Hi,
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
guest.
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
hdr=0x00
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:
https://people.freebsd.org/~neel/patches/bhyve_ignore_unsupported_pba.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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