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: fa954e6831789 ("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>

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 03946dc..c31fbe5 100644 (file)
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -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;
        }