spdk use paddr=vaddr during iommu_map_dma

[fengggli]

spdk_register_io_memory only uses virtual address when vfio is available! it assumes virtual address and physical address are the same?

spdk/lib/env_dpdk/vtophys.c

Lines 363 to 375 in f14c7b3

	#if SPDK_VFIO_ENABLED
	if (g_vfio.enabled) {
	/* We'll use the virtual address as the iova. DPDK
	* currently uses physical addresses as the iovas (or counts
	* up from 0 if it can't get physical addresses), so
	* the range of user space virtual addresses and physical
	* addresses will never overlap.
	*/
	paddr = (uint64_t)vaddr;
	rc = vtophys_iommu_map_dma((uint64_t)vaddr, paddr, VALUE_2MB);
	if (rc) {
	return -EFAULT;
	}