Cool, so we need to get that pulled into stable. Sorry for being unclear before. Yes, my kernel just had the patch from bisection reverted. The kernel Seth made had the fix for that on top.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1278531 Title: nested kvm fails with trusty and upstream kernels Status in “linux” package in Ubuntu: Confirmed Bug description: First: the 3.2 precise kernel handled nested qemu very well. As of saucy it has declined. In a host with saucy kernel (even on precise userspace), attempts to do nested kvm result in a hung kvm (inside the guest - host proceeds ok) taking 100%cpu. In a host with trusty kernel (even on precise userspace), nested kvm fails get past grub. I have two screenshots, one resulting from attempting to boot from a precise mini-iso, another from attempting to boot a cloud image at: http://cloud-images.ubuntu.com/quantal/current /quantal-server-cloudimg-amd64-disk1.img. (If you convert that image to raw, it fails the same way). On the host, I see the following in /var/log/kern.log: kvm: zapping shadow pages for mmio generation wraparound I've reproduced this both on (a) a intel based vostro laptop - with separate installs of precise and saucy (with ubuntu precise, saucy, trust, upstream kernels), (b) an intel based server with precise userspace and saucy and trusty kernels; and (c) an intel laptop running full uptodate trusty. As nested qemu worked will in the previous LTS, I think it is important to have it working in 14.04 LTS. ============= Original description ================ I have a precise host with saucy ubuntu kernel installed. I installed two VMs there, a saucy and a trusty guest. In the saucy guest, non-accelerated qemu works fine, but accelerated kvm hangs the first-level saucy guest completely, and pins it at 200% cpu usage: qemu-system-x86 --enable-kvm -monitor stdio -vnc :1 On the trusty guest it works just fine. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1278531/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
