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ab978c62e7
Pull base x86 KVM support for running SEV-SNP guests from Michael Roth: * add some basic infrastructure and introduces a new KVM_X86_SNP_VM vm_type to handle differences versus the existing KVM_X86_SEV_VM and KVM_X86_SEV_ES_VM types. * implement the KVM API to handle the creation of a cryptographic launch context, encrypt/measure the initial image into guest memory, and finalize it before launching it. * implement handling for various guest-generated events such as page state changes, onlining of additional vCPUs, etc. * implement the gmem/mmu hooks needed to prepare gmem-allocated pages before mapping them into guest private memory ranges as well as cleaning them up prior to returning them to the host for use as normal memory. Because those cleanup hooks supplant certain activities like issuing WBINVDs during KVM MMU invalidations, avoid duplicating that work to avoid unecessary overhead. This merge leaves out support support for attestation guest requests and for loading the signing keys to be used for attestation requests. |
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