From: Lu Baolu baolu.lu@linux.intel.com
commit 9235cb13d7d17baba0b3a9277381258361e95c16 upstream.
Since commit ea2447f700cab ("intel-iommu: Prevent devices with RMRRs from being placed into SI Domain"), the Intel IOMMU driver doesn't allow any devices with RMRR locked to use the identity domain. This was added to to fix the issue where the RMRR info for devices being placed in and out of the identity domain gets lost. This identity maps all RMRRs when setting up the identity domain, so that devices with RMRRs could also use it.
Signed-off-by: Lu Baolu baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel jroedel@suse.de Cc: Alan Stern stern@rowland.harvard.edu Cc: John Donnelly john.p.donnelly@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/iommu/intel-iommu.c | 15 ++------------- 1 file changed, 2 insertions(+), 13 deletions(-)
--- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -2762,10 +2762,8 @@ static int __init si_domain_init(int hw) }
/* - * Normally we use DMA domains for devices which have RMRRs. But we - * loose this requirement for graphic and usb devices. Identity map - * the RMRRs for graphic and USB devices so that they could use the - * si_domain. + * Identity map the RMRRs so that devices with RMRRs could also use + * the si_domain. */ for_each_rmrr_units(rmrr) { for_each_active_dev_scope(rmrr->devices, rmrr->devices_cnt, @@ -2773,9 +2771,6 @@ static int __init si_domain_init(int hw) unsigned long long start = rmrr->base_address; unsigned long long end = rmrr->end_address;
- if (device_is_rmrr_locked(dev)) - continue; - if (WARN_ON(end < start || end >> agaw_to_width(si_domain->agaw))) continue; @@ -2914,9 +2909,6 @@ static int device_def_domain_type(struct if (dev_is_pci(dev)) { struct pci_dev *pdev = to_pci_dev(dev);
- if (device_is_rmrr_locked(dev)) - return IOMMU_DOMAIN_DMA; - /* * Prevent any device marked as untrusted from getting * placed into the statically identity mapping domain. @@ -2954,9 +2946,6 @@ static int device_def_domain_type(struct return IOMMU_DOMAIN_DMA; } else if (pci_pcie_type(pdev) == PCI_EXP_TYPE_PCI_BRIDGE) return IOMMU_DOMAIN_DMA; - } else { - if (device_has_rmrr(dev)) - return IOMMU_DOMAIN_DMA; }
return (iommu_identity_mapping & IDENTMAP_ALL) ?