From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vitaly Kuznetsov Subject: Re: [PATCH] KVM: lapic: stop advertising DIRECTED_EOI when in-kernel IOAPIC is in use Date: Mon, 05 Mar 2018 11:29:46 +0100 Message-ID: <87r2oyzug5.fsf@vitty.brq.redhat.com> References: <20180209130133.28387-1-vkuznets@redhat.com> Mime-Version: 1.0 Content-Type: text/plain Cc: linux-kernel@vger.kernel.org, x86@kernel.org, Peter Xu , kvm@vger.kernel.org To: Paolo Bonzini , Radim =?utf-8?B?S3LEjW3DocWZ?= Return-path: In-Reply-To: <20180209130133.28387-1-vkuznets@redhat.com> (Vitaly Kuznetsov's message of "Fri, 9 Feb 2018 14:01:33 +0100") Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.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