linux-kernel - Re: [PATCH v7 11/14] KVM: Register/unregister the guest private memory regions

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Date:   Mon, 29 Aug 2022 23:21:07 +0800
From:   Chao Peng <chao.p.peng@...ux.intel.com>
To:     Fuad Tabba <tabba@...gle.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 11/14] KVM: Register/unregister the guest private
 memory regions

On Fri, Aug 26, 2022 at 04:19:43PM +0100, Fuad Tabba wrote:
> > +bool __weak kvm_arch_private_mem_supported(struct kvm *kvm)
> > +{
> > +       return false;
> > +}
> > +
> >  static int check_memory_region_flags(const struct kvm_user_mem_region *mem)
> >  {
> >         u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
> > @@ -4689,6 +4729,22 @@ static long kvm_vm_ioctl(struct file *filp,
> >                 r = kvm_vm_ioctl_set_memory_region(kvm, &mem);
> >                 break;
> >         }
> > +#ifdef CONFIG_HAVE_KVM_PRIVATE_MEM
> > +       case KVM_MEMORY_ENCRYPT_REG_REGION:
> > +       case KVM_MEMORY_ENCRYPT_UNREG_REGION: {
> > +               struct kvm_enc_region region;
> > +
> > +               if (!kvm_arch_private_mem_supported(kvm))
> > +                       goto arch_vm_ioctl;
> > +
> > +               r = -EFAULT;
> > +               if (copy_from_user(&region, argp, sizeof(region)))
> > +                       goto out;
> > +
> > +               r = kvm_vm_ioctl_set_encrypted_region(kvm, ioctl, &region);
> > +               break;
> > +       }
> > +#endif
> >         case KVM_GET_DIRTY_LOG: {
> >                 struct kvm_dirty_log log;
> >
> > @@ -4842,6 +4898,7 @@ static long kvm_vm_ioctl(struct file *filp,
> >                 r = kvm_vm_ioctl_get_stats_fd(kvm);
> >                 break;
> >         default:
> > +arch_vm_ioctl:
> 
> It might be good to make this label conditional on
> CONFIG_HAVE_KVM_PRIVATE_MEM, otherwise you get a warning if
> CONFIG_HAVE_KVM_PRIVATE_MEM isn't defined.
> 
> +#ifdef CONFIG_HAVE_KVM_PRIVATE_MEM
>  arch_vm_ioctl:
> +#endif

Right, as the bot already complains.

Chao
> 
> Cheers,
> /fuad
> 
> 
> 
> 
> 
> >                 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
> >         }
> >  out:
> > --
> > 2.25.1
> >