[Xen-devel] Testing nested virtualization on Intel CPUs

[AP <apxeng@xxxxxxxxx>]

I am testing out nested virtualization on a Lenovo x220 (Intel
i7-2620M). I am running xen-unstable (23842:483c5f8319ad) and Linux
3.0 (Ubuntu 10.10).
I brought up a Centos 5.6 VM and installed Xen that is packaged with
it. I think it is a variant of 3.0. The CentOS Xen VM boots very
slowly but it does finally come up in to the nested Dom0. Now when I
do an "xm create" of an HVM domain I just get a blank sdl screen. I
don't even see the bios screen. Are there any more patches that I need
to be adding to get this to work?

I have also included some log output. Please let me know if you need
any other info.

Thanks,
AP

Config of nested hypervisor VM
=======================
kernel = "hvmloader"
builder='hvm'
memory = 1024
name = 'centos'
vcpus = 1
pae = 1
acpi = 1
apic = 1
vif = [ 'bridge=br0' ]
disk = ['phy:/dev/vollumvg/centos,hda,w', 'phy:/dev/vollumvg/centosfi,hdb,w']
device_model = 'qemu-dm'
vnc = 0
sdl = 1
stdvga = 1
serial = 'pty'
monitor=1
usb=1
videoram = 16
nestedhvm = 1

