On Wed, Oct 06, 2010 at 12:01:45AM +0200, Petter Reinholdtsen wrote: > [Lennart Sorensen] > > I suspect if you run kvm with the -cpu option you can specify what > > you desire. I believe the default is to simply match whatever the > > host has, so if the host has a 64bit cpu, then the guest will too. > > Well, the host is using a 32-bit kernel too, so 64-bit kvm with > hardware virtualization is not really an option. > > meta:/# kvm -cpu ? > x86 qemu64 > x86 phenom > x86 core2duo > x86 qemu32 > x86 coreduo > x86 486 > x86 pentium > x86 pentium2 > x86 pentium3 > x86 athlon > x86 n270 > meta:/# > > This is the command line for the kvm instance in question: > > /usr/bin/kvm -S -M pc -m 512 -smp 1 -name pxetest > -uuid 9b733365-92e6-6b1f-7ad6-8a4f0caf6bfc > -monitor unix:/var/lib/libvirt/qemu/pxetest.monitor,server,nowait -boot c > -drive > file=/var/lib/libvirt/images/pxetest.img,if=ide,bus=0,unit=0,boot=on > -drive > file=/var/lib/libvirt/debian-edu-amd64-i386-DVD-squeeze-test.iso,if=ide,media=cdrom,bus=1,unit=0 > -net nic,macaddr=54:52:00:68:97:39,vlan=0,name=net0 > -net tap,fd=48,vlan=0,name=hostnet0 > -net nic,macaddr=52:54:00:04:a3:34,vlan=1,name=net1 > -net tap,fd=49,vlan=1,name=hostnet1 -serial pty -parallel none > -usb -usbdevice tablet -vnc 127.0.0.1:6 -k en-us -vga cirrus > -soundhw es1370 > > Anyone know how to detect 32-bits kvm virtual machines on a 32-bits > host on a CPU capable of running 64-bit kernels? Can we just look at > the vendor_id, model name, cpu family and model settings and disable > amd64 as an option if these are listed: > > vendor_id : GenuineIntel > cpu family : 6 > model : 2 > model name : QEMU Virtual CPU version 0.10.0
Well try starting the kvm with '-cpu qemu32'. That should provide the feature flags of a nice 32bit x86. Then see what cpu flags you get in the guest. As for the problem that the guest sees the lm flag on a 32bit host, that was at least a known bug last year (for example: https://bugzilla.redhat.com/show_bug.cgi?id=481274), but I have no idea if it has been solved yet. -- Len Sorensen -- To UNSUBSCRIBE, email to debian-boot-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20101005222347.ge12...@caffeine.csclub.uwaterloo.ca
