Hi Ard, First bad commit (maybe != root cause): tree: git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git kvm-trng head: ce24e6d7812bdc252275c33141fef8d8ec065b9c commit: 133ead68041bbb2bef5dba91fdc8c330d1ab50e5 [3/8] arm64: kvm: build cloned NVHE objects in the nvhe/ build tree config: arm64-allyesconfig (attached as .config) compiler: aarch64-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://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/commit/?id... git remote add ardb git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git git fetch --no-tags ardb kvm-trng git checkout 133ead68041bbb2bef5dba91fdc8c330d1ab50e5 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): vim +97 arch/arm64/kvm/hyp/aarch32.c 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 85 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 86 /** 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 87 * adjust_itstate - adjust ITSTATE when emulating instructions in IT-block 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 88 * @vcpu: The VCPU pointer 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 89 * 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 90 * When exceptions occur while instructions are executed in Thumb IF-THEN 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 91 * blocks, the ITSTATE field of the CPSR is not advanced (updated), so we have 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 92 * to do this little bit of work manually. The fields map like this: 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 93 * 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 94 * IT[7:0] -> CPSR[26:25],CPSR[15:10] 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 95 */ c50cb04303cb88 arch/arm64/kvm/hyp/aarch32.c David Brazdil 2020-06-25 96 static void kvm_adjust_itstate(struct kvm_vcpu *vcpu) 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 @97 { 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 98 unsigned long itbits, cond; 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 99 unsigned long cpsr = *vcpu_cpsr(vcpu); 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 100 bool is_arm = !(cpsr & PSR_AA32_T_BIT); 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 101 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 102 if (is_arm || !(cpsr & PSR_AA32_IT_MASK)) 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 103 return; 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 104 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 105 cond = (cpsr & 0xe000) >> 13; 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 106 itbits = (cpsr & 0x1c00) >> (10 - 2); 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 107 itbits |= (cpsr & (0x3 << 25)) >> 25; 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 108 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 109 /* Perform ITAdvance (see page A2-52 in ARM DDI 0406C) */ 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 110 if ((itbits & 0x7) == 0) 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 111 itbits = cond = 0; 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 112 else 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 113 itbits = (itbits << 1) & 0x1f; 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 114 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 115 cpsr &= ~PSR_AA32_IT_MASK; 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 116 cpsr |= cond << 13; 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 117 cpsr |= (itbits & 0x1c) << (10 - 2); 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 118 cpsr |= (itbits & 0x3) << 25; 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 119 *vcpu_cpsr(vcpu) = cpsr; 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 120 } 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 121 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 122 /** 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 123 * kvm_skip_instr - skip a trapped instruction and proceed to the next 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 124 * @vcpu: The vcpu pointer 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 125 */ 6ddbc281e2aa21 arch/arm64/kvm/hyp/aarch32.c Marc Zyngier 2020-10-13 126 void kvm_skip_instr32(struct kvm_vcpu *vcpu) 623e1528d4090b virt/kvm/arm/hyp/aarch32.c James Morse 2019-05-22 @127 { :::::: The code at line 97 was first introduced by commit :::::: 623e1528d4090bd1abaf93ec46f047dee9a6fb32 KVM: arm/arm64: Move cc/it checks under hyp's Makefile to avoid instrumentation :::::: TO: James Morse <james.morse(a)arm.com&gt; :::::: CC: Marc Zyngier <marc.zyngier(a)arm.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org