Andreas Färber <afaer...@suse.de> writes: > Am 15.08.2013 15:12, schrieb Anthony Liguori: >> Everyone is talking past each other and no one is addressing the real >> problem. There are two distinct issues here: >> >> 1) We have two ABIs that cannot be changed unless there's a very good >> reason to. Alexey's original patch breaks both. The guest ABI >> cannot change given a fixed command line. >> >> IOW, the exposed PVR value for -cpu POWER7 cannot change across >> versions of QEMU or when running on different hardware. This breaks >> live migration and save/resume. >> >> We also cannot break the command line interface. If the last version >> of QEMU supported -cpu POWER7_v2.1, then we must continue to support >> that. > > 1a) How should -cpu 0xDEADBEEF or -cpu DEADBEEF behave. > > I expect it to error out as before
Correct although that can't be guaranteed. Maybe there is a 'DEADBEEF' cpu model in the future. This is the architecture of the ripvanwinkle and eieio instructions after all :-) > rather than applying the same fuzz/mask that -cpu host might. Fuzzing CPU models sounds like an awful idea to me. Regards, Anthony Liguori > That would let us implement our own fuzz logic in kvm.c, > operating on a GSList of ObjectClasses to handle multiple matches. > > Regards, > Andreas
