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Crash kernel will retrieve the dm crypt keys based on the dmcryptkeys command line parameter. When user space writes the key description to /sys/kernel/config/crash_dm_crypt_key/restore, the crash kernel will save the encryption keys to the user keyring. Then user space e.g. cryptsetup's --volume-key-keyring API can use it to unlock the encrypted device. Link: https://lkml.kernel.org/r/20250502011246.99238-6-coxu@redhat.com Signed-off-by: Coiby Xu <coxu@redhat.com> Acked-by: Baoquan He <bhe@redhat.com> Cc: "Daniel P. Berrange" <berrange@redhat.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Dave Young <dyoung@redhat.com> Cc: Jan Pazdziora <jpazdziora@redhat.com> Cc: Liu Pingfan <kernelfans@gmail.com> Cc: Milan Broz <gmazyland@gmail.com> Cc: Ondrej Kozina <okozina@redhat.com> Cc: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>