Re: [Xen-devel] [for-4.7] x86/emulate: synchronize LOCKed instruction emulation

[Juergen Gross <jgross@xxxxxxxx>]

On 14/04/16 07:56, Razvan Cojocaru wrote:
> This indeed doesn't guard against LOCKed instructions being run in
> parallel with and without emulation, however that is a case that should
> almost never occur - at least not with introspection, where currently
> all emulation happens as a result of EPT faults - so either all
> instructions hitting a restricted page are emulated, or all ar run
> directly. As long as all emulation can safely run in parallel and all
> parallel non-emulation is also safe, it should be alright. But, yes,
> this patch doesn't cover the case you're mentioning.

What about grant pages? There could be parallel accesses from different
domains, one being introspected, the other not.


Juergen

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