e89464a571..b584b8e0f2 100644
--- a/hw/vfio/user.c
+++ b/hw/vfio/user.c
@@ -714,3 +714,23 @@ int vfio_user_validate_version(VFIODevice *vbasedev, Error **errp)
 
     return 0;
 }
+
+int vfio_user_get_info(VFIODevice *vbasedev)
+{
+    VFIOUserDeviceInfo msg;
+
+    memset(&msg, 0, sizeof(msg));
+    vfio_user_request_msg(&msg.hdr, VFIO_USER_DEVICE_GET_INFO, sizeof(msg), 0);
+    msg.argsz = sizeof(struct vfio_device_info);
+
+    vfio_user_send_recv(vbasedev->proxy, &msg.hdr, NULL, 0, 0);
+    if (msg.hdr.flags & VFIO_USER_ERROR) {
+        return -msg.hdr.error_reply;
+    }
+
+    vbasedev->num_irqs = msg.num_irqs;
+    vbasedev->num_regions = msg.num_regions;
+    vbasedev->flags = msg.flags;
+    vbasedev->reset_works = !!(msg.flags & VFIO_DEVICE_FLAGS_RESET);
+    return 0;
+}
-- 
2.25.1