linux-kernel - Re: [PATCH v3 14/24] KVM: Change the return type of gfn_handler

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Message-ID: <aWnc8hn9yyK/2i7M@yzhao56-desk.sh.intel.com>
Date: Fri, 16 Jan 2026 14:42:57 +0800
From: Yan Zhao <yan.y.zhao@...el.com>
To: Sean Christopherson <seanjc@...gle.com>
CC: <pbonzini@...hat.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>, <michael.roth@....com>, <david@...nel.org>,
	<vannapurve@...gle.com>, <sagis@...gle.com>, <vbabka@...e.cz>,
	<thomas.lendacky@....com>, <nik.borisov@...e.com>, <pgonda@...gle.com>,
	<fan.du@...el.com>, <jun.miao@...el.com>, <francescolavra.fl@...il.com>,
	<jgross@...e.com>, <ira.weiny@...el.com>, <isaku.yamahata@...el.com>,
	<xiaoyao.li@...el.com>, <kai.huang@...el.com>, <binbin.wu@...ux.intel.com>,
	<chao.p.peng@...el.com>, <chao.gao@...el.com>
Subject: Re: [PATCH v3 14/24] KVM: Change the return type of gfn_handler_t()
 from bool to int

On Thu, Jan 15, 2026 at 04:21:14PM -0800, Sean Christopherson wrote:
> On Tue, Jan 06, 2026, Yan Zhao wrote:
> > Modify the return type of gfn_handler_t() from bool to int. A negative
> > return value indicates failure, while a return value of 1 signifies success
> > with a flush required, and 0 denotes success without a flush required.
> > 
> > This adjustment prepares for a later change that will enable
> > kvm_pre_set_memory_attributes() to fail.
> 
> No, just don't support S-EPT hugepages with per-VM memory attributes.  This type
> of complexity isn't worth carrying for a feature we want to deprecate.
Got it! Will disable TDX huge page if vm_memory_attributes is true.