Am 28.07.10 11:40, schrieb Matthias Pfützner:
[...]
So, in order to minimize that problem, "thin" hypervisors have been
designed,
like Xen. Idea is: Less code, less faults. Compare VMware vs. Xen, and you'll
understand, what I'm talking about... In VMware, there's way more code (as it
is a thick hypervisor), so the probability of an error happeing inside thatr
code is higher then with Xen... Then we have PVM and HVM modes. In PVM mode,
there's even less code from the hyperviso in use, as the guest OS can access
the udnerlying hardware in parts directly, whereas in HVM mode, all access to
the underlying hardware is abstracted by the hypervisor. Again: Higer
probability for errors in software-layers happening...
Matthias
Actually the abstracion of "hardware" for paravirtualized domains is
higher. In HVM mode the guest OS still works on something which looks
and tries to behave like hardware, i.e. an Intel e1000g0 NIC. In PVM
mode the guest OS only uses interfaces of the hypervisor which provide
the functionality of a class of hardware.
but still less code: a reduced set of drivers in the guest OS, which is
or at least can be tailored for the hypervisor.
scnr ;)
Regards, Florian
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