[Xen-users] Multiple Serial Port Passthrough in HVM domU

["Nick Couchman" <Nick.Couchman@xxxxxxxxx>]

So, I made a mistake a bought four systems with the Intel Core i3 processors, 
without doing my homework to make sure that these systems actually supported 
VTd.  Turns out there's plenty of information out there indicating that the 
Core i3 processors do *not* support VTd.  I was counting on VTd for two 
applications: Graphics Passthrough and passing through a PCIe 4-port serial 
card.  Of course, graphics passthrough with these systems is now completely out 
of the question - that definitely requires VTd, and, short of purchasing 4 
upgraded processors, I don't have a way of making these systems support VTd.  
However, I'm hoping there's still a way for the serial port passthrough to 
work.  I know there are two methods for serial port passthrough:

serial = /dev/ttyS0

and

irq=4
ioports=[range1,range2,etc]

Two questions: first, with the first method above, is there any way to pass 
through more than one serial port?  Second, with the second method, is there 
any way to pass through serial port cards that don't have traditional I/O 
ranges, but, instead, only seem to support MMIO? If I look in /proc/ioports, I 
see my on-board serial port listed, but nothing about the PCIe add-in card.  
dmesg output shows:

[   13.972625] ttyS4: detected caps 00000700 should be 00000100
[   13.972632] 0000:04:00.0: ttyS4 at MMIO 0xdf1fd000 (irq = 16) is a 16C950/954
[   13.972743] ttyS5: detected caps 00000700 should be 00000100
[   13.972750] 0000:04:00.0: ttyS5 at MMIO 0xdf1fd200 (irq = 16) is a 16C950/954
[   13.972849] ttyS6: detected caps 00000700 should be 00000100
[   13.972856] 0000:04:00.0: ttyS6 at MMIO 0xdf1fd400 (irq = 16) is a 16C950/954
[   13.972952] ttyS7: detected caps 00000700 should be 00000100
[   13.972959] 0000:04:00.0: ttyS7 at MMIO 0xdf1fd600 (irq = 16) is a 16C950/954

If I do lspci -v and look at the card, I see:

04:00.0 Serial controller: Oxford Semiconductor Ltd Device c208 (prog-if 06 
[16950])
    Subsystem: Siig Inc Device 2250
    Flags: bus master, fast devsel, latency 0, IRQ 16
    Memory at df1fc000 (32-bit, non-prefetchable) [size=16K]
    Memory at df200000 (32-bit, non-prefetchable) [size=2M]
    Memory at df400000 (32-bit, non-prefetchable) [size=2M]
    Capabilities: [40] Power Management version 3
    Capabilities: [70] Express Endpoint, MSI 00
    Capabilities: [b0] MSI-X: Enable- Count=16 Masked-
    Capabilities: [100] Device Serial Number 00-30-e0-11-11-00-02-00
    Capabilities: [110] Power Budgeting 
    Kernel driver in use: serial

So, any hints - any way to make this work?

Thanks!
-Nick



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