tree: https://git.kernel.org/pub/scm/virt/kvm/kvm.git queue head: 7ece9aac9c5c3732258067d7c2c0ee4cc4904f81 commit: c818f0629897b9638e6f4501ad83fca05bb7248a [48/53] kvm: x86: hyperv: guest->host event signaling via eventfd reproduce: # apt-get install sparse git checkout c818f0629897b9638e6f4501ad83fca05bb7248a make ARCH=x86_64 allmodconfig make C=1 CF=-D__CHECK_ENDIAN__ sparse warnings: (new ones prefixed by >>) >> arch/x86/kvm/hyperv.c:1252:21: sparse: constant 0xffff00000000 is so big it is long vim +1252 arch/x86/kvm/hyperv.c 1229 1230 static u16 kvm_hvcall_signal_event(struct kvm_vcpu *vcpu, bool fast, u64 param) 1231 { 1232 struct eventfd_ctx *eventfd; 1233 1234 if (unlikely(!fast)) { 1235 int ret; 1236 gpa_t gpa = param; 1237 1238 if ((gpa & (__alignof__(param) - 1)) || 1239 offset_in_page(gpa) + sizeof(param) > PAGE_SIZE) 1240 return HV_STATUS_INVALID_ALIGNMENT; 1241 1242 ret = kvm_vcpu_read_guest(vcpu, gpa, ¶m, sizeof(param)); 1243 if (ret < 0) 1244 return HV_STATUS_INVALID_ALIGNMENT; 1245 } 1246 1247 /* 1248 * Per spec, bits 32-47 contain the extra "flag number". However, we 1249 * have no use for it, and in all known usecases it is zero, so just 1250 * report lookup failure if it isn't. 1251 */ > 1252 if (param & 0xffff00000000) 1253 return HV_STATUS_INVALID_PORT_ID; 1254 /* remaining bits are reserved-zero */ 1255 if (param & ~KVM_HYPERV_CONN_ID_MASK) 1256 return HV_STATUS_INVALID_HYPERCALL_INPUT; 1257 1258 /* conn_to_evt is protected by vcpu->kvm->srcu */ 1259 eventfd = idr_find(&vcpu->kvm->arch.hyperv.conn_to_evt, param); 1260 if (!eventfd) 1261 return HV_STATUS_INVALID_PORT_ID; 1262 1263 eventfd_signal(eventfd, 1); 1264 return HV_STATUS_SUCCESS; 1265 } 1266 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
