[Qemu-devel] Re: qemu-dm writing garbage into PCI BAR registers in HVM guest in XEN 3.3.1 on SLES11

[Dan Gora]

Does anyone care about this bug?  I'm going to lose access to the test
machine where this is easily reproducible pretty soon, so if anyone
wants to take a look at this issue, now would be a good time.

thanks,
dan


On Thu, Mar 18, 2010 at 3:31 PM, Dan Gora <address@hidden> wrote:
> Based on a recommendation from the xen-devel list I changed my domU to
> use the e1000 driver rather than the rtl8139 and the problem went
> away... So there is definately a bug in the rtl8139 driver somewhere..
>
> thanks,
> dan
>
>
> On Thu, Mar 18, 2010 at 1:42 AM, Dan Gora <address@hidden> wrote:
>> Hi All,
>>
>> I've found a problem in qemu-dm from xen 3.3.1_18546_12-3.1 from
>> SLES11.  I've posted this question to xen-devel as well, but I thought
>> that I'd post it here since the problem appears to be in qemu-dm.
>>
>> I began investigating this problem when we found that if we pass two
>> instances of our board through to a single HVM domU instance that if
>> we load then unload our driver, after many tens of seconds (30-60 or
>> so) something would write garbage to one of the board's PCI BAR
>> registers.  After a couple of days of debugging I've isolated the
>> problem down to the rtl8341 in QEMU, but I'm really not sure what is
>> causing it.  It appears that rtl8341 is writing an ethernet packet
>> with write() down a file descriptor which is actually attached to
>> sysfs and my board's PCI configuration space registers.
>>
>



-- 
Dan Gora
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