Hi Anastassios, Thank you for the patch! Yet something to improve: [auto build test ERROR on v5.7-rc6] [cannot apply to kvm/linux-next kvmarm/next tip/x86/core next-20200515] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Anastassios-Nanos/Expose-KVM-API-to-Linux-Kernel/20200518-150402 base: b9bbe6ed63b2b9f2c9ee5cbd0f2c946a2723f4ce config: powerpc-defconfig (attached as .config) compiler: powerpc64-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>, old ones prefixed by <<): arch/powerpc/kvm/../../../virt/kvm/kvm_main.c: In function 'hva_to_pfn_slow': >> arch/powerpc/kvm/../../../virt/kvm/kvm_main.c:1837:4: error: 'npages_local' undeclared (first use in this function) 1837 | npages_local = 1; | ^~~~~~~~~~~~ arch/powerpc/kvm/../../../virt/kvm/kvm_main.c:1837:4: note: each undeclared identifier is reported only once for each function it appears in vim +/npages_local +1837 arch/powerpc/kvm/../../../virt/kvm/kvm_main.c 1800 1801 /* 1802 * The slow path to get the pfn of the specified host virtual address, 1803 * 1 indicates success, -errno is returned if error is detected. 1804 */ 1805 static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault, 1806 bool *writable, kvm_pfn_t *pfn) 1807 { 1808 unsigned int flags = FOLL_HWPOISON; 1809 struct page *page; 1810 int npages = 0; 1811 1812 might_sleep(); 1813 1814 if (writable) 1815 *writable = write_fault; 1816 1817 if (write_fault) 1818 flags |= FOLL_WRITE; 1819 if (async) 1820 flags |= FOLL_NOWAIT; 1821 1822 if (kvmm_valid_addr(addr)) { 1823 npages = 1; 1824 page = vmalloc_to_page((void *)addr); 1825 } else { 1826 npages = get_user_pages_unlocked(addr, 1, &page, flags); 1827 } 1828 if (npages != 1) 1829 return npages; 1830 1831 /* map read fault as writable if possible */ 1832 if (unlikely(!write_fault) && writable) { 1833 struct page *wpage; 1834 int lnpages = 0; 1835 1836 if (kvmm_valid_addr(addr)) { > 1837 npages_local = 1; 1838 wpage = vmalloc_to_page((void *)addr); 1839 } else { 1840 lnpages = __get_user_pages_fast(addr, 1, 1, &wpage); 1841 } 1842 1843 if (lnpages == 1) { 1844 *writable = true; 1845 put_page(page); 1846 page = wpage; 1847 } 1848 } 1849 *pfn = page_to_pfn(page); 1850 return npages; 1851 } 1852 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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