linux-kernel - Re: [PATCH v3 07/16] x86/virt/tdx: Add tdx_alloc/free

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Message-ID: <348ae3abccbead93119ddf9451ef26292634f977.camel@intel.com>
Date: Mon, 22 Sep 2025 11:27:25 +0000
From: "Huang, Kai" <kai.huang@...el.com>
To: "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "linux-coco@...ts.linux.dev"
	<linux-coco@...ts.linux.dev>, "Zhao, Yan Y" <yan.y.zhao@...el.com>,
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>, "kas@...nel.org"
	<kas@...nel.org>, "seanjc@...gle.com" <seanjc@...gle.com>, "mingo@...hat.com"
	<mingo@...hat.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "pbonzini@...hat.com" <pbonzini@...hat.com>,
	"Yamahata, Isaku" <isaku.yamahata@...el.com>, "tglx@...utronix.de"
	<tglx@...utronix.de>, "Annapurve, Vishal" <vannapurve@...gle.com>, "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>
CC: "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH v3 07/16] x86/virt/tdx: Add tdx_alloc/free_page() helpers

On Thu, 2025-09-18 at 16:22 -0700, Edgecombe, Rick P wrote:
> +static void free_pamt_array(u64 *pa_array)
> +{
> +	for (int i = 0; i < tdx_dpamt_entry_pages(); i++) {
> +		if (!pa_array[i])
> +			break;
> +
> +		reset_tdx_pages(pa_array[i], PAGE_SIZE);

This needs rebasing I suppose.

> +
> +		/*
> +		 * It might have come from 'prealloc', but this is an error
> +		 * path. Don't be fancy, just free them. TDH.PHYMEM.PAMT.ADD
> +		 * only modifies RAX, so the encoded array is still in place.
> +		 */
> +		__free_page(phys_to_page(pa_array[i]));
> 

This comment shouldn't be in this patch?  The 'prealloc' concept doesn't
exist yet until patch 12 AFAICT.