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iommu/vt-d: Allow devices with RMRRs to use identity domain 

Since commit ea2447f700 ("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>
This commit is contained in:
Lu Baolu 2020-01-15 11:03:58 +08:00 committed by Joerg Roedel
parent ce4cc52b51
commit 9235cb13d7
1 changed files with 2 additions and 13 deletions
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15
drivers/iommu/intel-iommu.c
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@ -2893,10 +2893,8 @@ 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,
@ -2904,9 +2902,6 @@ 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;
@ -3045,9 +3040,6 @@ static int device_def_domain_type(struct device *dev)
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.
@ -3085,9 +3077,6 @@ static int device_def_domain_type(struct device *dev)
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) ?