docs: add docs/spec-conformance.md

Signed-off-by: Akihiro Suda <[email protected]>

README.md

@@ -298,6 +298,7 @@ WantedBy=multi-user.target
 
 ## More documentation
 
+* [Spec conformance](./docs/spec-conformance.md)
 * [cgroup v2](./docs/cgroup-v2.md)
 * [Checkpoint and restore](./docs/checkpoint-restore.md)
 * [systemd cgroup driver](./docs/systemd.md)

docs/spec-conformance.md

@@ -0,0 +1,17 @@
+# Spec conformance
+
+This branch of runc implements the [OCI Runtime Spec v1.1.0-rc.1](https://github.com/opencontainers/runtime-spec/tree/v1.1.0-rc.1)
+for the `linux` platform.
+
+The following features are not implemented yet:
+
+Spec version | Feature                                  | PR
+-------------|------------------------------------------|----------------------------------------------------------
+v1.0.0       | `SCMP_ARCH_PARISC`                       | Unplanned, due to lack of users
+v1.0.0       | `SCMP_ARCH_PARISC64`                     | Unplanned, due to lack of users
+v1.0.2       | `.linux.personality`                     | [#3126](https://github.com/opencontainers/runc/pull/3126)
+v1.1.0-rc.1  | `.linux.resources.cpu.burst`             | [#3205](https://github.com/opencontainers/runc/pull/3205)
+v1.1.0-rc.1  | `.domainname`                            | [#3600](https://github.com/opencontainers/runc/pull/3600)
+v1.1.0-rc.1  | `.[]mounts.uidMappings`                  | [#3717](https://github.com/opencontainers/runc/pull/3717)
+v1.1.0-rc.1  | `.[]mounts.gidMappings`                  | [#3717](https://github.com/opencontainers/runc/pull/3717)
+v1.1.0-rc.1  | `SECCOMP_FILTER_FLAG_WAIT_KILLABLE_RECV` | TODO