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KVM: selftests: Verify vCPU migration during IRQ delivery in IRQ test

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Extend the eventfd IRQ test with a '-m' flag to have the test migrate the
target vCPU to a random physical CPU before triggering its interrupt, e.g.
to validate KVM's ability to update device posted IRQ routing.

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: pin one vCPU at a time to simplify things, use main()'s affinity]
Link: https://patch.msgid.link/20260626213534.3866178-19-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
David Matlack 2026-06-26 14:35:31 -07:00 committed by Sean Christopherson
parent 26fd1fb473
commit 6b9470baea
1 changed files with 16 additions and 3 deletions
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19
tools/testing/selftests/kvm/irq_test.c
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@ -157,13 +157,14 @@ static const char *probe_iommu_type(void)
static void help(const char *name)
{
printf("Usage: %s [-a] [-d <segment:bus:device.function>] [-e] [-h] [-i nr_irqs] [-n] [-t iommu_type]\n", name);
printf("Usage: %s [-a] [-d <segment:bus:device.function>] [-e] [-h] [-i nr_irqs] [-m] [-n] [-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("-i The number of IRQs to generate during the test\n");
printf("-m Pin target vCPU to random physical CPU before triggering interrupt\n");
printf("-n Deliver 50 percent of IRQs as non-maskable interrupts\n");
printf("-t Override the IOMMU type to use (vfio_type1_iommu or iommufd)\n");
printf("\n");
@ -195,12 +196,14 @@ int main(int argc, char **argv)
const char *device_bdf = NULL;
const char *iommu_type = NULL;
int i, j, c, msix, eventfd;
bool migrate_vcpus = false;
cpu_set_t available_cpus;
bool use_nmi = false;
struct iommu *iommu;
struct kvm_vm *vm;
int irq, irq_cpu;
while ((c = getopt(argc, argv, "ad:ehi:nt:")) != -1) {
while ((c = getopt(argc, argv, "ad:ehi:mnt:")) != -1) {
switch (c) {
case 'a':
irq_affinity = true;
@ -214,6 +217,9 @@ int main(int argc, char **argv)
case 'i':
nr_irqs = atoi_positive("Number of IRQs", optarg);
break;
case 'm':
migrate_vcpus = true;
break;
case 'n':
use_nmi = true;
break;
@ -248,7 +254,6 @@ int main(int argc, char **argv)
eventfd = kvm_new_eventfd();
irq = -1;
irq_cpu = -1;
}
pr_info("Injecting interrupts for GSI %d (guest vector 0x%x) %d times\n",
@ -256,6 +261,9 @@ int main(int argc, char **argv)
kvm_assign_irqfd(vm, gsi, eventfd);
if (migrate_vcpus)
kvm_sched_getaffinity(0, sizeof(available_cpus), &available_cpus);
for (i = 0; i < nr_vcpus; i++)
pthread_create(&vcpu_threads[i], NULL, vcpu_thread_main, vcpus[i]);
@ -266,6 +274,8 @@ int main(int argc, char **argv)
continue;
}
irq_cpu = -1;
for (i = 0; i < nr_irqs; i++) {
const bool do_set_empty_routing = set_empty_routing && (i & BIT(3));
const bool do_use_nmi = use_nmi && (i & BIT(2));
@ -282,6 +292,9 @@ int main(int argc, char **argv)
proc_irq_set_smp_affinity(irq, irq_cpu);
}
if (migrate_vcpus)
pin_task_to_random_cpu(vcpu_threads[i % nr_vcpus], &available_cpus);
for (j = 0; j < nr_vcpus; j++) {
TEST_ASSERT(!GUEST_RECEIVED_IRQ(vcpus[j]),
"IRQ flag for vCPU %d not clear prior to test",