linux-kernel - Re: [PATCH 3/6] KVM: x86/mmu: Deduplicate rmap freeing in allocate_memslot

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Message-ID: <CANgfPd9OrCFoH1=2G_GD5MB5R54q5w=SDKP7vLnHPvDZox5WiQ@mail.gmail.com>
Date:   Wed, 28 Apr 2021 09:23:56 -0700
From:   Ben Gardon <bgardon@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, kvm <kvm@...r.kernel.org>,
        Peter Xu <peterx@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Peter Shier <pshier@...gle.com>,
        Junaid Shahid <junaids@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        Yulei Zhang <yulei.kernel@...il.com>,
        Wanpeng Li <kernellwp@...il.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Xiao Guangrong <xiaoguangrong.eric@...il.com>
Subject: Re: [PATCH 3/6] KVM: x86/mmu: Deduplicate rmap freeing in allocate_memslot_rmap

On Wed, Apr 28, 2021 at 3:00 AM Paolo Bonzini <pbonzini@...hat.com> wrote:
>
> Typo in the commit subject, I guess?

Oh woops, yeah It should just be "Deduplicate rmap freeing" or
something to that effect.

>
> Paolo
>
> On 28/04/21 00:36, Ben Gardon wrote:
> > Small code deduplication. No functional change expected.
> >
> > Signed-off-by: Ben Gardon <bgardon@...gle.com>
> > ---
> >   arch/x86/kvm/x86.c | 19 +++++++++++--------
> >   1 file changed, 11 insertions(+), 8 deletions(-)
> >
> > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> > index cf3b67679cf0..5bcf07465c47 100644
> > --- a/arch/x86/kvm/x86.c
> > +++ b/arch/x86/kvm/x86.c
> > @@ -10818,17 +10818,23 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
> >       kvm_hv_destroy_vm(kvm);
> >   }
> >
> > -void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)
> > +static void free_memslot_rmap(struct kvm_memory_slot *slot)
> >   {
> >       int i;
> >
> >       for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
> >               kvfree(slot->arch.rmap[i]);
> >               slot->arch.rmap[i] = NULL;
> > +     }
> > +}
> >
> > -             if (i == 0)
> > -                     continue;
> > +void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)
> > +{
> > +     int i;
> > +
> > +     free_memslot_rmap(slot);
> >
> > +     for (i = 1; i < KVM_NR_PAGE_SIZES; ++i) {
> >               kvfree(slot->arch.lpage_info[i - 1]);
> >               slot->arch.lpage_info[i - 1] = NULL;
> >       }
> > @@ -10894,12 +10900,9 @@ static int kvm_alloc_memslot_metadata(struct kvm_memory_slot *slot,
> >       return 0;
> >
> >   out_free:
> > -     for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
> > -             kvfree(slot->arch.rmap[i]);
> > -             slot->arch.rmap[i] = NULL;
> > -             if (i == 0)
> > -                     continue;
> > +     free_memslot_rmap(slot);
> >
> > +     for (i = 1; i < KVM_NR_PAGE_SIZES; ++i) {
> >               kvfree(slot->arch.lpage_info[i - 1]);
> >               slot->arch.lpage_info[i - 1] = NULL;
> >       }
> >
>