Messages in this thread Patch in this message | | | From | Feng Wu <> | Subject | [PATCH 12/13] iommu/vt-d: No need to migrating irq for VT-d Posted-Interrtups | Date | Mon, 10 Nov 2014 14:26:51 +0800 |
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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@intel.com> --- 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
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