WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

[Xen-devel] Re: [PATCH RFC V5 00/11] Paravirtualized ticketlocks

To: "H. Peter Anvin" <hpa@xxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH RFC V5 00/11] Paravirtualized ticketlocks
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Fri, 14 Oct 2011 11:51:46 -0700
Cc: Marcelo Tosatti <mtosatti@xxxxxxxxxx>, Nick Piggin <npiggin@xxxxxxxxx>, KVM <kvm@xxxxxxxxxxxxxxx>, konrad.wilk@xxxxxxxxxx, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Jason Baron <jbaron@xxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, rth@xxxxxxxxxx, Andi Kleen <andi@xxxxxxxxxxxxxx>, Avi Kivity <avi@xxxxxxxxxx>, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
Delivery-date: Fri, 14 Oct 2011 11:52:38 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <4E9881A6.9050106@xxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <cover.1318466916.git.jeremy.fitzhardinge@xxxxxxxxxx> <1318503245.24856.12.camel@twins> <4E971580.6030300@xxxxxxxx> <20111014141701.GA2433@xxxxxxxxxx> <4E986B2B.60803@xxxxxxxx> <20111014183539.GE2433@xxxxxxxxxx> <4E9881A6.9050106@xxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20110930 Thunderbird/7.0.1
On 10/14/2011 11:38 AM, H. Peter Anvin wrote:
> On 10/14/2011 11:35 AM, Jason Baron wrote:
>> A nice featuer of jump labels, is that it allows the various branches
>> (currently we only support 2), to be written in c code (as opposed to asm),
>> which means you can write your code as you normally would and access any
>> parameters as you normally would - hopefully, making the code pretty
>> readable as well.
>>
>> I hope this better clarifies the use-cases for the various mechanisms.
>>
> There is an important subcase which might be handy which would be to
> allow direct patching of call instructions instead of using indirect calls.

Right, that's how the pvops patching is primarily used.

    J

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

<Prev in Thread] Current Thread [Next in Thread>