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

[Alex Williamson]

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