Messages in this thread Patch in this message | | | Subject | [PATCH v2 4/7] iommu/vt-d: Ignore domain parameter in attach_device if device requires identity map | From | James Sewart <> | Date | Thu, 14 Mar 2019 11:58:43 +0000 |
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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 <jamessewart@arista.com> --- 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"); + } + iommu = device_to_iommu(dev, &bus, &devfn); if (!iommu) return -ENODEV; -- 2.17.1
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