>-----Original Message----- >From: Jason Gunthorpe <j...@nvidia.com> >Sent: Thursday, September 21, 2023 2:20 AM >Subject: Re: [PATCH v1 15/22] Add iommufd configure option > >On Wed, Sep 20, 2023 at 12:17:24PM -0600, Alex Williamson wrote: > >> > The iommufd design requires one open of the /dev/iommu to be shared >> > across all the vfios. >> >> "requires"? It's certainly of limited value to have multiple iommufd >> instances rather than create multiple address spaces within a single >> iommufd, but what exactly precludes an iommufd per device if QEMU, or >> any other userspace so desired? Thanks, > >From the kernel side requires is too strong I suppose > >Not sure about these qemu patches though? I had ever tested with multiple IOMMUFDs and mix of IOMMUFD/legacy BE linking to different VFIO devices with this series, all works fine. Thanks Zhenzhong
- Re: [PATCH v1 15/22] Add iommufd configure option Cédric Le Goater
- RE: [PATCH v1 15/22] Add iommufd configure optio... Duan, Zhenzhong
- Re: [PATCH v1 15/22] Add iommufd configure o... Cédric Le Goater
- Re: [PATCH v1 15/22] Add iommufd configu... Jason Gunthorpe
- Re: [PATCH v1 15/22] Add iommufd con... Cédric Le Goater
- Re: [PATCH v1 15/22] Add iommuf... Eric Auger
- Re: [PATCH v1 15/22] Add io... Jason Gunthorpe
- Re: [PATCH v1 15/22] Ad... Alex Williamson
- Re: [PATCH v1 15/22] Ad... Jason Gunthorpe
- RE: [PATCH v1 15/22] Ad... Duan, Zhenzhong
- RE: [PATCH v1 15/22] Ad... Tian, Kevin
- RE: [PATCH v1 15/22] Add iommuf... Duan, Zhenzhong
- Re: [PATCH v1 15/22] Add iommufd con... Daniel P . Berrangé
- Re: [PATCH v1 15/22] Add iommuf... Jason Gunthorpe
- RE: [PATCH v1 15/22] Add iommufd configu... Duan, Zhenzhong
- Re: [PATCH v1 15/22] Add iommufd configure o... Alex Williamson
- Re: [PATCH v1 15/22] Add iommufd configu... Jason Gunthorpe
- Re: [PATCH v1 15/22] Add iommufd con... Alex Williamson
- Re: [PATCH v1 15/22] Add iommufd configu... Daniel P . Berrangé