Re: [Xen-devel] passthroughed msix device

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 27.02.13 at 06:49, Zhenzhong Duan <zhenzhong.duan@xxxxxxxxxx> wrote:

> On 2013-02-26 18:08, Jan Beulich wrote:
>>>>> On 26.02.13 at 09:56, DuanZhenzhong <zhenzhong.duan@xxxxxxxxxx> wrote:
>>> pci_msix_writel: Can't update entry 0 since MSI-X is already enabled
>>> (fee00000 -> fee02000)
>>> pci_msix_writel: Can't update entry 0 since MSI-X is already enabled
>>> (00004059 -> 00004071)
>> If you look at the code issuing this message, the situation is
>> pretty clear (and I think it as described already in the past,
>> albeit I have no link at hand): qemu lacks proper emulation of
>> the mask bit. pci_msix_write() looks at the physical one, yet
>> when the guest sets the virtual mask bit, nothing is being
>> done at all to make the hypervisor also mask the physical
>> entry:
>>
>>      if (offset == PCI_MSIX_ENTRY_VECTOR_CTRL) {
>>          if (msix->enabled && !(val & PCI_MSIX_ENTRY_CTRL_MASKBIT)) {
>>              xen_pt_msix_update_one(s, entry_nr);
>>          }
>>      }
>>
>> There's probably quite a bit of code to be written to make this
>> work.
> Is there plan of fixing it?

I'm not aware of anyone working on this, or having planned to.
Want to take a shot?

Jan


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