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

To: Andrew Lutomirski <luto@xxxxxxx>
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: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Fri, 29 Jul 2011 08:31:35 -0700
Cc: Keir Fraser <keir.xen@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
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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.

    J


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