[PATCH v3 09/15] KVM: selftests: Fix prefault_mem logic
From: James Houghton <hidden>
Date: 2025-06-18 04:24:41
Also in:
kvm, kvmarm, linux-doc, lkml
Subsystem:
kernel selftest framework, kernel virtual machine (kvm), the rest · Maintainers:
Shuah Khan, Paolo Bonzini, Linus Torvalds
The previous logic didn't handle the case where memory was partitioned AND we were using a single userfaultfd. It would only prefault the first vCPU's memory and not the rest. Signed-off-by: James Houghton <redacted> --- tools/testing/selftests/kvm/demand_paging_test.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/kvm/demand_paging_test.c b/tools/testing/selftests/kvm/demand_paging_test.c
index 0202b78f8680a..315f5c9037b40 100644
--- a/tools/testing/selftests/kvm/demand_paging_test.c
+++ b/tools/testing/selftests/kvm/demand_paging_test.c@@ -172,11 +172,13 @@ static void run_test(enum vm_guest_mode mode, void *arg) memset(guest_data_prototype, 0xAB, demand_paging_size); if (p->uffd_mode == UFFDIO_REGISTER_MODE_MINOR) { - num_uffds = p->single_uffd ? 1 : nr_vcpus; - for (i = 0; i < num_uffds; i++) { + for (i = 0; i < nr_vcpus; i++) { vcpu_args = &memstress_args.vcpu_args[i]; prefault_mem(addr_gpa2alias(vm, vcpu_args->gpa), vcpu_args->pages * memstress_args.guest_page_size); + if (!p->partition_vcpu_memory_access) + /* We prefaulted everything */ + break; } }
--
2.50.0.rc2.692.g299adb8693-goog