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KVM: selftests: Initialize the default/global pRNG during kvm_selftest_init()

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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>
This commit is contained in:
Sean Christopherson 2026-06-26 14:35:17 -07:00
parent e0bd29eddf
commit bae85cd758
1 changed files with 11 additions and 7 deletions
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18
tools/testing/selftests/kvm/lib/kvm_util.c
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@ -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();
}