On 11/30/14 02:37, Neel Natu wrote:
The "Unsupported MSI-X configuration" referred to here is that bhyve
doesn't emulate the 'Pending Bit Array'.

In most cases this is not relevant because the PBA and the MSI-X
tables are in different page frames. In this case the MSI-X tables are
emulated and the pending bit array page is passed through to the

If the PBA and MSI-X tables are on the same page frame then you see
this error. You can confirm this by doing 'pciconf -lvbc pci0:2:0:0'.

Here is the ouput:
bge0@pci0:2:0:0:        class=0x020000 card=0x06471025 chip=0x16b514e4 rev=0x10 
    vendor     = 'Broadcom Corporation'
    device     = 'NetLink BCM57785 Gigabit Ethernet PCIe'
    class      = network
    subclass   = ethernet
    bar   [10] = type Prefetchable Memory, range 64, base 0xb3430000, size 
65536, enabled
    bar   [18] = type Prefetchable Memory, range 64, base 0xb3440000, size 
65536, enabled
    cap 01[48] = powerspec 3  supports D0 D3  current D0
    cap 05[58] = MSI supports 8 messages, 64 bit enabled with 1 message
    cap 11[a0] = MSI-X supports 5 messages
                 Table in map 0x18[0x0], PBA in map 0x18[0x120]
    cap 10[ac] = PCI-Express 2 endpoint max data 128(128) link x1(x1)
                 speed 2.5(2.5) ASPM L1(L0s/L1)
    ecap 0001[100] = AER 1 0 fatal 0 non-fatal 1 corrected
    ecap 0003[13c] = Serial 1 0000208984c6b5ed
    ecap 0004[150] = Power Budgeting 1
    ecap 0002[160] = VC 1 max VC0

Having said that the drivers I have seen don't rely at all on the PBA.
So it may be possible that this works just fine with this patch:

If it does then I can add a tunable to bhyve to ignore this check.

It seems a tunable can help.

I tried the patch and now bhyve continues and indeed I see the bge device in my VM. What is interesting/strange is that the device is partly functioning. For example, it does detect a link change when I remove the cable but that's all. The kernel also complains with a "bge watchdog timeout" message.

In case there is no hardware support for VT-d, as Craig noticed, how could this behaviour be explained? Why does link detection work?

Again, thank you both!
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