1 // SPDX-License-Identifier: GPL-2.0-only
14  * kvm_stats_read() - Common function to read from the binary statistics
28  * +-------------+
30  * +-------------+
32  * +-------------+
34  * +-------------+
36  * +-------------+
41  *    and some other necessary information. This is a one-time work for the
43  * 2. Read id string from its offset. This is a one-time work for the lifecycle
46  *    descriptors. This is a one-time work for the lifecycle of the
57 	ssize_t len;  in kvm_stats_read()  local
67 	size_desc = header->num_desc * sizeof(*desc);  in kvm_stats_read()
69 	len = KVM_STATS_NAME_SIZE + size_header + size_desc + size_stats - pos;  in kvm_stats_read()
70 	len = min(len, remain);  in kvm_stats_read()
71 	if (len <= 0)  in kvm_stats_read()
73 	remain = len;  in kvm_stats_read()
83 	copylen = size_header - pos;  in kvm_stats_read()
84 	copylen = min(copylen, remain);  in kvm_stats_read()
88 			return -EFAULT;  in kvm_stats_read()
89 		remain -= copylen;  in kvm_stats_read()
103 	copylen = header->id_offset + KVM_STATS_NAME_SIZE - pos;  in kvm_stats_read()
104 	copylen = min(copylen, remain);  in kvm_stats_read()
106 		src = id + pos - header->id_offset;  in kvm_stats_read()
108 			return -EFAULT;  in kvm_stats_read()
109 		remain -= copylen;  in kvm_stats_read()
119 	 * (header->header.desc_offset + size_desc) causing copylen <= 0.  in kvm_stats_read()
121 	copylen = header->desc_offset + size_desc - pos;  in kvm_stats_read()
122 	copylen = min(copylen, remain);  in kvm_stats_read()
124 		src = (void *)desc + pos - header->desc_offset;  in kvm_stats_read()
126 			return -EFAULT;  in kvm_stats_read()
127 		remain -= copylen;  in kvm_stats_read()
133 	copylen = header->data_offset + size_stats - pos;  in kvm_stats_read()
134 	copylen = min(copylen, remain);  in kvm_stats_read()
136 		src = stats + pos - header->data_offset;  in kvm_stats_read()
138 			return -EFAULT;  in kvm_stats_read()
143 	return len;  in kvm_stats_read()