diff options
Diffstat (limited to 'tools/testing/selftests/kvm/lib/kvm_util.c')
| -rw-r--r-- | tools/testing/selftests/kvm/lib/kvm_util.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index f1cb1627161f..3b7710fb3784 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -11,6 +11,7 @@ #include "processor.h" #include <assert.h> +#include <sched.h> #include <sys/mman.h> #include <sys/types.h> #include <sys/stat.h> @@ -443,6 +444,59 @@ struct kvm_vcpu *vm_recreate_with_one_vcpu(struct kvm_vm *vm) return vm_vcpu_recreate(vm, 0); } +void kvm_pin_this_task_to_pcpu(uint32_t pcpu) +{ + cpu_set_t mask; + int r; + + CPU_ZERO(&mask); + CPU_SET(pcpu, &mask); + r = sched_setaffinity(0, sizeof(mask), &mask); + TEST_ASSERT(!r, "sched_setaffinity() failed for pCPU '%u'.\n", pcpu); +} + +static uint32_t parse_pcpu(const char *cpu_str, const cpu_set_t *allowed_mask) +{ + uint32_t pcpu = atoi_non_negative("CPU number", cpu_str); + + TEST_ASSERT(CPU_ISSET(pcpu, allowed_mask), + "Not allowed to run on pCPU '%d', check cgroups?\n", pcpu); + return pcpu; +} + +void kvm_parse_vcpu_pinning(const char *pcpus_string, uint32_t vcpu_to_pcpu[], + int nr_vcpus) +{ + cpu_set_t allowed_mask; + char *cpu, *cpu_list; + char delim[2] = ","; + int i, r; + + cpu_list = strdup(pcpus_string); + TEST_ASSERT(cpu_list, "strdup() allocation failed.\n"); + + r = sched_getaffinity(0, sizeof(allowed_mask), &allowed_mask); + TEST_ASSERT(!r, "sched_getaffinity() failed"); + + cpu = strtok(cpu_list, delim); + + /* 1. Get all pcpus for vcpus. */ + for (i = 0; i < nr_vcpus; i++) { + TEST_ASSERT(cpu, "pCPU not provided for vCPU '%d'\n", i); + vcpu_to_pcpu[i] = parse_pcpu(cpu, &allowed_mask); + cpu = strtok(NULL, delim); + } + + /* 2. Check if the main worker needs to be pinned. */ + if (cpu) { + kvm_pin_this_task_to_pcpu(parse_pcpu(cpu, &allowed_mask)); + cpu = strtok(NULL, delim); + } + + TEST_ASSERT(!cpu, "pCPU list contains trailing garbage characters '%s'", cpu); + free(cpu_list); +} + /* * Userspace Memory Region Find * |