[GIT PULL] KVM: x86: KVM: Selftests change for 7.3, part 2

From: Sean Christopherson

Date: Wed Aug 12 2026 - 17:36:16 EST

Selftests, part 2. This was originally just the irq_test from David and Josh,
but I piled on fixes for hardware_disable_test and pmu_counters_test that rely
on the pRNG changes/enhancements.

There have been a few hiccups with linking to the VFIO selfest library, but I
think they're all sorted out. I.e. this should Just Work on your end.

As mentioned in the cover letter, this will conflict with part 1. Part 2 just
adds syscall wrappers, i.e. keep the functional test changes from part 1, but
use the newfangled wrappers from part 2.

diff --cc tools/testing/selftests/kvm/steal_time.c
index 92e7ffcd68b7,83a1e3aa15cf..6e9cc0e34ec0
--- tools/testing/selftests/kvm/steal_time.c
+++ tools/testing/selftests/kvm/steal_time.c
@@@ -553,11 -553,7 +548,11 @@@ int main(int ac, char **av

/* Steal time from the VCPU. The steal time thread has the same CPU affinity as the VCPUs. */
run_delay = get_run_delay();
- pthread_create(&thread, NULL, do_steal_time, NULL);
- pthread_getaffinity_np(thread, sizeof(cpuset), &cpuset);
- kvm_pthread_create(&thread, &attr, do_steal_time, NULL);
++ kvm_pthread_create(&thread, NULL, do_steal_time, NULL);
++ kvm_pthread_getaffinity_np(thread, sizeof(cpuset), &cpuset);
+ TEST_ASSERT(CPU_COUNT(&cpuset) == 1 && CPU_ISSET(cpu, &cpuset),
+ "Worker failed to inherit parent's CPU affinity");
+
do
sched_yield();
while (get_run_delay() - run_delay < MIN_RUN_DELAY_NS);

The following changes since commit 8cdeaa50eae8dad34885515f62559ee83e7e8dda:

Linux 7.2-rc2 (2026-07-05 14:44:06 -1000)

are available in the Git repository at:

https://github.com/kvm-x86/linux.git tags/kvm-x86-selftests2-7.3

for you to fetch changes up to 4fe8b4e1545a0179ceebe098cce0dcfe9134a6cd:

KVM: selftests: Create one VM with many vCPUs for each major PMU counters test (2026-08-10 08:04:13 -0700)

----------------------------------------------------------------
KVM selftests changes for 7.3, part 2

- Fix several issues with seeding KVM's pRNG, and rework the pRNG APIs to that
the pRNG can be sanely used in host code, not just guest code.

- Add an IRQ test to validate virtual IRQ deliverty for IRQs wired up via
KVM_IRQFD + KVM_SET_GSI_ROUTING, with optional support for triggering IRQs
via writes to an assigned VFIO device.

- Add syscall wrappers to assert success on a variety of pthreads and CPU
affinity APIs.

- Set vCPU pthread affinity as early as possible to reduce contention issues
that were surfaced by PREEMPT_LAZY, which result in runtimes of over a
minute on large hosts, versus the expected ~5 seconds.

- Rework the PMU counters test to run each testcase using a single VM with
many vCPUs for each sub-testcase, instead of using a unique VM for each
sub-testcase. This cuts the runtime by ~20x.

----------------------------------------------------------------
David Matlack (11):
KVM: selftests: Build and link selftests/vfio/lib into KVM selftests
KVM: selftests: Add macros to read/write+sync to/from guest memory
KVM: selftests: Add an irqfd send+receive (and later IRQ bypass) test
KVM: selftests: Add helper to get host IRQ from device MSI-X for IRQ bypass test
KVM: selftests: Add VFIO device support to eventfd IRQ test
KVM: selftests: Verify interrupts are received when IRQ affinity changes in IRQ test
KVM: selftests: Add option to set empty routing between IRQs in eventfd IRQ test
KVM: selftests: Make number of IRQs configurable in IRQ test
KVM: selftests: Verify vCPU migration during IRQ delivery in IRQ test
KVM: selftests: Make number of vCPUs configurable in IRQ test
KVM: selftests: Add xAPIC support in eventfd IRQ test

Josh Hilke (6):
KVM: selftests: Rename guest_rng to kvm_rng
KVM: selftests: Add helper to generate random u64 in range [min,max]
KVM: selftests: Add a helper to set proc IRQ affinity for IRQ test
KVM: selftests: Add kvm_gettid() wrapper and convert users
KVM: selftests: Add kvm_sched_getaffinity() wrapper and convert users
KVM: selftests: Add a utility to pin a task to a random CPU, given a CPU set

