* Dov Murik (dovmurik@xxxxxxxxxxxxx) wrote: > 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.) It's still fine to add stuff to HMP, although generally you should be adding it to QMP as well (unles sit's purely for debug and may change). Dave > 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 > -- Dr. David Alan Gilbert / dgilbert@xxxxxxxxxx / Manchester, UK
