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2021-07-02T05:25:41.988517Z
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bhyvectl: print a better error message when vm_open() fails

libvmm: explicitly save and restore errno in vm_open()

Use errno to print a more descriptive error message when vm_open() fails

PR:             250671
Reviewed by:	grehan
Differential Revision:	https://reviews.freebsd.org/D29109

(cherry picked from commit 6bb140e3ca895a148f32c93d50f93619bf735f73)
(cherry picked from commit a7f81b488df2d4a5dcd785b4112e04ffb6ca0442)

Git Hash:   e63372af710790e6d583a0f1f7d0a3a6e55b5369
Git Author: marko@apache.org
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