From mboxrd@z Thu Jan 1 00:00:00 1970 From: Baptiste Reynal Subject: [PATCH v4 2/5] vfio: introduce the VFIO_DMA_MAP_FLAG_NOEXEC flag Date: Mon, 2 Mar 2015 17:58:24 +0100 Message-ID: <1425315507-29661-3-git-send-email-b.reynal@virtualopensystems.com> References: <1425315507-29661-1-git-send-email-b.reynal@virtualopensystems.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 71963475DF for ; Mon, 2 Mar 2015 11:53:23 -0500 (EST) Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tCTIY3LMvekl for ; Mon, 2 Mar 2015 11:53:22 -0500 (EST) Received: from mail-we0-f176.google.com (mail-we0-f176.google.com [74.125.82.176]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 888DC475D3 for ; Mon, 2 Mar 2015 11:53:22 -0500 (EST) Received: by wesw55 with SMTP id w55so34583056wes.4 for ; Mon, 02 Mar 2015 08:59:19 -0800 (PST) In-Reply-To: <1425315507-29661-1-git-send-email-b.reynal@virtualopensystems.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu To: iommu@lists.linux-foundation.org, kvmarm@lists.cs.columbia.edu Cc: "open list:VFIO DRIVER" , "open list:ABI/API" , open list , Alex Williamson , tech@virtualopensystems.com List-Id: kvmarm@lists.cs.columbia.edu From: Antonios Motakis We introduce the VFIO_DMA_MAP_FLAG_NOEXEC flag to the VFIO dma map call, and expose its availability via the capability VFIO_DMA_NOEXEC_IOMMU. This way the user can control whether the XN flag will be set on the requested mappings. The IOMMU_NOEXEC flag needs to be available for all the IOMMUs of the container used. Signed-off-by: Antonios Motakis Signed-off-by: Baptiste Reynal --- include/uapi/linux/vfio.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index 5fb3d46..30801a7 100644 --- a/include/uapi/linux/vfio.h +++ b/include/uapi/linux/vfio.h @@ -31,6 +31,7 @@ enum vfio_iommu_cap { (ex. PCIe NoSnoop stripping) */ VFIO_EEH = 5, /* Check if EEH is supported */ VFIO_TYPE1_NESTING_IOMMU = 6, /* Two-stage IOMMU, implies v2 */ + VFIO_DMA_NOEXEC_IOMMU = 7, }; @@ -397,12 +398,17 @@ struct vfio_iommu_type1_info { * * Map process virtual addresses to IO virtual addresses using the * provided struct vfio_dma_map. Caller sets argsz. READ &/ WRITE required. + * + * To use the VFIO_DMA_MAP_FLAG_NOEXEC flag, the container must support the + * VFIO_DMA_NOEXEC_IOMMU capability. If mappings are created using this flag, + * any groups subsequently added to the container must support this capability. */ struct vfio_iommu_type1_dma_map { __u32 argsz; __u32 flags; #define VFIO_DMA_MAP_FLAG_READ (1 << 0) /* readable from device */ #define VFIO_DMA_MAP_FLAG_WRITE (1 << 1) /* writable from device */ +#define VFIO_DMA_MAP_FLAG_NOEXEC (1 << 2) /* not executable from device */ __u64 vaddr; /* Process virtual address */ __u64 iova; /* IO virtual address */ __u64 size; /* Size of mapping (bytes) */ -- 2.3.1