Re: [Xen-devel] [PATCH 1/3] x86/xen: Avoid fast syscall path for Xen PV guests

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 11/18/2015 03:58 PM, Andy Lutomirski wrote:
> On Wed, Nov 18, 2015 at 12:50 PM, Brian Gerst <brgerst@xxxxxxxxx> wrote:
> > Can you just add !xen_pv_domain() to the opportunistic SYSRET check
> > instead?  Bury the alternatives in that macro, ie.
> > static_cpu_has(X86_FEATURE_XENPV).  That would likely benefit other
> > code as well.
> We could, but that won't help the 64-bit case where we want to keep
> the full asm path.
I don't think I understand what you mean here. Which full asm path?

-boris



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