linux-kernel - Re: [RFC PATCH 08/21] KVM: TDX: Increase/decrease folio ref for huge pages

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Message-ID: <447bae3b7f5f2439b0cb4eb77976d9be843f689b.camel@intel.com>
Date: Wed, 25 Jun 2025 23:19:36 +0000
From: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To: "ackerleytng@...gle.com" <ackerleytng@...gle.com>, "Zhao, Yan Y"
	<yan.y.zhao@...el.com>
CC: "quic_eberman@...cinc.com" <quic_eberman@...cinc.com>, "Li, Xiaoyao"
	<xiaoyao.li@...el.com>, "Du, Fan" <fan.du@...el.com>, "Hansen, Dave"
	<dave.hansen@...el.com>, "david@...hat.com" <david@...hat.com>,
	"thomas.lendacky@....com" <thomas.lendacky@....com>, "tabba@...gle.com"
	<tabba@...gle.com>, "vbabka@...e.cz" <vbabka@...e.cz>, "Shutemov, Kirill"
	<kirill.shutemov@...el.com>, "michael.roth@....com" <michael.roth@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"seanjc@...gle.com" <seanjc@...gle.com>, "Peng, Chao P"
	<chao.p.peng@...el.com>, "pbonzini@...hat.com" <pbonzini@...hat.com>,
	"Yamahata, Isaku" <isaku.yamahata@...el.com>, "binbin.wu@...ux.intel.com"
	<binbin.wu@...ux.intel.com>, "Weiny, Ira" <ira.weiny@...el.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>, "Annapurve, Vishal"
	<vannapurve@...gle.com>, "jroedel@...e.de" <jroedel@...e.de>, "Miao, Jun"
	<jun.miao@...el.com>, "Li, Zhiquan1" <zhiquan1.li@...el.com>,
	"pgonda@...gle.com" <pgonda@...gle.com>, "x86@...nel.org" <x86@...nel.org>
Subject: Re: [RFC PATCH 08/21] KVM: TDX: Increase/decrease folio ref for huge
 pages

On Wed, 2025-06-25 at 16:09 -0700, Ackerley Tng wrote:
> > I do think that these threads have gone on far too long. It's probably about
> > time to move forward with something even if it's just to have something to
> > discuss that doesn't require footnoting so many lore links. So how about we
> > move
> > forward with option e as a next step. Does that sound good Yan?
> > 
> 
> Please see my reply to Yan, I'm hoping y'all will agree to something
> between option f/g instead.

I'm not sure about the HWPoison approach, but I'm not totally against it. My
bias is that all the MM concepts are tightly interlinked. If may fit perfectly,
but every new use needs to be checked for how fits in with the other MM users of
it. Every time I've decided a page flag was the perfect solution to my problem,
I got informed otherwise. Let me try to flag Kirill to this discussion. He might
have some insights.