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IOMMUFD backend backport

Eric Auger requested to merge eauger1/centos-qemu-kvm:iommufd-be into c9s

Backport the IOMMUFD backend code and follow-up fixes

JIRA: RHEL-19302

JIRA: RHEL-21057

Upstream: YES + 3 downstream-only patches enabling the compilation of IOMMUD object on aarch64/x86_64/s390x

Brew: http://brewweb.engineering.redhat.com/brew/taskinfo?taskID=58021397

Test: tested on ARM and x86_64 with and without iommufd including hotplug

Includes patches pulled by https://lore.kernel.org/all/20231219185643.725448-1-clg@redhat.com/ https://lore.kernel.org/all/20240108073232.118228-1-clg@redhat.com/

Signed-off-by: Eric Auger eric.auger@redhat.com

Edited by Eric Auger

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