Diego Viola <diego.viola@xxxxxxxxx> writes: > Hi Vitaly, > > On Fri, Jan 25, 2019 at 12:32 PM Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> wrote: >> >> Diego Viola <diego.viola@xxxxxxxxx> writes: >> >> > Hello, >> > >> > I am trying to do nested KVM on a Ryzen 5 2400G, my use case is the following: >> > >> > - Arch Linux as the host OS. >> > - Ubuntu 18.04.1 as the guest OS. >> > >> > I am using qemu 3.1.0-1 (from the extra repository) on Arch Linux. >> > >> > This is the command I am using to start the VM: >> > >> > qemu-system-x86_64 -enable-kvm -hda ubuntu.qcow2 -m 4G -smp 4 -vga >> > virtio -cpu host >> >> Could you please try if the following patch helps? >> >> https://www.spinics.net/lists/kvm/msg179946.html >> >> (actually, this looks more like >> https://www.spinics.net/lists/kvm/msg179297.html but your 4.20.3 should >> have it already) > > Yes, I checked and 4.20.3 already has the second patch. > > Do you have another patch you want me to test? > You can still try the first one I mentioned (or, better, just try upstream 5.0-rc4). Other than that I can suggest trying to disabling different CPU features on the host (e.g. '-cpu host,-npt,-nrip_save') to see if the issue goes away. -- Vitaly
