diff options
| author | Sean Christopherson <seanjc@google.com> | 2026-06-26 14:35:17 -0700 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2026-07-07 11:24:43 -0700 |
| commit | bae85cd758fe30b3837c6dcfc0572db34aecea45 (patch) | |
| tree | 372cb664ec3a540594b050838bb823cb64205d7f /tools/testing | |
| parent | e0bd29eddf7ecdd67f28f3c44ad89b02a08f245c (diff) | |
KVM: selftests: Initialize the default/global pRNG during kvm_selftest_init()
Initialize the default kvm_rng during selftest initialization so that the
pRNG can be used by tests before creating a VM. As pointed out by Sashiko,
failure to actually initialize the generate makes it decidedly not random.
Link: https://patch.msgid.link/20260626213534.3866178-5-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'tools/testing')
| -rw-r--r-- | tools/testing/selftests/kvm/lib/kvm_util.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index 875030c22d07..1016865d3f7a 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -24,6 +24,13 @@ u32 kvm_random_seed; struct kvm_random_state kvm_rng; static u32 last_kvm_seed; +static void kvm_seed_rng(u32 seed) +{ + kvm_random_seed = last_kvm_seed = seed; + pr_info("Random seed: 0x%x\n", kvm_random_seed); + kvm_rng = new_kvm_random_state(kvm_random_seed); +} + static size_t vcpu_mmap_sz(void); int __open_path_or_exit(const char *path, int flags, const char *enoent_help) @@ -515,11 +522,9 @@ struct kvm_vm *__vm_create(struct vm_shape shape, u32 nr_runnable_vcpus, slot0 = memslot2region(vm, 0); ucall_init(vm, slot0->region.guest_phys_addr + slot0->region.memory_size); - if (kvm_random_seed != last_kvm_seed) { - pr_info("Random seed: 0x%x\n", kvm_random_seed); - last_kvm_seed = kvm_random_seed; - } - kvm_rng = new_kvm_random_state(kvm_random_seed); + if (kvm_random_seed != last_kvm_seed) + kvm_seed_rng(kvm_random_seed); + sync_global_to_guest(vm, kvm_rng); kvm_arch_vm_post_create(vm, nr_runnable_vcpus); @@ -2279,8 +2284,7 @@ void __attribute((constructor)) kvm_selftest_init(void) sigaction(SIGILL, &sig_sa, NULL); sigaction(SIGFPE, &sig_sa, NULL); - kvm_random_seed = last_kvm_seed = random(); - pr_info("Random seed: 0x%x\n", kvm_random_seed); + kvm_seed_rng(random()); kvm_selftest_arch_init(); } |