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KVM: selftests: Add option to set empty routing between IRQs in eventfd IRQ test

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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 <dmatlack@google.com>
Co-developed-by: Josh Hilke <jrhilke@google.com>
Signed-off-by: Josh Hilke <jrhilke@google.com>
[sean: '-e' for "empty" instead of '-c' for "clear", massage changelog]
Link: https://patch.msgid.link/20260626213534.3866178-13-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
David Matlack 2026-06-26 14:35:25 -07:00 committed by Sean Christopherson
parent 197b0cd9ac
commit ec333e3ace
1 changed files with 18 additions and 2 deletions
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20
tools/testing/selftests/kvm/irq_test.c
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@ -121,6 +121,13 @@ 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;
@ -139,11 +146,12 @@ static const char *probe_iommu_type(void)
static void help(const char *name)
{
printf("Usage: %s [-a] [-d <segment:bus:device.function>] [-h] [-t iommu_type]\n", name);
printf("Usage: %s [-a] [-d <segment:bus:device.function>] [-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);
@ -170,6 +178,7 @@ 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;
@ -177,7 +186,7 @@ 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;
@ -185,6 +194,9 @@ 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;
@ -234,9 +246,13 @@ int main(int argc, char **argv)
}
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) {