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What SEV-ES protects
Secure Encrypted Virtualization (SEV) is AMD’s confidential-VM technology for AMD-V. SEV assigns a unique encryption key to each VM’s memory. SEV-ES extends that protection to CPU register contents during VM stops and transitions to the hypervisor, reducing what a privileged host component can inspect in that state.
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AMD’s current SEV developer portal summarizes the feature this way: “SEV-ES encrypts all CPU register contents when a VM stops running.” AMD’s feature-specific white paper, Protecting VM Register State with SEV-ES (document 70364, released February 17, 2017), explains that guest VMs can control which pieces of state the hypervisor can view.
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The features build on one another, but their security guarantees are not interchangeable. AMD’s SEV-SNP white paper (document 70366, released January 1, 2020) describes the progression from SEV to SEV-ES and then to SNP’s stronger memory-integrity protections.
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| Protection | SEV | SEV-ES | SEV-SNP |
|---|---|---|---|
| Guest memory confidentiality | Yes; VM-specific key | Yes; inherited from SEV | Yes; inherited |
| CPU register-state confidentiality | Limited in base SEV | Added for VM stops and world switches | Inherited and extended |
| Memory integrity and anti-remapping | Not the defining guarantee | Not the defining guarantee | Adds RMP-based integrity and validation |
| Generation mapping in the AMDSEV feature matrix | EPYC 7001 | EPYC 7002 | EPYC 7003 and later enhancements |
In practical terms, SEV-ES addresses exposure of CPU state at the hypervisor boundary. It does not by itself provide SEV-SNP’s memory-remapping and replay-style attack defenses. A system described as SEV-ES capable should not be assumed to support SNP, or vice versa, without checking its exact processor and platform support.
Which AMD processors support SEV-ES?
The AMDSEV project’s maintained feature matrix maps “SEV 2.0 (ES – Encrypted State)” to EPYC 7002, codenamed Rome. That makes EPYC 7002 the key generation to check when assessing SEV-ES hardware. The generation mapping is a starting point, not a guarantee that every server configuration is ready to run confidential guests.
Deployment also depends on a compatible motherboard and BIOS or firmware, AMD Secure Processor firmware, and support across the guest, hypervisor, and QEMU/KVM stack. Verify the exact processor SKU and firmware combination with the platform vendor and AMD documentation; the processor family alone does not establish that a particular server has the required capability enabled.
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How SEV-ES works with KVM
Linux KVM exposes SEV operations through the KVM_SEV interface. The interface supports guest launch and status, secret injection, attestation, and encrypted send/receive operations used for migration. AMD Secure Processor firmware handles key-management operations involved in encryption, snapshots, migration, and debugging workflows.
For a KVM deployment, treat setup as a platform-validation sequence rather than a single switch. Linux’s KVM documentation describes the API operations, but the available controls and requirements depend on the kernel, QEMU, firmware, and platform integration in use.
- Confirm platform capability. Check the processor generation and exact SKU, then verify BIOS/firmware settings and AMD Secure Processor firmware support with the server vendor.
- Check the full software stack. Confirm that the host kernel’s KVM implementation, QEMU integration, and guest support the required SEV-ES operations. Use the documentation for the versions deployed; a supported CPU does not establish software compatibility.
- Launch with the intended guest policy and measurement. Configure the guest launch flow for the platform’s SEV-ES policy and measure the guest state. Do not release sensitive data merely because launch completed.
- Validate attestation before releasing secrets. KVM’s
KVM_SEV_GET_ATTESTATION_REPORToperation retrieves a report containing a SHA-256 digest of guest memory and the VMSA passed through launch commands, signed with the platform endorsement key. Verify the report against the expected launch state and the trust requirements of the deployment before injecting secrets. - Test lifecycle operations. KVM’s
KVM_SEV_GUEST_STATUSreports the guest handle, policy, and state. Exercise secret injection and, if needed, encrypted migration using the relevant send/receive operations, including recovery behavior for the chosen platform.
The kernel API documents capabilities and operations; it does not make every server’s firmware and user-space stack interchangeable. Follow the platform vendor’s deployment guidance and confirm the behavior of the actual kernel, QEMU, firmware, and guest combination in use.
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Security boundaries and performance
SEV-ES is designed to limit a hypervisor or other privileged host component’s ability to inspect or alter guest CPU register state at VM transitions. It is not a promise that every host attack is impossible. Confidentiality, integrity, attestation, firmware trust, and side-channel assumptions are separate parts of a threat model; SEV-ES alone should not be described as providing SNP’s memory-integrity guarantees.
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No universal SEV-ES performance-overhead figure is established by the cited AMD and Linux materials. Workload, processor generation, firmware, hypervisor, and use of launch, migration, debugging, or attestation operations can all affect performance, so a deployment should be measured on its intended configuration.
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