[intel-tdx:kvm-upstream-workaround 685/846] arch/x86/kvm/../../../virt/kvm/kvm_main.c:4959:1: warning: label 'arch_vm_ioctl' defined but not used

From: kernel test robot
Date: Tue Aug 09 2022 - 18:41:10 EST

tree: https://github.com/intel/tdx.git kvm-upstream-workaround
head: 6e62680f6e4094d3986229a4145ebd54390dc110
commit: 446bed91935bf1bc401292a921d266416bf97cf9 [685/846] KVM: Register/unregister the guest private memory regions
config: i386-randconfig-a001-20220808 (https://download.01.org/0day-ci/archive/20220810/202208100656.yYNlLrHS-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
# https://github.com/intel/tdx/commit/446bed91935bf1bc401292a921d266416bf97cf9
git remote add intel-tdx https://github.com/intel/tdx.git
git fetch --no-tags intel-tdx kvm-upstream-workaround
git checkout 446bed91935bf1bc401292a921d266416bf97cf9
# save the config file
mkdir build_dir && cp config build_dir/.config
make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kvm/ virt/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

arch/x86/kvm/../../../virt/kvm/kvm_main.c: In function 'kvm_vm_ioctl':
>> arch/x86/kvm/../../../virt/kvm/kvm_main.c:4959:1: warning: label 'arch_vm_ioctl' defined but not used [-Wunused-label]
4959 | arch_vm_ioctl:
| ^~~~~~~~~~~~~


