Re: [Xen-devel] Nested events in 64bit mini-OS

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Sun, 2012-11-18 at 17:43 +0000, Samuel Thibault wrote:
> > Correct me if I am wrong, I think hypercall_page is mapped at runtime to
> > guest OS by Xen. It's not actually part of the critical section of guest OS,
> > at least not at compile time.
> 
> Sure. I meant it'd mean a second fixup table, but who knows what code is
> there, it could be tampering with the stack.

In practice it isn't. Since the hypercall page is a blackbox to the
guest I don't think it is really reasonable for it to be messing with
the stack without makings its own arrangements for correctness of
nesting etc.

Ian.



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