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Commit ea2447f7 authored by Tom Mingarelli's avatar Tom Mingarelli Committed by Joerg Roedel
Browse files

intel-iommu: Prevent devices with RMRRs from being placed into SI Domain 



This patch is to prevent non-USB devices that have RMRRs associated with them from
being placed into the SI Domain during init. This fixes the issue where the RMRR info
for devices being placed in and out of the SI Domain gets lost.

Signed-off-by: default avatarThomas Mingarelli <thomas.mingarelli@hp.com>
Tested-by: default avatarShuah Khan <shuah.khan@hp.com>
Reviewed-by: default avatarDonald Dutile <ddutile@redhat.com>
Reviewed-by: default avatarAlex Williamson <alex.williamson@redhat.com>
Signed-off-by: default avatarJoerg Roedel <joro@8bytes.org>
parent f4a75d2e

drivers/iommu/intel-iommu.c

+31 −0
Original line number Original line Diff line number Diff line
@@ -2320,8 +2320,39 @@ static int domain_add_dev_info(struct dmar_domain *domain, 
	return 0;

	return 0;

}

}





static bool device_has_rmrr(struct pci_dev *dev)

{

	struct dmar_rmrr_unit *rmrr;

	int i;



	for_each_rmrr_units(rmrr) {

		for (i = 0; i < rmrr->devices_cnt; i++) {

			/*

			 * Return TRUE if this RMRR contains the device that

			 * is passed in.

			 */

			if (rmrr->devices[i] == dev)

				return true;

		}

	}

	return false;

}



static int iommu_should_identity_map(struct pci_dev *pdev, int startup)

static int iommu_should_identity_map(struct pci_dev *pdev, int startup)

{

{



	/*

	 * We want to prevent any device associated with an RMRR from

	 * getting placed into the SI Domain. This is done because

	 * problems exist when devices are moved in and out of domains

	 * and their respective RMRR info is lost. We exempt USB devices

	 * from this process due to their usage of RMRRs that are known

	 * to not be needed after BIOS hand-off to OS.

	 */

	if (device_has_rmrr(pdev) &&

	    (pdev->class >> 8) != PCI_CLASS_SERIAL_USB)

		return 0;



	if ((iommu_identity_mapping & IDENTMAP_AZALIA) && IS_AZALIA(pdev))

	if ((iommu_identity_mapping & IDENTMAP_AZALIA) && IS_AZALIA(pdev))

		return 1;

		return 1;