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

Chao Peng
2022-08-29T15:26:03Z

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
> >