linux-kernel - Re: [RFC PATCH v2 03/23] x86/tdx: Enhance tdh_phymem_page_wbinvd

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Message-ID: <01731a9a0346b08577fad75ae560c650145c7f39.camel@intel.com>
Date: Thu, 13 Nov 2025 07:37:29 +0000
From: "Huang, Kai" <kai.huang@...el.com>
To: "Zhao, Yan Y" <yan.y.zhao@...el.com>
CC: "Du, Fan" <fan.du@...el.com>, "Li, Xiaoyao" <xiaoyao.li@...el.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>, "Hansen, Dave"
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Subject: Re: [RFC PATCH v2 03/23] x86/tdx: Enhance
 tdh_phymem_page_wbinvd_hkid() to invalidate huge pages


Thanks for all the explanation.

[...]


> In [6], the new folio_page() implementation is
> 
> static inline struct page *folio_page(struct folio *folio, unsigned long n)
> {
> 	return &folio->page + n;
> }
> 
> So, invoking folio_page() should be equal to page++ in our case.
> 
> [6] https://lore.kernel.org/kvm/20250901150359.867252-13-david@redhat.com

Sure.  But it seems you will need to wait all patches that you mentioned to
be merged to safely use 'page++' for pages in a folio?

And if you do:

	for (i = 0; i < npages; i++)
	{
		struct page *p = folio_page(folio, start_idx + i);
		struct tdx_module_args args = {};

		args.rcx = mk_keyed_paddr(hkid, p);
		...
	}

It should work w/o any dependency?

Anyway, I don't have any strong opinion, as long as it works.  You may
choose what you want. :-)