Re: [libvirt] [PATCH 1/3 V7] add nodeGetCPUmap() for getting available CPU IDs in a cpumap.

+/* + * Linux maintains cpu bit map. For example, if cpuid=5's flag is not set + * and max cpu is 7. The map file shows 0-4,6-7. This function parses + * it and returns cpumap. + */ +static const char * +linuxParseCPUmap(int *max_cpuid, const char *path) +{ + char *map = NULL; + char *str = NULL; + int max_id, i; + + if (virFileReadAll(path, 5 * VIR_DOMAIN_CPUMASK_LEN, &str) < 0) { + virReportOOMError(); + goto error; + } + + if (VIR_ALLOC_N(map, VIR_DOMAIN_CPUMASK_LEN) < 0) { + virReportOOMError(); + goto error; + } + if (virDomainCpuSetParse(str, 0, map, + VIR_DOMAIN_CPUMASK_LEN) < 0) { + goto error; + } + + for (i = 0; i < VIR_DOMAIN_CPUMASK_LEN; i++) { + if (map[i]) { + max_id = i; + } + } + *max_cpuid = max_id;