vim +/arch_vm_ioctl +4959 arch/x86/kvm/../../../virt/kvm/kvm_main.c

4735
4736 static long kvm_vm_ioctl(struct file *filp,
4737 unsigned int ioctl, unsigned long arg)
4738 {
4739 struct kvm *kvm = filp->private_data;
4740 void __user *argp = (void __user *)arg;
4741 int r;
4742
4743 if (kvm->mm != current->mm || kvm->vm_dead)
4744 return -EIO;
4745 switch (ioctl) {
4746 case KVM_CREATE_VCPU:
4747 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
4748 break;
4749 case KVM_ENABLE_CAP: {
4750 struct kvm_enable_cap cap;
4751
4752 r = -EFAULT;
4753 if (copy_from_user(&cap, argp, sizeof(cap)))
4754 goto out;
4755 r = kvm_vm_ioctl_enable_cap_generic(kvm, &cap);
4756 break;
4757 }
4758 case KVM_SET_USER_MEMORY_REGION: {
4759 struct kvm_user_mem_region mem;
4760 unsigned long size;
4761 u32 flags;
4762
4763 kvm_sanity_check_user_mem_region_alias();
4764
4765 memset(&mem, 0, sizeof(mem));
4766
4767 r = -EFAULT;
4768
4769 if (get_user(flags,
4770 (u32 __user *)(argp + offsetof(typeof(mem), flags))))
4771 goto out;
4772
4773 if (flags & KVM_MEM_PRIVATE) {
4774 r = -EINVAL;
4775 goto out;
4776 }
4777
4778 size = sizeof(struct kvm_userspace_memory_region);
4779
4780 if (copy_from_user(&mem, argp, size))
4781 goto out;
4782
4783 r = -EINVAL;
4784 if ((flags ^ mem.flags) & KVM_MEM_PRIVATE)
4785 goto out;
4786
4787 r = kvm_vm_ioctl_set_memory_region(kvm, &mem);
4788 break;
4789 }
4790 #ifdef CONFIG_HAVE_KVM_PRIVATE_MEM
4791 case KVM_MEMORY_ENCRYPT_REG_REGION:
4792 case KVM_MEMORY_ENCRYPT_UNREG_REGION: {
4793 struct kvm_enc_region region;
4794
4795 if (!kvm_arch_private_mem_supported(kvm))
4796 goto arch_vm_ioctl;
4797
4798 r = -EFAULT;
4799 if (copy_from_user(&region, argp, sizeof(region)))
4800 goto out;
4801
4802 r = kvm_vm_ioctl_set_encrypted_region(kvm, ioctl, &region);
4803 break;
4804 }
4805 #endif
4806 case KVM_GET_DIRTY_LOG: {
4807 struct kvm_dirty_log log;
4808
4809 r = -EFAULT;
4810 if (copy_from_user(&log, argp, sizeof(log)))
4811 goto out;
4812 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
4813 break;
4814 }
4815 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
4816 case KVM_CLEAR_DIRTY_LOG: {
4817 struct kvm_clear_dirty_log log;
4818
4819 r = -EFAULT;
4820 if (copy_from_user(&log, argp, sizeof(log)))
4821 goto out;
4822 r = kvm_vm_ioctl_clear_dirty_log(kvm, &log);
4823 break;
4824 }
4825 #endif
4826 #ifdef CONFIG_KVM_MMIO
4827 case KVM_REGISTER_COALESCED_MMIO: {
4828 struct kvm_coalesced_mmio_zone zone;
4829
4830 r = -EFAULT;
4831 if (copy_from_user(&zone, argp, sizeof(zone)))
4832 goto out;
4833 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
4834 break;
4835 }
4836 case KVM_UNREGISTER_COALESCED_MMIO: {
4837 struct kvm_coalesced_mmio_zone zone;
4838
4839 r = -EFAULT;
4840 if (copy_from_user(&zone, argp, sizeof(zone)))
4841 goto out;
4842 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
4843 break;
4844 }
4845 #endif
4846 case KVM_IRQFD: {
4847 struct kvm_irqfd data;
4848
4849 r = -EFAULT;
4850 if (copy_from_user(&data, argp, sizeof(data)))
4851 goto out;
4852 r = kvm_irqfd(kvm, &data);
4853 break;
4854 }
4855 case KVM_IOEVENTFD: {
4856 struct kvm_ioeventfd data;
4857
4858 r = -EFAULT;
4859 if (copy_from_user(&data, argp, sizeof(data)))
4860 goto out;
4861 r = kvm_ioeventfd(kvm, &data);
4862 break;
4863 }
4864 #ifdef CONFIG_HAVE_KVM_MSI
4865 case KVM_SIGNAL_MSI: {
4866 struct kvm_msi msi;
4867
4868 r = -EFAULT;
4869 if (copy_from_user(&msi, argp, sizeof(msi)))
4870 goto out;
4871 r = kvm_send_userspace_msi(kvm, &msi);
4872 break;
4873 }
4874 #endif
4875 #ifdef __KVM_HAVE_IRQ_LINE
4876 case KVM_IRQ_LINE_STATUS:
4877 case KVM_IRQ_LINE: {
4878 struct kvm_irq_level irq_event;
4879
4880 r = -EFAULT;
4881 if (copy_from_user(&irq_event, argp, sizeof(irq_event)))
4882 goto out;
4883
4884 r = kvm_vm_ioctl_irq_line(kvm, &irq_event,
4885 ioctl == KVM_IRQ_LINE_STATUS);
4886 if (r)
4887 goto out;
4888
4889 r = -EFAULT;
4890 if (ioctl == KVM_IRQ_LINE_STATUS) {
4891 if (copy_to_user(argp, &irq_event, sizeof(irq_event)))
4892 goto out;
4893 }
4894
4895 r = 0;
4896 break;
4897 }
4898 #endif
4899 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
4900 case KVM_SET_GSI_ROUTING: {
4901 struct kvm_irq_routing routing;
4902 struct kvm_irq_routing __user *urouting;
4903 struct kvm_irq_routing_entry *entries = NULL;
4904
4905 r = -EFAULT;
4906 if (copy_from_user(&routing, argp, sizeof(routing)))
4907 goto out;
4908 r = -EINVAL;
4909 if (!kvm_arch_can_set_irq_routing(kvm))
4910 goto out;
4911 if (routing.nr > KVM_MAX_IRQ_ROUTES)
4912 goto out;
4913 if (routing.flags)
4914 goto out;
4915 if (routing.nr) {
4916 urouting = argp;
4917 entries = vmemdup_user(urouting->entries,
4918 array_size(sizeof(*entries),
4919 routing.nr));
4920 if (IS_ERR(entries)) {
4921 r = PTR_ERR(entries);
4922 goto out;
4923 }
4924 }
4925 r = kvm_set_irq_routing(kvm, entries, routing.nr,
4926 routing.flags);
4927 kvfree(entries);
4928 break;
4929 }
4930 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
4931 case KVM_CREATE_DEVICE: {
4932 struct kvm_create_device cd;
4933
4934 r = -EFAULT;
4935 if (copy_from_user(&cd, argp, sizeof(cd)))
4936 goto out;
4937
4938 r = kvm_ioctl_create_device(kvm, &cd);
4939 if (r)
4940 goto out;
4941
4942 r = -EFAULT;
4943 if (copy_to_user(argp, &cd, sizeof(cd)))
4944 goto out;
4945
4946 r = 0;
4947 break;
4948 }
4949 case KVM_CHECK_EXTENSION:
4950 r = kvm_vm_ioctl_check_extension_generic(kvm, arg);
4951 break;
4952 case KVM_RESET_DIRTY_RINGS:
4953 r = kvm_vm_ioctl_reset_dirty_pages(kvm);
4954 break;
4955 case KVM_GET_STATS_FD:
4956 r = kvm_vm_ioctl_get_stats_fd(kvm);
4957 break;
4958 default:
> 4959 arch_vm_ioctl:
4960 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
4961 }
4962 out:
4963 return r;
4964 }
4965

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