Thanks Richard :)
On Sat, Aug 2, 2014 at 4:47 AM, Richard W.M. Jones <rjo...@redhat.com> wrote: > On Fri, Aug 01, 2014 at 11:15:29AM +0800, Gareth wrote: > > Hi all > > > > What does '-enable-kvm' option mean? I have heard two versions of > answers: > > It's a shortcut for: > > $qemu -machine accel=kvm > > > a) guest OS would have /dev/kvm device and which could help vm in guest > OS > > (nested vm) > > That's nested KVM, which is enabled as a module option in the kernel > module (on the host), eg: > > # modprobe kvm_intel nested=1 > > On AMD it's enabled by default. > > > b) use /dev/kvm and intel-vt on host OS which could help vm run more fast > > than pure emulator. > > Nearly. It uses /dev/kvm on the host, which may or may not be > implemented using Intel VT, or a variety of other techniques. > > You can also have fallbacks to software emulation (TCG): > > $qemu -machine accel=kvm:tcg > > Rich. > > -- > Richard Jones, Virtualization Group, Red Hat > http://people.redhat.com/~rjones > Read my programming and virtualization blog: http://rwmj.wordpress.com > virt-builder quickly builds VMs from scratch > http://libguestfs.org/virt-builder.1.html > > -- Gareth *Cloud Computing, OpenStack, Distributed Storage, Fitness, Basketball* *OpenStack contributor, kun_huang@freenode* *My promise: if you find any spelling or grammar mistakes in my email from Mar 1 2013, notify me * *and I'll donate $1 or ￥1 to an open organization you specify.*
