iommu/smmuv3: Enforce incompatibility between nested mode and HW MSI regions

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I401IF


CVE: NA

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Nested mode currently is not compatible with HW MSI reserved regions.
Indeed MSI transactions targeting this MSI doorbells bypass the SMMU.

Let's check nested mode is not attempted in such configuration.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Kunkun <Jiang&lt;jiangkunkun@huawei.com>
Reviewed-by: Keqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>