kernel/linux.git/arch/um/os-Linux/skas, branch linux-4.16.y

um: Fix FP register size for XSTATE/XSAVE

2017-09-13T20:24:38+00:00

Hard code max size. Taken from https://sourceware.org/git/?p=binutils-gdb.git;a=blob;f=gdb/common/x86-xstate.h Signed-off-by: Thomas Meyer Signed-off-by: Richard Weinberger

um: Add kerneldoc for userspace_tramp() and start_userspace()

2017-07-07T08:54:03+00:00

Also use correct function name spelling (stub_segv_handler) for better grepping Signed-off-by: Thomas Meyer Signed-off-by: Richard Weinberger

um: userspace - be more verbose in ptrace set regs error

2017-07-07T08:37:42+00:00

When ptrace fails to set GP/FP regs for the target process, log the error before crashing the UML kernel. Signed-off-by: Thomas Meyer Signed-off-by: Richard Weinberger

um: Add missing NR_CPUS include

2017-05-04T06:15:10+00:00

We need linux/threads.h for that variable. Fixes: 8bba077066d6d0 ("um: Set number of CPUs") Signed-off-by: Richard Weinberger

um: Set number of CPUs

2017-05-03T20:33:52+00:00

Define NR_CPUS required by the timer subsystem. Fixes this make warning: scripts/kconfig/conf --oldconfig arch/x86/um/Kconfig kernel/time/Kconfig:155:warning: range is invalid Signed-off-by: Nikola Kotur Signed-off-by: Richard Weinberger

um: Fix ptrace GETREGS/SETREGS bugs

2016-01-10T20:49:48+00:00

This fix two related bugs: * PTRACE_GETREGS doesn't get the right orig_ax (syscall) value * PTRACE_SETREGS can't set the orig_ax value (erased by initial value) Get rid of the now useless and error-prone get_syscall(). Fix inconsistent behavior in the ptrace implementation for i386 when updating orig_eax automatically update the syscall number as well. This is now updated in handle_syscall(). Signed-off-by: Mickaël Salaün Cc: Jeff Dike Cc: Richard Weinberger Cc: Thomas Gleixner Cc: Kees Cook Cc: Andy Lutomirski Cc: Will Drewry Cc: Thomas Meyer Cc: Nicolas Iooss Cc: Anton Ivanov Cc: Meredydd Luff Cc: David Drysdale Signed-off-by: Richard Weinberger Acked-by: Kees Cook

um: Switch clocksource to hrtimers

2015-11-06T21:54:49+00:00

UML is using an obsolete itimer call for all timers and "polls" for kernel space timer firing in its userspace portion resulting in a long list of bugs and incorrect behaviour(s). It also uses ITIMER_VIRTUAL for its timer which results in the timer being dependent on it running and the cpu load. This patch fixes this by moving to posix high resolution timers firing off CLOCK_MONOTONIC and relaying the timer correctly to the UML userspace. Fixes: - crashes when hosts suspends/resumes - broken userspace timers - effecive ~40Hz instead of what they should be. Note - this modifies skas behavior by no longer setting an itimer per clone(). Timer events are relayed instead. - kernel network packet scheduling disciplines - tcp behaviour especially under load - various timer related corner cases Finally, overall responsiveness of userspace is better. Signed-off-by: Thomas Meyer Signed-off-by: Anton Ivanov [rw: massaged commit message] Signed-off-by: Richard Weinberger

um: Store syscall number after syscall_trace_enter()

2015-11-06T21:49:09+00:00

To support changing syscall numbers we have to store it after syscall_trace_enter(). Signed-off-by: Richard Weinberger

um/os-Linux: Use char[] for syscall_stub declarations

2015-05-31T11:14:07+00:00

When declaring __syscall_stub_start, use the same type in UML userspace code as in arch/um/include/asm/sections.h. While at it, also declare batch_syscall_stub as char[]. Signed-off-by: Nicolas Iooss Signed-off-by: Richard Weinberger

um: Move uml_postsetup in the init_thread stack

2015-04-13T19:17:44+00:00

atomic_notifier_chain_register() and uml_postsetup() do call kernel code that rely on the "current" kernel macro and a valid task_struct resp. thread_info struct. Give those functions a valid stack by moving uml_postsetup() in the init_thread stack. This moves enables a panic() call in this early code to generate a valid stacktrace, instead of crashing. E.g. when an UML kernel is started with an initrd but too few physical memory the panic() call get's actually processed. Signed-off-by: Thomas Meyer Signed-off-by: Richard Weinberger