This patchset improves support for sched_* syscalls under user emulation. The first commit adds support for sched_g/setattr that was previously not implemented. There is no equivalent for these syscalls in libc, so I needed to redefine the struct from kernel. It can't be included directly because of conflict with libc sched headers.
The second commit fixes sched_g/setscheduler and sched_g/setparam, when QEMU is built with musl. Musl does not implement these due to conflict between what these functions should do in syscalls and libc https://git.musl-libc.org/cgit/musl/commit/?id=1e21e78bf7a5c24c217446d8760be7b7188711c2 . I've changed it to call syscall directly what should always be the expected behavior for the user. Via https://github.com/tonistiigi/binfmt/pull/70 with additional tests. Changes v1->v2: - Locking guest addresses for sched_attr is now based on size inputs, not local struct size. Also did the same for setter where I now read only the size field of the struct first. - Use offsetof() when checking if optional fields are supported. - `target_sched_attr` now uses aligned types as requested. I didn't quite understand why this is needed as I don't see same in kernel headers, but as this type uses only constant width fields and is already aligned by default it can't break anything. - Fixed formatting. - Defined own `target_sched_param` struct as requested. Tonis Tiigi (2): linux-user: add sched_getattr support linux-user: call set/getscheduler set/getparam directly linux-user/syscall.c | 112 +++++++++++++++++++++++++++++++++----- linux-user/syscall_defs.h | 18 ++++++ 2 files changed, 117 insertions(+), 13 deletions(-) -- 2.32.0 (Apple Git-132)
