vmxnet3: Fix reading/writing guest memory specially when behind an IOMMU

vmxnet3: Fix reading/writing guest memory specially when behind an IOMMU

When a PCI device lives behind an IOMMU, it should use 'pci_dma_*' family of
functions when any transfer from/to guest memory is required while
'cpu_physical_memory_*' family of functions completely bypass any MMU/IOMMU in
the system.

vmxnet3 in some places was using 'cpu_physical_memory_*' family of functions
which works fine with the default QEMU setup where IOMMU is not enabled but
fails miserably when IOMMU is enabled. This commit converts all such instances
in favor of 'pci_dma_*'

Cc: Dmitry Fleytman <[email protected]>
Cc: Jason Wang <[email protected]>
Cc: [email protected]
Cc: Anthony Liguori <[email protected]>
Signed-off-by: KarimAllah Ahmed <[email protected]>
Acked-by: Dmitry Fleytman <[email protected]>
Signed-off-by: Jason Wang <[email protected]>