From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from Galois.linutronix.de (Galois.linutronix.de [IPv6:2001:470:1f0b:db:abcd:42:0:1]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 5B70B1A02E4 for ; Thu, 26 Feb 2015 03:36:58 +1100 (AEDT) Date: Wed, 25 Feb 2015 17:36:49 +0100 From: Sebastian Andrzej Siewior To: Scott Wood Subject: Re: [PATCH 0/2] powerpc/kvm: Enable running guests on RT Linux Message-ID: <20150225163649.GD6823@linutronix.de> References: <1424251955-308-1-git-send-email-bogdan.purcareata@freescale.com> <54E73A6C.9080500@suse.de> <54E740E7.5090806@redhat.com> <54E74A8C.30802@linutronix.de> <1424734051.4698.17.camel@freescale.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 In-Reply-To: <1424734051.4698.17.camel@freescale.com> Cc: linux-rt-users@vger.kernel.org, Alexander Graf , linux-kernel@vger.kernel.org, Bogdan Purcareata , mihai.caraman@freescale.com, Paolo Bonzini , Thomas Gleixner , linuxppc-dev@lists.ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , * Scott Wood | 2015-02-23 17:27:31 [-0600]: >This isn't a host PIC driver. It's guest PIC emulation, some of which >is indeed not suitable for a rawlock (in particular, openpic_update_irq >which loops on the number of vcpus, with a loop body that calls >IRQ_check() which loops over all pending IRQs). The vcpu limits are a >temporary bandaid to avoid the worst latencies, but I'm still skeptical >about this being upstream material. Okay. >-Scott Sebastian