Re: [pve-devel] [PATCH docs v4 4/5] added vIOMMU documentation

[Wolfgang Bumiller <w.bumiller@proxmox.com>]

On Tue, Jan 17, 2023 at 11:55:47AM +0100, Markus Frank wrote:
> 
> 
> On 1/16/23 11:00, Wolfgang Bumiller wrote:
> > On Fri, Jan 13, 2023 at 02:31:36PM +0100, Markus Frank wrote:
> > > Moreover it adds an extra AMDVI-PCI device that is using the first pci address.
> > > `kvm: -device VGA,id=vga,bus=pcie.0,addr=0x1: PCI: slot 1 function 0 not available for VGA, in use by AMDVI-PCI,id=(null)`
> > 
> > For that I'd say, try to add the AMDVI-PCI device manually to an
> > explicitly chosen slot. We need to avoid automatically added devices
> > like the plague, because moving them later can break live snapshots (and
> > windows).
> > 
> I manually added a AMDVI-PCI device with a explicitly chosen slot but
> amd-iommu still adds an extra AMDVI-PCI device.
> I do not see any way to prevent this or to change the address
> of the additionally added AMDVI-PCI device (from amd-iommu).
> 
> I think amd-iommu is very impractical if we cannot set this slot manually.

Okay, let's just not provide it for now.