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Provide atomic KVM Memop for Key-Checked Compare-and-swap

Thomas Huth requested to merge thuth/kernel-cs-9:bz2183983 into main

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2183983

This provides an extension for KVM userspace application to do atomic compare-and-swap operations in guest memory. Tested it with the KVM selftests.

Signed-off-by: Thomas Huth thuth@redhat.com

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