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Fri, 12 Jun 2026 17:20:50 -0700 (PDT) Date: Fri, 12 Jun 2026 17:20:23 -0700 In-Reply-To: <20260613002031.745413-1-seanjc@google.com> Mime-Version: 1.0 References: <20260613002031.745413-1-seanjc@google.com> X-Mailer: git-send-email 2.54.0.1136.gdb2ca164c4-goog Message-ID: <20260613002031.745413-13-seanjc@google.com> Subject: [PATCH v7 12/20] KVM: selftests: Add option to set empty routing between IRQs in eventfd IRQ test From: Sean Christopherson To: Paolo Bonzini , Marc Zyngier , Oliver Upton , Sean Christopherson Cc: Joey Gouly , Steffen Eiden , Suzuki K Poulose , Zenghui Yu , kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, David Matlack , Josh Hilke Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260612_172051_710563_6659C4F0 X-CRM114-Status: GOOD ( 14.37 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Sean Christopherson Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: David Matlack Extend the eventfd IRQ test with an '-e' flag to set empty GSI routing between interrupts. Clobbering the GSI routing table verifies that KVM correctly handles CPUx => NULL => CPUy transitions, not just CPUx => CPUy transitions, and verifies that KVM can "rebuild" an entire routing setup. Signed-off-by: David Matlack Co-developed-by: Josh Hilke Signed-off-by: Josh Hilke [sean: '-e' for "empty" instead of '-c' for "clear", massage changelog] Signed-off-by: Sean Christopherson --- tools/testing/selftests/kvm/irq_test.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/kvm/irq_test.c b/tools/testing/selftests/kvm/irq_test.c index c01aa313f719..2356912e2272 100644 --- a/tools/testing/selftests/kvm/irq_test.c +++ b/tools/testing/selftests/kvm/irq_test.c @@ -109,6 +109,13 @@ static void kvm_route_msi(struct kvm_vm *vm, u32 gsi, struct kvm_vcpu *vcpu, vm_ioctl(vm, KVM_SET_GSI_ROUTING, &routing.header); } +static void kvm_set_empty_gsi_routing(struct kvm_vm *vm) +{ + struct kvm_irq_routing routing = {}; + + vm_ioctl(vm, KVM_SET_GSI_ROUTING, &routing); +} + static const char *probe_iommu_type(void) { int io_fd; @@ -127,11 +134,12 @@ static const char *probe_iommu_type(void) static void help(const char *name) { - printf("Usage: %s [-a] [-d ] [-h] [-t iommu_type]\n", name); + printf("Usage: %s [-a] [-d ] [-e] [-h] [-t iommu_type]\n", name); printf("\n"); printf("Tests KVM interrupt routing and delivery via irqfd.\n"); printf("-a Affine the device's host IRQ to a random physical CPU\n"); printf("-d Use a VFIO device to send MSI-X interrupts instead of manually signaling the eventfd\n"); + printf("-e Set empty GSI routing in-between some interrupts\n"); printf("-t Override the IOMMU type to use (vfio_type1_iommu or iommufd)\n"); printf("\n"); exit(KSFT_FAIL); @@ -158,6 +166,7 @@ int main(int argc, char **argv) struct kvm_vcpu *vcpus[KVM_MAX_VCPUS]; struct vfio_pci_device *device = NULL; int nr_irqs = 1000, nr_vcpus = 1; + bool set_empty_routing = false; const char *device_bdf = NULL; const char *iommu_type = NULL; int i, j, c, msix, eventfd; @@ -165,7 +174,7 @@ int main(int argc, char **argv) struct kvm_vm *vm; int irq, irq_cpu; - while ((c = getopt(argc, argv, "ad:ht:")) != -1) { + while ((c = getopt(argc, argv, "ad:eht:")) != -1) { switch (c) { case 'a': irq_affinity = true; @@ -173,6 +182,9 @@ int main(int argc, char **argv) case 'd': device_bdf = optarg; break; + case 'e': + set_empty_routing = true; + break; case 't': iommu_type = optarg; break; @@ -223,9 +235,13 @@ int main(int argc, char **argv) irq_cpu = -1; for (i = 0; i < nr_irqs; i++) { + const bool do_set_empty_routing = set_empty_routing && (i & BIT(3)); struct kvm_vcpu *vcpu = vcpus[i % nr_vcpus]; struct timespec start; + if (do_set_empty_routing) + kvm_set_empty_gsi_routing(vm); + kvm_route_msi(vm, gsi, vcpu, vector); if (irq_affinity) { -- 2.54.0.1136.gdb2ca164c4-goog