xen July 2013

xen@lists.fedoraproject.org

4 participants
4 discussions

execute commands from dom0 into domU
by silviu d 06 Jun '15

06 Jun '15

Hello, I was wondering if there is a way to execute commands from dom0 into domU without loging into domU with ssh. thanks

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xen 4.3.0 on Fedora 20
by M A Young 17 Jul '13

17 Jul '13

I have now updated xen on Fedora 20 to version 4.3.0. I have built it with the XSM/FLASK security subsystem available if you add a xenpolicy file as a module in the grub configuration. Note that the xen-hypervisor package on i686 is currently empty because it was dropped in this version, but a 32-bit dom0 should work on a 64-bit hypervisor if your hardware supports it. Michael Young

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How to log system calls from a PV DomU under Xen
by ranjith krishnan 16 Jul '13

16 Jul '13

Hello, I was posting a couple weeks back here, asking questions about getting DomUs working in Xen when installing Xen from source. Well, I have managed to get things working. Currently my setup is like this now. Xen 4.2.2, installed from source, Fedora 18 Dom0 x86_64, Debian 6 PV DomU x86_64, and Ubuntu 12.04 HVM DomU x86_64. My processor has Intel VT-X enabled. I used xl/xm to create DomUs. I was unable to get virt-manager working to create guests. I faced a similar problem with Xen 4.1 and Fedora 17 earlier. As the next step in my project, I want to log some system call information. Basically, every time a system call is made in my PV DomU, I just want to print a line like "System call made from DomU, systemcall id = xx". That is all I need for now. I have some questions regarding the same. 1. This might be a stupid question, but here goes. After I modify source code, should I do the whole compilation/install process to see my changes. ie. should i do "make and install xen, tools and stubdom" or will "make and install xen" suffice ? 2. How is the system call flow happening in Xen? Where in the code is the system call being intercepted by the hypervisor for a PV DomU. ? I found some information from this paper, http://hal.archives-ouvertes.fr/docs/00/43/10/31/PDF/Technical_Report_Sysca… but still am not clear about the whole picture. Is there documentation available explaining for how system calls are handled in Xen ? The Xen code is quite large, and I am sorry to say I get lost reading it without some kind of knowledge. 3. How to log data? I see printk statements in the code. Are printk statements tied to a certain logging level ? Should I add "loglvl=all guest_loglvl=all" to my Dom0 grub to see the output from printk statements ? Also, which output file should I be seeing for my scenario? /var/log/xen/xend.log ? I apologize for the long email. Please take some time out and kindly reply. -- Ranjith krishnan

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Xen 4.3 released!
by Dario Faggioli 09 Jul '13

09 Jul '13

Go get it! :-) -------- Forwarded Message -------- From: George Dunlap To: xen-devel@, xen-users@ Date: Tue, 9 Jul 2013 14:01:17 +0100 The Xen Project team is pleased to announce the release of Xen 4.3. The result of nearly 10 of development, new features include: * Early support for ARM 32- and 64-bit architectures * qemu-upstream is now the default for VMs not using stub domains. * openvswitch hot-plug script support. * NUMA affinity for the scheduler * xl can now accept several USB devices, rather than only one. * XSM improvements. XSM can now override all IS_PRIV checks in the hypervisor. * As always, a number of stability, performance, and security enhancements "under the hood". Detailed release notes, including a more extensive feature list: http://wiki.xenproject.org/wiki/Xen_4.3_Release_Notes To download tarballs: http://www.xenproject.org/downloads/xen-archives/supported-xen-43-series/xe… Or the git source repository (tag 'RELEASE-4.3.0'): http://xenbits.xen.org/gitweb/?p=xen.git And the announcement on the Xen blog: http://blog.xen.org/index.php/2013/07/09/xen-4-3-0-released/ Thanks to the many people who have contributed to this release! Regards, The Xen Project Team -- <<This happens because I choose it to happen!>> (Raistlin Majere) ----------------------------------------------------------------- Dario Faggioli, Ph.D, http://about.me/dario.faggioli Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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xen July 2013