root@ujvl:/usr/src # svn stat
M       sys/amd64/amd64/machdep.c
M       sys/amd64/include/pcpu.h
M       sys/conf/files
M       sys/conf/options.amd64
M       sys/conf/options.i386
M       sys/i386/include/pcpu.h
M       sys/modules/Makefile
?       sys/modules/xenhvm
?       sys/xen/xenhvm_mod.c

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root@ujvl:/usr/src # /usr/local/bin/gpatch -p0 < ~sbruno/mod_xenhvm.patch
patching file sys/amd64/amd64/machdep.c
patching file sys/amd64/conf/XENHVM
Reversed (or previously applied) patch detected!  Assume -R? [n] 
Apply anyway? [n] 
Skipping patch.
1 out of 1 hunk ignored -- saving rejects to file sys/amd64/conf/XENHVM.rej
patching file sys/amd64/include/pcpu.h
patching file sys/conf/files
patching file sys/conf/options.amd64
patching file sys/conf/options.i386
patching file sys/i386/conf/XENHVM
Reversed (or previously applied) patch detected!  Assume -R? [n] 
Apply anyway? [n] 
Skipping patch.
1 out of 1 hunk ignored -- saving rejects to file sys/i386/conf/XENHVM.rej
patching file sys/i386/include/pcpu.h
patching file sys/modules/Makefile
patching file sys/modules/xenhvm/Makefile
patching file sys/xen/xenhvm_mod.c