Hello, This patch adds a new cgroup controller, Encryption IDs, to track and limit the usage of encryption IDs on a host. AMD provides Secure Encrypted Virtualization (SEV) and SEV with Encrypted State (SEV-ES) to encrypt the guest OS's memory using limited number of Address Space Identifiers (ASIDs). This limited number of ASIDs creates issues like SEV ASID starvation and unoptimized scheduling in the cloud infrastucture. In the RFC patch v1, I provided only SEV cgroup controller but based on the feedback and discussion it became clear that this cgroup controller can be extended to be used by Intel's Trusted Domain Extension (TDX) and s390's protected virtualization Secure Execution IDs (SEID) This patch series provides a generic Encryption IDs controller with tracking support of the SEV and SEV-ES ASIDs. Changes in v5: - Changed controller filenames from encryption_ids.*.* to encids.*.* - Documentation of cgroup v1 now points to cgroup v2. Changes in v4: - The max value can be set lower than the current. - Added SEV-ES support. Changes in v3: - Fixes a build error when CONFIG_CGROUP is disabled. Changes in v2: - Changed cgroup name from sev to encryption_ids. - Replaced SEV specific names in APIs and documentations with generic encryption IDs. - Providing 3 cgroup files per encryption ID type. For example in SEV, - encryption_ids.sev.stat (only in the root cgroup directory). - encryption_ids.sev.max - encryption_ids.sev.current [1] https://lore.kernel.org/lkml/20200922004024.3699923-1-vipinsh@xxxxxxxxxx/ [2] https://lore.kernel.org/lkml/20201208213531.2626955-1-vipinsh@xxxxxxxxxx/ [3] https://lore.kernel.org/lkml/20201209205413.3391139-1-vipinsh@xxxxxxxxxx/ [4] https://lore.kernel.org/lkml/20210108012846.4134815-1-vipinsh@xxxxxxxxxx/ Vipin Sharma (2): cgroup: svm: Add Encryption ID controller cgroup: svm: Encryption IDs cgroup documentation. .../admin-guide/cgroup-v1/encryption_ids.rst | 1 + Documentation/admin-guide/cgroup-v2.rst | 78 +++- arch/x86/kvm/svm/sev.c | 52 ++- include/linux/cgroup_subsys.h | 4 + include/linux/encryption_ids_cgroup.h | 72 +++ include/linux/kvm_host.h | 4 + init/Kconfig | 14 + kernel/cgroup/Makefile | 1 + kernel/cgroup/encryption_ids.c | 421 ++++++++++++++++++ 9 files changed, 633 insertions(+), 14 deletions(-) create mode 100644 Documentation/admin-guide/cgroup-v1/encryption_ids.rst create mode 100644 include/linux/encryption_ids_cgroup.h create mode 100644 kernel/cgroup/encryption_ids.c -- 2.30.0.284.gd98b1dd5eaa7-goog
