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

[Boris Ostrovsky]

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


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/