linux-kernel - Re: [PATCH v2 03/10] KVM: x86/mmu: Extract __kvm_mmu_do_page

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Date: Tue, 16 Apr 2024 16:52:30 -0700
From: Isaku Yamahata <isaku.yamahata@...el.com>
To: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
Cc: "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"Yamahata, Isaku" <isaku.yamahata@...el.com>,
	"seanjc@...gle.com" <seanjc@...gle.com>,
	"Huang, Kai" <kai.huang@...el.com>,
	"federico.parola@...ito.it" <federico.parola@...ito.it>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"isaku.yamahata@...il.com" <isaku.yamahata@...il.com>,
	"dmatlack@...gle.com" <dmatlack@...gle.com>,
	"michael.roth@....com" <michael.roth@....com>,
	"pbonzini@...hat.com" <pbonzini@...hat.com>,
	isaku.yamahata@...ux.intel.com
Subject: Re: [PATCH v2 03/10] KVM: x86/mmu: Extract __kvm_mmu_do_page_fault()

On Tue, Apr 16, 2024 at 02:36:31PM +0000,
"Edgecombe, Rick P" <rick.p.edgecombe@...el.com> wrote:

> On Wed, 2024-04-10 at 15:07 -0700, isaku.yamahata@...el.com wrote:
> > From: Isaku Yamahata <isaku.yamahata@...el.com>
> > 
> > Extract out __kvm_mmu_do_page_fault() from kvm_mmu_do_page_fault().  The
> > inner function is to initialize struct kvm_page_fault and to call the fault
> > handler, and the outer function handles updating stats and converting
> > return code.  KVM_MAP_MEMORY will call the KVM page fault handler.
> > 
> > This patch makes the emulation_type always set irrelevant to the return
>            a comma would help parse this better ^
> > code.
> 
> >   kvm_mmu_page_fault() is the only caller of kvm_mmu_do_page_fault(),
> 
> Not technically correct, there are other callers that pass NULL for
> emulation_type.
> 
> > and references the value only when PF_RET_EMULATE is returned.  Therefore,
> > this adjustment doesn't affect functionality.
> 
> Is there a problem with dropping the argument then?
> 
> > 
> > No functional change intended.
> 
> Can we not use the "intended"? It sounds like hedging for excuses.

Thanks for review.
As Chao pointed out, this patch is unnecessary.  I'll use
kvm_mmu_do_page_fault() directly with updating vcpu->stat.

https://lore.kernel.org/all/20240416234334.GA3039520@ls.amr.corp.intel.com/
-- 
Isaku Yamahata <isaku.yamahata@...el.com>