From: Nicolin Chen <nicolinc@nvidia.com>
To: Yi Liu <yi.l.liu@intel.com>
Cc: <joro@8bytes.org>, <alex.williamson@redhat.com>, <jgg@nvidia.com>,
<kevin.tian@intel.com>, <robin.murphy@arm.com>,
<cohuck@redhat.com>, <eric.auger@redhat.com>,
<kvm@vger.kernel.org>, <mjrosato@linux.ibm.com>,
<chao.p.peng@linux.intel.com>, <yi.y.sun@linux.intel.com>,
<peterx@redhat.com>, <jasowang@redhat.com>,
<shameerali.kolothum.thodi@huawei.com>, <lulu@redhat.com>,
<suravee.suthikulpanit@amd.com>, <iommu@lists.linux.dev>,
<linux-kernel@vger.kernel.org>, <linux-kselftest@vger.kernel.org>,
<baolu.lu@linux.intel.com>
Subject: Re: [PATCH 02/17] iommu: Add nested domain support
Date: Tue, 14 Feb 2023 10:47:27 -0800 [thread overview]
Message-ID: <Y+vXP3OJ4hqNvA+S@Asurada-Nvidia> (raw)
In-Reply-To: <20230209043153.14964-3-yi.l.liu@intel.com>
On Wed, Feb 08, 2023 at 08:31:38PM -0800, Yi Liu wrote:
> From: Lu Baolu <baolu.lu@linux.intel.com>
>
> Introduce a new domain type for a user space I/O address, which is nested
> on top of another user space address represented by a UNMANAGED domain. The
> mappings of a nested domain are managed by user space software, therefore
> it's unnecessary to have map/unmap callbacks. But the updates of the PTEs
> in the nested domain page table must be propagated to the caches on both
> IOMMU (IOTLB) and devices (DevTLB).
>
> The nested domain is allocated by the domain_alloc_user op, and attached
> to the device through the existing iommu_attach_device/group() interfaces.
>
> An new domain op, named iotlb_sync_user is added for the userspace to flush
> the hardware caches for a nested domain through iommufd. No wrapper for it
> as it's only supposed to be used by iommufd.
Following the remarks from Jason and Robin in their first looks
at the nested SMMU changes, perhaps we should rename this op
"iotlb_sync_user" back to "cache_invalidate_user" or so, since
the type for the caches on VT-d isn't confined to IOTLB either.
Thanks
Nic
next prev parent reply other threads:[~2023-02-14 18:48 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-09 4:31 [PATCH 00/17] Add Intel VT-d nested translation Yi Liu
2023-02-09 4:31 ` [PATCH 01/17] iommu: Add new iommu op to create domains owned by userspace Yi Liu
2023-02-10 8:24 ` Tian, Kevin
2023-02-11 3:16 ` Baolu Lu
2023-02-09 4:31 ` [PATCH 02/17] iommu: Add nested domain support Yi Liu
2023-02-14 18:47 ` Nicolin Chen [this message]
2023-02-09 4:31 ` [PATCH 03/17] iommu/vt-d: Extend dmar_domain to support nested domain Yi Liu
2023-02-09 4:31 ` [PATCH 04/17] iommu/vt-d: Add helper to setup pasid nested translation Yi Liu
2023-02-09 4:31 ` [PATCH 05/17] iommu/vt-d: Add nested domain support Yi Liu
2023-02-09 4:31 ` [PATCH 06/17] iommufd/hw_pagetable: Use domain_alloc_user op for domain allocation Yi Liu
2023-02-09 17:59 ` Matthew Rosato
2023-02-09 18:36 ` Jason Gunthorpe
2023-02-09 19:51 ` Nicolin Chen
2023-02-09 20:39 ` Jason Gunthorpe
2023-02-09 22:22 ` Nicolin Chen
2023-02-09 23:59 ` Jason Gunthorpe
2023-02-10 10:50 ` Liu, Yi L
2023-02-09 4:31 ` [PATCH 07/17] iommufd: Add/del hwpt to IOAS at alloc/destroy() Yi Liu
2023-02-09 4:31 ` [PATCH 08/17] iommufd: Split iommufd_hw_pagetable_alloc() Yi Liu
2023-02-09 4:31 ` [PATCH 09/17] iommufd: Add kernel-managed hw_pagetable allocation for userspace Yi Liu
2023-02-09 20:45 ` Jason Gunthorpe
2023-02-10 10:52 ` Liu, Yi L
2023-02-09 4:31 ` [PATCH 10/17] iommufd/device: Move IOAS attaching and detaching operations into helpers Yi Liu
2023-02-09 4:31 ` [PATCH 11/17] iommufd: Add infrastructure for user-managed hw_pagetable allocation Yi Liu
2023-02-09 4:31 ` [PATCH 12/17] iommufd: Add " Yi Liu
2023-02-09 4:31 ` [PATCH 13/17] iommufd/device: Report supported stage-1 page table types Yi Liu
2023-02-09 4:31 ` [PATCH 14/17] iommufd/selftest: Add IOMMU_TEST_OP_MOCK_DOMAIN_REPLACE test op Yi Liu
2023-02-14 18:36 ` Nicolin Chen
2023-02-09 4:31 ` [PATCH 15/17] iommufd/selftest: Add coverage for IOMMU_HWPT_ALLOC ioctl Yi Liu
2023-02-09 4:31 ` [PATCH 16/17] iommufd/selftest: Add IOMMU_TEST_OP_MD_CHECK_IOTLB test op Yi Liu
2023-02-09 4:31 ` [PATCH 17/17] iommufd/selftest: Add coverage for IOMMU_HWPT_INVALIDATE ioctl Yi Liu
2023-02-09 10:11 ` [PATCH 00/17] Add Intel VT-d nested translation Shameerali Kolothum Thodi
2023-02-09 16:10 ` Nicolin Chen
2023-02-09 16:16 ` Shameerali Kolothum Thodi
2023-02-17 18:20 ` Nicolin Chen
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