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

[Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>]

At 07:34 +0100 on 30 Jul (1185780899), Ian Campbell wrote:
> Adding
>         features = "auto_translated_physmap|writable_page_tables"
> to the config file should add those features to the set passed to the
> guest. I can't remember which set you would need to enable shadow mode,
> you may have to dig round in the builder and/or hypervisor to figure it
> out.

IIRC, "auto_translated_physmap" turns on both shadow mode and
auto-translation.  You could enable just the shadowing without the
auto-translation by changing tools/libxc/xc_dom_x86.c to remove
XEN_DOMCTL_SHADOW_ENABLE_TRANSLATE from the "mode" argument to
xc_shadow_control().

> However I'm not sure shadow mode (other than log-dirty) isn't broken for
> PV guests. It's been a long time since I tried it but it was broken back
> when the paravirt_ops tree was still trying to use it.

Auto-translate was (briefly) fixed at that time too, but I'm quite sure
it doesn't work in the current tree.  Some people had this kind of thing
going for academic research projects; maybe one of them can comment.

Cheers,

Tim.

-- 
Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>, XenSource UK Limited
Registered office c/o EC2Y 5EB, UK; company number 05334508

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