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

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Message-ID: <aWmEegVP_A613WIr@google.com>
Date: Thu, 15 Jan 2026 16:21:14 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Yan Zhao <yan.y.zhao@...el.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 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.