libvirt users - May 2016 - Nested Virtualization not working

Hi,

I wonder if someone can provide pointers on what might be wrong with
my setup. I'm running a kvm host Fedora23 with rawhide kernel on top
of a skylake cpu - Intel(R) Core(TM) i5-6260U CPU @ 1.80GHz (family:
0x6, model: 0x4e, stepping: 0x3)

As part of an experiment, I have enabled Nested virt support on the
host and created a fedora23 guest with virt-manager using
host-passthrough as the cpu model. The guest comes up fine and was
updated without issues.

Now if I install VirtualBox 5.0 and try to start a vm (fedora 23
again) I end up with a protection fault in the console (below) and the
vm does not boot. A similar fault appeared when trying with a
centos7.2 guest and a ubuntu vm but in that case just after the fault
the guest reboots itself.

What could be the problem here? Any help is very appreciated.

Thanks,

Daniel

[   77.538312] general protection fault: 0000 [#1] SMP
[   77.539235] Modules linked in: ip6t_rpfilter ip6t_REJECT
nf_reject_ipv6 xt_conntrack ip_set nfnetlink vboxpci(OE)
vboxnetadp(OE) vboxnetflt(OE) ebtable_broute bridge stp llc
ebtable_filter ebtable_nat ebtables ip6table_mangle ip6table_security
ip6table_raw ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6
ip6table_filter ip6_tables iptable_mangle iptable_security iptable_raw
iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat
nf_conntrack snd_hda_codec_generic vboxdrv(OE) iosf_mbi kvm_intel
snd_hda_intel kvm snd_hda_codec snd_hda_core snd_hwdep snd_seq
snd_seq_device joydev snd_pcm ppdev irqbypass crct10dif_pclmul
crc32_pclmul snd_timer snd acpi_cpufreq virtio_balloon parport_pc
tpm_tis soundcore tpm i2c_piix4 parport nfsd auth_rpcgss nfs_acl lockd
grace sunrpc xfs libcrc32c virtio_console virtio_net virtio_blk qxl
drm_kms_helper ttm drm crc32c_intel serio_raw virtio_pci virtio_ring
virtio ata_generic pata_acpi
[   77.548011] CPU: 0 PID: 1991 Comm: EMT Tainted: G           OE
4.4.9-300.fc23.x86_64 #1
[   77.548719] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.8.2-20150714_191134- 04/01/2014
[   77.549715] task: ffff8800b4e8dd00 ti: ffff8800b4fdc000 task.ti:
ffff8800b4fdc000
[   77.550320] RIP: 0010:[<ffffffffa05ee506>]  [<ffffffffa05ee506>]
0xffffffffa05ee506
[   77.551053] RSP: 0018:ffff8800b4fdfd70  EFLAGS: 00050206
[   77.551548] RAX: 00000000003406f0 RBX: 00000000ffffffdb RCX: 000000000000009b
[   77.552193] RDX: 0000000000000000 RSI: ffff8800b4fdfd00 RDI: ffff8800b4fdfcc8
[   77.552952] RBP: ffff8800b4fdfd90 R08: 0000000000000004 R09: 00000000003406f0
[   77.553498] R10: 0000000049656e69 R11: 000000000f8bfbff R12: 0000000000000020
[   77.554042] R13: 0000000000000000 R14: ffffc90001c0207c R15: ffffffffa04c5220
[   77.554594] FS:  00007fc70f128700(0000) GS:ffff88013fc00000(0000)
knlGS:0000000000000000
[   77.555208] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   77.555650] CR2: 00007fc70eecb000 CR3: 00000000ba695000 CR4: 00000000003406f0
[   77.556195] Stack:
[   77.556360]  0000000000000000 ffffffff00000000 0000000000000000
0000000000000002
[   77.556985]  ffff8800b4fdfdb0 ffffffffa0603db1 ffffc90001c02010
ffff88013822f6d0
[   77.557597]  ffff8800b4fdfe30 ffffffffa048b2f6 ffff8800b4ebc5c0
ffff8800b4fdc000
[   77.558210] Call Trace:
[   77.558421]  [<ffffffffa048b2f6>] ? supdrvIOCtl+0x2d36/0x3250 [vboxdrv]
[   77.558964]  [<ffffffff813c2e45>] ?
copy_user_enhanced_fast_string+0x5/0x10
[   77.559526]  [<ffffffffa04845b0>] ?
VBoxDrvLinuxIOCtl_5_0_20+0x150/0x250 [vboxdrv]
[   77.560133]  [<ffffffff81241648>] ? do_vfs_ioctl+0x298/0x480
[   77.560593]  [<ffffffff81338393>] ? security_file_ioctl+0x43/0x60
[   77.561081]  [<ffffffff812418a9>] ? SyS_ioctl+0x79/0x90
[   77.561503]  [<ffffffff817a0f2e>] ? entry_SYSCALL_64_fastpath+0x12/0x71
[   77.562033] Code: 88 e4 fc ff ff b9 3a 00 00 00 0f 32 48 c1 e2 20
89 c0 48 09 d0 48 89 05 f9 db 0e 00 0f 20 e0 b9 9b 00 00 00 48 89 05
d2 db 0e 00 <0f> 32 48 c1 e2 20 89 c0 b9 80 00 00 c0 48 09 d0 48 89 05
cb db
[   77.564260] RIP  [<ffffffffa05ee506>] 0xffffffffa05ee506
[   77.564701]  RSP <ffff8800b4fdfd70>
[   77.565103] ---[ end trace 9cf480524482767b ]---

I wonder if it has to do with this https://www.virtualbox.org/ticket/14965

Anybody here have experienced a similar issue?

