On 02.01.2010, at 14:45, Daniel Bareiro wrote: > Hi, Alexander. > > On Saturday, 02 January 2010 14:11:04 +0100, > Alexander Graf wrote: > >>>> In this guest I'm using Linux 2.6.32, with userspace kvm-85 of >>>> backports. For the VM booted within of 'test', I am using a qcow2 >>>> file. But when connecting via VNC, the boot process is hung in >>>> "Press for F12 boot menu". Sometimes it gets to pass this instance >>>> and I see the Debian install menu, but while I cross the options, >>>> it is hung. > >>> Also I was trying to use qemu-kvm-0.12.1.1 with to Linux 2.6.32 in >>> guest within 'test'. And here it happens something similar. >>> Sometimes I get to select the option of the menu of the installer, >>> but after boot, the installation is hung again. > >> Can your host do nested paging? Shadow shadow paging can be a bit >> flaky at times :-(. > > Hmmm... is there some way to verify that? > > The CPUs model is AMD Athlon 64 X2 Dual Core 3800+. Perhaps some flag > related? In such case, these are the available ones in the host: > > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge > mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext > fxsr_opt rdtscp lm 3dnowext 3dnow rep_good pni cx16 lahf_lm cmp_legacy > svm extapic cr8_legacy > > > When loading the module with "kvm_amd nested=1", /var/log/messages > registers the following thing: > > kvm: Nested Virtualization enabled With nested paging it would show something like this in dmesg: kvm: Nested Paging enabled All family 10 AMD CPUs have nested paging (read: quad-core and above). So I guess you found something going wrong with shadow-shadow paging. CC'ing Jörg. He's more into memory management than me :-). Alex-- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
