From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56751) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YJrQf-0007yi-S8 for qemu-devel@nongnu.org; Fri, 06 Feb 2015 17:31:14 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YJrQc-0006I0-ML for qemu-devel@nongnu.org; Fri, 06 Feb 2015 17:31:13 -0500 Received: from mx1.redhat.com ([209.132.183.28]:37892) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YJrQc-0006Hq-FS for qemu-devel@nongnu.org; Fri, 06 Feb 2015 17:31:10 -0500 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id t16MV83Z028598 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL) for ; Fri, 6 Feb 2015 17:31:09 -0500 From: Alex Williamson Date: Fri, 06 Feb 2015 15:31:07 -0700 Message-ID: <20150206223017.31922.43167.stgit@gimli.home> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Subject: [Qemu-devel] [PATCH] vfio: Use vfio type1 v2 IOMMU interface List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: alex.williamson@redhat.com The difference between v1 and v2 is fairly subtle, simply more deterministic behavior for unmaps. The v1 interface allows the user to attempt to unmap sub-regions of previous mappings, returning success with zero size if unable to comply. This was a reflection of the underlying IOMMU API. The v2 interface requires that the user may only unmap fully contained mappings, ie. an unmap cannot intersect or bisect a previous mapping, but may cover multiple mappings. QEMU never made use of the sub-region v1 support anyway, so we can support either v1 or v2. We'll favor v2 since it's newer. Signed-off-by: Alex Williamson --- hw/vfio/common.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/hw/vfio/common.c b/hw/vfio/common.c index b230ef1..c5d1551 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -662,7 +662,10 @@ static int vfio_connect_container(VFIOGroup *group, AddressSpace *as) container = g_malloc0(sizeof(*container)); container->space = space; container->fd = fd; - if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU)) { + if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU) || + ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1v2_IOMMU)) { + bool v2 = !!ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1v2_IOMMU); + ret = ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &fd); if (ret) { error_report("vfio: failed to set group container: %m"); @@ -670,7 +673,8 @@ static int vfio_connect_container(VFIOGroup *group, AddressSpace *as) goto free_container_exit; } - ret = ioctl(fd, VFIO_SET_IOMMU, VFIO_TYPE1_IOMMU); + ret = ioctl(fd, VFIO_SET_IOMMU, + v2 ? VFIO_TYPE1v2_IOMMU : VFIO_TYPE1_IOMMU); if (ret) { error_report("vfio: failed to set iommu for container: %m"); ret = -errno;