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    SubjectRe: [PATCH v3 5/5] KVM: arm64: Unwind and dump nVHE hypervisor stacktrace
    Hi Kalesh,

    Thank you for the patch! Yet something to improve:

    [auto build test ERROR on f2906aa863381afb0015a9eb7fefad885d4e5a56]

    url: https://github.com/intel-lab-lkp/linux/commits/Kalesh-Singh/KVM-nVHE-Hypervisor-stack-unwinder/20220608-011351
    base: f2906aa863381afb0015a9eb7fefad885d4e5a56
    config: arm64-randconfig-c024-20220612 (https://download.01.org/0day-ci/archive/20220613/202206131423.8tjrMBgk-lkp@intel.com/config)
    compiler: aarch64-linux-gcc (GCC) 11.3.0
    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/intel-lab-lkp/linux/commit/ac1ce397ffe5b05df06cdb56a30db4099c7428ec
    git remote add linux-review https://github.com/intel-lab-lkp/linux
    git fetch --no-tags linux-review Kalesh-Singh/KVM-nVHE-Hypervisor-stack-unwinder/20220608-011351
    git checkout ac1ce397ffe5b05df06cdb56a30db4099c7428ec
    # save the config file
    mkdir build_dir && cp config build_dir/.config
    COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash

    If you fix the issue, kindly add following tag where applicable
    Reported-by: kernel test robot <lkp@intel.com>

    All errors (new ones prefixed by >>):

    aarch64-linux-ld: arch/arm64/kernel/stacktrace.o: in function `hyp_dump_backtrace':
    >> arch/arm64/kernel/stacktrace.c:254: undefined reference to `kvm_arm_hyp_stacktrace_page'
    aarch64-linux-ld: arch/arm64/kernel/stacktrace.o: relocation R_AARCH64_ADR_PREL_PG_HI21 against symbol `kvm_arm_hyp_stacktrace_page' which may bind externally can not be used when making a shared object; recompile with -fPIC
    arch/arm64/kernel/stacktrace.c:254:(.text+0x634): dangerous relocation: unsupported relocation
    >> aarch64-linux-ld: arch/arm64/kernel/stacktrace.c:254: undefined reference to `kvm_arm_hyp_stacktrace_page'
    pahole: .tmp_vmlinux.btf: No such file or directory
    .btf.vmlinux.bin.o: file not recognized: file format not recognized


    vim +254 arch/arm64/kernel/stacktrace.c

    246
    247 /**
    248 * Symbolizes and dumps the hypervisor backtrace from the shared
    249 * stacktrace page.
    250 */
    251 noinline notrace void hyp_dump_backtrace(unsigned long hyp_offset)
    252 {
    253 unsigned long *stacktrace_pos =
    > 254 (unsigned long *)*this_cpu_ptr(&kvm_arm_hyp_stacktrace_page);
    255 unsigned long va_mask = GENMASK_ULL(vabits_actual - 1, 0);
    256 unsigned long pc = *stacktrace_pos++;
    257
    258 kvm_err("nVHE HYP call trace:\n");
    259
    260 while (pc) {
    261 pc &= va_mask; /* Mask tags */
    262 pc += hyp_offset; /* Convert to kern addr */
    263 kvm_err("[<%016lx>] %pB\n", pc, (void *)pc);
    264 pc = *stacktrace_pos++;
    265 }
    266
    267 kvm_err("---- end of nVHE HYP call trace ----\n");
    268 }
    269 #else /* __KVM_NVHE_HYPERVISOR__ */
    270 DEFINE_PER_CPU(unsigned long [PAGE_SIZE/sizeof(long)], overflow_stack)
    271 __aligned(16);
    272

    --
    0-DAY CI Kernel Test Service
    https://01.org/lkp

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