mirror of
https://github.com/aljazceru/kata-containers.git
synced 2026-01-14 03:44:25 +01:00
ded60173d4
This is based on a patch from @niteeshkd that adds a config parameter to choose between AMD SEV and SEV-SNP VMs as the confidential guest type in case both types are supported. SEV is the default. Signed-off-by: Joana Pecholt <joana.pecholt@aisec.fraunhofer.de>
47 lines
1.4 KiB
Go
47 lines
1.4 KiB
Go
// Copyright (c) 2021 Intel Corporation
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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package virtcontainers
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import "os"
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const (
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tdxSysFirmwareDir = "/sys/firmware/tdx_seam/"
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tdxCPUFlag = "tdx"
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sevKvmParameterPath = "/sys/module/kvm_amd/parameters/sev"
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snpKvmParameterPath = "/sys/module/kvm_amd/parameters/sev_snp"
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)
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// Implementation of this function is architecture specific
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func availableGuestProtection() (guestProtection, error) {
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flags, err := CPUFlags(procCPUInfo)
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if err != nil {
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return noneProtection, err
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}
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// TDX is supported and properly loaded when the firmware directory exists or `tdx` is part of the CPU flags
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if d, err := os.Stat(tdxSysFirmwareDir); (err == nil && d.IsDir()) || flags[tdxCPUFlag] {
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return tdxProtection, nil
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}
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// SEV-SNP is supported and enabled when the kvm module `sev_snp` parameter is set to `Y`
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// SEV-SNP support infers SEV (-ES) support
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if _, err := os.Stat(snpKvmParameterPath); err == nil {
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if c, err := os.ReadFile(snpKvmParameterPath); err == nil && len(c) > 0 && (c[0] == 'Y') {
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return snpProtection, nil
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}
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}
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// SEV is supported and enabled when the kvm module `sev` parameter is set to `1` (or `Y` for linux >= 5.12)
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if _, err := os.Stat(sevKvmParameterPath); err == nil {
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if c, err := os.ReadFile(sevKvmParameterPath); err == nil && len(c) > 0 && (c[0] == '1' || c[0] == 'Y') {
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return sevProtection, nil
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}
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}
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return noneProtection, nil
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}
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