Brijesh, On 10/07/2021 0:55, Brijesh Singh wrote: > 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@xxxxxxx/ > https://lore.kernel.org/kvm/20210707183616.5620-1-brijesh.singh@xxxxxxx/ > 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(-) > It might be useful to allow the user to view SNP-related status/settings in HMP's `info sev` and QMP's qom-list/qom-get under /machine/confidential-guest-support . (Not sure whether HMP is deprecated and new stuff should not be added there.) Particularly confusing is the `policy` attribute which is only relevant for SEV / SEV-ES, while there's a new `snp.policy` attribute for SNP... Maybe the irrelevant attributes should not be added to the tree when not in SNP. -Dov
