From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.lixom.net (lixom.net [66.141.50.11]) by ozlabs.org (Postfix) with ESMTP id 527EA67B5E for ; Mon, 17 Jul 2006 09:09:45 +1000 (EST) Date: Sun, 16 Jul 2006 18:09:15 -0500 To: Luke Browning Subject: Re: [PATCH 0/3] powerpc: Instrument Hypervisor Calls Message-ID: <20060716230915.GA5497@pb15.lixom.net> References: <20060716035353.GA5266@pb15.lixom.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: From: Olof Johansson Cc: Arnd Bergmann , Bryan S Rosenburg , linuxppc-dev@ozlabs.org, Paul Mackerras , Christopher Yeoh , Nathan Lynch List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Sun, Jul 16, 2006 at 08:53:21PM -0200, Luke Browning wrote: > > Just so people don't forget: this can't be done on all processors. For > > example, PPC970 and POWER4 don't implement the PURR SPR. And it doesn't > > make sense to use H_PURR to get the software emulated ones there. Not > > really an issue on POWER4 since they don't do shared processor LPAR, but > > on JS21 I think they might do? > > > Isn't there someway to do a platform specific processor overlay, where you > get PURR if it exists and TB otherwise. Sure, it's what we have cpu feature bits for. It's not a difficult problem to solve, I was just reminding of the lack of SPRN_PURR on some processors that can run hypervisors. -Olof