linux-kernel - Re: [Patch v2 0/2] cgroup: KVM: New Encryption IDs cgroup controller

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Date:   Wed, 9 Dec 2020 12:33:22 -0800
From:   Vipin Sharma <vipinsh@...gle.com>
To:     thomas.lendacky@....com, brijesh.singh@....com, jon.grimm@....com,
        eric.vantassell@....com, pbonzini@...hat.com, seanjc@...gle.com,
        tj@...nel.org, lizefan@...wei.com, hannes@...xchg.org,
        frankja@...ux.ibm.com, borntraeger@...ibm.com, corbet@....net
Cc:     joro@...tes.org, vkuznets@...hat.com, wanpengli@...cent.com,
        jmattson@...gle.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, hpa@...or.com, gingell@...gle.com,
        rientjes@...gle.com, dionnaglaze@...gle.com, kvm@...r.kernel.org,
        x86@...nel.org, cgroups@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [Patch v2 0/2] cgroup: KVM: New Encryption IDs cgroup controller

On Tue, Dec 08, 2020 at 01:35:29PM -0800, Vipin Sharma wrote:
> 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 ASIDs.
> 
> 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
> 
> Thanks
> Vipin Sharma
> 
> [1] https://lore.kernel.org/lkml/20200922004024.3699923-1-vipinsh@google.com/#r
> 
> Vipin Sharma (2):
>   cgroup: svm: Add Encryption ID controller
>   cgroup: svm: Encryption IDs cgroup documentation.
> 
>  .../admin-guide/cgroup-v1/encryption_ids.rst  | 108 +++++
>  Documentation/admin-guide/cgroup-v2.rst       |  78 +++-
>  arch/x86/kvm/svm/sev.c                        |  28 +-
>  include/linux/cgroup_subsys.h                 |   4 +
>  include/linux/encryption_ids_cgroup.h         |  70 +++
>  include/linux/kvm_host.h                      |   4 +
>  init/Kconfig                                  |  14 +
>  kernel/cgroup/Makefile                        |   1 +
>  kernel/cgroup/encryption_ids.c                | 430 ++++++++++++++++++
>  9 files changed, 728 insertions(+), 9 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
> 
> --
> 2.29.2.576.ga3fc446d84-goog
> 

Please ignore this version of patch series, I will send out v3 soon. v2
has build failure when CONFIG_CGROUP is disabled.