mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2024-12-14 11:57:51 +00:00
a00cdc2b61
Refactor the code, moving the hostpath helper functionality to new "pkg/utils/hostpath" package. This breaks odd-ish dependency "pkg/utils" -> "source".
75 lines
1.8 KiB
Go
75 lines
1.8 KiB
Go
//go:build amd64
|
|
// +build amd64
|
|
|
|
/*
|
|
Copyright 2021 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package cpu
|
|
|
|
import (
|
|
"os"
|
|
|
|
"github.com/klauspost/cpuid/v2"
|
|
|
|
"sigs.k8s.io/node-feature-discovery/pkg/utils/hostpath"
|
|
)
|
|
|
|
func discoverSecurity() map[string]string {
|
|
elems := make(map[string]string)
|
|
|
|
if sgxEnabled() {
|
|
elems["sgx.enabled"] = "true"
|
|
}
|
|
|
|
if tdxEnabled() {
|
|
elems["tdx.enabled"] = "true"
|
|
}
|
|
|
|
return elems
|
|
}
|
|
|
|
func sgxEnabled() bool {
|
|
var epcSize uint64
|
|
if cpuid.CPU.SGX.Available {
|
|
for _, s := range cpuid.CPU.SGX.EPCSections {
|
|
epcSize += s.EPCSize
|
|
}
|
|
}
|
|
|
|
// Set to 'true' based a non-zero sum value of SGX EPC section sizes. The
|
|
// kernel checks for IA32_FEATURE_CONTROL.SGX_ENABLE MSR bit but we can't
|
|
// do that as a normal user. Typically the BIOS, when enabling SGX,
|
|
// allocates "Processor Reserved Memory" for SGX EPC so we rely on > 0
|
|
// size here to set "SGX = enabled".
|
|
if epcSize > 0 {
|
|
return true
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
func tdxEnabled() bool {
|
|
// If /sys/module/kvm_intel/parameters/tdx is not present, or is present
|
|
// with a value different than "Y\n" assume TDX to be unavailable or
|
|
// disabled.
|
|
protVirtHost := hostpath.SysfsDir.Path("module/kvm_intel/parameters/tdx")
|
|
if content, err := os.ReadFile(protVirtHost); err == nil {
|
|
if string(content) == "Y\n" {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|