From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
Marc Zyngier <maz@kernel.org>, Oliver Upton <oupton@kernel.org>,
Sean Christopherson <seanjc@google.com>
Cc: Joey Gouly <joey.gouly@arm.com>,
Steffen Eiden <seiden@linux.ibm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org,
David Matlack <dmatlack@google.com>,
Josh Hilke <jrhilke@google.com>
Subject: [PATCH v7 05/20] KVM: selftests: Seed libc's RNG before using it to generate a seed for KVM's pRNG
Date: Fri, 12 Jun 2026 17:20:16 -0700 [thread overview]
Message-ID: <20260613002031.745413-6-seanjc@google.com> (raw)
In-Reply-To: <20260613002031.745413-1-seanjc@google.com>
Seed the RNG used by random() using the de facto standard method of
srand(time(0)), so that a different seed is actually used in each test run.
E.g. without seeding the RNG, literally every test on x86 will use
0x6b8b4567 to seed the KVM RNG.
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
tools/testing/selftests/kvm/lib/kvm_util.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 1016865d3f7a..2e08d9fcefc7 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -2284,6 +2284,7 @@ void __attribute((constructor)) kvm_selftest_init(void)
sigaction(SIGILL, &sig_sa, NULL);
sigaction(SIGFPE, &sig_sa, NULL);
+ srandom(time(0));
kvm_seed_rng(random());
kvm_selftest_arch_init();
--
2.54.0.1136.gdb2ca164c4-goog
next prev parent reply other threads:[~2026-06-13 0:20 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-13 0:20 [PATCH v7 00/20] KVM: selftests: Add eventfd+VFIO IRQ test Sean Christopherson
2026-06-13 0:20 ` [PATCH v7 01/20] KVM: selftests: Build and link selftests/vfio/lib into KVM selftests Sean Christopherson
2026-06-13 0:20 ` [PATCH v7 02/20] KVM: selftests: Add macros to read/write+sync to/from guest memory Sean Christopherson
2026-06-13 0:20 ` [PATCH v7 03/20] KVM: selftests: Rename guest_rng to kvm_rng Sean Christopherson
2026-06-13 0:20 ` [PATCH v7 04/20] KVM: selftests: Initialize the default/global pRNG during kvm_selftest_init() Sean Christopherson
2026-06-13 0:20 ` Sean Christopherson [this message]
2026-06-13 0:20 ` [PATCH v7 06/20] KVM: selftests: Add helper to generate random u64 in range [min,max] Sean Christopherson
2026-06-13 0:20 ` [PATCH v7 07/20] KVM: selftests: Add an irqfd send+receive (and later IRQ bypass) test Sean Christopherson
2026-06-13 0:20 ` [PATCH v7 08/20] KVM: selftests: Add helper to get host IRQ from device MSI-X for IRQ bypass test Sean Christopherson
2026-06-13 0:20 ` [PATCH v7 09/20] KVM: selftests: Add VFIO device support to eventfd IRQ test Sean Christopherson
2026-06-18 20:21 ` David Matlack
2026-06-18 21:42 ` Sean Christopherson
2026-06-13 0:20 ` [PATCH v7 10/20] KVM: selftests: Add a helper to set proc IRQ affinity for " Sean Christopherson
2026-06-13 0:20 ` [PATCH v7 11/20] KVM: selftests: Verify interrupts are received when IRQ affinity changes in " Sean Christopherson
2026-06-13 0:20 ` [PATCH v7 12/20] KVM: selftests: Add option to set empty routing between IRQs in eventfd " Sean Christopherson
2026-06-13 0:20 ` [PATCH v7 13/20] KVM: selftests: Make number of IRQs configurable in " Sean Christopherson
2026-06-13 0:20 ` [PATCH v7 14/20] KVM: selftests: Verify non-postable IRQ remapping " Sean Christopherson
2026-06-13 0:20 ` [PATCH v7 15/20] KVM: selftests: Add kvm_gettid() wrapper and convert users Sean Christopherson
2026-06-13 0:20 ` [PATCH v7 16/20] KVM: selftests: Add kvm_sched_getaffinity() " Sean Christopherson
2026-06-13 0:20 ` [PATCH v7 17/20] KVM: selftests: Add a utility to pin a task to a random CPU, given a CPU set Sean Christopherson
2026-06-13 0:20 ` [PATCH v7 18/20] KVM: selftests: Verify vCPU migration during IRQ delivery in IRQ test Sean Christopherson
2026-06-13 0:20 ` [PATCH v7 19/20] KVM: selftests: Make number of vCPUs configurable " Sean Christopherson
2026-06-13 0:20 ` [PATCH v7 20/20] KVM: selftests: Add xAPIC support in eventfd " Sean Christopherson
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