Re: [PATCH v2 1/2] x86/tdx: Add helper to query maximum TD Quote size

[Binbin Wu]

On 7/18/2026 5:43 AM, Peter Fang wrote:
> TDX attestation report ("Quote") sizes can grow with newer cryptographic
> schemes, so guests can no longer rely on a fixed-size buffer for the
> Quote.
> 
> Newer TDX modules report the maximum Quote size via a TD-scope metadata
> field. Add a helper to query the size instead of exposing tdg_vm_rd()
> directly, as it can read arbitrary metadata fields.
> 
> Thanks to Xu Yilun for suggesting this in an off-list discussion.
> 
> Reviewed-by: Kiryl Shutsemau (Meta) <kas@xxxxxxxxxx>
> Reviewed-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
> Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
> Signed-off-by: Peter Fang <peter.fang@xxxxxxxxx>

Reviewed-by: Binbin Wu <binbin.wu@xxxxxxxxxxxxxxx>