Re: [PATCH v11 12/14] s390/vfio-ap: handle host AP config change notification

[kernel test robot]

Hi Tony,

I love your patch! Perhaps something to improve:

[auto build test WARNING on s390/features]
[also build test WARNING on linus/master next-20201022]
[cannot apply to kvms390/next linux/master v5.9]
[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]

url:    https://github.com/0day-ci/linux/commits/Tony-Krowiak/s390-vfio-ap-dynamic-configuration-support/20201023-011543
base:   https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git features
config: s390-allyesconfig (attached as .config)
compiler: s390-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/32786ef6d4ba3703d993a8894ea1d763785fd3a4
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Tony-Krowiak/s390-vfio-ap-dynamic-configuration-support/20201023-011543
        git checkout 32786ef6d4ba3703d993a8894ea1d763785fd3a4
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=s390 

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

All warnings (new ones prefixed by >>):

   drivers/s390/crypto/vfio_ap_ops.c:1316:5: warning: no previous prototype for 'vfio_ap_mdev_reset_queue' [-Wmissing-prototypes]
    1316 | int vfio_ap_mdev_reset_queue(unsigned int apid, unsigned int apqi,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~
   drivers/s390/crypto/vfio_ap_ops.c:1568:6: warning: no previous prototype for 'vfio_ap_mdev_hot_unplug_queue' [-Wmissing-prototypes]
    1568 | void vfio_ap_mdev_hot_unplug_queue(struct vfio_ap_queue *q)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/s390/crypto/vfio_ap_ops.c: In function 'vfio_ap_mdev_on_cfg_remove':
>> drivers/s390/crypto/vfio_ap_ops.c:1777:7: warning: variable 'unassigned' set but not used [-Wunused-but-set-variable]
    1777 |  bool unassigned = false;
         |       ^~~~~~~~~~
   drivers/s390/crypto/vfio_ap_ops.c: At top level:
>> drivers/s390/crypto/vfio_ap_ops.c:1813:6: warning: no previous prototype for 'vfio_ap_mdev_on_cfg_add' [-Wmissing-prototypes]
    1813 | void vfio_ap_mdev_on_cfg_add(void)
         |      ^~~~~~~~~~~~~~~~~~~~~~~
   In file included from drivers/s390/crypto/vfio_ap_ops.c:11:
   In function 'memcpy',
       inlined from 'vfio_ap_mdev_unassign_apids' at drivers/s390/crypto/vfio_ap_ops.c:1655:3,
       inlined from 'vfio_ap_mdev_on_cfg_remove' at drivers/s390/crypto/vfio_ap_ops.c:1800:8,
       inlined from 'vfio_ap_on_cfg_changed' at drivers/s390/crypto/vfio_ap_ops.c:1836:2:
   include/linux/string.h:402:4: error: call to '__read_overflow2' declared with attribute error: detected read beyond size of object passed as 2nd parameter
     402 |    __read_overflow2();
         |    ^~~~~~~~~~~~~~~~~~

vim +/unassigned +1777 drivers/s390/crypto/vfio_ap_ops.c

  1774	
  1775	static void vfio_ap_mdev_on_cfg_remove(void)
  1776	{
> 1777		bool unassigned = false;
  1778		int ap_remove, aq_remove;
  1779		struct ap_matrix_mdev *matrix_mdev;
  1780		DECLARE_BITMAP(apid_rem, AP_DEVICES);
  1781		DECLARE_BITMAP(apqi_rem, AP_DOMAINS);
  1782		unsigned long *cur_apm, *cur_aqm, *prev_apm, *prev_aqm;
  1783	
  1784		cur_apm = (unsigned long *)matrix_dev->config_info.apm;
  1785		cur_aqm = (unsigned long *)matrix_dev->config_info.aqm;
  1786		prev_apm = (unsigned long *)matrix_dev->config_info_prev.apm;
  1787		prev_aqm = (unsigned long *)matrix_dev->config_info_prev.aqm;
  1788	
  1789		ap_remove = bitmap_andnot(apid_rem, prev_apm, cur_apm, AP_DEVICES);
  1790		aq_remove = bitmap_andnot(apqi_rem, prev_aqm, cur_aqm, AP_DOMAINS);
  1791	
  1792		if (!ap_remove && !aq_remove)
  1793			return;
  1794	
  1795		list_for_each_entry(matrix_mdev, &matrix_dev->mdev_list, node) {
  1796			if (!vfio_ap_mdev_has_crycb(matrix_mdev))
  1797				continue;
  1798	
  1799			if (ap_remove) {
  1800				if (vfio_ap_mdev_unassign_apids(matrix_mdev, apid_rem))
  1801					unassigned = true;
  1802				vfio_ap_mdev_unlink_apids(matrix_mdev, apid_rem);
  1803			}
  1804	
  1805			if (aq_remove) {
  1806				if (vfio_ap_mdev_unassign_apqis(matrix_mdev, apqi_rem))
  1807					unassigned = true;
  1808				vfio_ap_mdev_unlink_apqis(matrix_mdev, apqi_rem);
  1809			}
  1810		}
  1811	}
  1812	
> 1813	void vfio_ap_mdev_on_cfg_add(void)
  1814	{
  1815		unsigned long *cur_apm, *cur_aqm, *prev_apm, *prev_aqm;
  1816	
  1817		cur_apm = (unsigned long *)matrix_dev->config_info.apm;
  1818		cur_aqm = (unsigned long *)matrix_dev->config_info.aqm;
  1819	
  1820		prev_apm = (unsigned long *)matrix_dev->config_info_prev.apm;
  1821		prev_aqm = (unsigned long *)matrix_dev->config_info_prev.aqm;
  1822	
  1823		bitmap_andnot(matrix_dev->ap_add, cur_apm, prev_apm, AP_DEVICES);
  1824		bitmap_andnot(matrix_dev->aq_add, cur_aqm, prev_aqm, AP_DOMAINS);
  1825	}
  1826	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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