[PATCH 5.17 063/343] kvm: selftests: aarch64: fix the failure check in kvm_set_gsi_routing_irqchip_check

[Greg Kroah-Hartman]

From: Ricardo Koller <ricarkol@xxxxxxxxxx>

[ Upstream commit 5b7898648f02083012900e48d063e51ccbdad165 ]

kvm_set_gsi_routing_irqchip_check(expect_failure=true) is used to check
the error code returned by the kernel when trying to setup an invalid
gsi routing table. The ioctl fails if "pin >= KVM_IRQCHIP_NUM_PINS", so
kvm_set_gsi_routing_irqchip_check() should test the error only when
"intid >= KVM_IRQCHIP_NUM_PINS+32". The issue is that the test check is
"intid >= KVM_IRQCHIP_NUM_PINS", so for a case like "intid =
KVM_IRQCHIP_NUM_PINS" the test wrongly assumes that the kernel will
return an error.  Fix this by using the right check.

Signed-off-by: Ricardo Koller <ricarkol@xxxxxxxxxx>
Reported-by: Reiji Watanabe <reijiw@xxxxxxxxxx>
Cc: Andrew Jones <drjones@xxxxxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220127030858.3269036-4-ricarkol@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 tools/testing/selftests/kvm/aarch64/vgic_irq.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/kvm/aarch64/vgic_irq.c b/tools/testing/selftests/kvm/aarch64/vgic_irq.c
index 7f3afee5cc00..48e43e24d240 100644
--- a/tools/testing/selftests/kvm/aarch64/vgic_irq.c
+++ b/tools/testing/selftests/kvm/aarch64/vgic_irq.c
@@ -573,8 +573,8 @@ static void kvm_set_gsi_routing_irqchip_check(struct kvm_vm *vm,
 		kvm_gsi_routing_write(vm, routing);
 	} else {
 		ret = _kvm_gsi_routing_write(vm, routing);
-		/* The kernel only checks for KVM_IRQCHIP_NUM_PINS. */
-		if (intid >= KVM_IRQCHIP_NUM_PINS)
+		/* The kernel only checks e->irqchip.pin >= KVM_IRQCHIP_NUM_PINS */
+		if (((uint64_t)intid + num - 1 - MIN_SPI) >= KVM_IRQCHIP_NUM_PINS)
 			TEST_ASSERT(ret != 0 && errno == EINVAL,
 				"Bad intid %u did not cause KVM_SET_GSI_ROUTING "
 				"error: rc: %i errno: %i", intid, ret, errno);
-- 
2.35.1