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Using the device pager with /dev/kmem is not stable since KVA mappings are transient, but the device pager caches the PA associated with a given offset forever. Interestingly, mips' implementation of memmap() already refused requests for /dev/kmem. Note that kvm_read/kvm_write do not use mmap, but use read and write on /dev/kmem, so this should not affect libkvm users. Reviewed by: kib MFC after: 2 months |
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