linux-kernel - Re: [RFC PATCH v2 04/23] KVM: TDX: Introduce tdx_clear

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Message-ID: <aLj/DLzikcN3tUbk@yzhao56-desk.sh.intel.com>
Date: Thu, 4 Sep 2025 10:53:00 +0800
From: Yan Zhao <yan.y.zhao@...el.com>
To: Binbin Wu <binbin.wu@...ux.intel.com>
CC: <pbonzini@...hat.com>, <seanjc@...gle.com>,
	<linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>, <x86@...nel.org>,
	<rick.p.edgecombe@...el.com>, <dave.hansen@...el.com>, <kas@...nel.org>,
	<tabba@...gle.com>, <ackerleytng@...gle.com>, <quic_eberman@...cinc.com>,
	<michael.roth@....com>, <david@...hat.com>, <vannapurve@...gle.com>,
	<vbabka@...e.cz>, <thomas.lendacky@....com>, <pgonda@...gle.com>,
	<fan.du@...el.com>, <jun.miao@...el.com>, <ira.weiny@...el.com>,
	<isaku.yamahata@...el.com>, <xiaoyao.li@...el.com>, <chao.p.peng@...el.com>
Subject: Re: [RFC PATCH v2 04/23] KVM: TDX: Introduce tdx_clear_folio() to
 clear huge pages

On Wed, Sep 03, 2025 at 07:19:32PM +0800, Binbin Wu wrote:
> 
> 
> On 9/3/2025 5:51 PM, Yan Zhao wrote:
> > On Tue, Sep 02, 2025 at 10:56:25AM +0800, Binbin Wu wrote:
> > > 
> > > On 8/7/2025 5:42 PM, Yan Zhao wrote:
> > > > After removing or reclaiming a guest private page or a control page from a
> > > > TD, zero the physical page using movdir64b(), enabling the kernel to reuse
> > > > the pages.
> > > > 
> > > > Introduce the function tdx_clear_folio() to zero out physical memory using
> > > > movdir64b(), starting from the page at "start_idx" within a "folio" and
> > > > spanning "npages" contiguous PFNs.
> > > > 
> > > > Convert tdx_clear_page() to be a helper function to facilitate the
> > > > zeroing of 4KB pages.
> > > I think this sentence is outdated?
> > No? tdx_clear_page() is still invoked to clear tdr_page.
> 
> I didn't get the word "Convert".
Ok. I wanted to express that tdx_clear_page() now is just a helper.
Will rephrase it to

"Make tdx_clear_page() to be a helper function to facilitate the zeroing
of 4KB pages".