linux-kernel - Re: [PATCH v4 04/16] x86/virt/tdx: Allocate page bitmap for Dynamic PAMT

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Message-ID: <4b75ddb133d35d133725ba270a9dfcb9acda38b4.camel@intel.com>
Date: Fri, 9 Jan 2026 16:05:30 +0000
From: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To: "yilun.xu@...ux.intel.com" <yilun.xu@...ux.intel.com>
CC: "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "linux-coco@...ts.linux.dev"
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	<bp@...en8.de>, "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH v4 04/16] x86/virt/tdx: Allocate page bitmap for Dynamic
 PAMT

On Fri, 2026-01-09 at 10:18 +0800, Xu Yilun wrote:
> On the other hand, the cost of a newly designed firmware interface
> for an already online functionality is not low, especially when you
> want backward compatibility to old TDX Module. The worst case is we
> keep both sets of the code...

I think TDX module changes are something to consider long term. We
already discussed not overhauling the metadata reading again ahead of
the current work, so I don't think there is anything else to discuss
here.