Re: [Xen-devel] Bug when disabling/enabling a PT device with MSI enabled

[Tom Rotenberg <tom.rotenberg@xxxxxxxxx>]

Can u please supply more details? how can i fix this issue?
I think that when the hardware reset occured, the MSI was disabled,
and that needs to be re-enabled again... no?

On Tue, Nov 24, 2009 at 9:48 PM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
> On Tue, Nov 24, 2009 at 08:42:49PM +0200, Tom Rotenberg wrote:
>> Hi,
>>
>> I am using the xen-3,4, and i am doing pass-through for a device with
>> MSI enabled (the device of-course supports MSI) to a domU with Windows
>> XP. When i disable and then re-enable the device using Windows device
>> manager, everything looks like it's working fine, but the device seems
>> to malfunction.
>> After digging a little bit, i saw that the problem is, because the bit
>> of the interrupt-status (bit 3) in the status register (offset 0x6 in
>> the PCI config space) was turned on somehow -  this proibably caused
>> the MSI to malfunction (because the IntX assertion was enabled - thus
>> disabling the MSI) - and this lead to the problem i experienced.
>>
>> Any ideas on how to solve this issue?
>
> Looks like QEMU is not doing its job. It ought to be tracking
> when an MSI devices transforms to a INTx PCI device (and vice-versa) and
> make the appropiate Xen calls. Look in ioemu-dir/hw/pass-through.c
>

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