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Date: Mon, 26 Oct 2020 13:21:45 -0400
From: Tony Krowiak <akrowiak@...ux.ibm.com>
To: linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
kvm@...r.kernel.org
Cc: kbuild-all@...ts.01.org, freude@...ux.ibm.com,
borntraeger@...ibm.com, cohuck@...hat.com, mjrosato@...ux.ibm.com,
pasic@...ux.ibm.com, alex.williamson@...hat.com,
kwankhede@...dia.com
Subject: Re: [PATCH v11 12/14] s390/vfio-ap: handle host AP config change
notification
On 10/22/20 5:17 PM, kernel test robot wrote:
> 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@...el.com>
>
> 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)
> | ^~~~~~~~~~~~~~~~~~~~~~~
Needs to be static, will fix.
> 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();
> | ^~~~~~~~~~~~~~~~~~
Will replace memcpy with bitmap_copy.
>
> 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@lists.01.org
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