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DICE enables layered > and extensible attestation, where evidence is accumulated across > multiple boot stages. > > With SGX-based attestation, Quote sizes are typically under 8KB, as the > payload consists primarily of Quote data and a small certificate bundle. > Existing TDX guest code sizes the Quote buffer accordingly. > > DICE-based attestation produces significantly larger Quotes due to the > inclusion of evidence (certificate chains) from multiple boot layers. > The cumulative Quote size can reach approximately 100KB. > > Increase GET_QUOTE_BUF_SIZE to 128KB to ensure sufficient buffer > capacity for DICE-based Quote payloads. > > Reviewed-by: Fang Peter > Signed-off-by: Kuppuswamy Sathyanarayanan > --- > Documentation/ABI/testing/configfs-tsm-report | 4 ++++ > drivers/virt/coco/tdx-guest/tdx-guest.c | 4 +++- > 2 files changed, 7 insertions(+), 1 deletion(-) > > diff --git a/Documentation/ABI/testing/configfs-tsm-report b/Documentation/ABI/testing/configfs-tsm-report > index ca3352cfd2f1..7a6a5045a7d5 100644 > --- a/Documentation/ABI/testing/configfs-tsm-report > +++ b/Documentation/ABI/testing/configfs-tsm-report > @@ -73,6 +73,10 @@ Description: > Library Revision 0.8 Appendix 4,5 > https://download.01.org/intel-sgx/latest/dcap-latest/linux/docs/Intel_TDX_DCAP_Quoting_Library_API.pdf > > + Intel TDX platforms with DICE-based attestation use CBOR Web Token > + (CWT) format for the Quote payload. This is indicated by the Quote > + size exceeding 8KB. Looks ok, please follow up with a link to the full format specification when it is published. I will change this subject to: "configfs-tsm-report: tdx_guest: Increase Quote buffer size to 128KB"