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    SubjectRe: [RFC FATCH] x86/Hyper-V: Add SEV negotiate protocol support in Isolation VM.
    Nits:

    > Hyper-V Isolation VM code uses sev_es_ghcb_hv_call() to read/write MSR
    > via ghcb page. The SEV-ES guest should call the sev_es_negotiate_protocol()

    ghcb page -> GHCB page

    call the sev_es_negotiate_protocol() -> call sev_es_negotiate_protocol()
    (or -- call the sev_es_negotiate_protocol() function)

    > to negotiate the GHCB protocol version before establishing the GHCB. Call
    > sev_es_negotiate_protocol() in the hyperv_init_ghcb().

    in the hyperv_init_ghcb() -> in hyperv_init_ghcb()

    (similarly elsewhere).

    Andrea

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