Talk:KVM

From ArchWiki
Jump to: navigation, search

Enabling huge pages

With systemd, hugetlbfs is mounted on /dev/hugepages by default, but with mode 0755 and root's uid and gid.

I'm giving this a try right now. Rbellamy (talk) 03:39, 27 January 2015 (UTC)

And not so much... seems I can't access the hugetlbfs as I should.

Jan 26 19:57:59 eanna libvirtd[619]: Unable to read from monitor: Connection reset by peer
Jan 26 19:57:59 eanna libvirtd[619]: internal error: early end of file from monitor: possible problem:
                                     2015-01-27T03:57:59.072699Z qemu-system-x86_64: cannot set up guest memory 'pc.ram': Cannot allocate memory
Jan 26 19:57:59 eanna kernel: virbr0: port 2(vnet0) entered disabled state
Jan 26 19:57:59 eanna kernel: device vnet0 left promiscuous mode
Jan 26 19:57:59 eanna kernel: virbr0: port 2(vnet0) entered disabled state
Jan 26 19:57:59 eanna avahi-daemon[669]: Withdrawing workstation service for vnet0.
Jan 26 19:57:59 eanna NetworkManager[576]: <info> (virbr0): link disconnected
Jan 26 19:57:59 eanna systemd-coredump[894]: Process 870 (qemu-system-x86) of user 99 dumped core.
Jan 26 19:57:59 eanna systemd-machined[871]: Machine qemu-prometheus terminated.
Jan 26 19:57:59 eanna gnome-session[711]: Gjs-Message: JS LOG: Failed to launch ibus-daemon: Failed to execute child process "ibus-daemon" (No such file or  directory)
Jan 26 19:57:59 eanna dbus[571]: [system] Activating via systemd: service name='org.freedesktop.GeoClue2' unit='geoclue.service'
Jan 26 19:57:59 eanna libvirtd[619]: error from service: TerminateMachine: No machine 'qemu-prometheus' known
Jan 26 19:57:59 eanna libvirtd[619]: Failed to autostart VM 'prometheus': internal error: early end of file from monitor: possible problem:
                                     2015-01-27T03:57:59.072699Z qemu-system-x86_64: cannot set up guest memory 'pc.ram': Cannot allocate memory
Jan 26 19:57:59 eanna dbus[571]: [system] Activating via systemd: service name='fi.w1.wpa_supplicant1' unit='wpa_supplicant.service'
Jan 26 19:57:59 eanna libvirtd[619]: internal error: Unable to find any usable hugetlbfs mount for 16777216 KiB
Jan 26 19:57:59 eanna dbus[571]: [system] Successfully activated service 'fi.w1.wpa_supplicant1'
Jan 26 19:57:59 eanna NetworkManager[576]: <info> wpa_supplicant started
Jan 26 19:57:59 eanna polkitd[598]: Registered Authentication Agent for unix-session:c1 (system bus name :1.29 [gnome-shell --mode=gdm], object path /org/ freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.
Jan 26 19:57:59 eanna dbus[571]: [system] Successfully activated service 'org.freedesktop.GeoClue2'
Jan 26 19:57:59 eanna gnome-session[711]: Gjs-Message: JS LOG: No permission to trigger offline updates: Polkit.Error: GDBus.Error:org.freedesktop. PolicyKit1.Error.Failed: Action org.freedesktop.packagekit.trigg
Jan 26 19:57:59 eanna org.freedesktop.Telepathy.AccountManager[715]: (process:921): libnm-glib-WARNING **: Error in get_property: Method "Get" with  signature "ss" on interface "org.freedesktop.DBus.Properties" d
Jan 26 19:57:59 eanna libvirtd[619]: Failed to autostart VM 'atlas': internal error: Unable to find any usable hugetlbfs mount for 16777216 KiB

Rbellamy (talk) 04:11, 27 January 2015 (UTC)

Merge KVM article into QEMU

Because the QEMU-KVM fork of QEMU has been deprecated/obsoleted as of QEMU 1.3 [1] (about 9 months ago as of this writing [2]) and QEMU is now on version 1.6, we should strongly consider merging the KVM article into the main article for QEMU. A separate article for the KVM fork made sense historically, but now that the fork has been merged upstream, we should just keep everything on one page.

Does anyone disagree?
-- Jstjohn (talk) 16:29, 16 September 2013 (UTC)

Good idea, I don't think anybody can disagree, as the main section of this article, KVM#How_to_use_KVM, already just links to QEMU ^^
If then somebody considers QEMU to have become too long, it should be discussed to split it in some other way.
-- Kynikos (talk) 01:06, 18 September 2013 (UTC)
The problems of KVM#Tips_and_tricks should be solved along the way, especially KVM#Live_snapshots which belongs to libvirt and not to QEMU. It should also be clearly stated which features are KVM-specific to avoid confusion.
-- Lahwaacz (talk) 10:44, 22 September 2013 (UTC)
I just merged KVM#Live_snapshots into libvirt.
-- Jstjohn (talk) 01:03, 7 November 2013 (UTC)

Works with "AMD FX(tm)-8350 Eight-Core Processor" using 2013.11.01 64-bit

Using Arch Linux release 2013.11.01 in 64-bit mode... it boots fine. Following the wikis... this is basically the parameters I used

$ /usr/bin/qemu-system-x86_64 -boot d -m 1024 -hda '/home/user/path/to/storage' -cdrom '/path/to/archlinux-2013.11.01-dual.iso' -net nic,vlanx=0 -net user,vlan=0 -localtime -k en-gb -smp 8 -enable-kvm -cpu host &
  • I also booted the Gentoo minimal ISO 20131010 in 64-bit mode (go to gentoo to find out more) using the same parameter but different ISO
$ /usr/bin/qemu-system-x86_64 -boot d -m 1024 -hda '/home/user/path/to/storage' -cdrom '/path/to/install-amd64-minimal-20131010.iso' -net nic,vlan=0 -net user,vlan=0 -localtime -k en-gb -smp 8 -enable-kvm -cpu host &
  • During live CD boot up... I see this error message... which I think is normal...
Failed to access perfctr msr (MSR c0010001 is ffffffffffffffff)
  • You also get errors about not being able to access hardware... obvious why :p (unless I'm wrong)
  • I haven't installed Arch Linux in the guest yet (busy :p) but will get some time to
  • from what I can see, the parameter "nested" is already set to "1" for the kvm_amd module when using the systool command before applying the "nested" parameter myself
  • I found loading kvm or kvm_amd loads both
  • you should say grep svm /proc/cpuinfo for AMD
  • I have another AMD machine which has "AMD Phenom II x4 955" (showing the svm CPU flag from /proc/cpuinfo file which too is using Arch Linux (my server) when I have time... will try it out there
  • I do plan to move to Intel... better drivers... lets get cracking before I move to Intel
  • I'm new to wiki code :p

-- Sinatosk (talk) 22:34, 4 November 2013