On 5/3/24 16:10, Jason Gunthorpe wrote:
On Fri, May 03, 2024 at 04:04:25PM +0200, Cédric Le Goater wrote:
However, have you considered another/complementary approach which
would be to create an host IOMMU (iommufd) backend object and a vIOMMU
device object together for each vfio-pci device being plugged in the
machine ?
Something like,
-device pcie-root-port,port=23,chassis=8,id=pci.8,bus=pcie.0 \
-object iommufd,id=iommufd1 \
-device
intel-iommu,intremap=on,device-iotlb=on,caching-mode=on,iommufd=iommufd1 \
-device vfio-pci,host=0000:08:10.0,bus=pci.1,iommufd=iommufd0
? The main point of this is to have a single iommufd FD open in
qemu. Not multiple.
oups. The above example should have the same IOMMUFD object device
instance: iommufd0.
This is bogus copy-paste of a command line with multiple vfio-pci
devices, each using its own IOMMUFD object device instance. That's
where the idea comes from. Sorry for the noise.
C.
