Hi Jacob, Baolu,
On Fri, Jan 28, 2022 at 11:10:01AM +0800, Lu Baolu wrote:
> During PCI bus rescan, adding new devices involve two notifiers.
> 1. dmar_pci_bus_notifier()
> 2. iommu_bus_notifier()
> The current code sets #1 as low priority (INT_MIN) which resulted in #2
> being invoked first. The result is that struct device pointer cannot be
> found in DRHD search for the new device's DMAR/IOMMU. Subsequently, the
> device is put under the "catch-all" IOMMU instead of the correct one.
There are actually iommu_ops pointers invoked from iommu_bus_notifier()
into IOMMU driver code. Can those be used to enforce the ordering in a
more reliable way?
Regards,
Joerg
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