1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/perf/arm_pmu_acpi.c b/drivers/perf/arm_pmu_acpi.c
index 34c862f213c7..0a9b78705ee8 100644
--- a/drivers/perf/arm_pmu_acpi.c
+++ b/drivers/perf/arm_pmu_acpi.c
@@ -29,6 +29,17 @@ static int arm_pmu_acpi_register_irq(int cpu)
                 return -EINVAL;
 
         gsi = gicc->performance_interrupt;
+
+        /*
+         * Per the ACPI spec, the MADT cannot describe a PMU that doesn't
+         * have an interrupt. QEMU advertises this by using a GSI of zero,
+         * which is not known to be valid on any hardware despite being
+         * valid per the spec. Take the pragmatic approach and reject a
+         * GSI of zero for now.
+         */
+        if (!gsi)
+                return 0;
+
         if (gicc->flags & ACPI_MADT_PERFORMANCE_IRQ_MODE)
                 trigger = ACPI_EDGE_SENSITIVE;
         else