Re: [PATCH v4 0/3] qspinlock: Introducing a 4-byte queue spinlock

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To: Waiman Long <waiman.long@xxxxxx>
Subject: Re: [PATCH v4 0/3] qspinlock: Introducing a 4-byte queue spinlock
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Tue, 18 Feb 2014 22:28:27 +0100
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, linux-arch@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Steven Rostedt <rostedt@xxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Michel Lespinasse <walken@xxxxxxxxxx>, Andi Kleen <andi@xxxxxxxxxxxxxx>, Rik van Riel <riel@xxxxxxxxxx>, "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>, George Spelvin <linux@xxxxxxxxxxx>, Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>, Daniel J Blueman <daniel@xxxxxxxxxxxxx>, Alexander Fyodorov <halcy@xxxxxxxxx>, Aswin Chandramouleeswaran <aswin@xxxxxx>, Scott J Norton <scott.norton@xxxxxx>, Thavatchai Makphaibulchoke <thavatchai.makpahibulchoke@xxxxxx>
In-reply-to: <5303B4C4.2040907@hp.com>
List-id: <linux-arch.vger.kernel.org>
User-agent: Mutt/1.5.21 (2012-12-30)

On Tue, Feb 18, 2014 at 02:30:12PM -0500, Waiman Long wrote:
> I will start looking at how to make it work with paravirt. Hopefully, it
> won't take too long.

The cheap way out is to simply switch to the test-and-set spinlock on
whatever X86_FEATURE_ indicates a guest I suppose.
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References:
- [PATCH v4 0/3] qspinlock: Introducing a 4-byte queue spinlock
  - From: Waiman Long
- Re: [PATCH v4 0/3] qspinlock: Introducing a 4-byte queue spinlock
  - From: H. Peter Anvin
- Re: [PATCH v4 0/3] qspinlock: Introducing a 4-byte queue spinlock
  - From: Peter Zijlstra
- Re: [PATCH v4 0/3] qspinlock: Introducing a 4-byte queue spinlock
  - From: Waiman Long

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