linux-kernel - Re: [PATCH v3 12/16] x86/virt/tdx: Add helpers to allow for pre-allocating pages

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Message-ID: <e7edbc74046335294a69aae75e46ea925fa0d1b2.camel@intel.com>
Date: Fri, 26 Sep 2025 15:49:34 +0000
From: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To: "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "linux-coco@...ts.linux.dev"
	<linux-coco@...ts.linux.dev>, "Huang, Kai" <kai.huang@...el.com>, "Hansen,
 Dave" <dave.hansen@...el.com>, "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>, "tglx@...utronix.de" <tglx@...utronix.de>,
	"Yamahata, Isaku" <isaku.yamahata@...el.com>, "pbonzini@...hat.com"
	<pbonzini@...hat.com>, "Annapurve, Vishal" <vannapurve@...gle.com>, "Gao,
 Chao" <chao.gao@...el.com>, "bp@...en8.de" <bp@...en8.de>, "x86@...nel.org"
	<x86@...nel.org>
Subject: Re: [PATCH v3 12/16] x86/virt/tdx: Add helpers to allow for
 pre-allocating pages

On Fri, 2025-09-26 at 08:19 -0700, Dave Hansen wrote:
> On 9/18/25 16:22, Rick Edgecombe wrote:
> > +/*
> > + * Simple structure for pre-allocating Dynamic
> > + * PAMT pages outside of locks.
> > + */
> > +struct tdx_prealloc {
> > +	struct list_head page_list;
> > +	int cnt;
> > +};
> 
> This is compact and all. But it's really just an open-coded,
> simplified version of what mempool_t plus mempool_init_page_pool()
> would do.
> 
> Could you take a look at that and double check that it's not a good
> fit here, please?

Yes! I searched and was surprised there wasn't something like this. I
will give this one a try.