"Michael S. Tsirkin" <mst@xxxxxxxxxx> writes: > About the feature bit, I am not sure why it's really needed. A single > mmio access is cheaper than two io accesses anyway, right? So it makes > sense for a kvm guest whether host has this feature or not. > We need to be careful and limit to a specific QEMU implementation > to avoid tripping up bugs, but it seems more appropriate to > check it using pci host IDs. Right, it's just that "running on KVM" is too coarse grained, we just need a way to somehow distinguish between "known/good" and "unknown/buggy" configurations. -- Vitaly
