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    SubjectRe: [PATCH v11 017/113] KVM: Support KVM_CAP_MAX_VCPUS for KVM_ENABLE_CAP
    Date
    On Mon, 2023-02-27 at 13:26 -0800, Isaku Yamahata wrote:
    > > > TDX attestation includes the maximum number of vcpu that the guest can
    > > > accommodate.  
    > > >
    > >
    > > I don't understand why "attestation" is the reason here.  Let's say TDX is
    > > used
    > > w/o attestation, I don't think this patch can be discarded?
    > >
    > > IMHO the true reason is TDX has it's own control of maximum number of vcpus,
    > > i.e. asking you to specify the value when creating the TD.  Therefore, the
    > > constant KVM_MAX_VCPUS doesn't work for TDX guest anymore.
    >
    > Without TDX attestation, this can be discarded.  The TD is created with
    > max_vcpus=KVM_MAX_VCPUS by default.

    This parses like: 

    If we have attestation, the TD can be created with a user-specified non-default
    value. Otherwise, the TD is always created with default value.

    It doesn't make sense, right?

    Because architecturally whether TD can be created with a user specified value
    doesn't depend on attestation at all.
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