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iommu/vt-d: Allow DMA domain attaching to rmrr locked device 

We don't allow a device to be assigned to user level when it is locked
by any RMRR's. Hence, intel_iommu_attach_device() will return error if
a domain of type IOMMU_DOMAIN_UNMANAGED is about to attach to a device
locked by rmrr. But this doesn't apply to a domain of type other than
IOMMU_DOMAIN_UNMANAGED. This adds a check to fix this.

Fixes: fa954e6831 ("iommu/vt-d: Delegate the dma domain to upper layer")
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reported-and-tested-by: Qian Cai <cai@lca.pw>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2019-06-12 08:28:48 +08:00 committed by Joerg Roedel
parent 6a8c6748b9
commit 5679582c2f
1 changed files with 2 additions and 1 deletions
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3
drivers/iommu/intel-iommu.c
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@ -5167,7 +5167,8 @@ static int intel_iommu_attach_device(struct iommu_domain *domain,
{
int ret;
if (device_is_rmrr_locked(dev)) {
if (domain->type == IOMMU_DOMAIN_UNMANAGED &&
device_is_rmrr_locked(dev)) {
dev_warn(dev, "Device is ineligible for IOMMU domain attach due to platform RMRR requirement. Contact your platform vendor.\n");
return -EPERM;
}