[Feature]: Enable MLA prefill-only operator
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@galagam is already working on this.
Since Jan 7, 2026.
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Description
🚀 The feature, motivation and pitch
FlashInfer MLA MHA-mode (no weight absorption) with cache; ragged; for prefill-only. Uses flashinfer.BatchPrefillWithRaggedKVCacheWrapper
This kernel is optimized for prefill.
Its inputs are full heads Q/K/V so it performs MLA in MHA-mode (no absorption).
The operator should compute ckv and kpe and write them to the compressed cache, then continue to do MHA.
This can probably done with other flashinfer kernels.
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