Re: [Xen-devel] [PATCH] x86-64: clear DF for kernel when forwarding syscall

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 24/6/07 11:58, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

> I had sent a mail to that effect (at least I think I had) - on x86-64, this
> may
> be the preferred way (at least for the !XEN_COMPAT case), but the i386
> kernel has to remain runnable on 32-bit Xen, and doing gp-fault-recoverable
> MSR accesses doesn't buy us anything in terms of not needing specialized
> Xen code (i.e. if we need special Xen code, we can equally well do
> hypercalls).
> For that reason, at this point I implemented both access methods, but haven't
> got around yet to make the kernel side use them.

The only problem is it probably requires an entirely new top-level hypercall
because it's not going to fit into the constraints of the existing
callback_op(). 

 -- Keir



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