From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexander Graf Subject: Re: [PATCH v2 0/6] Implement split core for POWER8 Date: Fri, 23 May 2014 11:53:17 +0200 Message-ID: <537F1A8D.9000704@suse.de> References: <1400832930-17050-1-git-send-email-mikey@neuling.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Paul Mackerras , linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, Michael Ellerman To: Michael Neuling , Benjamin Herrenschmidt Return-path: In-Reply-To: <1400832930-17050-1-git-send-email-mikey@neuling.org> Sender: kvm-ppc-owner@vger.kernel.org List-Id: kvm.vger.kernel.org On 23.05.14 10:15, Michael Neuling wrote: > This patch series implements split core mode on POWER8. This enables up to 4 > subcores per core which can each independently run guests (per guest SPRs like > SDR1, LPIDR etc are replicated per subcore). Lots more documentation on this > feature in the code and commit messages. > > Most of this code is in the powernv platform but there's a couple of KVM > specific patches too. > > Patch series authored by mpe and me with a few bug fixes from others. > > v2: > There are some minor updates based on comments and I've added the Acks by > Paulus and Alex for the KVM code. I don't see changelogs inside the individual patches. Please make sure to always mention what changed from one version to the next in a particular patch, so that I have the chance to check whether that change was good :). Also, is there any performance penalty associated with split core mode? If not, could we just always default to split-by-4 on POWER8 bare metal? Alex