Re: [PATCH v2 24/31] coco/tdx-host: Add a helper to exchange SPDM messages through DOE

[Xu Yilun <yilun.xu@linux.intel.com>]

On Thu, Apr 09, 2026 at 07:56:06AM +0000, Tian, Kevin wrote:
> > From: Xu Yilun <yilun.xu@linux.intel.com>
> > Sent: Saturday, March 28, 2026 12:01 AM
> > +
> > +static int __maybe_unused tdx_spdm_msg_exchange(struct tdx_tsm_link
> > *tlink,
> > +						void *request, size_t
> > request_sz,
> > +						void *response, size_t
> > response_sz)
> > +{
> > +	struct pci_dev *pdev = tlink->pci.base_tsm.pdev;
> 
> call it pci_spdm_msg_exchange() and pass in struct pci_dev directly.

I don't think so. There is kernel managed spdm transfer support WIP,
which is another topic.  We don't want to mix the namespace with that
one.

And we also don't name it tsm_spdm_msg_exchange, cause TSM firmwares
output different blobs for vendor TSM drivers to transfer. E.g. TDX
Module outputs buffers with DOE header & SPDM header, other vendors
(AMD IIRC) outputs buffers with only SPDM header. So this function is
TDX specific.

> 
> there is no other use of tlink in this function. could add a note that
> this should be moved to pci core when a 2nd user of raw frame comes.