Re: [PATCH V4 0/5] fixes for virtual address update

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On Wed, 14 Dec 2022 13:24:52 -0800
Steve Sistare <steven.sistare@xxxxxxxxxx> wrote:

> Fix bugs in the interfaces that allow the underlying memory object of an
> iova range to be mapped in a new address space.  They allow userland to
> indefinitely block vfio mediated device kernel threads, and do not
> propagate the locked_vm count to a new mm.
> 
> The fixes impose restrictions that eliminate waiting conditions, so
> revert the dead code:
>   commit 898b9eaeb3fe ("vfio/type1: block on invalid vaddr")
>   commit 487ace134053 ("vfio/type1: implement notify callback")
>   commit ec5e32940cc9 ("vfio: iommu driver notify callback")
> 
> Changes in V2 (thanks Alex):
>   * do not allow group attach while vaddrs are invalid
>   * add patches to delete dead code
>   * add WARN_ON for never-should-happen conditions
>   * check for changed mm in unmap.
>   * check for vfio_lock_acct failure in remap
> 
> Changes in V3 (ditto!):
>   * return errno at WARN_ON sites, and make it unique
>   * correctly check for dma task mm change
>   * change dma owner to current when vaddr is updated
>   * add Fixes to commit messages
>   * refactored new code in vfio_dma_do_map
> 
> Changes in V4:
>   * misc cosmetic changes
> 
> Steve Sistare (5):
>   vfio/type1: exclude mdevs from VFIO_UPDATE_VADDR
>   vfio/type1: prevent locked_vm underflow
>   vfio/type1: revert "block on invalid vaddr"
>   vfio/type1: revert "implement notify callback"
>   vfio: revert "iommu driver notify callback"
> 
>  drivers/vfio/container.c        |   5 -
>  drivers/vfio/vfio.h             |   7 --
>  drivers/vfio/vfio_iommu_type1.c | 199 +++++++++++++++++++---------------------
>  include/uapi/linux/vfio.h       |  15 +--
>  4 files changed, 103 insertions(+), 123 deletions(-)
> 

Looks ok to me.  Jason, Kevin, I'd appreciate your reviews regarding
whether this sufficiently addresses the outstanding issues to keep this
interface around until we have a re-implementation in iommufd.  Thanks,

Alex




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