RE: [Xen-devel] PV guest + shadow paging

["Ian Pratt" <Ian.Pratt@xxxxxxxxxxxx>]

> In a PV guest, shadow paging is used for logging dirty pages during
> live
> migration. For a HVM guest, it's enabled all the time due to full
> virtualization.
> 
> Does the current version of Xen support running a PV guest with shadow
> paging enabled all the time ? If so, will it work if I just put
> "shadow_memory = 8"
> in the cfg file ?

During live relocation of PV guests, shadow mode is used to log dirty page 
accesses, but its not used to do address translation. It is possible to get PV 
guests running in 'auto translate mode', but I'm not sure it can be done via 
the guest config file. Since this mode is typically only used by various 
research projects its possible that support has rotted. Look for any references 
to auto translate mode in the domain builder for clues as to how to enable it.

Ian


 

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