Re: [PATCH v3 1/4] x86/tdx: Add helper to query maximum TD Quote size

[Peter Fang <peter.fang@intel.com>]

On Thu, Sep 03, 2026 at 09:04:31AM +0300, Tony Lindgren wrote:
> On Wed, Jul 29, 2026 at 05:29:31AM -0700, Peter Fang wrote:
> > +/**
> > + * tdx_get_max_quote_size() - Get the maximum TD Quote size
> > + *
> > + * Read the maximum size of a TD Quote from a 4-byte TD metadata field. The TDX
> > + * guest driver uses it to size the buffer for Quote retrieval. Older TDX
> > + * modules do not support this field and return an error.
> > + *
> > + * Return: Maximum Quote size in bytes on success, or 0 on failure.
> > + */
> > +u32 tdx_get_max_quote_size(void)
> > +{
> > +	u64 val, ret;
> > +
> > +	ret = tdg_vm_rd(TDCS_QUOTE_MAX_SIZE, &val);
> > +
> > +	return ret ? 0 : (u32)val;
> > +}
> 
> I think you can leave out the u32 cast above.
> 
> Other than that:
> 
> Reviewed-by: Tony Lindgren <tony.lindgren@linux.intel.com>

Thanks Tony! This was discussed previously [1] and Binbin pointed out
that this makes the field width more explicit:

[1] https://lore.kernel.org/all/20260714055421.GB3178326@pedri/