[libvirt] [PATCH 06/19] vircgroup: introduce virCgroupV2DeviceCreateProg
This function creates new BPF program with new empty BPF map with the
default size and attaches it to the guest cgroup.
Signed-off-by: Pavel Hrdina <phrdina(a)redhat.com>
---
src/util/vircgroupv2.c | 43 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 43 insertions(+)
diff --git a/src/util/vircgroupv2.c b/src/util/vircgroupv2.c
index 86adbc4ff9..ae9aafd9a4 100644
--- a/src/util/vircgroupv2.c
+++ b/src/util/vircgroupv2.c
@@ -1828,6 +1828,49 @@ virCgroupV2DeviceDetectProg(virCgroupPtr group)
}
+# define VIR_CGROUP_V2_INITIAL_BPF_MAP_SIZE 64
+
+static int
+virCgroupV2DeviceCreateMap(size_t size)
+{
+ int mapfd = virBPFCreateMap(BPF_MAP_TYPE_HASH, sizeof(__u64),
+ sizeof(__u32), size);
+
+ if (mapfd < 0) {
+ virReportSystemError(errno, "%s",
+ _("failed to initialize device BPF map"));
+ return -1;
+ }
+
+ return mapfd;
+}
+
+
+static int
+virCgroupV2DeviceCreateProg(virCgroupPtr group)
+{
+ int mapfd;
+
+ if (group->unified.devices.progfd > 0 &&
group->unified.devices.mapfd > 0)
+ return 0;
+
+ mapfd = virCgroupV2DeviceCreateMap(VIR_CGROUP_V2_INITIAL_BPF_MAP_SIZE);
+ if (mapfd < 0)
+ return -1;
+
+ if (virCgroupV2DeviceAttachProg(group, mapfd,
+ VIR_CGROUP_V2_INITIAL_BPF_MAP_SIZE) < 0) {
+ goto error;
+ }
+
+ return 0;
+
+ error:
+ VIR_FORCE_CLOSE(mapfd);
+ return -1;
+}
+
+
virCgroupBackend virCgroupV2Backend = {
.type = VIR_CGROUP_BACKEND_TYPE_V2,
--
2.20.1