Host Xen messages during nested hypervisor Xen VM boot
---------------------------------------------------------------------------------------
(XEN) HVM2: HVM Loader
(XEN) HVM2: Detected Xen v4.2-unstable
(XEN) HVM2: Xenbus rings @0xfeffc000, event channel 2
(XEN) HVM2: System requested ROMBIOS
(XEN) HVM2: CPU speed is 2691 MHz
(XEN) irq.c:269: Dom2 PCI link 0 changed 0 -> 5
(XEN) HVM2: PCI-ISA link 0 routed to IRQ5
(XEN) irq.c:269: Dom2 PCI link 1 changed 0 -> 10
(XEN) HVM2: PCI-ISA link 1 routed to IRQ10
(XEN) irq.c:269: Dom2 PCI link 2 changed 0 -> 11
(XEN) HVM2: PCI-ISA link 2 routed to IRQ11
(XEN) irq.c:269: Dom2 PCI link 3 changed 0 -> 5
(XEN) HVM2: PCI-ISA link 3 routed to IRQ5
(XEN) HVM2: pci dev 01:2 INTD->IRQ5
(XEN) HVM2: pci dev 01:3 INTA->IRQ10
(XEN) HVM2: pci dev 03:0 INTA->IRQ5
(XEN) HVM2: pci dev 04:0 INTA->IRQ5
(XEN) HVM2: pci dev 02:0 bar 10 size 01000000: f0000008
(XEN) HVM2: pci dev 03:0 bar 14 size 01000000: f1000008
(XEN) HVM2: pci dev 03:0 bar 10 size 00000100: 0000c001
(XEN) HVM2: pci dev 04:0 bar 10 size 00000100: 0000c101
(XEN) HVM2: pci dev 04:0 bar 14 size 00000100: f2000000
(XEN) HVM2: pci dev 01:2 bar 20 size 00000020: 0000c201
(XEN) HVM2: pci dev 01:1 bar 20 size 00000010: 0000c221
(XEN) HVM2: Multiprocessor initialisation:
(XEN) HVM2:  - CPU0 ... 36-bit phys ... fixed MTRRs ... var MTRRs
[2/8] ... done.
(XEN) HVM2: Testing HVM environment:
(XEN) HVM2:  - REP INSB across page boundaries ... passed
(XEN) HVM2:  - GS base MSRs and SWAPGS ... passed
(XEN) HVM2: Passed 2 of 2 tests
(XEN) HVM2: Writing SMBIOS tables ...
(XEN) HVM2: Loading ROMBIOS ...
(XEN) HVM2: 9724 bytes of ROMBIOS high-memory extensions:
(XEN) HVM2:   Relocating to 0xfc000000-0xfc0025fc ... done
(XEN) HVM2: Creating MP tables ...
(XEN) HVM2: Loading Standard VGABIOS ...
(XEN) HVM2: Loading PCI Option ROM ...
(XEN) HVM2:  - Manufacturer: http://etherboot.org
(XEN) HVM2:  - Product name: gPXE
(XEN) HVM2: Loading ACPI ...
(XEN) HVM2: vm86 TSS at fc012800
(XEN) HVM2: BIOS map:
(XEN) HVM2:  c0000-c9fff: VGA BIOS
(XEN) HVM2:  ca000-d7fff: Etherboot ROM
(XEN) HVM2:  f0000-fffff: Main BIOS
(XEN) HVM2: E820 table:
(XEN) HVM2:  [00]: 00000000:00000000 - 00000000:0009e000: RAM
(XEN) HVM2:  [01]: 00000000:0009e000 - 00000000:000a0000: RESERVED
(XEN) HVM2:  HOLE: 00000000:000a0000 - 00000000:000e0000
(XEN) HVM2:  [02]: 00000000:000e0000 - 00000000:00100000: RESERVED
(XEN) HVM2:  [03]: 00000000:00100000 - 00000000:3f000000: RAM
(XEN) HVM2:  HOLE: 00000000:3f000000 - 00000000:fc000000
(XEN) HVM2:  [04]: 00000000:fc000000 - 00000001:00000000: RESERVED
(XEN) HVM2: Invoking ROMBIOS ...
(XEN) HVM2: $Revision: 1.221 $ $Date: 2008/12/07 17:32:29 $
(XEN) stdvga.c:147:d2 entering stdvga and caching modes
(XEN) HVM2: VGABios $Id: vgabios.c,v 1.67 2008/01/27 09:44:12 vruppert Exp $
(XEN) HVM2: VBE Bios $Id: vbe.c,v 1.60 2008/03/02 07:47:21 vruppert Exp $
(XEN) HVM2: Bochs BIOS - build: 06/23/99
(XEN) HVM2: $Revision: 1.221 $ $Date: 2008/12/07 17:32:29 $
(XEN) HVM2: Options: apmbios pcibios eltorito PMM
(XEN) HVM2:
(XEN) HVM2: ata0-0: PCHS=16383/16/63 translation=lba LCHS=1024/255/63
(XEN) HVM2: ata0 master: QEMU HARDDISK ATA-7 Hard-Disk (10240 MBytes)
(XEN) HVM2: ata0-1: PCHS=10402/16/63 translation=lba LCHS=652/255/63
(XEN) HVM2: ata0  slave: QEMU HARDDISK ATA-7 Hard-Disk (5120 MBytes)
(XEN) HVM2:
(XEN) HVM2:
(XEN) HVM2:
(XEN) HVM2: Press F12 for boot menu.
(XEN) HVM2:
(XEN) HVM2: Booting from Hard Disk...
(XEN) HVM2: Booting from 0000:7c00
(XEN) HVM2: int13_harddisk: function 41, unmapped device for ELDL=82
(XEN) HVM2: int13_harddisk: function 08, unmapped device for ELDL=82
(XEN) HVM2: *** int 15h function AX=00c0, BX=0000 not yet supported!
(XEN) HVM2: int13_harddisk: function 02, unmapped device for ELDL=82
(XEN) HVM2: int13_harddisk: function 41, unmapped device for ELDL=82
(XEN) irq.c:269: Dom2 PCI link 0 changed 5 -> 0
(XEN) irq.c:269: Dom2 PCI link 1 changed 10 -> 0
(XEN) irq.c:269: Dom2 PCI link 2 changed 11 -> 0
(XEN) irq.c:269: Dom2 PCI link 3 changed 5 -> 0


Nested Xen Messages during nested VM boot
-------------------------------------------------------------------
(XEN) sysctl.c:51: Allowing physinfo call with newer ABI version
(XEN) sysctl.c:51: Allowing physinfo call with newer ABI version
(XEN) sysctl.c:51: Allowing physinfo call with newer ABI version
(XEN) sysctl.c:51: Allowing physinfo call with newer ABI version
(XEN) sysctl.c:51: Allowing physinfo call with newer ABI version
(XEN) sysctl.c:51: Allowing physinfo call with newer ABI version
(XEN) memory.c:124:d0 Could not allocate order=9 extent: id=1
memflags=0 (0 of 1)
(XEN) memory.c:124:d0 Could not allocate order=9 extent: id=1
memflags=0 (0 of 1)
(XEN) memory.c:124:d0 Could not allocate order=9 extent: id=1
memflags=0 (0 of 1)
(XEN) memory.c:124:d0 Could not allocate order=9 extent: id=1
memflags=0 (0 of 1)

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