Re: [PATCH] ptp: kvm: Use decrypted memory in confidential guest on x86

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

Hi Jeremi,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on horms-ipvs/master]
[also build test ERROR on mst-vhost/linux-next net/master net-next/master linus/master v6.2]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Jeremi-Piotrowski/ptp-kvm-Use-decrypted-memory-in-confidential-guest-on-x86/20230220-210441
base:   https://git.kernel.org/pub/scm/linux/kernel/git/horms/ipvs.git master
patch link:    https://lore.kernel.org/r/20230220130235.2603366-1-jpiotrowski%40linux.microsoft.com
patch subject: [PATCH] ptp: kvm: Use decrypted memory in confidential guest on x86
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20230221/202302211746.oclm0ibu-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/0dd1701fd254692af3d0ca051e092e8dcef190c4
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Jeremi-Piotrowski/ptp-kvm-Use-decrypted-memory-in-confidential-guest-on-x86/20230220-210441
        git checkout 0dd1701fd254692af3d0ca051e092e8dcef190c4
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202302211746.oclm0ibu-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/ptp/ptp_kvm_x86.c: In function 'kvm_arch_ptp_init':
>> drivers/ptp/ptp_kvm_x86.c:63:9: error: implicit declaration of function 'kvm_arch_ptp_exit'; did you mean 'kvm_arch_ptp_init'? [-Werror=implicit-function-declaration]
      63 |         kvm_arch_ptp_exit();
         |         ^~~~~~~~~~~~~~~~~
         |         kvm_arch_ptp_init
   drivers/ptp/ptp_kvm_x86.c: At top level:
   drivers/ptp/ptp_kvm_x86.c:68:6: warning: no previous prototype for 'kvm_arch_ptp_exit' [-Wmissing-prototypes]
      68 | void kvm_arch_ptp_exit(void)
         |      ^~~~~~~~~~~~~~~~~
   drivers/ptp/ptp_kvm_x86.c:68:6: warning: conflicting types for 'kvm_arch_ptp_exit'; have 'void(void)'
   drivers/ptp/ptp_kvm_x86.c:63:9: note: previous implicit declaration of 'kvm_arch_ptp_exit' with type 'void(void)'
      63 |         kvm_arch_ptp_exit();
         |         ^~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors
--
   drivers/ptp/ptp_kvm_common.c: In function 'ptp_kvm_exit':
>> drivers/ptp/ptp_kvm_common.c:133:9: error: implicit declaration of function 'kvm_arch_ptp_exit'; did you mean 'kvm_arch_ptp_init'? [-Werror=implicit-function-declaration]
     133 |         kvm_arch_ptp_exit();
         |         ^~~~~~~~~~~~~~~~~
         |         kvm_arch_ptp_init
   cc1: some warnings being treated as errors


vim +63 drivers/ptp/ptp_kvm_x86.c

    22	
    23	int kvm_arch_ptp_init(void)
    24	{
    25		struct page *p;
    26		long ret;
    27	
    28		if (!kvm_para_available())
    29			return -ENODEV;
    30	
    31		if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) {
    32			p = alloc_page(GFP_KERNEL | __GFP_ZERO);
    33			if (!p)
    34				return -ENOMEM;
    35	
    36			clock_pair = page_address(p);
    37			ret = set_memory_decrypted((unsigned long)clock_pair, 1);
    38			if (ret) {
    39				__free_page(p);
    40				clock_pair = NULL;
    41				goto nofree;
    42			}
    43		} else {
    44			clock_pair = &clock_pair_glbl;
    45		}
    46	
    47		clock_pair_gpa = slow_virt_to_phys(clock_pair);
    48		if (!pvclock_get_pvti_cpu0_va()) {
    49			ret = -ENODEV;
    50			goto err;
    51		}
    52	
    53		ret = kvm_hypercall2(KVM_HC_CLOCK_PAIRING, clock_pair_gpa,
    54				     KVM_CLOCK_PAIRING_WALLCLOCK);
    55		if (ret == -KVM_ENOSYS) {
    56			ret = -ENODEV;
    57			goto err;
    58		}
    59	
    60		return ret;
    61	
    62	err:
  > 63		kvm_arch_ptp_exit();
    64	nofree:
    65		return ret;
    66	}
    67	

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