| Message ID | 20230928071528.26258-2-yi.l.liu@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | iommufd support allocating nested parent domain | expand |
> From: Liu, Yi L <yi.l.liu@intel.com> > Sent: Thursday, September 28, 2023 3:15 PM > > Introduce a new iommu_domain op to create domains owned by userspace, > e.g. through IOMMUFD. These domains have a few different properties > compares to kernel owned domains: > > - They may be UNMANAGED domains, but created with special parameters. > For instance aperture size changes/number of levels, different > IOPTE formats, or other things necessary to make a vIOMMU work > > - We have to track all the memory allocations with GFP_KERNEL_ACCOUNT > to make the cgroup sandbox stronger > > - Device-specialty domains, such as NESTED domains can be created by > IOMMUFD. > > The new op clearly says the domain is being created by IOMMUFD, that > the domain is intended for userspace use, and it provides a way to pass > user flags or a driver specific uAPI structure to customize the created > domain to exactly what the vIOMMU userspace driver requires. > > iommu drivers that cannot support VFIO/IOMMUFD should not support this > op. This includes any driver that cannot provide a fully functional > UNMANAGED domain. > > This new op for now is only supposed to be used by IOMMUFD, hence no > wrapper for it. IOMMUFD would call the callback directly. As for domain > free, IOMMUFD would use iommu_domain_free(). > > Suggested-by: Jason Gunthorpe <jgg@nvidia.com> > Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> > Co-developed-by: Nicolin Chen <nicolinc@nvidia.com> > Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> > Signed-off-by: Yi Liu <yi.l.liu@intel.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com>
On Thu, Sep 28, 2023 at 12:15:23AM -0700, Yi Liu wrote: > diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h > index b4ba0c0cbab6..4a7c5c8fdbb4 100644 > --- a/include/uapi/linux/iommufd.h > +++ b/include/uapi/linux/iommufd.h > @@ -347,10 +347,20 @@ struct iommu_vfio_ioas { > }; > #define IOMMU_VFIO_IOAS _IO(IOMMUFD_TYPE, IOMMUFD_CMD_VFIO_IOAS) > > +/** > + * enum iommufd_hwpt_alloc_flags - Flags for HWPT allocation > + * @IOMMU_HWPT_ALLOC_NEST_PARENT: If set, allocate a domain which can serve > + * as the parent domain in the nesting > + * configuration. I just noticed a nit here: we should probably align with other parts of this file by using "HWPT" v.s. "domain"? I.e. + * @IOMMU_HWPT_ALLOC_NEST_PARENT: If set, allocate a HWPT which can serve + * as the parent HWPT in the nesting + * configuration. Thanks Nic
On Sun, Oct 15, 2023 at 12:14:01AM -0700, Nicolin Chen wrote: > On Thu, Sep 28, 2023 at 12:15:23AM -0700, Yi Liu wrote: > > > diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h > > index b4ba0c0cbab6..4a7c5c8fdbb4 100644 > > --- a/include/uapi/linux/iommufd.h > > +++ b/include/uapi/linux/iommufd.h > > @@ -347,10 +347,20 @@ struct iommu_vfio_ioas { > > }; > > #define IOMMU_VFIO_IOAS _IO(IOMMUFD_TYPE, IOMMUFD_CMD_VFIO_IOAS) > > > > +/** > > + * enum iommufd_hwpt_alloc_flags - Flags for HWPT allocation > > + * @IOMMU_HWPT_ALLOC_NEST_PARENT: If set, allocate a domain which can serve > > + * as the parent domain in the nesting > > + * configuration. > > I just noticed a nit here: we should probably align with other > parts of this file by using "HWPT" v.s. "domain"? I.e. > > + * @IOMMU_HWPT_ALLOC_NEST_PARENT: If set, allocate a HWPT which can serve > + * as the parent HWPT in the nesting > + * configuration. Yes Jason
On Mon, Oct 16, 2023 at 09:04:54AM -0300, Jason Gunthorpe wrote: > On Sun, Oct 15, 2023 at 12:14:01AM -0700, Nicolin Chen wrote: > > On Thu, Sep 28, 2023 at 12:15:23AM -0700, Yi Liu wrote: > > > > > diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h > > > index b4ba0c0cbab6..4a7c5c8fdbb4 100644 > > > --- a/include/uapi/linux/iommufd.h > > > +++ b/include/uapi/linux/iommufd.h > > > @@ -347,10 +347,20 @@ struct iommu_vfio_ioas { > > > }; > > > #define IOMMU_VFIO_IOAS _IO(IOMMUFD_TYPE, IOMMUFD_CMD_VFIO_IOAS) > > > > > > +/** > > > + * enum iommufd_hwpt_alloc_flags - Flags for HWPT allocation > > > + * @IOMMU_HWPT_ALLOC_NEST_PARENT: If set, allocate a domain which can serve > > > + * as the parent domain in the nesting > > > + * configuration. > > > > I just noticed a nit here: we should probably align with other > > parts of this file by using "HWPT" v.s. "domain"? I.e. > > > > + * @IOMMU_HWPT_ALLOC_NEST_PARENT: If set, allocate a HWPT which can serve > > + * as the parent HWPT in the nesting > > + * configuration. > > Yes Should we resend? Or would it be possible for you to update it in your for-next tree?
