Re: [RFC v2 4/5] tpm: Increase TPM_BUFSIZE to 8kB for chunking support

[Jarkko Sakkinen]

On Tue, Mar 24, 2026 at 11:42:43PM +0530, Arun Menon wrote:
> The size of the command is checked against TPM_BUFSIZE early on before
> even sending it to the backend. We therefore need to increase the
> TPM_BUFSIZE to allow support for larger commands.
> 
> For now, 8KB seems sufficient for ML-KEM and ML-DSA algorithms and it is
> also order-1 safe.
> 
> Signed-off-by: Arun Menon <armenon@xxxxxxxxxx>
> ---
>  drivers/char/tpm/tpm.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index 87d68ddf270a7..26c3765fbd732 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -33,7 +33,7 @@
>  #endif
>  
>  #define TPM_MINOR		224	/* officially assigned */
> -#define TPM_BUFSIZE		4096
> +#define TPM_BUFSIZE		8192
>  #define TPM_NUM_DEVICES		65536
>  #define TPM_RETRY		50
>  
> -- 
> 2.53.0
> 

Shouldn't this prepend previous patch?

BR, Jarkko