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

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Multiple Serial Port Passthrough in HVM domU
From: Trolle Selander <trolle.selander@xxxxxxxxx>
Date: Thu, 3 Jun 2010 18:47:26 -0400
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Hi Nick,

There's been several suggestions on how to handle multiple emulated
serial ports in the config file, but as far as I can tell from a quick
look at XendConfig.py, none of them have made it into the tree. It's
still doable, however - simply create a qemu-dm "wrapper" that adds
multiple -serial options to the qemu-dm commandline, and change the
device_model line to point to the wrapper.

-- Trolle

On Thu, Jun 3, 2010 at 6:38 PM, Nick Couchman <Nick.Couchman@xxxxxxxxx> wrote:
> 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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