Hi Wanpeng, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on kvm/linux-next] [also build test WARNING on v5.2-rc2 next-20190524] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Wanpeng-Li/KVM-X86-Implement-PV-sched-yield-hypercall/20190528-132021 base: https://git.kernel.org/pub/scm/virt/kvm/kvm.git linux-next reproduce: # apt-get install sparse # sparse version: v0.6.1-rc1-7-g2b96cd8-dirty make ARCH=x86_64 allmodconfig make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> sparse warnings: (new ones prefixed by >>) arch/x86/kvm/x86.c:2379:38: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const [noderef] <asn:1> * @@ got const [noderef] <asn:1> * @@ arch/x86/kvm/x86.c:2379:38: sparse: expected void const [noderef] <asn:1> * arch/x86/kvm/x86.c:2379:38: sparse: got unsigned char [usertype] * arch/x86/kvm/x86.c:7181:15: sparse: sparse: incompatible types in comparison expression (different address spaces): arch/x86/kvm/x86.c:7181:15: sparse: struct kvm_apic_map [noderef] <asn:4> * arch/x86/kvm/x86.c:7181:15: sparse: struct kvm_apic_map * arch/x86/kvm/x86.c:7243:14: sparse: sparse: undefined identifier 'KVM_HC_SCHED_YIELD' >> arch/x86/kvm/x86.c:7243:14: sparse: sparse: incompatible types for 'case' statement arch/x86/kvm/x86.c:9408:16: sparse: sparse: incompatible types in comparison expression (different address spaces): arch/x86/kvm/x86.c:9408:16: sparse: struct kvm_apic_map [noderef] <asn:4> * arch/x86/kvm/x86.c:9408:16: sparse: struct kvm_apic_map * >> arch/x86/kvm/x86.c:7193:9: sparse: sparse: context imbalance in 'kvm_sched_yield' - wrong count at exit arch/x86/kvm/x86.c:7243:14: sparse: sparse: Expected constant expression in case statement vim +/case +7243 arch/x86/kvm/x86.c 7174 7175 void kvm_sched_yield(struct kvm *kvm, u64 dest_id) 7176 { 7177 struct kvm_vcpu *target; 7178 struct kvm_apic_map *map; 7179 7180 rcu_read_lock(); 7181 map = rcu_dereference(kvm->arch.apic_map); 7182 7183 if (unlikely(!map)) 7184 goto out; 7185 7186 if (map->phys_map[dest_id]->vcpu) { 7187 target = map->phys_map[dest_id]->vcpu; 7188 rcu_read_unlock(); 7189 kvm_vcpu_yield_to(target); 7190 } 7191 7192 out: > 7193 if (!target) 7194 rcu_read_unlock(); 7195 } 7196 7197 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu) 7198 { 7199 unsigned long nr, a0, a1, a2, a3, ret; 7200 int op_64_bit; 7201 7202 if (kvm_hv_hypercall_enabled(vcpu->kvm)) 7203 return kvm_hv_hypercall(vcpu); 7204 7205 nr = kvm_rax_read(vcpu); 7206 a0 = kvm_rbx_read(vcpu); 7207 a1 = kvm_rcx_read(vcpu); 7208 a2 = kvm_rdx_read(vcpu); 7209 a3 = kvm_rsi_read(vcpu); 7210 7211 trace_kvm_hypercall(nr, a0, a1, a2, a3); 7212 7213 op_64_bit = is_64_bit_mode(vcpu); 7214 if (!op_64_bit) { 7215 nr &= 0xFFFFFFFF; 7216 a0 &= 0xFFFFFFFF; 7217 a1 &= 0xFFFFFFFF; 7218 a2 &= 0xFFFFFFFF; 7219 a3 &= 0xFFFFFFFF; 7220 } 7221 7222 if (kvm_x86_ops->get_cpl(vcpu) != 0) { 7223 ret = -KVM_EPERM; 7224 goto out; 7225 } 7226 7227 switch (nr) { 7228 case KVM_HC_VAPIC_POLL_IRQ: 7229 ret = 0; 7230 break; 7231 case KVM_HC_KICK_CPU: 7232 kvm_pv_kick_cpu_op(vcpu->kvm, a0, a1); 7233 ret = 0; 7234 break; 7235 #ifdef CONFIG_X86_64 7236 case KVM_HC_CLOCK_PAIRING: 7237 ret = kvm_pv_clock_pairing(vcpu, a0, a1); 7238 break; 7239 #endif 7240 case KVM_HC_SEND_IPI: 7241 ret = kvm_pv_send_ipi(vcpu->kvm, a0, a1, a2, a3, op_64_bit); 7242 break; > 7243 case KVM_HC_SCHED_YIELD: 7244 kvm_sched_yield(vcpu->kvm, a0); 7245 ret = 0; 7246 break; 7247 default: 7248 ret = -KVM_ENOSYS; 7249 break; 7250 } 7251 out: 7252 if (!op_64_bit) 7253 ret = (u32)ret; 7254 kvm_rax_write(vcpu, ret); 7255 7256 ++vcpu->stat.hypercalls; 7257 return kvm_skip_emulated_instruction(vcpu); 7258 } 7259 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall); 7260 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
