From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Fedin Subject: RE: [PATCH] KVM: arm/arm64: BUG: Fix losing level-sensitive interrupts Date: Wed, 26 Aug 2015 16:11:33 +0300 Message-ID: <011d01d0e000$bbbd94d0$3338be70$@samsung.com> References: <1440571563-7004-1-git-send-email-p.fedin@samsung.com> <20150826092721.43e8cbfd@arm.com> <00d701d0dfee$2f464810$8dd2d830$@samsung.com> <55DD9F5B.4080602@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, 'Christoffer Dall' , =?ISO-8859-1?Q?'Alex_Benn=E9e'?= To: 'Marc Zyngier' Return-path: Received: from mailout4.w1.samsung.com ([210.118.77.14]:34116 "EHLO mailout4.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751791AbbHZNLh (ORCPT ); Wed, 26 Aug 2015 09:11:37 -0400 Received: from eucpsbgm2.samsung.com (unknown [203.254.199.245]) by mailout4.w1.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTP id <0NTO00KU2XZB85A0@mailout4.w1.samsung.com> for kvm@vger.kernel.org; Wed, 26 Aug 2015 14:11:35 +0100 (BST) In-reply-to: <55DD9F5B.4080602@arm.com> Content-language: ru Sender: kvm-owner@vger.kernel.org List-ID: Hello! > Sorry, but I don't really want to introduce another bug > in the VGIC code (we have too many already). And what you're suggesting > is to actually introduce a bug. Another, alternate idea... So far, we have a situation when empty LR, containing only LR_INT_EOI bit, is queued. Can we say that this is wrong? If you agree, may be do something else instead? May be we should cancel such "ghost" interrupts early, avoiding immediate and completely unnecessary maintenance interrupts upon guest entry? Kind regards, Pavel Fedin Expert Engineer Samsung Electronics Research center Russia