linux-kernel - Re: [PATCH 1/2] KVM: kvm_is_visible

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Message-ID: <20151116023757.GB3592@yaowei-K42JY>
Date:	Mon, 16 Nov 2015 10:37:57 +0800
From:	Yaowei Bai <baiyaowei@...s.chinamobile.com>
To:	Amos Jianjun Kong <kongjianjun@...il.com>
Cc:	gleb@...nel.org, Paolo Bonzini <pbonzini@...hat.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	Alexander Graf <agraf@...e.de>
Subject: Re: [PATCH 1/2] KVM: kvm_is_visible_gfn can be boolean

On Sat, Nov 14, 2015 at 06:07:51PM +0800, Amos Jianjun Kong wrote:
> On Sat, Nov 14, 2015 at 11:21 AM, Yaowei Bai
> <baiyaowei@...s.chinamobile.com> wrote:
> > This patch makes kvm_is_visible_gfn return bool due to this particular
> > function only using either one or zero as its return value.
> >
> > No functional change.
> >
> > Signed-off-by: Yaowei Bai <baiyaowei@...s.chinamobile.com>
> 
> Hi Yaowei,

Hi,

> 
> > ---
> >  include/linux/kvm_host.h | 2 +-
> >  virt/kvm/kvm_main.c      | 6 +++---
> >  2 files changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> > index 5706a21..4436539 100644
> > --- a/include/linux/kvm_host.h
> > +++ b/include/linux/kvm_host.h
> > @@ -623,7 +623,7 @@ int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
> >  int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
> >  int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
> >  struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
> > -int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
> > +bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
> >  unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn);
> >  void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
> >
> > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> > index 484079e..73cbb41 100644
> > --- a/virt/kvm/kvm_main.c
> > +++ b/virt/kvm/kvm_main.c
> > @@ -1164,15 +1164,15 @@ struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn
> >         return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn);
> >  }
> >
> > -int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
> > +bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
> >  {
> >         struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
> >
> >         if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS ||
> >               memslot->flags & KVM_MEMSLOT_INVALID)
> > -               return 0;
> > +               return false;
> >
> > -       return 1;
> > +       return true;
> >  }
> >  EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
> 
> 
> kvm_is_visible_gfn() is also used in arch/powerpc/kvm/book3s_pr.c:
> 
> static int kvmppc_visible_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
> {
> ......
>         if (unlikely(mp_pa) && unlikely((mp_pa & KVM_PAM) == (gpa & KVM_PAM))) {
>                 return 1;
>         }
> 
>         return kvm_is_visible_gfn(vcpu->kvm, gpa >> PAGE_SHIFT);
> }
> 
> Do we still need to update that function?

OK, i'll send another patch to update it, thanks.

> 
> Thanks, Amos


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