Sean Christopherson (18):
KVM: selftests: Initialize the default/global pRNG during kvm_selftest_init()
KVM: selftests: Seed libc's RNG before using it to generate a seed for KVM's pRNG
KVM: selftests: Verify non-postable IRQ remapping in IRQ test
KVM: selftests: Only link to VFIO library on x86
KVM: selftests: Add a KVM syscall wrapper for sched_setaffinity()
KVM: selftests: Set threads CPU affinity before doing work in hardware disable test
KVM: selftests: Pre-set threads affinity in hardware disable test when possible
KVM: selftests: Return the target CPU from pin_task_to_random_cpu()
KVM: selftests: Extract picking of random CPU from cpu_set_t to separate API
KVM: selftests: Affine threads to random CPUs in hardware disable test
KVM: selftests: Drop unreachable, dead code from hardware disable test
KVM: selftests: Add KVM syscall wrapper for pthread_create()
KVM: selftests: Add KVM syscall wrappers for pthread_{cancel,join}()
KVM: selftests: Add helper APIs to cancel+join pthreads
KVM: selftests: Clean up global constants in hardware disable test
KVM: selftests: Add KVM syscall wrappers for pthread_{g,s}etaffinity_np()
KVM: selftests: Test one random GP counter in PMU arch events testcase
KVM: selftests: Create one VM with many vCPUs for each major PMU counters test

tools/testing/selftests/kvm/Makefile.kvm | 12 +++-
tools/testing/selftests/kvm/arch_timer.c | 20 ++----
tools/testing/selftests/kvm/arm64/arch_timer_edge_cases.c | 2 +-
tools/testing/selftests/kvm/arm64/vgic_irq.c | 14 ++--
tools/testing/selftests/kvm/arm64/vgic_lpi_stress.c | 8 +--
tools/testing/selftests/kvm/demand_paging_test.c | 2 +-
tools/testing/selftests/kvm/dirty_log_perf_test.c | 4 +-
tools/testing/selftests/kvm/dirty_log_test.c | 15 ++---
tools/testing/selftests/kvm/hardware_disable_test.c | 109 ++++++++++++++-----------------
tools/testing/selftests/kvm/include/kvm_syscalls.h | 55 ++++++++++++++++
tools/testing/selftests/kvm/include/kvm_util.h | 21 ++++++
tools/testing/selftests/kvm/include/proc_util.h | 11 ++++
tools/testing/selftests/kvm/include/test_util.h | 25 +++----
tools/testing/selftests/kvm/include/x86/kvm_util_arch.h | 4 +-
tools/testing/selftests/kvm/irq_test.c | 362 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
tools/testing/selftests/kvm/irqfd_test.c | 4 +-
tools/testing/selftests/kvm/kvm_page_table_test.c | 6 +-
tools/testing/selftests/kvm/lib/assert.c | 8 +--
tools/testing/selftests/kvm/lib/kvm_util.c | 52 +++++++++++----
tools/testing/selftests/kvm/lib/memstress.c | 12 ++--
tools/testing/selftests/kvm/lib/proc_util.c | 54 ++++++++++++++++
tools/testing/selftests/kvm/lib/test_util.c | 41 ++++++++++--
tools/testing/selftests/kvm/lib/userfaultfd_util.c | 7 +-
tools/testing/selftests/kvm/memslot_perf_test.c | 4 +-
tools/testing/selftests/kvm/mmu_stress_test.c | 19 ++----
tools/testing/selftests/kvm/pre_fault_memory_test.c | 4 +-
tools/testing/selftests/kvm/rseq_test.c | 16 ++---
tools/testing/selftests/kvm/s390/memop.c | 4 +-
tools/testing/selftests/kvm/set_memory_region_test.c | 6 +-
tools/testing/selftests/kvm/steal_time.c | 26 +++-----
tools/testing/selftests/kvm/x86/hyperv_ipi.c | 32 ++-------
tools/testing/selftests/kvm/x86/hyperv_tlb_flush.c | 30 ++-------
tools/testing/selftests/kvm/x86/pmu_counters_test.c | 227 ++++++++++++++++++++++++++++++++++++----------------------------
tools/testing/selftests/kvm/x86/private_mem_conversions_test.c | 4 +-
tools/testing/selftests/kvm/x86/private_mem_kvm_exits_test.c | 7 +-
tools/testing/selftests/kvm/x86/recalc_apic_map_test.c | 5 +-
tools/testing/selftests/kvm/x86/sev_dbg_test.c | 2 +-
tools/testing/selftests/kvm/x86/sev_migrate_tests.c | 4 +-
tools/testing/selftests/kvm/x86/sync_regs_test.c | 5 +-
tools/testing/selftests/kvm/x86/tsc_scaling_sync.c | 4 +-
tools/testing/selftests/kvm/x86/xapic_ipi_test.c | 31 ++-------
tools/testing/selftests/kvm/x86/xen_shinfo_test.c | 10 +--
42 files changed, 883 insertions(+), 405 deletions(-)
create mode 100644 tools/testing/selftests/kvm/include/proc_util.h
create mode 100644 tools/testing/selftests/kvm/irq_test.c
create mode 100644 tools/testing/selftests/kvm/lib/proc_util.c