Re: [PATCH v10 08/16] KVM: guest_memfd: Allow host to map guest_memfd pages

[kernel test robot <lkp@intel.com>]

Hi Fuad,

kernel test robot noticed the following build errors:

[auto build test ERROR on 0ff41df1cb268fc69e703a08a57ee14ae967d0ca]

url:    https://github.com/intel-lab-lkp/linux/commits/Fuad-Tabba/KVM-Rename-CONFIG_KVM_PRIVATE_MEM-to-CONFIG_KVM_GMEM/20250528-020608
base:   0ff41df1cb268fc69e703a08a57ee14ae967d0ca
patch link:    https://lore.kernel.org/r/20250527180245.1413463-9-tabba%40google.com
patch subject: [PATCH v10 08/16] KVM: guest_memfd: Allow host to map guest_memfd pages
config: powerpc-allmodconfig (https://download.01.org/0day-ci/archive/20250529/202505290736.HR4GYiOF-lkp@intel.com/config)
compiler: powerpc64-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250529/202505290736.HR4GYiOF-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202505290736.HR4GYiOF-lkp@intel.com/

All errors (new ones prefixed by >>):

   arch/powerpc/kvm/../../../virt/kvm/guest_memfd.c: In function '__kvm_gmem_create':
   arch/powerpc/kvm/../../../virt/kvm/guest_memfd.c:487:14: error: implicit declaration of function 'get_unused_fd_flags' [-Wimplicit-function-declaration]
     487 |         fd = get_unused_fd_flags(0);
         |              ^~~~~~~~~~~~~~~~~~~
   arch/powerpc/kvm/../../../virt/kvm/guest_memfd.c:524:9: error: implicit declaration of function 'fd_install'; did you mean 'fs_initcall'? [-Wimplicit-function-declaration]
     524 |         fd_install(fd, file);
         |         ^~~~~~~~~~
         |         fs_initcall
   arch/powerpc/kvm/../../../virt/kvm/guest_memfd.c:530:9: error: implicit declaration of function 'put_unused_fd'; did you mean 'put_user_ns'? [-Wimplicit-function-declaration]
     530 |         put_unused_fd(fd);
         |         ^~~~~~~~~~~~~
         |         put_user_ns
   arch/powerpc/kvm/../../../virt/kvm/guest_memfd.c: In function 'kvm_gmem_create':
>> arch/powerpc/kvm/../../../virt/kvm/guest_memfd.c:540:13: error: implicit declaration of function 'kvm_arch_supports_gmem_shared_mem' [-Wimplicit-function-declaration]
     540 |         if (kvm_arch_supports_gmem_shared_mem(kvm))
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/powerpc/kvm/../../../virt/kvm/guest_memfd.c: In function 'kvm_gmem_bind':
   arch/powerpc/kvm/../../../virt/kvm/guest_memfd.c:564:16: error: implicit declaration of function 'fget'; did you mean 'sget'? [-Wimplicit-function-declaration]
     564 |         file = fget(fd);
         |                ^~~~
         |                sget
   arch/powerpc/kvm/../../../virt/kvm/guest_memfd.c:564:14: error: assignment to 'struct file *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
     564 |         file = fget(fd);
         |              ^
   arch/powerpc/kvm/../../../virt/kvm/guest_memfd.c:614:9: error: implicit declaration of function 'fput'; did you mean 'iput'? [-Wimplicit-function-declaration]
     614 |         fput(file);
         |         ^~~~
         |         iput


vim +/kvm_arch_supports_gmem_shared_mem +540 arch/powerpc/kvm/../../../virt/kvm/guest_memfd.c

   533	
   534	int kvm_gmem_create(struct kvm *kvm, struct kvm_create_guest_memfd *args)
   535	{
   536		loff_t size = args->size;
   537		u64 flags = args->flags;
   538		u64 valid_flags = 0;
   539	
 > 540		if (kvm_arch_supports_gmem_shared_mem(kvm))
   541			valid_flags |= GUEST_MEMFD_FLAG_SUPPORT_SHARED;
   542	
   543		if (flags & ~valid_flags)
   544			return -EINVAL;
   545	
   546		if (size <= 0 || !PAGE_ALIGNED(size))
   547			return -EINVAL;
   548	
   549		return __kvm_gmem_create(kvm, size, flags);
   550	}
   551	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki