similar to: DomU to Dom0 Communication in Xen HVM?

Can the XenStore database be accessed by domU''s? If so, could it be used to pass small amounts of data back and forth between dom0 and domU''s using XenStore key entries? If this is possible, it would seem that this could eliminate the need to create a "device" driver for a simple communication path. Also, what type of Guest Fedora Kernel would be needed to

Hello, I guess it possible distro specific issue but is it resolvable? I have one node(testing purpose) ganeti 2.0.1 cluster installed over Debian5 Lenny. Almost everything from distro repositories. Only ganeti 2.0.1 and ganeti-debootstrap are from sources. I have it successful run with vmlinuz-2.6.26-2-xen-686 and initrd.img-2.6.26-2-xen-686 from repositories. Both Dom0 and DomU are use the

Hi, I am trying to run libvchan on ARM Fast Model for VExpress platform for using inter domain communication. But there are some errors. I am attaching the strace outputs for vchan-node1 run in dom0 and domU. Has anybody faced these issues before. Xl console 1The command is Usage: vchan-node1 [client|server] [write|read] domid nodepath my nodepath is - /local/domain/1/data/vchan-2-1 Regards

I accidentally realized today that any domU''s using the paravirt disk driver potentially suffer from poor performance when they get handed in a physical volume and partitioning is done inside the guest. The physical volume passed in has to be one that has the compat 512 logical sector size but hints its real sector size (eg. 4096) as physical sector size. In dom0 handling is correct and

Add xs_reset_watches function to shutdown watches from old kernel after kexec boot. The old kernel does not unregister all watches in the shutdown path. They are still active, the double registration can not be detected by the new kernel. When the watches fire, unexpected events will arrive and the xenwatch thread will crash (jumps to NULL). An orderly reboot of a hvm guest will destroy the

Changes: tools/blktap: remove unneeded pointer dereferencing in convert_dev_name_to_num tools/blktap: constify string arrays in convert_dev_name_to_num tools/blktap: fix params and physical-device parsing tools/blktap: remove unneeded pointer dereferencing from img2qcow.c tools/blktap: remove unneeded pointer dereferencing from qcow2raw.c tools/blktap2: fix build errors caused by Werror in

Subject: Re: [CentOS-virt] Xen4CentOS kernel panic on dom0 reboot On Wed, Mar 5, 2014 at 10:17 AM, David Vrabel <david.vrabel at citrix.com>wrote: > > On 05/03/14 15:09, Karl Johnson wrote: > > > I've been using Xen4CentOS for the last 3 months. It's working fine and > > > dom0/domUs are stable but the server does a kernel panic when doing a > > >

Hi, In domU, we can''t use xenbus to access anything outside of the domain''s home. That means we are being restricted from reading/writing to other domain''s xenstore. That is perfectly fine, and nobody complains here. But in dom0, do we have the exception? Since dom0 is trusted, I think we can be allowed to access to all other domU''s xenstore. Is that

I have a kickstart file created that works great for installing CentOS on PVM''s and now I want to use it for HVM''s as well. The problem is that when I attempt to run the install, it seems to ignore the kickstart and starts prompting me for all the things I already have specified in the kickstart. Any idea what I could be doing wrong? Here is the command im using to get things

Dear All, The "clients.txt" file of the latest Rserve package, by Simon Urbanek, says, regarding its R client, "(...) a simple R client, i.e. it allows you to connect to Rserve from R itself. It is very simple and limited, because Rserve was not primarily meant for R-to-R communication (there are better ways to do that), but it is useful for quick interactive connection to an

# HG changeset patch # User Ian Campbell <ian.campbell@citrix.com> # Date 1322568055 0 # Node ID 6da8c30fb198adc15136a867a8303b7de3804bcf # Parent fa9deee858b84d4c4fbb5f9523fa5adb7aac3a35 docs: XenBus page has been transfered to new wiki Signed-off-by: Ian Campbell <Ian.Campbell@citrix.com> diff -r fa9deee858b8 -r 6da8c30fb198 docs/misc/xenstore.txt --- a/docs/misc/xenstore.txt Tue

Hi, I am trying to (live-)migrate a paravirtualized machine from hosta to hostb: -----8<---- hosta:~ # xm list pvm Name ID Mem VCPUs State Time(s) pvm 64 384 1 -b---- 0.5 hostb:~ # xm list pvm Error: Domain ''pvm'' does not exist. hosta:~ # xm migrate pvm 192.168.0.2 Error:

Hi, This patch series fixes the S3 resume of a domain running xenstored and a frontend over xenbus (xen-netfront in my use case). As device resume is happening before process resume, the xenbus frontend resume is hanging if xenstored is not running, thus causing a deadlock. This patch series is fixing that issue by deferring the xenbus frontend resume when we are running xenstored in that same

Xen-users, I have what I think is a bug in the serial console interaction of Xen and Ubuntu. Essentially, the serial console appears to work just fine until it is passed off to dom 0 from Xen. Then it stops communicating with dom0, but still communicates with Xen, if I use the control-A escape sequence. Google will not show me anything related to this. I have local RS-232 serial console working

Hello, This patch allows userspace tools on a domU to setup a watch on the xenstore. It does this by intercepting XS_WATCH requests written to /proc/xen/xenbus and then re-submitting the request to the in-kernel xenstore interface, in linux-2.6-xen-sparse/drivers/xen/xenbus/xenbus_xs.c. When a callback occurs, an in-kernel function is invoked, which then reconstructs a response in the format

to convert hvm to pv guest, I have followed the direction( link<http://pastebin.com/f6a5022bf>) in Xen-Users Common Questions Guide. It says the first step is "install kernel-xen with correct initrd" After "yum install kernel-xen" was executed, following errors were showed: WARNING: No module xen_vbd found for kernel 2.6.18-164.15.1.el5xen, continuing anyway grubby

Hi all, I am creating a CentOS 5.1 Paravirtualized guest On Xen 3.2.1 / Fedora 8 Dom0. I built DomU kernel from the Xen Linux 2.6.18.8 source. I also created an initrd image (I face some problems there as I had to manually copy some modules line xennet, ahci and libata). Anyway, I dounloaded the CentOS5.1 image from http://jailtime.org/ and copied it to a new partition. When I create the

Hi, does anybody know how to use the dual processors in the machines of a cluster? I am using R with rpvm and snow packages. I usually start pvm daemon and add host machines first, and then run R to start my computing work. But I find that only one processor in each machine is used in this way and the other one always stays idle. Is there any simple way to tell pvm to use the two processors at

Dear xen-devel, There''s a race condition in xenfs (xenstore driver) that causes userspace utility xenstore-watch to crash. Normally, the userspace process gets an "OK" from xenfs and then the watch fires immediately after. Occasionally, this happens the other way around: the watch fires before the driver sends "OK", which confuses the xenstore-watch client. It seems

Caveat: I've only played with this a couple of years ago... I believe you can just add each host _twice_ (or as many times as the number of CPUs at that host) to get both CPUs to work. Andy From: Paul Y. Peng > > Hi, > > does anybody know how to use the dual processors in the > machines of a cluster? I am using R with rpvm and snow > packages. I usually start pvm