On Fri, Feb 23, 2018 at 11:27:31PM +0100, Sebastian Andrzej Siewior wrote:
> @@ -4103,10 +4093,26 @@ static int irq_remapping_alloc(struct irq_domain
> *domain, unsigned int virq,
> return ret;
>
> if (info->type == X86_IRQ_ALLOC_TYPE_IOAPIC) {
> - if (get_irq_table(devid, true))
> + struct irq_remap_table *table;
> + struct amd_iommu *iommu;
> +
> + table = get_irq_table(devid);
> + if (table) {
> + if (!table->min_index) {
> + /*
> + * Keep the first 32 indexes free for IOAPIC
> + * interrupts.
> + */
> + table->min_index = 32;
> + iommu = amd_iommu_rlookup_table[devid];
> + for (i = 0; i < 32; ++i)
> + iommu->irte_ops->set_allocated(table,
> i);
> + }
I think this needs to be protected by the table->lock.
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