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From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Roland McGrath <roland@redhat.com>
Cc: Andi Kleen <ak@suse.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	virtualization@lists.osdl.org,
	lkml <linux-kernel@vger.kernel.org>,
	Ian Pratt <ian.pratt@xensource.com>,
	Christian Limpach <Christian.Limpach@cl.cam.ac.uk>,
	Chris Wright <chrisw@sous-sol.org>,
	Zachary Amsden <zach@vmware.com>,
	Ulrich Drepper <drepper@redhat.com>
Subject: Re: [PATCH 03/25] xen: Add nosegneg capability to the vsyscall page notes
Date: Mon, 23 Apr 2007 23:19:05 -0700	[thread overview]
Message-ID: <462DA159.2030600@goop.org> (raw)
In-Reply-To: <20070424042653.37F421801A4@magilla.sf.frob.com>

Roland McGrath wrote:
>> I have to admit I still don't really understand all this.  Is it
>> documented somewhere?
>>     
>
> I have explained it in public more than once, but I don't know off hand
> anywhere that was helpfully recorded.
>   

Thanks very much.  I'd been poking about, but the closest I came to an
actual description was various patches fixing bugs, so it was a little
incomplete.

> For example, a Xen-enabled kernel can use a single vDSO image (or a single
> pair of int80/sysenter images), containing the "nosegneg" hwcap note.  When
> there is no need for it (native or hvm or 64-bit hv or whatever), it just
> clears the mask word.  If you actually do this, you'll want to modify the
> NOTE_KERNELCAP_BEGIN macro to define a global label you can use with VDSO_SYM.
>   

Thanks for the pointer.  I'd been getting a bit of heat for enabling the
nonegseg flag unconditionally.  If I can make Xen-specific then that
will be one less source of complaints.

    J

  reply	other threads:[~2007-04-24  6:19 UTC|newest]

