Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751781AbeAPScc (ORCPT + 1 other); Tue, 16 Jan 2018 13:32:32 -0500 Received: from Galois.linutronix.de ([146.0.238.70]:43926 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751060AbeAPSca (ORCPT ); Tue, 16 Jan 2018 13:32:30 -0500 Date: Tue, 16 Jan 2018 19:31:58 +0100 (CET) From: Thomas Gleixner To: Vitaly Kuznetsov cc: kvm@vger.kernel.org, x86@kernel.org, Paolo Bonzini , =?ISO-8859-2?Q?Radim_Kr=E8m=E1=F8?= , Ingo Molnar , "H. Peter Anvin" , "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , "Michael Kelley (EOSG)" , Andy Lutomirski , Mohammed Gamal , Cathy Avery , Roman Kagan , linux-kernel@vger.kernel.org, devel@linuxdriverproject.org Subject: Re: [PATCH v3 4/7] x86/hyper-v: redirect reenlightment notifications on CPU offlining In-Reply-To: <20180116182700.1042-5-vkuznets@redhat.com> Message-ID: References: <20180116182700.1042-1-vkuznets@redhat.com> <20180116182700.1042-5-vkuznets@redhat.com> User-Agent: Alpine 2.20 (DEB 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: On Tue, 16 Jan 2018, Vitaly Kuznetsov wrote: > It is very unlikely for CPUs to get offlined when we run on Hyper-V as > we have a protection in vmbus module which prevents it when we have any > VMBus devices assigned. This, however, may change in future if an option > to reassign an already active channel will be added. It is also possible > to run without any Hyper-V devices of have a CPU with no assigned channels. > > Reassign reenlightenment notifications to some other active CPU when > the CPU which is assigned to get them goes offline. > > Signed-off-by: Vitaly Kuznetsov Reviewed-by: Thomas Gleixner