linux-kernel - Re: [PATCHv2 07/12] KVM: TDX: Preallocate PAMT pages to be used in page fault path

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Message-ID: <a23aea4cc9b64f16bca1a70f299e766936db589d.camel@intel.com>
Date: Thu, 26 Jun 2025 11:21:52 +0000
From: "Huang, Kai" <kai.huang@...el.com>
To: "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
	"pbonzini@...hat.com" <pbonzini@...hat.com>, "seanjc@...gle.com"
	<seanjc@...gle.com>, "dave.hansen@...ux.intel.com"
	<dave.hansen@...ux.intel.com>
CC: "Gao, Chao" <chao.gao@...el.com>, "Edgecombe, Rick P"
	<rick.p.edgecombe@...el.com>, "bp@...en8.de" <bp@...en8.de>, "x86@...nel.org"
	<x86@...nel.org>, "mingo@...hat.com" <mingo@...hat.com>, "Zhao, Yan Y"
	<yan.y.zhao@...el.com>, "tglx@...utronix.de" <tglx@...utronix.de>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>, "linux-coco@...ts.linux.dev"
	<linux-coco@...ts.linux.dev>, "Yamahata, Isaku" <isaku.yamahata@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2 07/12] KVM: TDX: Preallocate PAMT pages to be used in
 page fault path

On Mon, 2025-06-09 at 22:13 +0300, Kirill A. Shutemov wrote:
> Preallocate a page to be used in the link_external_spt() and
> set_external_spte() paths.

"a page" -> "required PAMT pages"?

> 
> In the worst-case scenario, handling a page fault might require a
> tdx_nr_pamt_pages() pages for each page table level.

"a tdx_nr_pamt_pages() pages" -> "tdx_nr_pamt_pages() pages".