From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934186AbeCEKaB (ORCPT ); Mon, 5 Mar 2018 05:30:01 -0500 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:34712 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S934137AbeCEK3v (ORCPT ); Mon, 5 Mar 2018 05:29:51 -0500 From: Vitaly Kuznetsov To: Paolo Bonzini , Radim =?utf-8?B?S3LEjW3DocWZ?= Cc: linux-kernel@vger.kernel.org, x86@kernel.org, Peter Xu , kvm@vger.kernel.org Subject: Re: [PATCH] KVM: lapic: stop advertising DIRECTED_EOI when in-kernel IOAPIC is in use References: <20180209130133.28387-1-vkuznets@redhat.com> Date: Mon, 05 Mar 2018 11:29:46 +0100 In-Reply-To: <20180209130133.28387-1-vkuznets@redhat.com> (Vitaly Kuznetsov's message of "Fri, 9 Feb 2018 14:01:33 +0100") Message-ID: <87r2oyzug5.fsf@vitty.brq.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Vitaly Kuznetsov writes: > Devices which use level-triggered interrupts under Windows 2016 with > Hyper-V role enabled don't work: Windows disables EOI broadcast in SPIV > unconditionally. Our in-kernel IOAPIC implementation emulates an old IOAPIC > version which has no EOI register so EOI never happens. > > The issue was discovered and discussed a while ago: > https://www.spinics.net/lists/kvm/msg148098.html > Radim, Paolo, do we have a consensus here? (I wouldn't mind re-writing commit message in case you think we shouldn't blame Windows, I just want to have the annoying bug fixed :-) -- Vitaly