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Xen HVM can run any OS, IIRC.
If your provider supports it, Xen-PV servers can run their own kernel with pygrub/pvgrub/something ending in grub
There are 2 types, -pv and -HVM
pv from paravirtualization, while runs own kernel (can without too) is a special kernel aware is running in a VM and has special relations with the host kernel.
HVM can run unmodified OSes, including windows.
Now there is a project to take the advantages of PV to hvm, promissing so far.
If pv, and I only need Linux, is it safe to assume it will behave like KVM? Meaning it's not hackish as OpenVZ and I expect things to run like a dedicated?
It depends, pv does not support booting from iso, for example, but supports debootstrap.
You can expect most things to work as in a kvm, though, you have "real" emulated nics, can compile own kernel, if the original one lacks support for something, etc. Most distros have xen kernels.
Yes.
Thanks for the answers!
XenHVM is good for Windows OS.
I am using XenHVM and never face a any issue(Easy to upgrade/downgrade and easy to manage/debug,etc)