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

To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
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: Andrew Lutomirski <luto@xxxxxxx>
Date: Sun, 31 Jul 2011 15:14:59 -0400
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Keir Fraser <keir.xen@xxxxxxxxx>
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Actually I'm waiting b/c I'm defending my thesis tomorrow.  I might get v2 out before then, but no guarantee.

On Jul 31, 2011 2:57 PM, "Konrad Rzeszutek Wilk" <konrad.wilk@xxxxxxxxxx> wrote:
> 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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