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

[Alex <alex@xxxxxxxxxx>]

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?

I had a read of 
http://wiki.xensource.com/xenwiki/XenLinuxPVonHVMdrivers and found out:
Quote:
------
"Xen PV-on-HVM drivers were merged to upstream kernel.org Linux 2.6.36, 
and various optimizations added in Linux 2.6.37"
-------------

I assume this means that every kernel since 2.3.36 has the code merged 
in?
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

Quote:
------

root@srv:/usr/src/linux# lspci | grep -i xen
00:03.0 Unassigned class [ff80]: XenSource, Inc. Xen Platform Device 
(rev 01)
is there extra kernel params needed to make this work?

Any info to point me in the right direction appreciated.

Thanks


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