> From: Alex Williamson <alex.williamson@xxxxxxxxxx> > Sent: Friday, June 4, 2021 4:42 AM > > > 'qemu --allow-no-snoop' makes more sense to me > > I'd be tempted to attach it to the -device vfio-pci option, it's > specific drivers for specific devices that are going to want this and > those devices may not be permanently attached to the VM. But I see in > the other thread you're trying to optimize IOMMU page table sharing. > > There's a usability question in either case though and I'm not sure how > to get around it other than QEMU or the kernel knowing a list of > devices (explicit IDs or vendor+class) to select per device defaults. > "-device vfio-pci" is a per-device option, which implies that the no-snoop choice is given to the admin then no need to maintain a fixed device list in Qemu? Thanks Kevin
