From: Eric Auger <eric.auger@redhat.com>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: eric.auger.pro@gmail.com, yi.l.liu@intel.com, yi.y.sun@intel.com,
alex.williamson@redhat.com, clg@redhat.com,
qemu-devel@nongnu.org, david@gibson.dropbear.id.au,
thuth@redhat.com, farman@linux.ibm.com, mjrosato@linux.ibm.com,
akrowiak@linux.ibm.com, pasic@linux.ibm.com,
jjherne@linux.ibm.com, jasowang@redhat.com, kvm@vger.kernel.org,
nicolinc@nvidia.com, kevin.tian@intel.com, chao.p.peng@intel.com,
peterx@redhat.com, shameerali.kolothum.thodi@huawei.com,
zhangfei.gao@linaro.org, berrange@redhat.com, apopple@nvidia.com,
suravee.suthikulpanit@amd.com
Subject: Re: [RFC v3 16/18] vfio/iommufd: Implement the iommufd backend
Date: Wed, 1 Feb 2023 16:42:57 +0100 [thread overview]
Message-ID: <a430b451-2eaa-2dc2-4223-20d5275c3ca3@redhat.com> (raw)
In-Reply-To: <Y9mkriFLL43OGbHq@nvidia.com>
Hi Jason,
On 2/1/23 00:30, Jason Gunthorpe wrote:
> On Tue, Jan 31, 2023 at 09:53:03PM +0100, Eric Auger wrote:
>> From: Yi Liu <yi.l.liu@intel.com>
>>
>> Add the iommufd backend. The IOMMUFD container class is implemented
>> based on the new /dev/iommu user API. This backend obviously depends
>> on CONFIG_IOMMUFD.
>>
>> So far, the iommufd backend doesn't support live migration and
>> cache coherency yet due to missing support in the host kernel meaning
>> that only a subset of the container class callbacks is implemented.
> What is missing for cache coherency? I spent lots of time on that
> already, I thought I got everything..
I don't think there is anything missing anymore. This was about
KVM_DEV_VFIO_GROUP_ADD/DEL. With the advent of KVM_DEV_VFIO_FILE_ADD/DEL
we should be able to bridge the gap. However This RFCv3 does not support
that yet in the IOMMUFD backend. We will add this support in the next
version.
Thanks
Eric
>
> Jason
>
next prev parent reply other threads:[~2023-02-01 15:43 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-31 20:52 [RFC v3 00/18] vfio: Adopt iommufd Eric Auger
2023-01-31 20:52 ` [RFC v3 01/18] scripts/update-linux-headers: Add iommufd.h Eric Auger
2023-01-31 20:52 ` [RFC v3 02/18] linux-headers: Import vfio.h and iommufd.h Eric Auger
2023-01-31 20:52 ` [RFC v3 03/18] vfio/common: Move IOMMU agnostic helpers to a separate file Eric Auger
2023-01-31 20:52 ` [RFC v3 04/18] vfio/common: Introduce vfio_container_add|del_section_window() Eric Auger
2023-01-31 20:52 ` [RFC v3 05/18] vfio/common: Move legacy VFIO backend code into separate container.c Eric Auger
2023-01-31 20:52 ` [RFC v3 06/18] vfio/common: Rename into as.c Eric Auger
2023-01-31 20:52 ` [RFC v3 07/18] vfio: Add base container Eric Auger
2023-01-31 20:52 ` [RFC v3 08/18] vfio/container: Introduce vfio_[attach/detach]_device Eric Auger
2023-01-31 20:52 ` [RFC v3 09/18] vfio/platform: Use vfio_[attach/detach]_device Eric Auger
2023-01-31 20:52 ` [RFC v3 10/18] vfio/ap: " Eric Auger
2023-01-31 20:52 ` [RFC v3 11/18] vfio/ccw: " Eric Auger
2023-03-03 17:30 ` Matthew Rosato
2023-03-08 10:56 ` Eric Auger
2023-01-31 20:52 ` [RFC v3 12/18] vfio/container-base: Introduce [attach/detach]_device container callbacks Eric Auger
2023-01-31 20:53 ` [RFC v3 13/18] vfio/container-base: Introduce VFIOContainer reset callback Eric Auger
2023-01-31 20:53 ` [RFC v3 14/18] backends/iommufd: Introduce the iommufd object Eric Auger
2023-02-15 23:48 ` Nicolin Chen
2023-02-16 7:58 ` Eric Auger
2023-01-31 20:53 ` [RFC v3 15/18] util/char_dev: Add open_cdev() Eric Auger
2023-01-31 20:53 ` [RFC v3 16/18] vfio/iommufd: Implement the iommufd backend Eric Auger
2023-01-31 23:30 ` Jason Gunthorpe
2023-02-01 15:42 ` Eric Auger [this message]
2023-01-31 20:53 ` [RFC v3 17/18] vfio/iommufd: Add IOAS_COPY_DMA support Eric Auger
2023-01-31 20:53 ` [RFC v3 18/18] vfio/as: Allow the selection of a given iommu backend Eric Auger
2023-02-03 12:51 ` Jason Gunthorpe
2023-02-03 17:57 ` Eric Auger
2023-02-03 18:01 ` Jason Gunthorpe
2023-02-03 12:57 ` [RFC v3 00/18] vfio: Adopt iommufd Jason Gunthorpe
2023-02-03 18:03 ` Eric Auger
2023-02-03 18:07 ` Jason Gunthorpe
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