linux-kernel - Re: [RFC PATCH v12 01/33] KVM: Tweak kvm_hva_range and hva_handler

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Date:   Fri, 15 Sep 2023 14:05:27 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Xiaoyao Li <xiaoyao.li@...el.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Huacai Chen <chenhuacai@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Anup Patel <anup@...infault.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Paul Moore <paul@...l-moore.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>, kvm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Chao Peng <chao.p.peng@...ux.intel.com>,
        Fuad Tabba <tabba@...gle.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Anish Moorthy <amoorthy@...gle.com>,
        Yu Zhang <yu.c.zhang@...ux.intel.com>,
        Isaku Yamahata <isaku.yamahata@...el.com>,
        Xu Yilun <yilun.xu@...el.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Vishal Annapurve <vannapurve@...gle.com>,
        Ackerley Tng <ackerleytng@...gle.com>,
        Maciej Szmigiero <mail@...iej.szmigiero.name>,
        David Hildenbrand <david@...hat.com>,
        Quentin Perret <qperret@...gle.com>,
        Michael Roth <michael.roth@....com>,
        Wang <wei.w.wang@...el.com>,
        Liam Merwick <liam.merwick@...cle.com>,
        Isaku Yamahata <isaku.yamahata@...il.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [RFC PATCH v12 01/33] KVM: Tweak kvm_hva_range and hva_handler_t
 to allow reusing for gfn ranges

On Fri, Sep 15, 2023, Xiaoyao Li wrote:
> On 9/14/2023 9:54 AM, Sean Christopherson wrote:
> > Rework and rename "struct kvm_hva_range" into "kvm_mmu_notifier_range" so
> > that the structure can be used to handle notifications that operate on gfn
> > context, i.e. that aren't tied to a host virtual address.
> > 
> > Practically speaking, this is a nop for 64-bit kernels as the only
> > meaningful change is to store start+end as u64s instead of unsigned longs.
> > 
> > Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>
> > Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> > ---
> >   virt/kvm/kvm_main.c | 34 +++++++++++++++++++---------------
> >   1 file changed, 19 insertions(+), 15 deletions(-)
> > 
> > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> > index 486800a7024b..0524933856d4 100644
> > --- a/virt/kvm/kvm_main.c
> > +++ b/virt/kvm/kvm_main.c
> > @@ -541,18 +541,22 @@ static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
> >   	return container_of(mn, struct kvm, mmu_notifier);
> >   }
> > -typedef bool (*hva_handler_t)(struct kvm *kvm, struct kvm_gfn_range *range);
> > +typedef bool (*gfn_handler_t)(struct kvm *kvm, struct kvm_gfn_range *range);
> 
> Is it worth mentioning the rename of it as well in changelog?

Meh, I suppose.  At some point, we do have to assume a certain level of code
literacy though :-)