Re: [PATCHv2 02/12] x86/virt/tdx: Allocate page bitmap for Dynamic PAMT

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To: "kirill.shutemov@xxxxxxxxxxxxxxx" <kirill.shutemov@xxxxxxxxxxxxxxx>, "pbonzini@xxxxxxxxxx" <pbonzini@xxxxxxxxxx>, "seanjc@xxxxxxxxxx" <seanjc@xxxxxxxxxx>, "dave.hansen@xxxxxxxxxxxxxxx" <dave.hansen@xxxxxxxxxxxxxxx>
Subject: Re: [PATCHv2 02/12] x86/virt/tdx: Allocate page bitmap for Dynamic PAMT
From: "Huang, Kai" <kai.huang@xxxxxxxxx>
Date: Thu, 26 Jun 2025 11:08:07 +0000
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Cc: "Gao, Chao" <chao.gao@xxxxxxxxx>, "Edgecombe, Rick P" <rick.p.edgecombe@xxxxxxxxx>, "bp@xxxxxxxxx" <bp@xxxxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, "mingo@xxxxxxxxxx" <mingo@xxxxxxxxxx>, "Zhao, Yan Y" <yan.y.zhao@xxxxxxxxx>, "tglx@xxxxxxxxxxxxx" <tglx@xxxxxxxxxxxxx>, "kvm@xxxxxxxxxxxxxxx" <kvm@xxxxxxxxxxxxxxx>, "linux-coco@xxxxxxxxxxxxxxx" <linux-coco@xxxxxxxxxxxxxxx>, "Yamahata, Isaku" <isaku.yamahata@xxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>
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On Mon, 2025-06-09 at 22:13 +0300, Kirill A. Shutemov wrote:
> With Dynamic PAMT, the kernel no longer needs to allocate PAMT_4K on
> boot, but instead must allocate a page bitmap. 

PAMTs are not allocated on boot, but when module gets initialized.

So perhaps:

"on boot" -> "when TDX module gets initialized"

Follow-Ups:
- Re: [PATCHv2 02/12] x86/virt/tdx: Allocate page bitmap for Dynamic PAMT
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References:
- [PATCHv2 00/12] TDX: Enable Dynamic PAMT
  - From: Kirill A. Shutemov
- [PATCHv2 02/12] x86/virt/tdx: Allocate page bitmap for Dynamic PAMT
  - From: Kirill A. Shutemov

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