[RFC PATCH 0/6] Add AMD Secure Nested Paging (SEV-SNP) support

[Brijesh Singh]

SEV-SNP builds upon existing SEV and SEV-ES functionality while adding
new hardware-based memory protections. SEV-SNP adds strong memory integrity
protection to help prevent malicious hypervisor-based attacks like data
replay, memory re-mapping and more in order to create an isolated memory
encryption environment.

The patches to support the SEV-SNP in Linux kernel and OVMF are available:
https://lore.kernel.org/kvm/20210707181506.30489-1-brijesh.singh@amd.com/
https://lore.kernel.org/kvm/20210707183616.5620-1-brijesh.singh@amd.com/
https://edk2.groups.io/g/devel/message/77335?p=,,,20,0,0,0::Created,,posterid%3A5969970,20,2,20,83891508

The Qemu patches uses the command id added by the SEV-SNP hypervisor
patches to bootstrap the SEV-SNP VMs.

TODO:
 * Add support to filter CPUID values through the PSP.

Additional resources
---------------------
SEV-SNP whitepaper
https://www.amd.com/system/files/TechDocs/SEV-SNP-strengthening-vm-isolation-with-integrity-protection-and-more.pdf

APM 2: https://www.amd.com/system/files/TechDocs/24593.pdf (section 15.36)

GHCB spec:
https://developer.amd.com/wp-content/resources/56421.pdf

SEV-SNP firmware specification:
https://www.amd.com/system/files/TechDocs/56860.pdf

Brijesh Singh (6):
  linux-header: add the SNP specific command
  i386/sev: extend sev-guest property to include SEV-SNP
  i386/sev: initialize SNP context
  i386/sev: add the SNP launch start context
  i386/sev: add support to encrypt BIOS when SEV-SNP is enabled
  i386/sev: populate secrets and cpuid page and finalize the SNP launch

 docs/amd-memory-encryption.txt |  81 +++++-
 linux-headers/linux/kvm.h      |  47 ++++
 qapi/qom.json                  |   6 +
 target/i386/sev.c              | 498 ++++++++++++++++++++++++++++++++-
 target/i386/sev_i386.h         |   1 +
 target/i386/trace-events       |   4 +
 6 files changed, 628 insertions(+), 9 deletions(-)

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2.17.1