CVS commit: src

["Maxime Villard" <maxv%netbsd.org@localhost>]

Module Name:    src
Committed By:   maxv
Date:           Sat Dec 15 13:39:43 UTC 2018

Modified Files:
        src/lib/libnvmm: libnvmm.3 libnvmm.c nvmm.h
        src/sys/dev/nvmm: nvmm.c nvmm_internal.h nvmm_ioctl.h

Log Message:
Invert the mapping logic.

Until now, the "owner" of the memory was the guest, and by calling
nvmm_gpa_map(), the virtualizer was creating a view towards the guest
memory.

Qemu expects the contrary: it wants the owner to be the virtualizer, and
nvmm_gpa_map should just create a view from the guest towards the
virtualizer's address space. Under this scheme, it is legal to have two
GPAs that point to the same HVA.

Introduce nvmm_hva_map() and nvmm_hva_unmap(), that map/unamp the HVA into
a dedicated UOBJ. Change nvmm_gpa_map() and nvmm_gpa_unmap() to just
perform an enter into the desired UOBJ.

With this change in place, all the mapping-related problems in Qemu+NVMM
are fixed.


To generate a diff of this commit:
cvs rdiff -u -r1.4 -r1.5 src/lib/libnvmm/libnvmm.3 src/lib/libnvmm/libnvmm.c
cvs rdiff -u -r1.2 -r1.3 src/lib/libnvmm/nvmm.h
cvs rdiff -u -r1.3 -r1.4 src/sys/dev/nvmm/nvmm.c
cvs rdiff -u -r1.1 -r1.2 src/sys/dev/nvmm/nvmm_internal.h \
    src/sys/dev/nvmm/nvmm_ioctl.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.