From patchwork Mon Nov 10 06:26:51 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Wu, Feng" X-Patchwork-Id: 5264141 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 5E2A9C11AC for ; Mon, 10 Nov 2014 06:38:46 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 983CB2016C for ; Mon, 10 Nov 2014 06:38:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C7D812015D for ; Mon, 10 Nov 2014 06:38:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750928AbaKJGi2 (ORCPT ); Mon, 10 Nov 2014 01:38:28 -0500 Received: from mga11.intel.com ([192.55.52.93]:54509 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751918AbaKJGgj (ORCPT ); Mon, 10 Nov 2014 01:36:39 -0500 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP; 09 Nov 2014 22:36:38 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.07,351,1413270000"; d="scan'208";a="629364157" Received: from unknown (HELO wf-hsw-desktop.bj.intel.com) ([10.238.154.53]) by fmsmga002.fm.intel.com with ESMTP; 09 Nov 2014 22:36:16 -0800 From: Feng Wu To: gleb@kernel.org, pbonzini@redhat.com, dwmw2@infradead.org, joro@8bytes.org, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org Cc: kvm@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Feng Wu Subject: [PATCH 12/13] iommu/vt-d: No need to migrating irq for VT-d Posted-Interrtups Date: Mon, 10 Nov 2014 14:26:51 +0800 Message-Id: <1415600812-27773-13-git-send-email-feng.wu@intel.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1415600812-27773-1-git-send-email-feng.wu@intel.com> References: <1415600812-27773-1-git-send-email-feng.wu@intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP We don't need to migrate the irqs for VT-d Posted-Interrtups here. When 'pst' is set in IRTE, the associated irq will be posted to guests instead of interrupt remapping. The destination of the interrupt is set in Posted-Interrupts Descriptor, and the migration happens during VCPU scheduling. Signed-off-by: Feng Wu --- drivers/iommu/intel_irq_remapping.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c index 87c02fe..249e2b1 100644 --- a/drivers/iommu/intel_irq_remapping.c +++ b/drivers/iommu/intel_irq_remapping.c @@ -1038,6 +1038,13 @@ intel_ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask, if (get_irte(irq, &irte)) return -EBUSY; + /* + * If the interrupt is for posting, it is used by guests, + * we cannot change IRTE here. + */ + if (irte.irq_post_low.pst == 1) + return 0; + err = assign_irq_vector(irq, cfg, mask); if (err) return err;