linux-kernel - Re: [PATCH v3 19/24] KVM: x86: Introduce per-VM external cache for splitting

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Message-ID: <8e025ab571eadb2a046e2dc1b53a92de6506ea01.camel@intel.com>
Date: Thu, 22 Jan 2026 07:30:16 +0000
From: "Huang, Kai" <kai.huang@...el.com>
To: "seanjc@...gle.com" <seanjc@...gle.com>, "Zhao, Yan Y"
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Subject: Re: [PATCH v3 19/24] KVM: x86: Introduce per-VM external cache for
 splitting

> > 
> > > Then we can define a structure which contains DPAMT pages for a given 2M
> > > range:
> > > 
> > > 	struct tdx_dmapt_metadata {
> > > 		struct page *page1;
> > > 		struct page *page2;
> > > 	};
> 
> Note: we need 4 pages to split a 2MB range, 2 for the new S-EPT page, 2 for the
> 2MB guest memory range.

In this proposal the pair for S-EPT is already handled by tdx_alloc_page()
(or tdx_alloc_control_page()):

  sp->external_spt = tdx_alloc_page();