linux-kernel - Re: [PATCH v12 12/22] x86/virt/tdx: Allocate and set up PAMTs for TDMRs

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Date:   Tue, 11 Jul 2023 11:49:38 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "david@...hat.com" <david@...hat.com>
CC:     "Raj, Ashok" <ashok.raj@...el.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "bagasdotme@...il.com" <bagasdotme@...il.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "Chatre, Reinette" <reinette.chatre@...el.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "Yamahata, Isaku" <isaku.yamahata@...el.com>,
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        "hpa@...or.com" <hpa@...or.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "Shahar, Sagi" <sagis@...gle.com>,
        "imammedo@...hat.com" <imammedo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>, "Gao, Chao" <chao.gao@...el.com>,
        "Brown, Len" <len.brown@...el.com>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH v12 12/22] x86/virt/tdx: Allocate and set up PAMTs for
 TDMRs

On Tue, 2023-07-11 at 13:42 +0200, David Hildenbrand wrote:
> > -		ret = add_tdx_memblock(tmb_list, start_pfn, end_pfn);
> > +		ret = add_tdx_memblock(tmb_list, start_pfn, end_pfn, nid);
> >    		if (ret)
> >    			goto err;
> 
> Why did you decide to defer remembering the nid as well? I'd just move 
> that part to the patch that adds add_tdx_memblock().

Thanks for the review.

The @nid is used to try to allocate the PAMT from local node.  It only gets used
in this patch.  Originally (in v7) I had it in patch 09 but Dave suggested to
move to this patch (see the first comment in below link):

https://lore.kernel.org/lkml/8e6803f5-bec6-843d-f3c4-75006ffd0d2f@intel.com/