antoine 8156c46154 vmmdev: return EFAULT when trying to read beyond VM system memory max address
Currently, when using dd(1) to take a VM memory image, the capture never ends,
reading zeroes when it's beyond VM system memory max address.
Return EFAULT when trying to read beyond VM system memory max address.

Reviewed by:	imp, grehan, anish
Approved by:	grehan
Differential Revision:	https://reviews.freebsd.org/D15156
2018-05-15 17:20:58 +00:00
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