![]() ![]() I do not use MAC, nor OS/2, only Windows host ans Linux host (both host are on different physical hardware). That is what i had seen, i must do more tests with other paravirtualization values, just in case any one works better on the Linux host. I had also tried enabling/disabling 2D & 3D (also PAE/NX) because i want the same guest (virtual HDDs copied from one host to the other) be stable on two different hosts also i want to be able to copy virtual HDDs from one host to another host after i make any update (before doing a cold boot, merge inmutable disk with its parent to make changes permanent and not get lost, aka using CloneVDI) i do not use snapshots, only inmutable disks. With paravirtualization on "Heredada" it does boot on Linux host (but it is not allways stable to let you use it).With paravirtualization on "default" it does not even boot on Linux host, but boots well on Windows Host.All are reverted back on each cold boot.so there must be a race contition somewhere, sinve with inmutable disks it does not allways do the same.Īh, by the way, the Windows guest has no Internet access to be sure no internet connection can make things work different among cold boots. remember all disks are inmutable.īut as soon as i set paravirtualization to "Heredada" (it is in Spanish) it boots and reach desktop, but sometimes (remember all disks are inmutable) it reboots, while other times i can use it (very, very slow). If i try same virtual machine on a Linux host with paravirtualization "default" the Windows 10 guest does not boot, it boots till dots move in a circle, then after a while it freezes. On windows 10 host, the guest runs normally (maybe a bit slow) but it boots and desktop is shown. Not to mention, all virtual disks i use are inmutable (to ensure identical tests). I had tested with a Windows 10 guest, running on a Windows 10 host and on a Linux host (or at least i had tried). If you migrating/moving VMs from Linux to Windows, I recommend to have default option, which makes automatic selection of best virtualization interface. So if you have upgraded VirtualBox to version 5 in Linux, just select kvm or default, start VM and check if it works correctly. These options are explained in detail under Section 10.4, “ Paravirtualization providers”. and hyperv - recommended for Windows guests.The minimal provider is mandatory for Mac OS X guests,.The legacy option is chosen for VMs which were created with older VirtualBox versions and will pick a paravirtualization interface while starting the VM with VirtualBox 5.0 and newer.This is the default option chosen while creating new VMs. The option default, will pick an appropriate interface depending on the guest OS type while starting the VM.Specifying none explicitly turns off exposing any paravirtualization interface. ![]() This setting specifies which paravirtualization interface to provide to the guest operating system. paravirtprovider none|default|legacy|minimal|hyperv|kvm: Let's be more precise, because I had 4.3 migrated VMs, and those are "legacy", also I was interested in what setting to use, if I copy VM from Linux to Windows or vice versa: ![]() Legacy: The legacy option is chosen for VMs which were created with older VirtualBox versions and will pick a paravirtualization interface while starting the VM with VirtualBox 5.0 and newer. None: Specifying none explicitly turns off exposing any paravirtualization interface.ĭefault: The option default, will pick an appropriate interface depending on the guest OS type while starting the VM. The other options in the drop down do the following, as explained in the vboxmanage docs: This provider is recommended for Windows guests. VirtualBox's implementation currently supports paravirtualized clocks, APIC frequency reporting, guest debugging, guest crash reporting and relaxed timer checks. Hyper-V: Presents a Microsoft Hyper-V hypervisor interface which is recognized by Windows 7 and newer operating systems. This provider is recommended for Linux guests. VirtualBox's implementation currently supports paravirtualized clocks and SMP spinlocks. KVM: Presents a Linux KVM hypervisor interface which is recognized by Linux kernels starting with version 2.6.25. This provider is mandatory for running any Mac OS Additionally, reports the TSC and APIC frequency to the guest operating system. Minimal: Announces the presence of a virtualized environment. The VirtualBox Manual, in the section titled Paravirtualization providers explains very clearly when each should be used (emphasis added):
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