Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965362AbbEMVDn (ORCPT ); Wed, 13 May 2015 17:03:43 -0400 Received: from www.linutronix.de ([62.245.132.108]:34743 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934166AbbEMVDl (ORCPT ); Wed, 13 May 2015 17:03:41 -0400 Date: Wed, 13 May 2015 23:03:44 +0200 (CEST) From: Thomas Gleixner To: Jiang Liu cc: Feng Wu , mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org Subject: Re: [v4 1/3] genirq: Introduce irq_set_vcpu_affinity() to target an interrupt to a VCPU In-Reply-To: <555306C9.6040405@linux.intel.com> Message-ID: References: <1430377608-10490-1-git-send-email-feng.wu@intel.com> <1430377608-10490-2-git-send-email-feng.wu@intel.com> <555306C9.6040405@linux.intel.com> User-Agent: Alpine 2.11 (DEB 23 2013-08-11) 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 Content-Length: 1505 Lines: 34 On Wed, 13 May 2015, Jiang Liu wrote: > On 2015/4/30 15:06, Feng Wu wrote: > > With Posted-Interrupts support in Intel CPU and IOMMU, an external > > interrupt from assigned-devices could be directly delivered to a > > virtual CPU in a virtual machine. Instead of hacking KVM and Intel > > IOMMU drivers, we propose a platform independent interface to target > > an interrupt to a specific virtual CPU in a virtual machine, or set > > virtual CPU affinity for an interrupt. > > > > By adopting this new interface and the hierarchy irqdomain, we could > > easily support posted-interrupts on Intel platforms, and also provide > > flexible enough interfaces for other platforms to support similar > > features. > > > > Here is the usage scenario for this interface: > > Guest update MSI/MSI-X interrupt configuration > > -->QEMU and KVM handle this > > -->KVM call this interface (passing posted interrupts descriptor > > and guest vector) > > -->irq core will transfer the control to IOMMU > > -->IOMMU will do the real work of updating IRTE (IRTE has new > > format for VT-d Posted-Interrupts) > > Hi Thomas, > Any comments or suggestions about this abstraction interface? It's on my review list... -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/