On Thu, Jan 05 2023 at 15:33, Jason Gunthorpe wrote: > On x86 platforms when the HW can support interrupt remapping the iommu > driver creates an irq_domain for the IR hardware and creates a child MSI > irq_domain. > > When the global irq_remapping_enabled is set, the IR MSI domain is > assigned to the PCI devices (by intel_irq_remap_add_device(), or > amd_iommu_set_pci_msi_domain()) making those devices have the isolated MSI > property. > > Due to how interrupt domains work, setting IRQ_DOMAIN_FLAG_ISOLATED_MSI on > the parent IR domain will cause all struct devices attached to it to > return true from msi_device_has_isolated_msi(). This replaces the > IOMMU_CAP_INTR_REMAP flag as all places using IOMMU_CAP_INTR_REMAP also > call msi_device_has_isolated_msi() > > Set the flag and delete the cap. > > Tested-by: Matthew Rosato <mjrosato@xxxxxxxxxxxxx> > Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx> > Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx> Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
