On Wed, 2013-07-24 at 10:04 +0200, Massimiliano Adamo wrote: > > On Tue, 2013-07-23 at 15:31 -0600, Alex Williamson wrote: > > On Tue, 2013-07-23 at 23:11 +0200, Massimiliano Adamo wrote: > > > All, > > > > > > this is a bug with KVM, impacting (at least) all mainstream kernels that > > > I tried so far: 3.2, 3.3, 3.4, 3.5, 3.8, 3.10 and 3.11 > > > > > > This is the link of the downstream bug: > > > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1201092 > > > > > > - Firt of all I mention that this bug has been raised also for Fedora > > > 18. > > > Here is the link: https://bugzilla.redhat.com/show_bug.cgi?id=978608 > > > > > > - I am running Ubuntu Raring (with the kernel 3.8.0-27-generic), but > > > I've also tried the mainstream kernel (without Ubuntu patches). > > > > > > - It happens with the following CPU: AMD E-350D > > > > > > - The kvm-ok executable says that the system is capable of running KVM, > > > but it also says the it's disabled in the BIOS. > > > > > > - This is the out put of kvm-ok: > > > # kvm-ok > > > INFO: /dev/kvm does not exist > > > HINT: sudo modprobe kvm_amd > > > INFO: Your CPU supports KVM extensions > > > INFO: KVM (svm) is disabled by your BIOS > > > HINT: Enter your BIOS setup and enable Virtualization Technology (VT), > > > and then hard poweroff/poweron your system > > > KVM acceleration can NOT be used > > > > > > - This is what modprobe kvm-amd says: > > > # modprobe kvm-amd > > > ERROR: could not insert 'kvm_amd': Operation not supported > > > root@yasna:~# dmesg |tail -n1 > > > [ 2542.263745] kvm: disabled by bios > > > > > > - AMD-V extension on Virtualbox works correctly. > > > Therefore the extension works properly but it's not recognized by KVM. > > > > What evidence do you have that Virtualbox is actually making use of > > AMD-V? > > > > Hi! That's a good point. > Right now I can only say "it was selectable from the GUI". Therefore I > just imagined "it's recognized". > Now I try to see how to enable/check logs on Virtualbox and I'll get > back to you with some feedback. > Hi, logs are enabled by default and they say that the extension might be disabled even for Virtualbox: 00:00:01.406771 SVM - AMD VM Extensions = 0 (1) 00:00:01.406945 HWACCM: No VT-x or AMD-V CPU extension found. Reason VERR_SVM_DISABLED (therefore, it let's you enable the AMD-V feature, because it's found on the CPU but it's not able to use it). And I've found a suggestion to run the commands below: # rdmsr -f 12:12 0xc0000080 # If set (1), SVME is enabled. 0 # # rdmsr -f 4:4 0xc0010114 # If set (1), it is disabled. 1 If I will have time, I would try installing Windows on a spare partition, and then try running virtualbox there (and check logs). If you have a better advice, or any other idea, please just let me know. p.s.: CC-ing the person who is facing the same issue with Fedora. -- Massimiliano -- 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
