diff options
Diffstat (limited to 'Documentation/arch/x86/amd-memory-encryption.rst')
| -rw-r--r-- | Documentation/arch/x86/amd-memory-encryption.rst | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/Documentation/arch/x86/amd-memory-encryption.rst b/Documentation/arch/x86/amd-memory-encryption.rst index 414bc7402ae7..6df3264f23b9 100644 --- a/Documentation/arch/x86/amd-memory-encryption.rst +++ b/Documentation/arch/x86/amd-memory-encryption.rst @@ -130,4 +130,31 @@ SNP feature support. More details in AMD64 APM[1] Vol 2: 15.34.10 SEV_STATUS MSR -[1] https://www.amd.com/content/dam/amd/en/documents/processor-tech-docs/programmer-references/24593.pdf +Secure VM Service Module (SVSM) +=============================== +SNP provides a feature called Virtual Machine Privilege Levels (VMPL) which +defines four privilege levels at which guest software can run. The most +privileged level is 0 and numerically higher numbers have lesser privileges. +More details in the AMD64 APM Vol 2, section "15.35.7 Virtual Machine +Privilege Levels", docID: 24593. + +When using that feature, different services can run at different protection +levels, apart from the guest OS but still within the secure SNP environment. +They can provide services to the guest, like a vTPM, for example. + +When a guest is not running at VMPL0, it needs to communicate with the software +running at VMPL0 to perform privileged operations or to interact with secure +services. An example fur such a privileged operation is PVALIDATE which is +*required* to be executed at VMPL0. + +In this scenario, the software running at VMPL0 is usually called a Secure VM +Service Module (SVSM). Discovery of an SVSM and the API used to communicate +with it is documented in "Secure VM Service Module for SEV-SNP Guests", docID: +58019. + +(Latest versions of the above-mentioned documents can be found by using +a search engine like duckduckgo.com and typing in: + + site:amd.com "Secure VM Service Module for SEV-SNP Guests", docID: 58019 + +for example.) |