Thread overview: 67+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-04-23 21:56 [PATCH 00/25] xen: Xen implementation for paravirt_ops Jeremy Fitzhardinge
2007-04-23 21:56 ` [PATCH 01/25] xen: Add apply_to_page_range() which applies a function to a pte range Jeremy Fitzhardinge
2007-04-23 21:56 ` [PATCH 02/25] xen: Allocate and free vmalloc areas Jeremy Fitzhardinge
2007-04-23 21:56 ` [PATCH 03/25] xen: Add nosegneg capability to the vsyscall page notes Jeremy Fitzhardinge
2007-04-23 23:29   ` Roland McGrath
2007-04-24  1:24     ` Jeremy Fitzhardinge
2007-04-24  4:26       ` Roland McGrath
2007-04-24  6:19         ` Jeremy Fitzhardinge [this message]
2007-04-23 21:56 ` [PATCH 04/25] xen: Add XEN config options Jeremy Fitzhardinge
2007-04-23 23:00   ` Andi Kleen
2007-04-23 23:11     ` Jeremy Fitzhardinge
2007-04-24 19:45       ` Andi Kleen
2007-04-23 21:56 ` [PATCH 05/25] xen: Add Xen interface header files Jeremy Fitzhardinge
2007-04-23 21:56 ` [PATCH 06/25] xen: Core Xen implementation Jeremy Fitzhardinge
2007-04-24 21:25   ` Andi Kleen
2007-04-25  2:02     ` Jeremy Fitzhardinge
2007-04-25  9:12     ` Andi Kleen
2007-04-25 19:41       ` Jeremy Fitzhardinge
2007-04-25 19:43         ` Andi Kleen
2007-04-25 19:44           ` [PATCH 06/25] xen: Core Xen implementation II Andi Kleen
2007-04-25 20:03           ` [PATCH 06/25] xen: Core Xen implementation Jeremy Fitzhardinge
2007-04-25 20:17             ` Andi Kleen
2007-04-25 20:20               ` Jeremy Fitzhardinge
2007-04-27  7:08     ` Jeremy Fitzhardinge
2007-04-27  7:31       ` Keir Fraser
2007-04-23 21:56 ` [PATCH 07/25] xen: Complete pagetable pinning for Xen Jeremy Fitzhardinge
2007-04-23 21:56 ` [PATCH 08/25] xen: xen: fix multicall batching Jeremy Fitzhardinge
2007-04-23 21:56 ` [PATCH 09/25] xen: Account for time stolen by Xen Jeremy Fitzhardinge
2007-04-25  9:15   ` Andi Kleen
2007-04-25 18:13     ` Jeremy Fitzhardinge
2007-04-25 18:15       ` Andi Kleen
2007-04-25 18:40         ` Jeremy Fitzhardinge
2007-04-23 21:56 ` [PATCH 10/25] xen: Implement xen_sched_clock Jeremy Fitzhardinge
2007-04-23 21:56 ` [PATCH 11/25] xen: Xen SMP guest support Jeremy Fitzhardinge
2007-04-25  9:24   ` Andi Kleen
2007-04-25 18:45     ` Jeremy Fitzhardinge
2007-04-27  6:46     ` Jeremy Fitzhardinge
2007-04-27  9:10       ` Andi Kleen
2007-04-23 21:56 ` [PATCH 12/25] xen: Add support for preemption Jeremy Fitzhardinge
2007-04-23 21:56 ` [PATCH 13/25] xen: xen: lazy-mmu operations Jeremy Fitzhardinge
2007-04-23 21:56 ` [PATCH 14/25] xen: xen: deal with negative stolen time Jeremy Fitzhardinge
2007-04-23 21:56 ` [PATCH 15/25] xen: xen time fixups Jeremy Fitzhardinge
2007-04-23 21:56 ` [PATCH 16/25] xen: Use the hvc console infrastructure for Xen console Jeremy Fitzhardinge
2007-04-24  1:21   ` Olof Johansson
2007-04-24 20:01     ` Jeremy Fitzhardinge
2007-04-23 21:56 ` [PATCH 17/25] xen: Add early printk support via hvc console Jeremy Fitzhardinge
2007-04-23 21:56 ` [PATCH 18/25] xen: Add Xen grant table support Jeremy Fitzhardinge
2007-04-23 21:56 ` [PATCH 19/25] xen: Add the Xenbus sysfs and virtual device hotplug driver Jeremy Fitzhardinge
2007-04-23 21:56 ` [PATCH 20/25] xen: Add Xen virtual block device driver Jeremy Fitzhardinge
2007-04-23 21:56 ` [PATCH 21/25] xen: Add the Xen virtual network " Jeremy Fitzhardinge
2007-04-23 21:57 ` [PATCH 22/25] xen: xen-netfront: use skb.cb for storing private data Jeremy Fitzhardinge
2007-04-24  1:45   ` Herbert Xu
2007-04-24  4:34     ` Jeremy Fitzhardinge
2007-04-24  5:57       ` Herbert Xu
2007-04-27 22:19         ` Jeremy Fitzhardinge
2007-04-27 22:37           ` Herbert Xu
2007-04-27 23:27             ` Jeremy Fitzhardinge
2007-04-28  6:28               ` Herbert Xu
2007-04-29  7:43                 ` Jeremy Fitzhardinge
2007-04-29  8:05                   ` Herbert Xu
2007-04-23 21:57 ` [PATCH 23/25] xen: Lockdep fixes for xen-netfront Jeremy Fitzhardinge
2007-04-24  3:22   ` Herbert Xu
2007-04-24  4:36     ` Jeremy Fitzhardinge
2007-04-23 21:57 ` [PATCH 24/25] xen: xen: diddle netfront Jeremy Fitzhardinge
2007-04-23 21:57 ` [PATCH 25/25] xen: Xen machine operations Jeremy Fitzhardinge
2007-04-23 22:50 ` [PATCH 00/25] xen: Xen implementation for paravirt_ops Andi Kleen
2007-04-23 23:09   ` Jeremy Fitzhardinge

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