[v6,4/5] qmp: Added new command to retrieve eBPF blob.

diff --git a/ebpf/ebpf.c b/ebpf/ebpf.c
new file mode 100644
index 0000000000..ea97c0403e
--- /dev/null
+++ b/ebpf/ebpf.c
@@ -0,0 +1,70 @@ 
+/*
+ * QEMU eBPF binary declaration routine.
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Authors:
+ *  Andrew Melnychenko <andrew@daynix.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later.  See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/queue.h"
+#include "qapi/error.h"
+#include "qapi/qapi-commands-ebpf.h"
+#include "ebpf/ebpf.h"
+
+struct ElfBinaryDataEntry {
+    int id;
+    const void *data;
+    size_t datalen;
+
+    QSLIST_ENTRY(ElfBinaryDataEntry) node;
+};
+
+static QSLIST_HEAD(, ElfBinaryDataEntry) ebpf_elf_obj_list =
+                                            QSLIST_HEAD_INITIALIZER();
+
+void ebpf_register_binary_data(int id, const void *data, size_t datalen)
+{
+    struct ElfBinaryDataEntry *dataentry = NULL;
+
+    dataentry = g_new0(struct ElfBinaryDataEntry, 1);
+    dataentry->data = data;
+    dataentry->datalen = datalen;
+    dataentry->id = id;
+
+    QSLIST_INSERT_HEAD(&ebpf_elf_obj_list, dataentry, node);
+}
+
+const void *ebpf_find_binary_by_id(int id, size_t *sz, Error **errp)
+{
+    struct ElfBinaryDataEntry *it = NULL;
+    QSLIST_FOREACH(it, &ebpf_elf_obj_list, node) {
+        if (id == it->id) {
+            *sz = it->datalen;
+            return it->data;
+        }
+    }
+
+    error_setg(errp, "can't find eBPF object with id: %d", id);
+
+    return NULL;
+}
+
+EbpfObject *qmp_request_ebpf(EbpfProgramID id, Error **errp)
+{
+    EbpfObject *ret = NULL;
+    size_t size = 0;
+    const void *data = ebpf_find_binary_by_id(id, &size, errp);
+    if (!data) {
+        return NULL;
+    }
+
+    ret = g_new0(EbpfObject, 1);
+    ret->object = g_base64_encode(data, size);
+
+    return ret;
+}
diff --git a/ebpf/ebpf.h b/ebpf/ebpf.h
new file mode 100644
index 0000000000..b6266b28b8
--- /dev/null
+++ b/ebpf/ebpf.h
@@ -0,0 +1,31 @@ 
+/*
+ * QEMU eBPF binary declaration routine.
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Authors:
+ *  Andrew Melnychenko <andrew@daynix.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later.  See the COPYING file in the top-level directory.
+ */
+
+#ifndef EBPF_H
+#define EBPF_H
+
+struct Error;
+
+void ebpf_register_binary_data(int id, const void *data,
+                               size_t datalen);
+const void *ebpf_find_binary_by_id(int id, size_t *sz,
+                                   struct Error **errp);
+
+#define ebpf_binary_init(id, fn)                                           \
+static void __attribute__((constructor)) ebpf_binary_init_ ## fn(void)     \
+{                                                                          \
+    size_t datalen = 0;                                                    \
+    const void *data = fn(&datalen);                                       \
+    ebpf_register_binary_data(id, data, datalen);                          \
+}
+
+#endif /* EBPF_H */
diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
index 24bc6cc409..8679dc452d 100644
--- a/ebpf/ebpf_rss.c
+++ b/ebpf/ebpf_rss.c
@@ -13,6 +13,8 @@ 
 
 #include "qemu/osdep.h"
 #include "qemu/error-report.h"
+#include "qapi/qapi-types-misc.h"
+#include "qapi/qapi-commands-ebpf.h"
 
