Re: [PATCH RFC] virtio-mem: support Confidential Computing (CoCo) environments

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

Hi Marc-André,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

[auto build test ERROR on c369299895a591d96745d6492d4888259b004a9e]

url:    https://github.com/intel-lab-lkp/linux/commits/Marc-Andr-Lureau/virtio-mem-support-Confidential-Computing-CoCo-environments/20260414-201359
base:   c369299895a591d96745d6492d4888259b004a9e
patch link:    https://lore.kernel.org/r/20260401-coco-v1-1-b9c3072e2d9c%40redhat.com
patch subject: [PATCH RFC] virtio-mem: support Confidential Computing (CoCo) environments
config: s390-allmodconfig (https://download.01.org/0day-ci/archive/20260415/202604152042.Ddpp3f0z-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260415/202604152042.Ddpp3f0z-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/202604152042.Ddpp3f0z-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/virtio/virtio_mem.c:876:9: error: call to undeclared function 'set_memory_encrypted'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     876 |         return set_memory_encrypted((unsigned long)__va(addr), PFN_DOWN(size));
         |                ^
>> drivers/virtio/virtio_mem.c:881:9: error: call to undeclared function 'set_memory_decrypted'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     881 |         return set_memory_decrypted((unsigned long)__va(addr), PFN_DOWN(size));
         |                ^
   2 errors generated.


vim +/set_memory_encrypted +876 drivers/virtio/virtio_mem.c

   868	
   869	/*
   870	 * In CoCo (TDX, SEV-SNP) environments, hotplugged memory must be explicitly
   871	 * accepted before use (private/encrypted), and converted to shared/decrypted
   872	 * before returning to the hypervisor on unplug.
   873	 */
   874	static int virtio_mem_coco_set_encrypted(uint64_t addr, uint64_t size)
   875	{
 > 876		return set_memory_encrypted((unsigned long)__va(addr), PFN_DOWN(size));
   877	}
   878	
   879	static int virtio_mem_coco_set_decrypted(uint64_t addr, uint64_t size)
   880	{
 > 881		return set_memory_decrypted((unsigned long)__va(addr), PFN_DOWN(size));
   882	}
   883	

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