linux-kernel - Re: [PATCH v3 5/5] KVM: arm64: Unwind and dump nVHE hypervisor stacktrace

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Date:   Mon, 13 Jun 2022 14:49:29 +0800
From:   kernel test robot <lkp@...el.com>
To:     Kalesh Singh <kaleshsingh@...gle.com>, mark.rutland@....com,
        broonie@...nel.org, maz@...nel.org
Cc:     kbuild-all@...ts.01.org, will@...nel.org, qperret@...gle.com,
        tabba@...gle.com, surenb@...gle.com, tjmercier@...gle.com,
        kernel-team@...roid.com, Kalesh Singh <kaleshsingh@...gle.com>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        "Madhavan T. Venkataraman" <madvenka@...ux.microsoft.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Jones <drjones@...hat.com>,
        Keir Fraser <keirf@...gle.com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Oliver Upton <oupton@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org
Subject: Re: [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@...el.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