On Mon, Oct 16, 2023 at 10:46:10AM -0700, Nicolin Chen wrote: > On Mon, Oct 16, 2023 at 09:04:54AM -0300, Jason Gunthorpe wrote: > > On Sun, Oct 15, 2023 at 12:14:01AM -0700, Nicolin Chen wrote: > > > On Thu, Sep 28, 2023 at 12:15:23AM -0700, Yi Liu wrote: > > > > > > > diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h > > > > index b4ba0c0cbab6..4a7c5c8fdbb4 100644 > > > > --- a/include/uapi/linux/iommufd.h > > > > +++ b/include/uapi/linux/iommufd.h > > > > @@ -347,10 +347,20 @@ struct iommu_vfio_ioas { > > > > }; > > > > #define IOMMU_VFIO_IOAS _IO(IOMMUFD_TYPE, IOMMUFD_CMD_VFIO_IOAS) > > > > > > > > +/** > > > > + * enum iommufd_hwpt_alloc_flags - Flags for HWPT allocation > > > > + * @IOMMU_HWPT_ALLOC_NEST_PARENT: If set, allocate a domain which can serve > > > > + * as the parent domain in the nesting > > > > + * configuration. > > > > > > I just noticed a nit here: we should probably align with other > > > parts of this file by using "HWPT" v.s. "domain"? I.e. > > > > > > + * @IOMMU_HWPT_ALLOC_NEST_PARENT: If set, allocate a HWPT which can serve > > > + * as the parent HWPT in the nesting > > > + * configuration. > > > > Yes > > Should we resend? Or would it be possible for you to update it > in your for-next tree? At this point send a Fixes: patch Jason
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index c50a769d569a..3861d66b65c1 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -234,7 +234,15 @@ struct iommu_iotlb_gather { * op is allocated in the iommu driver and freed by the caller after * use. The information type is one of enum iommu_hw_info_type defined * in include/uapi/linux/iommufd.h. - * @domain_alloc: allocate iommu domain + * @domain_alloc: allocate and return an iommu domain if success. Otherwise + * NULL is returned. The domain is not fully initialized until + * the caller iommu_domain_alloc() returns. + * @domain_alloc_user: Allocate an iommu domain corresponding to the input + * parameters as defined in include/uapi/linux/iommufd.h. + * Unlike @domain_alloc, it is called only by IOMMUFD and + * must fully initialize the new domain before return. + * Upon success, a domain is returned. Upon failure, + * ERR_PTR must be returned. * @probe_device: Add device to iommu driver handling * @release_device: Remove device from iommu driver handling * @probe_finalize: Do final setup work after the device is added to an IOMMU @@ -267,6 +275,7 @@ struct iommu_ops { /* Domain allocation and freeing by the iommu driver */ struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type); + struct iommu_domain *(*domain_alloc_user)(struct device *dev, u32 flags); struct iommu_device *(*probe_device)(struct device *dev); void (*release_device)(struct device *dev); diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h index b4ba0c0cbab6..4a7c5c8fdbb4 100644 --- a/include/uapi/linux/iommufd.h +++ b/include/uapi/linux/iommufd.h @@ -347,10 +347,20 @@ struct iommu_vfio_ioas { }; #define IOMMU_VFIO_IOAS _IO(IOMMUFD_TYPE, IOMMUFD_CMD_VFIO_IOAS) +/** + * enum iommufd_hwpt_alloc_flags - Flags for HWPT allocation + * @IOMMU_HWPT_ALLOC_NEST_PARENT: If set, allocate a domain which can serve + * as the parent domain in the nesting + * configuration. + */ +enum iommufd_hwpt_alloc_flags { + IOMMU_HWPT_ALLOC_NEST_PARENT = 1 << 0, +}; + /** * struct iommu_hwpt_alloc - ioctl(IOMMU_HWPT_ALLOC) * @size: sizeof(struct iommu_hwpt_alloc) - * @flags: Must be 0 + * @flags: Combination of enum iommufd_hwpt_alloc_flags * @dev_id: The device to allocate this HWPT for * @pt_id: The IOAS to connect this HWPT to * @out_hwpt_id: The ID of the new HWPT