mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
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f62b057bcd
Move existing security/trusted-execution related features (i.e. SGX and
SE) under the same "security" feature, deprecating the old features. The
motivation for the change is to keep the source code and user interface
more organized as we experience a constant inflow of similar security
related features. This change will affect the user interface so it is
less painful to do it early on.
New feature labels will be:
feature.node.kubernetes.io/cpu-security.se.enabled
feature.node.kubernetes.io/cpu-security.sgx.enabled
and correspondingly new "cpu.security" feature with "se.enabled" and
"sgx.enabled" elements will be available for custom rules, for example:
- name: "sample sgx rule"
labels:
sgx.sample.feature: "true"
matchFeatures:
- feature: cpu.security
matchExpressions:
"sgx.enabled": {op: IsTrue}
At the same time deprecate old labels "cpu-sgx.enabled" and
"cpu-se.enabled" feature labels and the corresponding features for
custom rules. These will be removed in the future causing an effective
change in NFDs user interface.
54 lines
1.3 KiB
Go
54 lines
1.3 KiB
Go
//go:build amd64
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// +build amd64
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/*
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Copyright 2021 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cpu
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import (
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"github.com/klauspost/cpuid/v2"
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)
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func discoverSecurity() map[string]string {
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elems := make(map[string]string)
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if sgxEnabled() {
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elems["sgx.enabled"] = "true"
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}
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return elems
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}
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func sgxEnabled() bool {
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var epcSize uint64
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if cpuid.CPU.SGX.Available {
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for _, s := range cpuid.CPU.SGX.EPCSections {
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epcSize += s.EPCSize
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}
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}
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// Set to 'true' based a non-zero sum value of SGX EPC section sizes. The
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// kernel checks for IA32_FEATURE_CONTROL.SGX_ENABLE MSR bit but we can't
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// do that as a normal user. Typically the BIOS, when enabling SGX,
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// allocates "Processor Reserved Memory" for SGX EPC so we rely on > 0
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// size here to set "SGX = enabled".
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if epcSize > 0 {
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return true
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}
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return false
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}
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