On 4 December 2020 18:26:36 GMT, Alexander Graf <graf@xxxxxxxxxx> wrote: >How much of this can we handle with the MSR allow listing and MSR >trapping in user space? We resisted that trapping for a long time but have it now, and both the existing Xen and Hyper-V support — as well as a bunch of other things that KVM has historically done in-kernel on trapping MSRs — could *theoretically* be done in userspace. But they all already exist in the kernel. This is just a bug fix because the Hyper-V support broke it for Xen due to the conflict. -- Sent from my Android device with K-9 Mail. Please excuse my brevity.