We don't need to migrate the irqs for VT-d Posted-Interrtups here. When 'pst' is set in IRTE, the associated irq will be posted to guests instead of interrupt remapping. The destination of the interrupt is set in Posted-Interrupts Descriptor, and the migration happens during VCPU scheduling. Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx> --- drivers/iommu/intel_irq_remapping.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c index 87c02fe..249e2b1 100644 --- a/drivers/iommu/intel_irq_remapping.c +++ b/drivers/iommu/intel_irq_remapping.c @@ -1038,6 +1038,13 @@ intel_ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask, if (get_irte(irq, &irte)) return -EBUSY; + /* + * If the interrupt is for posting, it is used by guests, + * we cannot change IRTE here. + */ + if (irte.irq_post_low.pst == 1) + return 0; + err = assign_irq_vector(irq, cfg, mask); if (err) return err; -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