On 15 May 2016 at 20:05, Daniel Sanabria <sanabria.d@gmail.com> wrote:
> Hi,
>
> I wonder if someone can provide pointers on what might be wrong with
> my setup. I'm running a kvm host Fedora23 with rawhide kernel on top
> of a skylake cpu - Intel(R) Core(TM) i5-6260U CPU @ 1.80GHz (family:
> 0x6, model: 0x4e, stepping: 0x3)
>
> As part of an experiment, I have enabled Nested virt support on the
> host and created a fedora23 guest with virt-manager using
> host-passthrough as the cpu model. The guest comes up fine and was
> updated without issues.
>
> Now if I install VirtualBox 5.0 and try to start a vm (fedora 23
> again) I end up with a protection fault in the console (below) and the
> vm does not boot. A similar fault appeared when trying with a
> centos7.2 guest and a ubuntu vm but in that case just after the fault
> the guest reboots itself.
>
> What could be the problem here? Any help is very appreciated.
>
> Thanks,
>
> Daniel
>
> [   77.538312] general protection fault: 0000 [#1] SMP
> [   77.539235] Modules linked in: ip6t_rpfilter ip6t_REJECT
> nf_reject_ipv6 xt_conntrack ip_set nfnetlink vboxpci(OE)
> vboxnetadp(OE) vboxnetflt(OE) ebtable_broute bridge stp llc
> ebtable_filter ebtable_nat ebtables ip6table_mangle ip6table_security
> ip6table_raw ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6
> ip6table_filter ip6_tables iptable_mangle iptable_security iptable_raw
> iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat
> nf_conntrack snd_hda_codec_generic vboxdrv(OE) iosf_mbi kvm_intel
> snd_hda_intel kvm snd_hda_codec snd_hda_core snd_hwdep snd_seq
> snd_seq_device joydev snd_pcm ppdev irqbypass crct10dif_pclmul
> crc32_pclmul snd_timer snd acpi_cpufreq virtio_balloon parport_pc
> tpm_tis soundcore tpm i2c_piix4 parport nfsd auth_rpcgss nfs_acl lockd
> grace sunrpc xfs libcrc32c virtio_console virtio_net virtio_blk qxl
> drm_kms_helper ttm drm crc32c_intel serio_raw virtio_pci virtio_ring
> virtio ata_generic pata_acpi
> [   77.548011] CPU: 0 PID: 1991 Comm: EMT Tainted: G           OE
> 4.4.9-300.fc23.x86_64 #1
> [   77.548719] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> BIOS 1.8.2-20150714_191134- 04/01/2014
> [   77.549715] task: ffff8800b4e8dd00 ti: ffff8800b4fdc000 task.ti:
> ffff8800b4fdc000
> [   77.550320] RIP: 0010:[<ffffffffa05ee506>] 
[<ffffffffa05ee506>]
> 0xffffffffa05ee506
> [   77.551053] RSP: 0018:ffff8800b4fdfd70  EFLAGS: 00050206
> [   77.551548] RAX: 00000000003406f0 RBX: 00000000ffffffdb RCX:
> 000000000000009b
> [   77.552193] RDX: 0000000000000000 RSI: ffff8800b4fdfd00 RDI:
> ffff8800b4fdfcc8
> [   77.552952] RBP: ffff8800b4fdfd90 R08: 0000000000000004 R09:
> 00000000003406f0
> [   77.553498] R10: 0000000049656e69 R11: 000000000f8bfbff R12:
> 0000000000000020
> [   77.554042] R13: 0000000000000000 R14: ffffc90001c0207c R15:
> ffffffffa04c5220
> [   77.554594] FS:  00007fc70f128700(0000) GS:ffff88013fc00000(0000)
> knlGS:0000000000000000
> [   77.555208] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [   77.555650] CR2: 00007fc70eecb000 CR3: 00000000ba695000 CR4:
> 00000000003406f0
> [   77.556195] Stack:
> [   77.556360]  0000000000000000 ffffffff00000000 0000000000000000
> 0000000000000002
> [   77.556985]  ffff8800b4fdfdb0 ffffffffa0603db1 ffffc90001c02010
> ffff88013822f6d0
> [   77.557597]  ffff8800b4fdfe30 ffffffffa048b2f6 ffff8800b4ebc5c0
> ffff8800b4fdc000
> [   77.558210] Call Trace:
> [   77.558421]  [<ffffffffa048b2f6>] ? supdrvIOCtl+0x2d36/0x3250
[vboxdrv]
> [   77.558964]  [<ffffffff813c2e45>] ?
> copy_user_enhanced_fast_string+0x5/0x10
> [   77.559526]  [<ffffffffa04845b0>] ?
> VBoxDrvLinuxIOCtl_5_0_20+0x150/0x250 [vboxdrv]
> [   77.560133]  [<ffffffff81241648>] ? do_vfs_ioctl+0x298/0x480
> [   77.560593]  [<ffffffff81338393>] ? security_file_ioctl+0x43/0x60
> [   77.561081]  [<ffffffff812418a9>] ? SyS_ioctl+0x79/0x90
> [   77.561503]  [<ffffffff817a0f2e>] ?
entry_SYSCALL_64_fastpath+0x12/0x71
> [   77.562033] Code: 88 e4 fc ff ff b9 3a 00 00 00 0f 32 48 c1 e2 20
> 89 c0 48 09 d0 48 89 05 f9 db 0e 00 0f 20 e0 b9 9b 00 00 00 48 89 05
> d2 db 0e 00 <0f> 32 48 c1 e2 20 89 c0 b9 80 00 00 c0 48 09 d0 48 89
05
> cb db
> [   77.564260] RIP  [<ffffffffa05ee506>] 0xffffffffa05ee506
> [   77.564701]  RSP <ffff8800b4fdfd70>
> [   77.565103] ---[ end trace 9cf480524482767b ]---
>