Re: Why doesn't Intel e1000 NIC work correctly in Windows XP?

[Jan Kiszka <jan.kiszka@siemens.com>]

On 2011-06-15 02:54, Alex Williamson wrote:
> On Tue, 2011-06-14 at 16:11 +0800, Flypen CloudMe wrote:
>> Hi,
>>
>> I use Redhat Enterprise Linux 6, and use the KVM that is released by
>> Redhat officially. The kernel version is 2.6.32-71.el6.x86_64.
>>
>> It seems that the IRQs are conflicted after reboot. The NIC and the
>> SCSI controller have the same IRQ number. If I re-install the NIC
>> driver, the IRQ number of the NIC will be assigned another value, then
>> it can work normally. Do we have a way to let the NIC and the SCSI
>> controller have different IRQ number in VM?
> 
> I'll see if I can reproduce and figure anything out.  Windows XP isn't a
> guest we concentrate on, especially with device assignment.  Are you
> using an AMD or Intel host system?  Does the same thing happen if you
> run the XP guest on an IDE controller?  It would be helpful to post the
> guest configuration, command line used or libvirt xml.  Also, you might
> try latest upstream qemu-kvm to see if the problem still exists.

Maybe tracking of the INTx route across reset fails. Does this help?

diff --git a/hw/device-assignment.c b/hw/device-assignment.c
index 7eeecad..0693141 100644
--- a/hw/device-assignment.c
+++ b/hw/device-assignment.c
@@ -1719,6 +1719,8 @@ static void reset_assigned_device(DeviceState *dev)
      * disconnected from the PCI bus. This avoids further DMA transfers.
      */
     assigned_dev_pci_write_config(pci_dev, PCI_COMMAND, 0, 2);
+
+    assign_irq(adev);
 }
 
 static int assigned_initfn(struct PCIDevice *pci_dev)


Jan

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