Re: [RFC PATCH 09/15] x86/virt/tdx: Add interface to generate a Quote

[Peter Fang]

On Thu, Jun 11, 2026 at 08:15:50PM +0300, Adrian Hunter wrote:
> On 22/05/2026 06:41, Xu Yilun wrote:
> > From: Peter Fang <peter.fang@xxxxxxxxx>
> > 
> > Use the TDX Quoting extension's TDH.QUOTE.GET SEAMCALL to generate a
> > Quote. Since the interface is shared across all KVM instances,
> > serialize access to the SEAMCALL buffer with a mutex.
> 
> Isn't the concurrency configurable, so supporting only 1 instance
> is a decision of the software implementation, not a TDX limitation?

Ah yes, I should document that. I'll put that in the patch log.

> 
> > +static u64 tdx_quote_get(struct tdx_td *td, u64 in_data_pa, u64 in_data_len,
> > +			 u64 hpa_list_pa, u64 total_len, u64 *quote_len)
> > +{
> > +	struct tdx_module_args args = {
> > +		.rcx = tdx_tdr_pa(td),
> > +		/* Don't bother specifying the quote id */
> 
> Need to explain why

Will do. It's because we use whatever the default Quote ID is.

> 
> ...
> 
> > +	r = tdx_quote_get(td, quote_data.hpa_list[0], (u64)in_data_len,
> > +			  quote_data.hpa_list_pa, quote_data.buf_len, &out_len);
> > +	if (r || !out_len || out_len > quote_data.buf_len)
> 
> Is r != TDX_SUCCESS more consistent

Yep I can fix that. Thanks.

>