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Fri, 12 Apr 2024 20:47:52 -0700 From: Nicolin Chen To: , , , , CC: , , , , , , , , , , , Subject: [PATCH RFCv1 13/14] iommufd: Add mmap infrastructure Date: Fri, 12 Apr 2024 20:47:10 -0700 Message-ID: <6fef9ff9944381d51dd18f83ec03785a26754dcf.1712978213.git.nicolinc@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN3PEPF0000B069:EE_|PH7PR12MB6956:EE_ X-MS-Office365-Filtering-Correlation-Id: 8471bda9-bb20-443c-b308-08dc5b6c86c7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.232;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230031)(7416005)(82310400014)(376005)(36860700004)(1800799015);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Apr 2024 03:48:05.3722 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8471bda9-bb20-443c-b308-08dc5b6c86c7 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN3PEPF0000B069.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB6956 Content-Type: text/plain; charset="utf-8" Add for sharing the kernel page with user space. This allows to pass through HW resource (VCMDQ MMIO pages for example) to user space VMM and guest OS. Use vma->vm_pgoff as the carrier of a viommu_id. Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/main.c | 40 ++++++++++++++++++++++++++++++++++++ include/linux/iommufd.h | 4 ++++ 2 files changed, 44 insertions(+) diff --git a/drivers/iommu/iommufd/main.c b/drivers/iommu/iommufd/main.c index 96ef81530809..5b401c80cca8 100644 --- a/drivers/iommu/iommufd/main.c +++ b/drivers/iommu/iommufd/main.c @@ -16,6 +16,7 @@ #include #include #include +#include #include =20 #include "io_pagetable.h" @@ -427,11 +428,50 @@ static long iommufd_fops_ioctl(struct file *filp, uns= igned int cmd, return ret; } =20 +static int iommufd_fops_mmap(struct file *filp, struct vm_area_struct *vma) +{ + struct iommufd_ctx *ictx =3D filp->private_data; + size_t size =3D vma->vm_end - vma->vm_start; + u32 viommu_id =3D (u32)vma->vm_pgoff; + struct iommufd_viommu *viommu; + unsigned long pfn; + int rc; + + if (size > PAGE_SIZE) + return -EINVAL; + + viommu =3D container_of(iommufd_get_object(ictx, viommu_id, + IOMMUFD_OBJ_VIOMMU), + struct iommufd_viommu, obj); + if (IS_ERR(viommu)) + return PTR_ERR(viommu); + + if (!viommu->ops->get_mmap_pfn) { + rc =3D -EOPNOTSUPP; + goto out_put_viommu; + } + + pfn =3D viommu->ops->get_mmap_pfn(viommu, size); + if (!pfn) { + rc =3D -ENOMEM; + goto out_put_viommu; + } + + vma->vm_pgoff =3D 0; + vma->vm_page_prot =3D pgprot_noncached(vma->vm_page_prot); + vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP); + rc =3D remap_pfn_range(vma, vma->vm_start, pfn, size, vma->vm_page_prot); +out_put_viommu: + iommufd_put_object(ictx, &viommu->obj); + return rc; +} + static const struct file_operations iommufd_fops =3D { .owner =3D THIS_MODULE, .open =3D iommufd_fops_open, .release =3D iommufd_fops_release, .unlocked_ioctl =3D iommufd_fops_ioctl, + .mmap =3D iommufd_fops_mmap, }; =20 /** diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h index 707b6d4b20a3..4a9c6b281d35 100644 --- a/include/linux/iommufd.h +++ b/include/linux/iommufd.h @@ -104,6 +104,8 @@ struct iommufd_viommu { * the include/uapi/linux/iommufd.h header. * @vqueue_free: Free all driver-specific parts of an iommufd_vqueue. The = memory * of the iommufd_vqueue will be free-ed by iommufd core + * @get_mmap_pfn: Return the PFN of a viommu given a finite size, for user= space + * to mmap the page(s). */ struct iommufd_viommu_ops { void (*free)(struct iommufd_viommu *viommu); @@ -114,6 +116,8 @@ struct iommufd_viommu_ops { struct iommufd_viommu *viommu, const struct iommu_user_data *user_data); void (*vqueue_free)(struct iommufd_vqueue *vqueue); + unsigned long (*get_mmap_pfn)(struct iommufd_viommu *viommu, + size_t pgsize); }; =20 struct iommufd_vqueue { --=20 2.43.0