linux-kernel - RE: [PATCH] KVM: Add the missing stub function for kvm_dirty_ring_check

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Date:   Thu, 16 Mar 2023 19:39:30 +0000
From:   Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
To:     Sean Christopherson <seanjc@...gle.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "gshan@...hat.com" <gshan@...hat.com>,
        "maz@...nel.org" <maz@...nel.org>
Subject: RE: [PATCH] KVM: Add the missing stub function for
 kvm_dirty_ring_check_request()



> -----Original Message-----
> From: Sean Christopherson [mailto:seanjc@...gle.com]
> Sent: 16 March 2023 17:02
> To: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
> Cc: linux-kernel@...r.kernel.org; kvm@...r.kernel.org; gshan@...hat.com;
> maz@...nel.org
> Subject: Re: [PATCH] KVM: Add the missing stub function for
> kvm_dirty_ring_check_request()
> 
> On Thu, Mar 16, 2023, Shameer Kolothum wrote:
> > The stub for !CONFIG_HAVE_KVM_DIRTY_RING case is missing.
> 
> No stub is needed.  kvm_dirty_ring_check_request() isn't called from
> common code,
> and should not (and isn't unless I'm missing something) be called from arch
> code
> unless CONFIG_HAVE_KVM_DIRTY_RING=y.
> 
> x86 and arm64 are the only users, and they both select
> HAVE_KVM_DIRTY_RING
> unconditionally when KVM is enabled.

Yes, it is at present not called from anywhere other than x86 and arm64.
But I still think since it is a common helper, better to have a stub.

Thanks,
Shameer