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

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Message-ID: <aa397b84e283d959cfef061ff1cf571dc39fede9.camel@intel.com>
Date: Tue, 1 Jul 2025 14:15:32 +0000
From: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To: "Annapurve, Vishal" <vannapurve@...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>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "Hansen,
 Dave" <dave.hansen@...el.com>, "david@...hat.com" <david@...hat.com>,
	"thomas.lendacky@....com" <thomas.lendacky@....com>, "vbabka@...e.cz"
	<vbabka@...e.cz>, "tabba@...gle.com" <tabba@...gle.com>, "Shutemov, Kirill"
	<kirill.shutemov@...el.com>, "michael.roth@....com" <michael.roth@....com>,
	"binbin.wu@...ux.intel.com" <binbin.wu@...ux.intel.com>, "seanjc@...gle.com"
	<seanjc@...gle.com>, "Peng, Chao P" <chao.p.peng@...el.com>, "Du, Fan"
	<fan.du@...el.com>, "Yamahata, Isaku" <isaku.yamahata@...el.com>,
	"ackerleytng@...gle.com" <ackerleytng@...gle.com>, "Weiny, Ira"
	<ira.weiny@...el.com>, "pbonzini@...hat.com" <pbonzini@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"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 Tue, 2025-07-01 at 00:13 -0700, Vishal Annapurve wrote:
> > Not sure. As Kirill said "TDX module has creative ways to corrupt it"
> > https://lore.kernel.org/all/zlxgzuoqwrbuf54wfqycnuxzxz2yduqtsjinr5uq4ss7iuk2rt@qaaolzwsy6ki/
> > .
> 
> I would assume that would be true only if TDX module logic is allowed
> to execute. Otherwise it would be useful to understand these
> "creative" ways better.

The no more seamcalls = no more corruptions is what the host kexec patches are
based on.