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Enable virtio-mem as tech-preview for aarch64

Gavin Shan requested to merge (removed):bug2044155 into main

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2044155
Depends: https://bugzilla.redhat.com/show_bug.cgi?id=2062054
Brew: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=44725989
Upstream Status: v5.18 and RHEL-only for config changes
Tested: Memory can be added and removed through virtio-mem device

This enables virtio-mem device as tech-preview for aarch64 on RHEL9.
All the commits except the last one related to config changes are all
in upstream.

PATCH[01] Fixes the potential race condition for hot-added memory
PATCH[02-03] Enable virtio-mem device from Kconfig
PATCH[04] RHEL-only, enable CONFIG_VIRTIO_MEM=m for aarch64

Besides, this series bases on that for the dependent bug (2062054)
and its MR. The dependent MR or branch has only one commit.

53030a1c ("arm64: enable CONFIG_MEMORY_HOTREMOVE")

Signed-off-by: Gavin Shan gshan@redhat.com

Edited by Gavin Shan

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