use only sysctl and no kvm (implementing /dev/mem for a rump kernel
would probably not be hard, but still a non-zero effort).
Note: since there is absolutely no network activity in a fresh rump
kernel, rump.netstat usually displays exactly nothing when invoked
without parameters. Arguments like -r, -bi, -p icmp etc. produce
more stuff.
that while modstat and modunload and builtin modules work exactly
the same as in the host case, modload loads file system kernel
modules from the rump kernel namespace. By default, archs which
have rump support for the kernel kernel ABI have the host module
directory mapped into the rump kernel namespace at the same location
(/stand/...). Therefore, if the *host* module directory is populated,
"rump.modload foo" will work as expected. Otherwise, RUMP_MODULEBASE
can be used to point to the module directory.
conventions and split the NOTES into CAVEATS (all these really highlight the
work-in-progress nature of the modules). Split the note about security into
SECURITY CONSIDERATIONS. Add an EXAMPLE on how to manually update modules.
to match its use in pci_bus_maxdevs. This makes it the same as pci_conf_read
and pci_conf_write.
Change all struct device * to device_t.
[Obviously nothing ever used the first argument to pc_bus_maxdevs since it
could have never worked because it wasn't being passed a pci_chipset_tag_t.]
different code path than using dlopen() before rump_init(), since
the former uses the in-kernel linker and the latter links the object
in rtld).
So:
golem> ./rump_server -l librumpvfs.so -m /sys/modules/tmpfs/tmpfs.kmod unix:///tmp/commsuck
==>
golem> env RUMP_SERVER=unix:///tmp/commsuck rump.modstat
NAME CLASS SOURCE REFS SIZE REQUIRES
suser secmodel builtin 0 - -
tmpfs vfs filesys 0 16713 -
wapbl vfs builtin 0 - -
Source is filesys instead of builtin, as expected.
Notably, for -m you *must* use -l librumpvfs.so. This is because
you need VFS in your kernel to be able to load modules from the
file system. In a regular kernel "librumpvfs.so" is linked at
kernel build time and loaded by the bootloader. Here we use dlopen()
for both effects (the other choices would have been to link
rump_server with -lrumpvfs, but that would limit the flexibility,
or link tmpfs.kmod directly into the binary, but that would limit
the flexibility even more).