 #include <bpf/libbpf.h>
 #include <bpf/bpf.h>
@@ -21,6 +23,8 @@ 
 
 #include "ebpf/ebpf_rss.h"
 #include "ebpf/rss.bpf.skeleton.h"
+#include "ebpf/ebpf.h"
+
 #include "trace.h"
 
 void ebpf_rss_init(struct EBPFRSSContext *ctx)
@@ -261,3 +265,5 @@  void ebpf_rss_unload(struct EBPFRSSContext *ctx)
     ctx->map_toeplitz_key = -1;
     ctx->map_indirections_table = -1;
 }
+
+ebpf_binary_init(EBPF_PROGRAMID_RSS, rss_bpf__elf_bytes)
diff --git a/ebpf/meson.build b/ebpf/meson.build
index 2f627d6c7d..c5bf9295a2 100644
--- a/ebpf/meson.build
+++ b/ebpf/meson.build
@@ -1 +1 @@ 
-system_ss.add(when: libbpf, if_true: files('ebpf_rss.c'), if_false: files('ebpf_rss-stub.c'))
+common_ss.add(when: libbpf, if_true: files('ebpf.c', 'ebpf_rss.c'), if_false: files('ebpf_rss-stub.c'))
diff --git a/qapi/ebpf.json b/qapi/ebpf.json
new file mode 100644
index 0000000000..bde8d2c1e8
--- /dev/null
+++ b/qapi/ebpf.json
@@ -0,0 +1,56 @@ 
+# -*- Mode: Python -*-
+# vim: filetype=python
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or later.
+# See the COPYING file in the top-level directory.
+
+##
+# = eBPF Objects
+##
+
+##
+# @EbpfObject:
+#
+# An eBPF ELF object.
+#
+# @object: the eBPF object encoded in base64
+#
+# Since: 8.2
+##
+{ 'struct': 'EbpfObject',
+  'data': {'object': 'str'},
+  'if': 'CONFIG_EBPF' }
+
+##
+# @EbpfProgramID:
+#
+# The eBPF programs that can be gotten with request-ebpf.
+#
+# @rss: Receive side scaling, technology that allows steering traffic
+#     between queues by calculation hash.  Users may set up
+#     indirection table and hash/packet types configurations.  Used
+#     with virtio-net.
+#
+# Since: 8.2
+##
+{ 'enum': 'EbpfProgramID',
+  'if': 'CONFIG_EBPF',
+  'data': [ { 'name': 'rss' } ] }
+
+##
+# @request-ebpf:
+#
+# Retrieve an eBPF object that can be loaded with libbpf.  Management
+# applications (g.e. libvirt) may load it and pass file descriptors to
+# QEMU, so they can run running QEMU without BPF capabilities.
+#
+# @id: The ID of the program to return.
+#
+# Returns: eBPF object encoded in base64.
+#
+# Since: 8.2
+##
+{ 'command': 'request-ebpf',
+  'data': { 'id': 'EbpfProgramID' },
+  'returns': 'EbpfObject',
+  'if': 'CONFIG_EBPF' }
diff --git a/qapi/meson.build b/qapi/meson.build
index 60a668b343..90047dae1c 100644
--- a/qapi/meson.build
+++ b/qapi/meson.build
@@ -33,6 +33,7 @@  qapi_all_modules = [
   'crypto',
   'cxl',
   'dump',
+  'ebpf',
   'error',
   'introspect',
   'job',
diff --git a/qapi/qapi-schema.json b/qapi/qapi-schema.json
index 6594afba31..2c82a49bae 100644
--- a/qapi/qapi-schema.json
+++ b/qapi/qapi-schema.json
@@ -53,6 +53,7 @@ 
 { 'include': 'char.json' }
 { 'include': 'dump.json' }
 { 'include': 'net.json' }
+{ 'include': 'ebpf.json' }
 { 'include': 'rdma.json' }
 { 'include': 'rocker.json' }
 { 'include': 'tpm.json' }