iommu/amd: Enforce alignment for MSI IRQs

Make use of the new alignment capability of
alloc_irq_index() to enforce IRQ index alignment
for MSI.
Reported-by: NThomas Gleixner <tglx@linutronix.de>
Fixes: 2b324506 ('iommu/amd: Add routines to manage irq remapping tables')
Reviewed-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

drivers/iommu/amd_iommu.c

@@ -4102,7 +4102,9 @@ static int irq_remapping_alloc(struct irq_domain *domain, unsigned int virq,
 		else
 			ret = -ENOMEM;
 	} else {
-		index = alloc_irq_index(devid, nr_irqs, false);
+		bool align = (info->type == X86_IRQ_ALLOC_TYPE_MSI);
+
+		index = alloc_irq_index(devid, nr_irqs, align);
 	}
 	if (index < 0) {
 		pr_warn("Failed to allocate IRTE\n");