From: Jason Gunthorpe <jgg@nvidia.com>
To: "Tian, Kevin" <kevin.tian@intel.com>
Cc: "Liu, Yi L" <yi.l.liu@intel.com>,
"joro@8bytes.org" <joro@8bytes.org>,
"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"robin.murphy@arm.com" <robin.murphy@arm.com>,
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"cohuck@redhat.com" <cohuck@redhat.com>,
"eric.auger@redhat.com" <eric.auger@redhat.com>,
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"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"mjrosato@linux.ibm.com" <mjrosato@linux.ibm.com>,
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<shameerali.kolothum.thodi@huawei.com>,
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"iommu@lists.linux.dev" <iommu@lists.linux.dev>,
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<linux-kselftest@vger.kernel.org>,
"Duan, Zhenzhong" <zhenzhong.duan@intel.com>
Subject: Re: [PATCH v3 07/17] iommufd: Add IOMMU_RESV_IOVA_RANGES
Date: Wed, 2 Aug 2023 09:22:50 -0300 [thread overview]
Message-ID: <ZMpKmgPAuQDI2nDx@nvidia.com> (raw)
In-Reply-To: <BN9PR11MB52764C401206FE8D7A4731628C0BA@BN9PR11MB5276.namprd11.prod.outlook.com>
On Wed, Aug 02, 2023 at 01:09:28AM +0000, Tian, Kevin wrote:
> > From: Jason Gunthorpe <jgg@nvidia.com>
> > Sent: Wednesday, August 2, 2023 2:23 AM
> >
> > On Tue, Aug 01, 2023 at 02:40:44AM +0000, Tian, Kevin wrote:
> >
> > > > So, I guess we should leave it like this?
> > > >
> > >
> > > Yes. Along with this discussion (including what you explained for sw_msi)
> > > let's abandon this new cmd and leave it as today.
> >
> > You sure? This makes it basically impossible to write a "correct" vmm
> > that is aware of what the physical memory map must be early on
> >
>
> emmm... I thought it's what you meant by "leave it like this" and the
> fact that existing VMM's memory layout happens to match the reserved
> regions. Nobody complains lacking of such a interface for years then
> we may postpone supporting it until it's really required.
>
> btw even if we add this new cmd now, getting the Qemu support to
> use the aggregated list when creating the guest memory map is not
> a simple task given currently vfio only passively acts on change
> notifications in the guest memory layout. It requires a new mechanism
> to enforce strict order (probe all vfio devices before creating the memory
> layout) and then injects vfio reserved regions into the layout.
>
> Preferably let's not making it a hard dependency for this series.
I see, if qemu won't use it then lets not do it
Jason
next prev parent reply other threads:[~2023-08-02 12:23 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-24 11:03 [PATCH v3 00/17] iommufd: Add nesting infrastructure Yi Liu
2023-07-24 11:03 ` [PATCH v3 01/17] iommu: Add new iommu op to create domains owned by userspace Yi Liu
2023-07-28 9:37 ` Tian, Kevin
2023-07-28 16:56 ` Jason Gunthorpe
2023-07-31 12:44 ` Liu, Yi L
2023-07-31 13:19 ` Jason Gunthorpe
2023-08-03 2:28 ` Nicolin Chen
2023-07-24 11:03 ` [PATCH v3 02/17] iommu: Add nested domain support Yi Liu
