I have a FreeBSD guest on a FreeBSD host, both amd64 head.
I decided to experiment with PCI pass-through and used an AHCI controller for
the experiment.  It seems like that partially works.  The guest detects the
controller and attaches a driver to it, the messages (reported capabilities,
etc) look identical to those on the host.  But the guest can not detect any
disks behind the controller.  From what I can tell, the guest has no problems
accessing PCI configuration registers and a memory mapped BAR.  Not sure about
the I/O ports.  What's suspicious is that there are no interrupts either for the
ppt device on the host or the ahci device in the guest.  Maybe that is what
causes the failure to see the disks.

When the guest driver attaches to the controller I see these messages on the 
host:
ppt0: attempting to allocate 1 MSI vectors (1 supported)
ppt0: using IRQ 265 for MSI
and in the guest:
ahci0: attempting to allocate 1 MSI vectors (1 supported)
ahci0: using IRQ 279 for MSI

But vmstat -i does not report any interrupts.

Just in case, the controller has some complex topology where the AHCI PCI device
is behind two PCI-PCI bridges from the main bus.  But I think that that should
not matter and the guest needs to see only the AHCI device and the host handles
the bridges.

Here are some more messages from the guest:
ahci0: <HighPoint RocketRAID 640 AHCI SATA controller> port
0x21c0-0x21c7,0x21c8-0x21cb,0x21d0-0x21d7,0x21d8-0x21db,0x21e0-0x21ef mem
0xc000e000-0xc000efff irq 17 at device 9.0 on pci0
ahci0: attempting to allocate 1 MSI vectors (1 supported)
ahci0: using IRQ 279 for MSI
ahci0: AHCI v1.00 with 2 6Gbps ports, Port Multiplier supported with FBS
ahci0: Caps: 64bit NCQ SNTF AL 6Gbps PM FBS PMD SSC PSC 32cmd eSATA 2ports
ahcich0: <AHCI channel> at channel 0 on ahci0
ahcich0: Caps: CPD ESP FBSCP
ahcich1: <AHCI channel> at channel 1 on ahci0
ahcich1: Caps: CPD ESP FBSCP
ahcich0: AHCI reset...
ahcich0: SATA connect time=100us status=00000123
ahcich0: AHCI reset: device found
ahcich1: AHCI reset...
ahcich1: SATA connect time=100us status=00000123
ahcich1: AHCI reset: device found
ahcich1: AHCI reset: device ready after 100ms
ahcich1: Poll timeout on slot 1 port 15
ahcich1: is 00000000 cs 00000002 ss 00000000 rs 00000002 tfd 150 serr 00000000
cmd 00318017
ahcich0: AHCI reset: device ready after 200ms
ahcich0: Poll timeout on slot 1 port 15
ahcich0: is 00000000 cs 00000002 ss 00000000 rs 00000002 tfd 150 serr 00000000
cmd 00318017
And some more...

Any ideas or suggestions?
Or maybe some additional information from me?

Thank you!

-- 
Andriy Gapon
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