From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752135AbdBCCbX (ORCPT ); Thu, 2 Feb 2017 21:31:23 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:36218 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751771AbdBCCbW (ORCPT ); Thu, 2 Feb 2017 21:31:22 -0500 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org DBA166070D Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=shankerd@codeaurora.org From: Shanker Donthineni To: Marc Zyngier , Christoffer Dall Cc: linux-kernel , linux-arm-kernel , Eric Auger , Paolo Bonzini , Vikram Sethi , Shanker Donthineni Subject: [PATCH] KVM: arm/arm64: vgic: Stop injecting the MSI occurrence twice Date: Thu, 2 Feb 2017 20:30:03 -0600 Message-Id: <1486089003-413-1-git-send-email-shankerd@codeaurora.org> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The IRQFD framework calls the architecture dependent function twice if the corresponding GSI type is edge triggered. For ARM, the function kvm_set_msi() is getting called twice whenever the IRQFD receives the event signal. The rest of the code path is trying to inject the MSI without any validation checks. No need to call the function vgic_its_inject_msi() second time to avoid an unnecessary overhead in IRQ queue logic. It also avoids the possibility of VM seeing the MSI twice. Simple fix, return -1 if the argument 'level' value is zero. Signed-off-by: Shanker Donthineni --- virt/kvm/arm/vgic/vgic-irqfd.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/virt/kvm/arm/vgic/vgic-irqfd.c b/virt/kvm/arm/vgic/vgic-irqfd.c index d918dcf..f138ed2 100644 --- a/virt/kvm/arm/vgic/vgic-irqfd.c +++ b/virt/kvm/arm/vgic/vgic-irqfd.c @@ -99,6 +99,9 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, if (!vgic_has_its(kvm)) return -ENODEV; + if (!level) + return -1; + return vgic_its_inject_msi(kvm, &msi); } -- Qualcomm Datacenter Technologies, Inc. on behalf of the Qualcomm Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.