On Wed, Mar 02, 2016 at 11:38:34PM +0000, André Przywara wrote: > On 02/03/16 03:00, Will Deacon wrote: > > On Wed, Feb 24, 2016 at 03:33:08PM +0000, Andre Przywara wrote: > >> The pre_init stub consists of two syscalls mouting the host's FS > >> via 9pfs and then calling the actual init binary, which can now > >> use normal dynamic linking. > >> Based on the x86 code provide an ARM and ARM64 implementation of > >> that. Beside removing the need for static linkage it reduces the > >> size of the kvmtool binary by quite a lot (numbers for aarch64): > >> > >> -rwxr-xr-x 1 root root 9952 Nov 16 14:37 guest/init > >> -rwxr-xr-x 1 root root 512 Nov 16 14:37 guest/pre_init > >> -rwxr-xr-x 2 root root 1284704 Nov 16 14:37 lkvm > >> vs. the old version: > >> -rwxr-xr-x 1 root root 776024 Nov 16 14:38 guest/init > >> -rwxr-xr-x 2 root root 2050112 Nov 16 14:38 lkvm > >> > >> Tested on Midway and Juno. > > > > Hmm, I'm not super keen on switching behaviour like this on arm, where > > it's not uncommon to build a static lkvm and transfer it to a remote > > target and expect init to work. > > So are you concerned about a fully static root file system on the host, > which does not provide libc.so and/or ld-linux.so at all? Is that really > a use case? I had the impression that people use a statically linked > kvmtool to avoid dependencies like to libfdt.so. Right. There are certainly environments where kvmtool is used that don't have a dynanmic linker, and I'd really like lkvm-static to work there. > > Perhaps we could only do this when building a dynamic executable? > > This is of course an option as well. I think it's the right thing to do. Will -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
