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In current code, vpci do the pci enumartion and add pci devices to the context table of iommu. Need to enable iommu DMA address translation later than vpci init. Otherwise, in UEFI platform, there will be a shot time that address translation is enabled, but the context table is not setup. For the devices active in UEFI environment will have problem on address translation. Tracked-On: #3160 Signed-off-by: Binbin Wu <binbin.wu@intel.com> Acked-by: Anthony Xu <anthony.xu@intel.com>