Hi,
On 3/14/19 7:58 PM, James Sewart wrote:
If a device requires an identity map then it is not safe to attach a
domain that can remap addresses. Warn the user if this occurs.
Signed-off-by: James Sewart <[email protected]>
---
drivers/iommu/intel-iommu.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 2e00e8708f06..104d36f225a7 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5101,6 +5101,11 @@ static int intel_iommu_attach_device(struct iommu_domain
*domain,
}
}
+ if (iommu_no_mapping(dev)) {
+ dmar_domain = si_domain;
+ dev_warn(dev, "VT-d: Device is required to use identity IOMMU
mapping, ignoring domain attached\n");
+ }
This is awful. :-)
IOMMU generic layer allocated a @domain and tries to bind the @domain
with a device. This code replaces @domain with si_domain without
notifying the upper layer.
Best regards,
Lu Baolu
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