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Re: [Xen-devel] [semi-urgent Xen CS question] Re: git commit 9fd67b4ed07

To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: Re: [Xen-devel] [semi-urgent Xen CS question] Re: git commit 9fd67b4ed0714ab718f1f9bd14c344af336a6df7 (x86-64: Give vvars their own page) breaks Xen PV guests (64-bit).
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Sun, 31 Jul 2011 14:56:57 -0400
Cc: Andrew Lutomirski <luto@xxxxxxx>, Keir Fraser <keir.xen@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
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On Fri, Jul 29, 2011 at 08:31:35AM -0700, Jeremy Fitzhardinge wrote:
> On 07/29/2011 05:51 AM, Andrew Lutomirski wrote:
> > VCGF_in_syscall: gettimeofday() (the syscall version) takes 593 ns.
> > Without VCGF_in_syscall, it's 712 ns.
> >
> > I'd argue for using my original approach of adding a user_64bit_mode
> > function -- I think it's a legitimate cleanup and Xen, for better or
> > worse, really does have two long mode CPL 3 selectors.  If we removed
> > selector 6 from the GDT, that would be a different story, but that
> > would probably be a more intrusive change.
> Sigh.  Yeah, let's see what happens.

So.. roll with Andrew's patches? I think Andrew is just waiting for the word
from you whether to repost the patches so that x86 maintainers can take a look
at them..

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