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

[Chao Peng <chao.p.peng@xxxxxxxxxxxxxxx>]

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
> >