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vircgroup: introduce virCgroupV2DevicesCreateProg

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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@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Pavel Hrdina 2019-06-24 14:30:59 +02:00
parent ce11a5c59f
commit afa2788662
3 changed files with 54 additions and 0 deletions
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1
src/libvirt_private.syms
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@ -1719,6 +1719,7 @@ virCgroupV2Register;
# util/vircgroupv2devices.h # util/vircgroupv2devices.h
virCgroupV2DevicesAttachProg; virCgroupV2DevicesAttachProg;
virCgroupV2DevicesAvailable; virCgroupV2DevicesAvailable;
virCgroupV2DevicesCreateProg;
virCgroupV2DevicesDetectProg; virCgroupV2DevicesDetectProg;
# util/virclosecallbacks.h # util/virclosecallbacks.h

50
src/util/vircgroupv2devices.c
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@ -426,6 +426,46 @@ virCgroupV2DevicesDetectProg(virCgroupPtr group)
return 0; return 0;
} }
# 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)
{
VIR_AUTOCLOSE mapfd = -1;
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) {
return -1;
}
mapfd = -1;
return 0;
}
#else /* !HAVE_DECL_BPF_CGROUP_DEVICE */ #else /* !HAVE_DECL_BPF_CGROUP_DEVICE */
bool bool
virCgroupV2DevicesAvailable(virCgroupPtr group G_GNUC_UNUSED) virCgroupV2DevicesAvailable(virCgroupPtr group G_GNUC_UNUSED)
@ -454,4 +494,14 @@ virCgroupV2DevicesDetectProg(virCgroupPtr group G_GNUC_UNUSED)
"with this kernel")); "with this kernel"));
return -1; return -1;
} }
int
virCgroupV2DevicesCreateProg(virCgroupPtr group G_GNUC_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("cgroups v2 BPF devices not supported "
"with this kernel"));
return -1;
}
#endif /* !HAVE_DECL_BPF_CGROUP_DEVICE */ #endif /* !HAVE_DECL_BPF_CGROUP_DEVICE */

3
src/util/vircgroupv2devices.h
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@ -30,3 +30,6 @@ virCgroupV2DevicesAttachProg(virCgroupPtr group,
int int
virCgroupV2DevicesDetectProg(virCgroupPtr group); virCgroupV2DevicesDetectProg(virCgroupPtr group);
int
virCgroupV2DevicesCreateProg(virCgroupPtr group);