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Clients of the > application experience a brief suspension of service, on the order of > 100's of milliseconds, but are otherwise unaffected. > > Define the IOMMU_IOAS_CHANGE_PROCESS ioctl to allow management and use > of an iommufd device to be transferred from one process to another. The > application is responsible for transferring the device descriptor to the new > process, eg either by preservation across fork and exec or via SCM_RIGHTS. > > All memory objects that were mapped for iommufd DMA in the old process > must also be mapped in the new process, but they may have different virtual > addresses in the new. The application passes an array of new addresses to > IOMMU_IOAS_CHANGE_PROCESS, and it atomically updates everything to the current > process, grabbing the new mm, transferring pinned page counts, and recording > new virtual addresses. > > If the application directly exec's the new version of itself, it must take > special care if the mappings may be accessed by kernel threads, such as by > vfio mdevs. The original process must fork an identical caretaker > process which calls VFIO_IOAS_CHANGE_PROCESS to take temporary ownership > of the mappings without changing VA's. The original process then exec's > its successor, which calls VFIO_IOAS_CHANGE_PROCESS with new VA's to take > ownership from the caretaker. > > Thanks to Jason Gunthorpe for code and ideas in this series. > > This is implemented in QEMU by the patch series "Live update: iommufd" > https://lore.kernel.org/qemu-devel (to be posted shortly) https://lore.kernel.org/qemu-devel/1721502937-87102-1-git-send-email-steven.sistare@oracle.com - steve > Steve Sistare (4): > iommufd: Export do_update_pinned > iommufd: Lock all objects > iommufd: Add IOMMU_IOAS_CHANGE_PROCESS > iommufd: update VA > > drivers/iommu/iommufd/io_pagetable.h | 6 + > drivers/iommu/iommufd/ioas.c | 291 ++++++++++++++++++++++++++++++++ > drivers/iommu/iommufd/iommufd_private.h | 2 + > drivers/iommu/iommufd/main.c | 3 + > drivers/iommu/iommufd/pages.c | 10 +- > include/uapi/linux/iommufd.h | 56 ++++++ > 6 files changed, 363 insertions(+), 5 deletions(-) >