2023-07-28 9:38 ` Tian, Kevin
2023-07-28 16:59 ` Jason Gunthorpe
2023-08-03 2:36 ` Nicolin Chen
2023-08-03 2:53 ` Liu, Yi L
2023-08-03 3:04 ` Nicolin Chen
2023-07-24 11:03 ` [PATCH v3 03/17] iommufd/hw_pagetable: Use domain_alloc_user op for domain allocation Yi Liu
2023-07-28 9:39 ` Tian, Kevin
2023-07-24 11:03 ` [PATCH v3 04/17] iommufd: Pass in hwpt_type/parent/user_data to iommufd_hw_pagetable_alloc() Yi Liu
2023-07-28 9:49 ` Tian, Kevin
2023-07-24 11:03 ` [PATCH v3 05/17] iommufd/hw_pagetable: Do not populate user-managed hw_pagetables Yi Liu
2023-07-28 9:51 ` Tian, Kevin
2023-07-24 11:03 ` [PATCH v3 06/17] iommufd: Only enforce IOMMU_RESV_SW_MSI when attaching user-managed HWPT Yi Liu
2023-07-28 10:02 ` Tian, Kevin
2023-07-28 17:06 ` Jason Gunthorpe
2023-07-24 11:03 ` [PATCH v3 07/17] iommufd: Add IOMMU_RESV_IOVA_RANGES Yi Liu
2023-07-28 10:07 ` Tian, Kevin
2023-07-28 17:16 ` Jason Gunthorpe
2023-07-31 6:14 ` Tian, Kevin
2023-07-31 13:12 ` Jason Gunthorpe
2023-07-28 17:44 ` Jason Gunthorpe
2023-07-31 6:21 ` Tian, Kevin
2023-07-31 9:53 ` Liu, Yi L
2023-07-31 13:23 ` Jason Gunthorpe
2023-08-01 2:40 ` Tian, Kevin
2023-08-01 18:22 ` Jason Gunthorpe
2023-08-02 1:09 ` Tian, Kevin
2023-08-02 12:22 ` Jason Gunthorpe [this message]
2023-08-03 1:23 ` Nicolin Chen
2023-08-03 1:25 ` Tian, Kevin
2023-08-03 2:17 ` Nicolin Chen
2023-07-24 11:03 ` [PATCH v3 08/17] iommufd: IOMMU_HWPT_ALLOC allocation with user data Yi Liu
2023-07-28 17:55 ` Jason Gunthorpe
2023-07-28 19:10 ` Nicolin Chen
2023-07-31 7:22 ` Liu, Yi L
2023-07-31 6:31 ` Tian, Kevin
2023-07-31 13:16 ` Jason Gunthorpe
2023-08-01 2:35 ` Tian, Kevin
2023-08-02 23:42 ` Nicolin Chen
2023-08-02 23:43 ` Jason Gunthorpe
2023-08-03 0:53 ` Nicolin Chen
2023-08-03 16:47 ` Jason Gunthorpe
2023-07-24 11:03 ` [PATCH v3 09/17] iommufd: Add IOMMU_HWPT_INVALIDATE Yi Liu
2023-07-28 18:02 ` Jason Gunthorpe
2023-07-31 10:07 ` Liu, Yi L
2023-07-31 13:19 ` Jason Gunthorpe
2023-08-03 2:16 ` Nicolin Chen
2023-08-03 3:07 ` Liu, Yi L
2023-08-03 3:13 ` Nicolin Chen
2023-08-03 2:56 ` Liu, Yi L
2023-08-03 2:07 ` Nicolin Chen
2023-07-24 11:03 ` [PATCH v3 10/17] iommufd/selftest: Add a helper to get test device Yi Liu
2023-07-24 11:04 ` [PATCH v3 11/17] iommufd/selftest: Add IOMMU_TEST_OP_DEV_[ADD|DEL]_RESERVED to add/del reserved regions to selftest device Yi Liu
2023-07-24 11:04 ` [PATCH v3 12/17] iommufd/selftest: Add .get_resv_regions() for mock_dev Yi Liu
2023-07-24 11:04 ` [PATCH v3 13/17] iommufd/selftest: Add coverage for IOMMU_RESV_IOVA_RANGES Yi Liu
2023-07-24 11:04 ` [PATCH v3 14/17] iommufd/selftest: Add domain_alloc_user() support in iommu mock Yi Liu
2023-07-24 11:04 ` [PATCH v3 15/17] iommufd/selftest: Add coverage for IOMMU_HWPT_ALLOC with user data Yi Liu
2023-07-24 11:04 ` [PATCH v3 16/17] iommufd/selftest: Add IOMMU_TEST_OP_MD_CHECK_IOTLB test op Yi Liu
2023-07-24 11:04 ` [PATCH v3 17/17] iommufd/selftest: Add coverage for IOMMU_HWPT_INVALIDATE ioctl Yi Liu
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