[vfio-users] 答复: Is there some method to merge 2 iommu group if I disable ACS

[Wuzongyong (Euler Dept)]

> On Mon, 7 Aug 2017 06:43:30 -0600
> Alex Williamson <alex.l.williamson at gmail.com> wrote:
> 
> > On Aug 7, 2017 5:39 AM, "Wuzongyong (Euler Dept)"
> > <cordius.wu at huawei.com>
> > wrote:
> >
> > Hi,
> >
> >
> >
> > Assume that an endpoint device(called ep1) belongs to iommu group 1,
> > and another endpoint device(called ep2) belongs to iommu group 2.
> >
> > Moreover, these two devices locate in different downstream ports of
> > the same switch respectively. If I disable the ACS of these downstream
> >
> > ports,  we know ep1 and ep2 should locate in the same iommu group. So
> > the question is if I can regenerate a iommu group to let ep1 and ep2
> >
> > locate in the same iommu group and let ep1 and ep2  can’t be assigned
> > to two different VMs without  host rebooting?
> 
> 
> Wow, complete formatting fail from gmail on my phone.  Sorry for that.
> Question is:
> 
> > Why would you want to be able to do this?
> 
> Thanks,
> 
> Alex

I want to do peer-to-peer communication between the two pci-e eps.