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Re: [Xen-users] Marvell, IOMMU/VT-d, and pci-phantom

On Tue, 2013-06-25 at 21:05 +0200, Erlend Hoel wrote:
> Hi, guys.
> I've been trying to use the pci-phantom command line options to xen so
> as to work around the hardware issue with the Marvell 88SE91xx SATA
> controllers in IOMMU ([Intel:] VT-d) mode, but I cannot seem to get my
> head around it.  From having had a glance here:
>     http://xenbits.xen.org/docs/unstable/misc/xen-command-line.html
> and in particular the syntax described as such:
>     pci-phantom
>         =[<seg>:]<bus>:<device>,<stride>
> I decided to try and work out the correct values for this command.
> Being no expert (nor even an adept) when it comes to PCI bus
> addressing, I did this:
>     mybox:~$ lspci | grep -i marvell
>     06:00.0 SATA controller: Marvell Technology Group Ltd. 88SE9172
> SATA 6Gb/s Controller (rev 11)
>     0a:00.0 SATA controller: Marvell Technology Group Ltd. 88SE9172
> SATA 6Gb/s Controller (rev 11)
> and then experimented like so:
>     /boot/xen-4.3-unstable.gz placeholder pci-phantom=06:00.0 
> pci-phantom=0a:00.0
>     /boot/xen-4.3-unstable.gz placeholder pci-phantom=06:00,0 
> pci-phantom=0a:00,0
>     /boot/xen-4.3-unstable.gz placeholder pci-phantom=0:06:00,0 
> pci-phantom=0:0a:00,0
>     /boot/xen-4.3-unstable.gz placeholder pci-phantom=0:06:00,0 
> pci-phantom=1:0a:00,0

It seems to me from peering at the docs that one of those (probably the
second) ought to be correct, but I'm not sure what the <stride>
parameter is supposed to be, although I suspect it ought to be non-zero.

Jan, since you wrote this patch for Marvell devices I suppose you know
the right incantation for this bit of hardware?

> and finally, on the off chance I'd glean something useful doing this:
>    mybox:~$ strings /boot/xen-syms-4.3-unstable | grep -i phantom
>    <3>PCI phantom %04x:%02x:%02x.%u
>    pci-phantom
> I even tried this:
>     /boot/xen-4.3-unstable.gz placeholder pci-phantom=0000:06:00.0
> pci-phantom=0000:0a:00.0
> All to no avail.  I've Googled my smallish head off and I've tried to
> scour this list to see if anybody else has been trying out this
> option, but I can't seem to find anything.
> And so, hopefully, I ask:  Can anyone see what I'm doing wrong?  Has
> anyone gotten the pci-phantom option to work?  Am I just using the
> wrong syntax?
> Regards,
> Erlend
> _______________________________________________
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> Xen-users@xxxxxxxxxxxxx
> http://lists.xen.org/xen-users

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