Re: [Xen-devel] passthroughed msix device

[Zhenzhong Duan <zhenzhong.duan@xxxxxxxxxx>]

On 2013-02-27 16:36, Jan Beulich wrote:
> > > > 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?
I'm looking at it.
zduan

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