Re: [PATCH 10/25] KVM: TDX: Initialize KVM supported capabilities when module setup

[Tao Su]

On Mon, Aug 12, 2024 at 03:48:05PM -0700, Rick Edgecombe wrote:
> From: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
> 
> While TDX module reports a set of capabilities/features that it
> supports, what KVM currently supports might be a subset of them.
> E.g., DEBUG and PERFMON are supported by TDX module but currently not
> supported by KVM.
> 
> Introduce a new struct kvm_tdx_caps to store KVM's capabilities of TDX.
> supported_attrs and suppported_xfam are validated against fixed0/1
> values enumerated by TDX module. Configurable CPUID bits derive from TDX
> module plus applying KVM's capabilities (KVM_GET_SUPPORTED_CPUID),
> i.e., mask off the bits that are configurable in the view of TDX module
> but not supported by KVM yet.
> 

But this mask is not implemented in this patch, which should be in patch24?

> KVM_TDX_CPUID_NO_SUBLEAF is the concept from TDX module, switch it to 0
> and use KVM_CPUID_FLAG_SIGNIFCANT_INDEX, which are the concept of KVM.
> 
> Signed-off-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
> Signed-off-by: Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx>

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