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

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Message-ID: <2947ba8d-cb5a-4db4-9c41-8ff60571e9e3@intel.com>
Date: Thu, 29 Aug 2024 21:28:14 +0800
From: Xiaoyao Li <xiaoyao.li@...el.com>
To: Tao Su <tao1.su@...ux.intel.com>,
 Rick Edgecombe <rick.p.edgecombe@...el.com>
Cc: seanjc@...gle.com, pbonzini@...hat.com, kvm@...r.kernel.org,
 kai.huang@...el.com, isaku.yamahata@...il.com,
 tony.lindgren@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/25] KVM: TDX: Initialize KVM supported capabilities
 when module setup

On 8/19/2024 9:33 AM, Tao Su wrote:
> On Mon, Aug 12, 2024 at 03:48:05PM -0700, Rick Edgecombe wrote:
>> From: Xiaoyao Li <xiaoyao.li@...el.com>
>>
>> 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?

yes, the commit message needs to be updated. Even more the patches need 
to be re-organized.

>> 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@...el.com>
>> Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
> 
> [...]