On Fri, 17 Mar 2023 at 14:46, Richard Henderson <richard.hender...@linaro.org> wrote: > > On 3/7/23 02:17, Peter Maydell wrote: > > It looks like we (inadvertently) broke "-R 0 means turn off" > > in 2019 with commit dc18baaef36d95e5; prior to that the > > 64-on-32 default was set by the initial value of the global > > variable and could be overridden on the command line. After > > that we ended up doing the default-value stuff after the > > command line was parsed instead. > > (Not 64-on-32, but 32-on-64.) > > I don't understand how 32-on-64 would ever work without reserved_va. The > host kernel > would otherwise place mmap blocks anywhere it chooses, which may not be > within 4GB of any > given guest_base.
I think most of the use cases weren't doing mmap of any kind. The gcc test suite is one example of that. -- PMM
