[libvirt] How to pass not xml parameters from Libvirt to Xen in xml definition
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi everybody, i need to define cpuid parameter for a specific Xen Virtual Machine. This parameters doesn't exist in libvirt definition. So how can i add this "unknow" parameter in virtual machine's xml definition to be able to manage it from virt-manager? regards, - -- Alexandre CABROL PERALES - -- Ingenieur Securite des Systemes d'Information Mob. : 06.98.82.03.06 Mail : alexandre.cabrol@artal.fr Key fingerprint = 1E6B B8DF 5001 A6A8 E057 9D31 7B3B EAB1 4AE4 8953 - -- ARTAL Technologies Rue Pierre-Gilles de Gennes Ens."La Rue", Bat. 9, BP 38138 31681 Labege cedex Tel. : 05.61.00.39.30 Fax : 05.61.00.20.43 -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.10 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkpgSWsACgkQezvqsUrkiVMqiwCgkigm/WZ5TPToQ7RzdY0R6UJz tEAAoKIcdZ2fO5PdqZdcrzuTj6Ev4yh4 =8rlJ -----END PGP SIGNATURE-----
On Fri, Jul 17, 2009 at 11:50:35AM +0200, Alexandre CABROL PERALES wrote:
Hi everybody, i need to define cpuid parameter for a specific Xen Virtual Machine. This parameters doesn't exist in libvirt definition.
So how can i add this "unknow" parameter in virtual machine's xml definition to be able to manage it from virt-manager?
There is no such bypass mechanism. If the feature us needed, then it need to be recognized and supported at the libvirt API level, in order to keep interface coherents and protect from hypervisor specifics or changes in said hypervisors. You need to explain why this parameter makes sense at the API level, if it is generic enough support will be added (we usually take patches). If this is a workaround against a problem or a deficiency in a specific version of the hypervisor, the workaround is usually implemented in the libvirt driver but not exposed at the API level. The goal is to abstract and alleviate problems, not to inflict them permanently. Daniel -- Daniel Veillard | libxml Gnome XML XSLT toolkit http://xmlsoft.org/ daniel@veillard.com | Rpmfind RPM search engine http://rpmfind.net/ http://veillard.com/ | virtualization library http://libvirt.org/
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 CPUID parameters is feature from Xen 3.3 which able to define custom cpu identification for guest OS in HVM mode. It's required for Windows NT installation for example. Or any system which required a specific cpu. It can be used also to tune performe of physical cpus by guest OS. This is an example of CPUID usage: # Intel(R) Pentium(R) 4 CPU cpuid = [ '0x00000000:eax=0x00000002,ebx=0x756e6547,ecx=0x6c65746e,edx=0x49656e69', '0x00000001:eax=0x00000f12,ebx=0x00010808,ecx=0x00000000,edx=0x3febfbff', '0x00000002:eax=0x665b5001,ebx=0x00000000,ecx=0x00000000,edx=0x007a7040', '0x80000000:eax=0x80000004,ebx=0x00000000,ecx=0x00000000,edx=0x00000000', '0x80000001:eax=0x00000000,ebx=0x00000000,ecx=0x00000000,edx=0x00000000', '0x80000002:eax=0x20202020,ebx=0x20202020,ecx=0x20202020,edx=0x6e492020', '0x80000003:eax=0x286c6574,ebx=0x50202952,ecx=0x69746e65,edx=0x52286d75', '0x80000004:eax=0x20342029,ebx=0x20555043,ecx=0x30352e31,edx=0x007a4847' ] It show Identification of Intel Pentium 4 Processor. This feature is xen specific but usefull and exist in Xen 3.4 and probably futures too. Daniel Veillard a écrit :
On Fri, Jul 17, 2009 at 11:50:35AM +0200, Alexandre CABROL PERALES wrote:
Hi everybody, i need to define cpuid parameter for a specific Xen Virtual Machine. This parameters doesn't exist in libvirt definition.
So how can i add this "unknow" parameter in virtual machine's xml definition to be able to manage it from virt-manager?
There is no such bypass mechanism. If the feature us needed, then it need to be recognized and supported at the libvirt API level, in order to keep interface coherents and protect from hypervisor specifics or changes in said hypervisors.
You need to explain why this parameter makes sense at the API level, if it is generic enough support will be added (we usually take patches). If this is a workaround against a problem or a deficiency in a specific version of the hypervisor, the workaround is usually implemented in the libvirt driver but not exposed at the API level. The goal is to abstract and alleviate problems, not to inflict them permanently.
Daniel
- -- Alexandre CABROL PERALES - -- Ingenieur Securite des Systemes d'Information Mob. : 06.98.82.03.06 Mail : alexandre.cabrol@artal.fr Key fingerprint = 1E6B B8DF 5001 A6A8 E057 9D31 7B3B EAB1 4AE4 8953 - -- ARTAL Technologies Rue Pierre-Gilles de Gennes Ens."La Rue", Bat. 9, BP 38138 31681 Labege cedex Tel. : 05.61.00.39.30 Fax : 05.61.00.20.43 -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.10 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkpgixEACgkQezvqsUrkiVM+GACglNofFYpgX6NvBhnIa6d/pHA6 YbQAn1gRJyRgpPAGuGHqKMaT0tIUm1ui =yTtw -----END PGP SIGNATURE-----
participants (2)
-
Alexandre CABROL PERALES -
Daniel Veillard