From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756625AbcI0Utw (ORCPT ); Tue, 27 Sep 2016 16:49:52 -0400 Received: from mx1.redhat.com ([209.132.183.28]:51684 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756440AbcI0Uti (ORCPT ); Tue, 27 Sep 2016 16:49:38 -0400 From: Eric Auger To: eric.auger@redhat.com, eric.auger.pro@gmail.com, christoffer.dall@linaro.org, marc.zyngier@arm.com, robin.murphy@arm.com, alex.williamson@redhat.com, will.deacon@arm.com, joro@8bytes.org, tglx@linutronix.de, jason@lakedaemon.net, linux-arm-kernel@lists.infradead.org Cc: kvm@vger.kernel.org, drjones@redhat.com, linux-kernel@vger.kernel.org, Bharat.Bhushan@freescale.com, pranav.sawargaonkar@gmail.com, p.fedin@samsung.com, iommu@lists.linux-foundation.org, Jean-Philippe.Brucker@arm.com, yehuday@marvell.com, Manish.Jaggi@caviumnetworks.com Subject: [RFC 08/11] vfio/type1: Sets the IOVA window in case MSI IOVA need to be allocated Date: Tue, 27 Sep 2016 20:48:35 +0000 Message-Id: <1475009318-2617-9-git-send-email-eric.auger@redhat.com> In-Reply-To: <1475009318-2617-1-git-send-email-eric.auger@redhat.com> References: <1475009318-2617-1-git-send-email-eric.auger@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Tue, 27 Sep 2016 20:49:38 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In case the IOMMU translates MSI, MSI IOVA will need to be transparently allocated by the kernel in unused GPA space. Let's initialize a DMA domain where some slots will be reserved "unmanaged" slots and rest is left available for IOVA allocation. Signed-off-by: Eric Auger --- drivers/vfio/vfio_iommu_type1.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 2ba1942..ad08fd0 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -36,6 +36,7 @@ #include #include #include +#include #define DRIVER_VERSION "0.2" #define DRIVER_AUTHOR "Alex Williamson " @@ -829,6 +830,11 @@ static int vfio_iommu_type1_attach_group(void *iommu_data, vfio_test_domain_fgsp(domain); + /* sets the IOVA window */ + if (iommu_capable(bus, IOMMU_CAP_TRANSLATE_MSI) && + iommu_get_dma_msi_region_cookie(domain->domain, 0, ULONG_MAX)) + goto out_detach; + /* replay mappings on new domains */ ret = vfio_iommu_replay(iommu, domain); if (ret) -- 1.9.1