Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752153AbaKJGi3 (ORCPT ); Mon, 10 Nov 2014 01:38:29 -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 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.07,351,1413270000"; d="scan'208";a="629364157" 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: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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; -- 1.7.1 -- 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/