[libvirt] [PATCH v2 05/17] vircgroup: introduce virCgroupV2DevicesCreateProg
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/libvirt_private.syms | 1 +
src/util/vircgroupv2devices.c | 53 +++++++++++++++++++++++++++++++++++
src/util/vircgroupv2devices.h | 3 ++
3 files changed, 57 insertions(+)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 7f1050ef5a..8ec188e9cd 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1614,6 +1614,7 @@ virCgroupV2Register;
# util/vircgroupv2devices.h
virCgroupV2DevicesAttachProg;
virCgroupV2DevicesAvailable;
+virCgroupV2DevicesCreateProg;
virCgroupV2DevicesDetectProg;
# util/virclosecallbacks.h
diff --git a/src/util/vircgroupv2devices.c b/src/util/vircgroupv2devices.c
index e609faa210..cd369ef6ab 100644
--- a/src/util/vircgroupv2devices.c
+++ b/src/util/vircgroupv2devices.c
@@ -299,6 +299,49 @@ virCgroupV2DevicesDetectProg(virCgroupPtr group)
VIR_FORCE_CLOSE(cgroupfd);
return ret;
}
+
+
+# define VIR_CGROUP_V2_INITIAL_BPF_MAP_SIZE 64
+
+static int
+virCgroupV2DevicesCreateMap(size_t size)
+{
+ int mapfd = virBPFCreateMap(BPF_MAP_TYPE_HASH, sizeof(uint64_t),
+ sizeof(uint32_t), size);
+
+ if (mapfd < 0) {
+ virReportSystemError(errno, "%s",
+ _("failed to initialize device BPF map"));
+ return -1;
+ }
+
+ return mapfd;
+}
+
+
+int
+virCgroupV2DevicesCreateProg(virCgroupPtr group)
+{
+ int mapfd;
+
+ if (group->unified.devices.progfd > 0 &&
group->unified.devices.mapfd > 0)
+ return 0;
+
+ mapfd = virCgroupV2DevicesCreateMap(VIR_CGROUP_V2_INITIAL_BPF_MAP_SIZE);
+ if (mapfd < 0)
+ return -1;
+
+ if (virCgroupV2DevicesAttachProg(group, mapfd,
+ VIR_CGROUP_V2_INITIAL_BPF_MAP_SIZE) < 0) {
+ goto error;
+ }
+
+ return 0;
+
+ error:
+ VIR_FORCE_CLOSE(mapfd);
+ return -1;
+}
#else /* !HAVE_DECL_BPF_CGROUP_DEVICE */
bool
virCgroupV2DevicesAvailable(virCgroupPtr group ATTRIBUTE_UNUSED)
@@ -327,4 +370,14 @@ virCgroupV2DevicesDetectProg(virCgroupPtr group ATTRIBUTE_UNUSED)
"with this kernel"));
return -1;
}
+
+
+int
+virCgroupV2DevicesCreateProg(virCgroupPtr group ATTRIBUTE_UNUSED)
+{
+ virReportSystemError(ENOSYS, "%s",
+ _("cgroups v2 BPF devices not supported "
+ "with this kernel"));
+ return -1;
+}
#endif /* !HAVE_DECL_BPF_CGROUP_DEVICE */
diff --git a/src/util/vircgroupv2devices.h b/src/util/vircgroupv2devices.h
index a8e50dcca5..bcbd761537 100644
--- a/src/util/vircgroupv2devices.h
+++ b/src/util/vircgroupv2devices.h
@@ -32,4 +32,7 @@ virCgroupV2DevicesAttachProg(virCgroupPtr group,
int
virCgroupV2DevicesDetectProg(virCgroupPtr group);
+int
+virCgroupV2DevicesCreateProg(virCgroupPtr group);
+
#endif /* LIBVIRT_VIRCGROUPV2DEVICES_H */
--
2.20.1