Re: [Xen-users] Xen - Linux PV on HVM drivers

[Alex <alex@xxxxxxxxxx>]

Hi Fajar,

Thank you for your reply. I have tried including those modules into my 
initrd, however I am getting an error. I took a screenshot of the VNC 
session:
http://ahhyes.net/xenerror.png

Any ideas?


On Tue, 21 Jun 2011 14:28:12 +0700, Fajar A. Nugraha wrote:
> On Tue, Jun 21, 2011 at 1:37 PM, Alex <alex@xxxxxxxxxx> wrote:
> > Hi Guys,
> >
> > Is there a way to get Xen PV-on-HVM drivers for Linux HVM guests 
> > working on
> > ubuntu server 11.04 x86_64?
> It works. Sort of.
>
> > I am using Ubuntu server on my Xen HVM VPS. It would be nice to use 
> > the PV
> > drivers for HVM to take advantage of performance improvements.
> >
> > I am running a custom kernel 2.6.39.1 and have enabled Xen support 
> > in the
> > kernel (under "Processor type and features" -> "Paravirtualized 
> > guest
> > support" -> "Xen guest support"
> >
> > However it appears this is not working, it's not using the PV-on-HVM 
> > drivers
> > (still using the QEMU detected stuff).
> >
> > Quote:
> > ------
> > root@srv:/usr/src/linux# dmesg | grep -i xen
> >
> > Linux version 2.6.39.1-customserver-xen (root@xxxxxxxxxxxxxxxx) (gcc 
> > version
> > 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4) ) #1 SMP PREEMPT Sun Jun 19 
> > 16:41:16
> > EST 2011
> > DMI: Xen HVM domU, BIOS 3.4.3 01/22/2011
> > ACPI: RSDP 00000000000ea020 00024 (v02 Xen)
> > ACPI: XSDT 00000000fc006060 00034 (v01 Xen HVM 00000000 HVML 
> > 00000000)
> > ACPI: FACP 00000000fc005ee0 000F4 (v04 Xen HVM 00000000 HVML 
> > 00000000)
> > ACPI: DSDT 00000000fc002c40 0321F (v02 Xen HVM 00000000 INTL 
> > 20090220)
> > ACPI: APIC 00000000fc005fe0 00080 (v02 Xen HVM 00000000 HVML 
> > 00000000)
> > XENFS: not registering filesystem on non-xen platform
> The trick is you need to make sure that xen-platform-pci is loaded
> BEFORE xen-blkfront loaded. This makes natty's linux-image-virtual
> unusable for PVonHVM since xen-blkfront is compiled in, while
> xen-platform-pci is compiled as module. Using linux-image-server, and
> adding these entrie, make it work:
>
> # cat /etc/initramfs-tools/modules
> xen-platform-pci
> xen-blkfront
>
> Here's the result:
>
> # dmesg | egrep -i "xen|blkfront"
> [    0.000000] DMI: Xen HVM domU, BIOS 4.0.1-1.pv_ops.el5 01/13/2011
> [    0.000000] Hypervisor detected: Xen HVM
> [    0.000000] Xen version 4.0.
> [    0.000000] Xen Platform PCI: I/O protocol version 1
> [    0.000000] Netfront and the Xen platform PCI driver have been
> compiled for this kernel: unplug emulated NICs.
> [    0.000000] Blkfront and the Xen platform PCI driver have been
> compiled for this kernel: unplug emulated disks.
> [    0.000000] ACPI: RSDP 00000000000ea020 00024 (v02    Xen)
> [    0.000000] ACPI: XSDT 00000000fc012cb0 00034 (v01    Xen      HVM
> 00000000 HVML 00000000)
> [    0.000000] ACPI: FACP 00000000fc012ad0 000F4 (v04    Xen      HVM
> 00000000 HVML 00000000)
> [    0.000000] ACPI: DSDT 00000000fc002c40 0FE0B (v02    Xen      HVM
> 00000000 INTL 20090123)
> [    0.000000] ACPI: APIC 00000000fc012bd0 000D8 (v02    Xen      HVM
> 00000000 HVML 00000000)
> [    0.000000] Booting paravirtualized kernel on Xen
> [    0.000000] Xen HVM callback vector for event delivery is enabled
> [    0.210018] Xen: using vcpuop timer interface
> [    0.210029] installing Xen timer for CPU 0
> [    0.020000] installing Xen timer for CPU 1
> [    0.020000] installing Xen timer for CPU 2
> [    0.020000] installing Xen timer for CPU 3
> [    0.020000] installing Xen timer for CPU 4
> [    0.020000] installing Xen timer for CPU 5
> [    1.526585] Switching to clocksource xen
> [    4.861230] xen-platform-pci 0000:00:03.0: PCI INT A -> GSI 28
> (level, low) -> IRQ 28
> [    5.006193] blkfront device/vbd/51712 num-ring-pages 1 nr_ents 32.
> [    5.013080] blkfront: xvda: barriers enabled
> [    5.038129] blkfront device/vbd/51728 num-ring-pages 1 nr_ents 32.
> [    5.075300] blkfront: xvdb: barriers enabled
> [   15.673938] Initialising Xen virtual ethernet driver.
> [   22.996610] blkfront: xvda: empty write barrier op failed
> [   22.996618] blkfront: xvda: barriers disabled
>
>
> # lsmod | grep xen
> xen_netfront           26568  0
> xen_blkfront           22122  5
> xenbus_probe_frontend    13194  2 
> xen_netfront,xen_blkfront,[permanent]
> xen_platform_pci       12836  0 [permanent]
>
> If you use custom kernel, either compile them all as builtin, or make
> sure xen-platform-pci is loaded.

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