Re: [Xen-devel] [RFC] x86: PV SMAP for 64-bit guests

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 31.01.14 at 17:56, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote:
>> Hence before going further with this approach (for now I only got
>> it to the point that an un-patched Linux is unaffected, i.e. I didn't
>> code up the Linux side yet) I would be interested to hear people's
>> opinions on whether the performance cost is worth it, or whether
>> instead we should consider PVH the one and only route towards
>> gaining that extra level of security.
> 
> Would we get this feature for 'free' if we do PVH? Meaning there
> is not much to modify in the Linux kernel to make it work in PVH mode?

That's my expectation, yes.

Jan


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