'why 32bit msi pci device can work with arm64 64bit msi controller without iommu?
I have a marvell sata card,which support 32bit-msi only and without msix capability. It works well in system where msi controller(gic its translater) address is 64bit,os is linux,kernel version 4.4.65.
No matter I enable iommu or not,it always works,my method to disable iommu is remove all the iommu and smmu config in os and then remake os.
I cannot understand this,when sata controller send a memory write tlp to trigger interrupt,address within tlp is incomplete becase it only support 32bit-msi.During init stage,only lo 32 bit of msi controller address stored in sata card reg.
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