mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
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d5db1cf907
Set `cpu-security.tdx.enable` to `true` when TDX is avialable and has been enabled. otherwise it'll be set to `false`. `/sys/module/kvm_intel/parameters/tdx` presence and content is used to detect whether a CPU is Intel TDX capable. Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>
74 lines
1.8 KiB
Go
74 lines
1.8 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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"os"
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"github.com/klauspost/cpuid/v2"
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"sigs.k8s.io/node-feature-discovery/source"
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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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if tdxEnabled() {
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elems["tdx.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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func tdxEnabled() bool {
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// If /sys/module/kvm_intel/parameters/tdx is not present, or is present
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// with a value different than "Y\n" assume TDX to be unavailable or
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// disabled.
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protVirtHost := source.SysfsDir.Path("module/kvm_intel/parameters/tdx")
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if content, err := os.ReadFile(protVirtHost); err == nil {
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if string(content) == "Y\n" {
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return true
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}
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}
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return false
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}
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