Commit e3560ee4 authored Jan 21, 2020 by Jon Derrick Committed by Bjorn Helgaas Jan 24, 2020

iommu/vt-d: Remove VMD child device sanity check

Remove the sanity check required for VMD child devices. The new
pci_real_dma_dev() DMA alias mechanism places them in the same IOMMU group
as the VMD endpoint. Assignment of the group would require assigning the
VMD endpoint, where unbinding the VMD endpoint removes the child device
domain from the hierarchy.

Link: https://lore.kernel.org/r/1579613871-301529-6-git-send-email-jonathan.derrick@intel.com

Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>

parent 2b0140c6

drivers/iommu/intel-iommu.c

+1 −9

Original line number	Diff line number	Diff line
		@@ -774,15 +774,7 @@ static struct intel_iommu device_to_iommu(struct device dev, u8 bus, u8 devf
		if (dev_is_pci(dev)) {
		struct pci_dev *pf_pdev;

		pdev = to_pci_dev(dev);

		#ifdef CONFIG_X86
		/* VMD child devices currently cannot be handled individually */
		if (is_vmd(pdev->bus))
		return NULL;
		#endif

		pdev = pci_real_dma_dev(pdev);
		pdev = pci_real_dma_dev(to_pci_dev(dev));

		/* VFs aren't listed in scope tables; we need to look up
		* the PF instead to find the IOMMU. */