kernel/arch/um/include/shared/os.h, branch linux-5.1.y

um: Add support for DISCARD in the UBD Driver

2018-12-27T21:48:20Z

Support for DISCARD and WRITE_ZEROES in the ubd driver using fallocate. DISCARD is enabled by default and can be disabled using a new UBD command line flag. If the underlying fs on which the UBD image is stored does not support DISCARD the support for both DISCARD and WRITE_ZEROES is turned off. Signed-off-by: Anton Ivanov Signed-off-by: Richard Weinberger

Epoll based IRQ controller

2018-02-19T18:38:51Z

1. Removes the need to walk the IRQ/Device list to determine who triggered the IRQ. 2. Improves scalability (up to several times performance improvement for cases with 10s of devices). 3. Improves UML baseline IO performance for one disk + one NIC use case by up to 10%. 4. Introduces write poll triggered IRQs. 5. Prerequisite for introducing high performance mmesg family of functions in network IO. 6. Fixes RNG shutdown which was leaking a file descriptor Signed-off-by: Anton Ivanov Signed-off-by: Richard Weinberger

um: Fix FP register size for XSTATE/XSAVE

2017-09-13T20:24:38Z

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 os_warn() for pre-boot warning/error messages

2017-07-05T21:18:02Z

Add os_warn() for printing out pre-boot warning/error messages in stderr. The messages via os_warn() are not suppressed by quiet option. Signed-off-by: Masami Hiramatsu Signed-off-by: Richard Weinberger

um: Add os_info() for pre-boot information messages

2017-07-05T21:17:16Z

Add os_info() for printing out pre-boot information level messages in stderr. The messages via os_info() are suppressed by "quiet" kernel command line. Signed-off-by: Masami Hiramatsu Signed-off-by: Richard Weinberger

x86/arch_prctl/64: Rename do_arch_prctl() to do_arch_prctl_64()

2017-03-20T15:10:32Z

In order to introduce new arch_prctls that are not 64 bit only, rename the existing 64 bit implementation to do_arch_prctl_64(). Also rename the second argument of that function from 'addr' to 'arg2', because it will no longer always be an address. Signed-off-by: Kyle Huey Reviewed-by: Andy Lutomirski Cc: Grzegorz Andrejczuk Cc: kvm@vger.kernel.org Cc: Radim Krčmář Cc: Peter Zijlstra Cc: Dave Hansen Cc: Andi Kleen Cc: linux-kselftest@vger.kernel.org Cc: Nadav Amit Cc: Robert O'Callahan Cc: Richard Weinberger Cc: "Rafael J. Wysocki" Cc: Borislav Petkov Cc: Len Brown Cc: Shuah Khan Cc: user-mode-linux-devel@lists.sourceforge.net Cc: Jeff Dike Cc: Alexander Viro Cc: user-mode-linux-user@lists.sourceforge.net Cc: David Matlack Cc: Boris Ostrovsky Cc: Dmitry Safonov Cc: linux-fsdevel@vger.kernel.org Cc: Paolo Bonzini Link: http://lkml.kernel.org/r/20170320081628.18952-5-khuey@kylehuey.com Signed-off-by: Thomas Gleixner

x86/arch_prctl: Rename 'code' argument to 'option'

2017-03-20T15:10:32Z

The x86 specific arch_prctl() arbitrarily changed prctl's 'option' to 'code'. Before adding new options, rename it. Signed-off-by: Kyle Huey Cc: Grzegorz Andrejczuk Cc: kvm@vger.kernel.org Cc: Radim Krčmář Cc: Peter Zijlstra Cc: Dave Hansen Cc: Andi Kleen Cc: linux-kselftest@vger.kernel.org Cc: Nadav Amit Cc: Robert O'Callahan Cc: Richard Weinberger Cc: "Rafael J. Wysocki" Cc: Borislav Petkov Cc: Andy Lutomirski Cc: Len Brown Cc: Shuah Khan Cc: user-mode-linux-devel@lists.sourceforge.net Cc: Jeff Dike Cc: Alexander Viro Cc: user-mode-linux-user@lists.sourceforge.net Cc: David Matlack Cc: Boris Ostrovsky Cc: Dmitry Safonov Cc: linux-fsdevel@vger.kernel.org Cc: Paolo Bonzini Link: http://lkml.kernel.org/r/20170320081628.18952-3-khuey@kylehuey.com Signed-off-by: Thomas Gleixner

um: Fix ptrace GETREGS/SETREGS bugs

2016-01-10T20:49:48Z

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: Update UBD to use pread/pwrite family of functions

2016-01-10T20:49:48Z

This decreases the number of syscalls per read/write by half. Signed-off-by: Anton Ivanov Signed-off-by: Richard Weinberger

um: Switch clocksource to hrtimers

2015-11-06T21:54:49Z

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