[PATCH 00/13] KVM: arm64: selftests: Run selftests in VHE EL2

Oliver Upton
2025-09-17T21:20:59Z

I've been working on some MMU-related features that are unused by KVM
meaning they're somewhat annoying to test. Because of that, I found the
time / patience to port our existing selftests infrastructure over to
running in VHE EL2, opportunistically promoting tests when the stars
align.

Creating a VGIC is a hard requirement of enabling EL2 for a VM. As a
consequence of this, I need to eat my words from my earlier conversation
with Sean on this topic and hammer in a default VGICv3. This requires
some participation from the arch-neutral code given the ordering
constraints on vCPU and VGIC creation.

At the tail end of this series is a sanity test for EL2 but nothing is
actually running nested (yet). Despite that, running in EL2 has proven
valuable already as it has uncovered a bug [*].

This is all _very_ lightly tested on an M2 :) Applies to 6.17-rc4

[*]: https://lore.kernel.org/kvmarm/20250917203125.283116-1-oliver.upton@linux.dev/

Oliver Upton (13):
KVM: arm64: selftests: Provide kvm_arch_vm_post_create() in library
code
KVM: arm64: selftests: Initialize VGICv3 only once
KVM: arm64: selftests: Add helper to check for VGICv3 support
KVM: arm64: selftests: Add unsanitised helpers for VGICv3 creation
KVM: arm64: selftests: Create a VGICv3 for 'default' VMs
KVM: arm64: selftests: Alias EL1 registers to EL2 counterparts
KVM: arm64: selftests: Provide helper for getting default vCPU target
KVM: arm64: selftests: Select SMCCC conduit based on current EL
KVM: arm64: selftests: Use hyp timer IRQs when test runs at EL2
KVM: arm64: selftests: Use the vCPU attr for setting nr of PMU
counters
KVM: arm64: selftests: Initialize HCR_EL2
KVM: arm64: selftests: Enable EL2 by default
KVM: arm64: selftests: Add basic test for running in VHE EL2

tools/testing/selftests/kvm/Makefile.kvm | 1 +
.../testing/selftests/kvm/arm64/arch_timer.c | 13 +--
.../kvm/arm64/arch_timer_edge_cases.c | 13 +--
tools/testing/selftests/kvm/arm64/hello_el2.c | 58 ++++++++++++
.../testing/selftests/kvm/arm64/hypercalls.c | 2 +-
tools/testing/selftests/kvm/arm64/kvm-uuid.c | 2 +-
.../testing/selftests/kvm/arm64/no-vgic-v3.c | 2 +
tools/testing/selftests/kvm/arm64/psci_test.c | 13 +--
.../testing/selftests/kvm/arm64/set_id_regs.c | 20 ++--
.../selftests/kvm/arm64/smccc_filter.c | 17 +++-
tools/testing/selftests/kvm/arm64/vgic_init.c | 2 +
tools/testing/selftests/kvm/arm64/vgic_irq.c | 4 +-
.../selftests/kvm/arm64/vgic_lpi_stress.c | 8 +-
.../selftests/kvm/arm64/vpmu_counter_access.c | 75 +++++++--------
.../selftests/kvm/dirty_log_perf_test.c | 35 -------
tools/testing/selftests/kvm/dirty_log_test.c | 1 +
tools/testing/selftests/kvm/get-reg-list.c | 9 +-
.../selftests/kvm/include/arm64/arch_timer.h | 24 +++++
.../kvm/include/arm64/kvm_util_arch.h | 5 +-
.../selftests/kvm/include/arm64/processor.h | 73 +++++++++++++++
.../selftests/kvm/include/arm64/vgic.h | 3 +
.../testing/selftests/kvm/include/kvm_util.h | 7 +-
.../selftests/kvm/lib/arm64/processor.c | 91 ++++++++++++++++---
tools/testing/selftests/kvm/lib/arm64/vgic.c | 64 +++++++++----
tools/testing/selftests/kvm/lib/kvm_util.c | 15 ++-
.../testing/selftests/kvm/lib/x86/processor.c | 2 +-
tools/testing/selftests/kvm/s390/cmma_test.c | 2 +-
tools/testing/selftests/kvm/steal_time.c | 2 +-
28 files changed, 395 insertions(+), 168 deletions(-)
create mode 100644 tools/testing/selftests/kvm/arm64/hello_el2.c

base-commit: b320789d6883cc00ac78ce83bccbfe7ed58afcf0
--
2.47.3