From: Christian Borntraeger <borntraeger@de.ibm.com>
To: Tejun Heo <tj@kernel.org>, Vipin Sharma <vipinsh@google.com>
Cc: thomas.lendacky@amd.com, brijesh.singh@amd.com,
jon.grimm@amd.com, eric.vantassell@amd.com, pbonzini@redhat.com,
seanjc@google.com, lizefan@huawei.com, hannes@cmpxchg.org,
frankja@linux.ibm.com, corbet@lwn.net, joro@8bytes.org,
vkuznets@redhat.com, wanpengli@tencent.com, jmattson@google.com,
tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
hpa@zytor.com, gingell@google.com, rientjes@google.com,
dionnaglaze@google.com, kvm@vger.kernel.org, x86@kernel.org,
cgroups@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [Patch v3 0/2] cgroup: KVM: New Encryption IDs cgroup controller
Date: Thu, 10 Dec 2020 15:54:01 +0100 [thread overview]
Message-ID: <4f7b9c3f-200e-6127-1d94-91dd9c917921@de.ibm.com> (raw)
In-Reply-To: <X9E6eZaIFDhzrqWO@mtj.duckdns.org>
On 09.12.20 21:58, Tejun Heo wrote:
> Hello,
>
> Rough take after skimming:
>
> * I don't have an overall objection. In terms of behavior, the only thing
> which stood out was input rejection depending on the current usage. The
> preferred way of handling that is rejecting future allocations rather than
> failing configuration as that makes it impossible e.g. to lower limit and
> drain existing usages from outside the container.
>
> * However, the boilerplate to usefulness ratio doesn't look too good and I
> wonder whether what we should do is adding a generic "misc" controller
> which can host this sort of static hierarchical counting. I'll think more
> on it.
We first dicussed to have
encryption_ids.stat
encryption_ids.max
encryption_ids.current
and we added the sev in later, so that we can also have tdx, seid, sgx or whatever.
Maybe also 2 or more things at the same time.
Right now this code has
encryption_ids.sev.stat
encryption_ids.sev.max
encryption_ids.sev.current
And it would be trivial to extend it to have
encryption_ids.seid.stat
encryption_ids.seid.max
encryption_ids.seid.current
on s390 instead (for our secure guests).
So in the end this is almost already a misc controller, the only thing that we
need to change is the capability to also define things other than encryption.*.*
And of course we would need to avoid adding lots of random garbage to such a thing.
But if you feel ok with the burden to keep things kind of organized a misc
controller would certainly work for the encryption ID usecase as well.
So I would be fine with the thing as is or a misc controlĺer.
Christian
next prev parent reply other threads:[~2020-12-10 14:56 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-09 20:54 [Patch v3 0/2] cgroup: KVM: New Encryption IDs cgroup controller Vipin Sharma
2020-12-09 20:54 ` [Patch v3 1/2] cgroup: svm: Add Encryption ID controller Vipin Sharma
2020-12-09 20:54 ` [Patch v3 2/2] cgroup: svm: Encryption IDs cgroup documentation Vipin Sharma
2020-12-09 20:58 ` [Patch v3 0/2] cgroup: KVM: New Encryption IDs cgroup controller Tejun Heo
2020-12-10 14:54 ` Christian Borntraeger [this message]
2020-12-10 23:44 ` David Rientjes
2020-12-16 15:27 ` Tejun Heo
2020-12-16 20:02 ` Vipin Sharma
2021-01-05 15:36 ` Tejun Heo
2021-01-06 18:45 ` Vipin Sharma
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