Re: [Xen-devel] Problems accessing passthrough PCI device

[Simon Martin <furryfuttock@xxxxxxxxx>]

Hello Jan,

Friday, November 14, 2014, 5:27:36 AM, you wrote:

>>> I implied your earlier statement to mean that. But - did you also
>>> verify that the three flags actually end up set (ideally from both
>>> DomU and Dom0 perspective)? The PCI backend may be screwing
>>> up things...
>> 
>> Yes I do verify the write. How do I check this from Dom0?

> Just use lspci.

I've just checked this with lspci. I see that the IO is being enabled.
Any   other   idea   on   why I might be reading back 0xff for all PCI
memory area reads? The lspci output follows.

Before starting DomU

smartin@smartin-xen:~$ lspci -s 00:19.0 -x
00:19.0 Ethernet controller: Intel Corporation Device 1559 (rev 04)
00: 86 80 59 15 00 00 10 00 04 00 00 02 00 00 00 00

After DomU initialisation

smartin@smartin-xen:~$ lspci -s 00:19.0 -x
00:19.0 Ethernet controller: Intel Corporation Device 1559 (rev 04)
00: 86 80 59 15 02 00 10 00 04 00 00 02 00 00 00 00

After stopping DomU

smartin@smartin-xen:~$ lspci -s 00:19.0 -x
00:19.0 Ethernet controller: Intel Corporation Device 1559 (rev 04)
00: 86 80 59 15 00 00 10 00 04 00 00 02 00 00 00 00


-- 
Best regards,
 Simon                            mailto:furryfuttock@xxxxxxxxx


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