Kernel 3.0 and Xen [new features]

Message

pablolibo · Post by **pablolibo** » Fri Aug 12, 2011 11:43 pm

Hello everybody,

I am currently having a problem with gentoo-sources 3.0 , I am not found the new features on the combatibilidad between xen and kernel 3.0 . Does anyone know how enable DOM0 (xen) in new kernel 3.0?

Any idea?

Thanks in advances

fbcyborg · Post by **fbcyborg** » Mon Aug 22, 2011 12:20 pm

Hi!

As far as I know you can do as usual. Enable the following:

Code: Select all

Processor type and features  --->
	[*] Paravirtualized guest support  --->
		[*]   Xen guest support

then:

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Device Drivers  --->
	Xen driver support  --->
		[*] Xen memory balloon driver (NEW)
		[*]   Scrub pages before returning them to system (NEW)
		<*> Xen /dev/xen/evtchn device (NEW)
		[*] Backend driver support (NEW)
		<*> Xen filesystem (NEW)
		[*]   Create compatibility mount point /proc/xen (NEW)
		[*] Create xen entries under /sys/hypervisor (NEW)
		<M> userspace grant access device driver (NEW)
		<M> User-space grant reference allocator driver (NEW)
		<M> xen platform pci device driver (NEW)
	[*] Network device support  --->
		< >   Xen network device frontend driver
		<*>   Xen backend network device

Try and let me know please.

fbcyborg · Post by **fbcyborg** » Tue Aug 30, 2011 6:58 am

Also the following is necessary:

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Device Drivers  --->
	[*] Block devices  --->
		<*>   Xen virtual block device support
		<*>   Xen block-device backend driver

Networking support  --->
	Networking options  --->
		<M> 802.1d Ethernet Bridging

I tried to start a VM and I had no one problem with this configuration.

maurs · Post by **maurs** » Fri Oct 21, 2011 7:14 pm

fbcyborg wrote:Also the following is necessary:
Code: Select all
Device Drivers  --->
	[*] Block devices  --->
		<*>   Xen virtual block device support
		<*>   Block-device backend driver

Networking support  --->
	Networking options  --->
		<M> 802.1d Ethernet Bridging
I tried to start a VM and I had no one problem with this configuration.

thank you for posting this kernel configuration

themightychris · Post by **themightychris** » Fri Nov 11, 2011 7:05 pm

What changes are necessary for compiling a domU kernel? I haven't been able to disable the dom0 or privileged domain config flags or find any up to date documentation online.

I tried using menuconfig to disable the backend drivers but my domU boot hangs at "XENBUS: Waiting for devices to initialise"

here's the relevant bits of my .config:

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linux-3.0.6-gentoo-domU # grep XEN .config
CONFIG_XEN=y
CONFIG_XEN_DOM0=y
CONFIG_XEN_PRIVILEGED_GUEST=y
CONFIG_XEN_PVHVM=y
CONFIG_XEN_MAX_DOMAIN_MEMORY=128
CONFIG_XEN_SAVE_RESTORE=y
# CONFIG_XEN_DEBUG_FS is not set
# CONFIG_XEN_DEBUG is not set
CONFIG_PCI_XEN=y
CONFIG_XEN_PCIDEV_FRONTEND=y
CONFIG_XEN_BLKDEV_FRONTEND=y
# CONFIG_NETXEN_NIC is not set
CONFIG_XEN_NETDEV_FRONTEND=y
CONFIG_INPUT_XEN_KBDDEV_FRONTEND=y
CONFIG_HVC_XEN=y
# CONFIG_XEN_WDT is not set
CONFIG_XEN_FBDEV_FRONTEND=y
CONFIG_XEN_BALLOON=y
CONFIG_XEN_SCRUB_PAGES=y
CONFIG_XEN_DEV_EVTCHN=y
# CONFIG_XEN_BACKEND is not set
CONFIG_XENFS=y
CONFIG_XEN_COMPAT_XENFS=y
CONFIG_XEN_SYS_HYPERVISOR=y
CONFIG_XEN_XENBUS_FRONTEND=y
CONFIG_XEN_GNTDEV=m
CONFIG_XEN_GRANT_DEV_ALLOC=m
CONFIG_XEN_PLATFORM_PCI=m
CONFIG_SWIOTLB_XEN=y

Am I missing something?

fbcyborg · Post by **fbcyborg** » Fri Nov 11, 2011 8:00 pm

themightychris wrote:Am I missing something?

No, I don't think so.
This is mine, and it works:

Code: Select all

CONFIG_XEN=y
CONFIG_XEN_DOM0=y
CONFIG_XEN_PRIVILEGED_GUEST=y
CONFIG_XEN_PVHVM=y
CONFIG_XEN_MAX_DOMAIN_MEMORY=128
CONFIG_XEN_SAVE_RESTORE=y
# CONFIG_XEN_DEBUG_FS is not set
# CONFIG_XEN_DEBUG is not set
CONFIG_PCI_XEN=y
CONFIG_XEN_PCIDEV_FRONTEND=y
CONFIG_XEN_BLKDEV_FRONTEND=y
# CONFIG_NETXEN_NIC is not set
CONFIG_XEN_NETDEV_FRONTEND=y
CONFIG_INPUT_XEN_KBDDEV_FRONTEND=y
CONFIG_HVC_XEN=y
# CONFIG_XEN_WDT is not set
CONFIG_XEN_FBDEV_FRONTEND=y
CONFIG_XEN_BALLOON=y
CONFIG_XEN_SCRUB_PAGES=y
# CONFIG_XEN_DEV_EVTCHN is not set
# CONFIG_XEN_BACKEND is not set
# CONFIG_XENFS is not set
# CONFIG_XEN_SYS_HYPERVISOR is not set
CONFIG_XEN_XENBUS_FRONTEND=y
# CONFIG_XEN_GNTDEV is not set
CONFIG_XEN_GRANT_DEV_ALLOC=m
CONFIG_XEN_PLATFORM_PCI=m
CONFIG_SWIOTLB_XEN=y

Yours looks very similar to mine.

richard.scott · Post by **richard.scott** » Mon Apr 16, 2012 11:49 am

Do you have to change or add anything to grub to get the hypervisor/dom0 features?

fbcyborg · Post by **fbcyborg** » Mon Apr 16, 2012 11:51 am

Yes, you may look for an example here.

richard.scott · Post by **richard.scott** » Mon Apr 16, 2012 12:01 pm

thanks, I'll take a look.