search for: xen_project_software_overview

Hello @ all, i wonder if there is any support for Xen PVH (https://wiki.xen.org/wiki/Xen_Project_Software_Overview) within libvirt. If i parse a xen native domU config file with 'virsh domxml-from-native' in which i set type='pvh' it changes it in the libvirt xml output to normal pv. Also the docs of libvirt do not state something like pvh. I am currently running Xen 4.10.0 with LibVirt 4.0.0....

...is that modern kernel images can be compiled with Xen PV guest support and the same image can also boot on baremetal, KVM or Xen HVM. Testing if the xennet (or xen-netfront) module exists is irrelevant to this. This test, which is based on ideas from Laszlo Ersek and https://wiki.xen.org/wiki/Xen_Project_Software_Overview#Guest_Types uses the kernel config test CONFIG_X86_XEN || CONFIG_X86_64_XEN to determine PV-only kernels. Updates commit 7eb219d1938968c4d6bffda038aaace936f7efbf. Thanks: Laszlo Ersek. --- v2v/convert_linux.ml | 4 ++-- v2v/linux_kernels.ml | 10 ++++++---- v2v/linux_kernels.mli | 2 +- 3 f...

...hance. Modern kernel images can be compiled with Xen PV guest support. The same image can boot on baremetal, KVM, Xen PV or Xen HVM. Testing if the xennet (or xen-netfront) module exists is irrelevant to this. This test, which is based on ideas from Laszlo Ersek and https://wiki.xen.org/wiki/Xen_Project_Software_Overview#Guest_Types uses the kernel config test CONFIG_X86_XEN || CONFIG_X86_64_XEN to determine PV-only kernels. Note that these CONFIG flags were never upstream, and existed only in Linux kernels forked by Xen ("XenLinux"). By the time Xen guest support was added upstream, it was implemented...

Christoph, I understand this is the better option if HVM is available.. Im not sure how to make use of this kernel in a non-HVM, PV environment. I'm a little disturbed by the fact that there isnt PV support in CentOS 8, I hope it comes later so at least PVH becomes an option. As for using this kernel in a PV only environment, the only route would be attempting an in place upgrade and try to

v1: https://www.redhat.com/archives/libguestfs/2017-April/msg00031.html v2: https://www.redhat.com/archives/libguestfs/2017-April/msg00040.html v2 -> v3: - Fix Xen PV-only kernel detection. Rich.

v1: https://www.redhat.com/archives/libguestfs/2017-April/msg00031.html v2: https://www.redhat.com/archives/libguestfs/2017-April/msg00040.html v3: https://www.redhat.com/archives/libguestfs/2017-April/msg00051.html v3 -> v4: - Properly fix Xen PV-only kernel detection, and test it. Rich.