linux-kernel - Re: [PATCH v7 07/14] KVM: Use gfn instead of hva for mmu_notifier

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Message-ID: <20220810081943.GB862421@chaop.bj.intel.com>
Date:   Wed, 10 Aug 2022 16:19:43 +0800
From:   Chao Peng <chao.p.peng@...ux.intel.com>
To:     Isaku Yamahata <isaku.yamahata@...il.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-api@...r.kernel.org, linux-doc@...r.kernel.org,
        qemu-devel@...gnu.org, linux-kselftest@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>,
        Hugh Dickins <hughd@...gle.com>,
        Jeff Layton <jlayton@...nel.org>,
        "J . Bruce Fields" <bfields@...ldses.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>, Mike Rapoport <rppt@...nel.org>,
        Steven Price <steven.price@....com>,
        "Maciej S . Szmigiero" <mail@...iej.szmigiero.name>,
        Vlastimil Babka <vbabka@...e.cz>,
        Vishal Annapurve <vannapurve@...gle.com>,
        Yu Zhang <yu.c.zhang@...ux.intel.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        luto@...nel.org, jun.nakajima@...el.com, dave.hansen@...el.com,
        ak@...ux.intel.com, david@...hat.com, aarcange@...hat.com,
        ddutile@...hat.com, dhildenb@...hat.com,
        Quentin Perret <qperret@...gle.com>,
        Michael Roth <michael.roth@....com>, mhocko@...e.com,
        Muchun Song <songmuchun@...edance.com>
Subject: Re: [PATCH v7 07/14] KVM: Use gfn instead of hva for
 mmu_notifier_retry

On Thu, Aug 04, 2022 at 12:10:44AM -0700, Isaku Yamahata wrote:
> On Wed, Jul 06, 2022 at 04:20:09PM +0800,
> Chao Peng <chao.p.peng@...ux.intel.com> wrote:
> 
> > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> > index 0bdb6044e316..e9153b54e2a4 100644
> > --- a/include/linux/kvm_host.h
> > +++ b/include/linux/kvm_host.h
> > @@ -1362,10 +1362,8 @@ void kvm_mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc);
> >  void *kvm_mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc);
> >  #endif
> >  
> > -void kvm_inc_notifier_count(struct kvm *kvm, unsigned long start,
> > -				   unsigned long end);
> > -void kvm_dec_notifier_count(struct kvm *kvm, unsigned long start,
> > -				   unsigned long end);
> > +void kvm_inc_notifier_count(struct kvm *kvm, gfn_t start, gfn_t end);
> > +void kvm_dec_notifier_count(struct kvm *kvm, gfn_t start, gfn_t end);
> >  
> >  long kvm_arch_dev_ioctl(struct file *filp,
> >  			unsigned int ioctl, unsigned long arg);
> 
> The corresponding changes in kvm_main.c are missing.

Exactly! Actually it's in the next patch while it should indeed in
this patch.

Chao
> 
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index b2c79bef61bd..0184e327f6f5 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -711,8 +711,7 @@ static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
>         kvm_handle_hva_range(mn, address, address + 1, pte, kvm_set_spte_gfn);
>  }
>  
> -void kvm_inc_notifier_count(struct kvm *kvm, unsigned long start,
> -                                  unsigned long end)
> +void kvm_inc_notifier_count(struct kvm *kvm, gfn_t start, gfn_t end)
>  {
>         /*
>          * The count increase must become visible at unlock time as no
> @@ -786,8 +785,7 @@ static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
>         return 0;
>  }
>  
> -void kvm_dec_notifier_count(struct kvm *kvm, unsigned long start,
> -                                  unsigned long end)
> +void kvm_dec_notifier_count(struct kvm *kvm, gfn_t start, gfn_t end)
>  {
>         /*
>          * This sequence increase will notify the kvm page fault that
> 
> 
> -- 
> Isaku Yamahata <isaku.yamahata@...il.com>