Before commit 202b2ccc,
cpu::reschedule_from_interrupt() needed to know whether we were called
from an interrupt (preempt=true) or as an ordinary function (preempt=false),
to know whether or not to save the FPU state.

As we now save the FPU state at the interrupt code,
reschedule_from_interrupt() no longer needs to deal with this, and so this
patch removes the unneeded paramter "preempt" to that function.

One thing we are losing in this patch is the "sched_preempt" tracepoint,
which we previously had when an interrupt caused an actual context switch
(not just a reschedule call, but actually switching to a different thread).
We still have the "sched_switch" tracepoint which traces all the context
switches, which is probably more interesting anyway.

Signed-off-by: Nadav Har'El <nyh@cloudius-systems.com>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>

Signed-off-by: Gleb Natapov <gleb@cloudius-systems.com>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>

bsd/sys/net/if_ethersubr.cc has an assert to check if
incoming frame is a VLAN frame, if so kernel will abort
there, just dropping it may be a bettter choice.

Signed-off-by: Li Yu <raise.sail@gmail.com>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>

Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

The "user.home" JVM system property, for example, uses getpwuid() so
make sure it's returning proper values.

Reviewed-by: Nadav Har'El <nyh@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Move getpwuid() and getpwuid_r() to libc/user.cc where OSv user is
defined.

Reviewed-by: Nadav Har'El <nyh@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Waitqueues fullfil the same role as condition variables, but are much lighter
since they rely on an external mutex, which is already provided by rwlock.

Replacing condvars by waitqueues significantly reduces the size of an rwlock,
and in addition reduces the number of atomic operations in contended cases
significantly.

Reviewed-by: Nadav Har'El <nyh@cloudius-systems.com>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>

Fix madvice(MADV_DONTNEED) to use correct page ops for a VMA. Don't try
to use what we have today on mmaped files.

Signed-off-by: Gleb Natapov <gleb@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

This separates Capstan and VM image building into two scripts. This is
needed to be able to drop useless VM images like "osv-base" or
"osv-openjdk" that only make sense as Capstan base images, not
standalone VM images that people boot to.

Cc: Tzach Livyatan <tzach@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Signed-off-by: Raphael S. Carvalho <raphaelsc@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Reviewed-by: Tomasz Grabiec <tgrabiec@gmail.com>
Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Reviewed-by: Tomasz Grabiec <tgrabiec@gmail.com>
Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Reviewed-by: Tomasz Grabiec <tgrabiec@gmail.com>
Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Reviewed-by: Tomasz Grabiec <tgrabiec@gmail.com>
Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

This is needed to run iperf3.

https://github.com/cloudius-systems/osv/issues/305



Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Avoid using X.509 keypair because it became deprecated
and not generally available to person doing release.

Signed-off-by: Dmitry Fleytman <dmitry@daynix.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

This reverts commit f9311884.  The fpu
vulnerabilities have been fixed (202b2ccc, d9addd0b), so fpu-based memcpy
should work now.

Signed-off-by: Avi Kivity <avi@cloudius-systems.com>

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

getpeername() is required by iperf in client mode

without it iperf crashes as following:

[/]% run /tools/iperf.so -c 10.0.0.144
Failed looking up symbol getpeername

[backtrace]
0x00000000003326a2 <elf::object::resolve_pltgot(unsigned int)+82>
0x0000000000369b42 <__elf_resolve_pltgot+46>
0x0000100004207535 <Client::Client(thread_Settings*)+301>
0x0000100004208b44 <client_spawn+50>
0x000010000421323a <thread_stop+272>
0x0000000000412ca5 <sync+69>
0x00000000003b2eea <thread_main_c+26>
0x000000000036ae95 <thread_main+7>

Signed-off-by: Dmitry Fleytman <dmitry@daynix.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

try_xmit_one_locked(net_req*) doesn't return EINVAL anymore. The appropriate
code has moved to xmit_prep().

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Implement facades for rwlock so it can be used with WITH_LOCK, specifying
whether we want a read lock or a write lock:

  rwlock my_rwlock;

  WITH_LOCK(my_rwlock.for_read()) {
    read stuff
  }

  WITH_LOCK(my_rwlock.for_write()) {
    write stuff
  }

Signed-off-by: Avi Kivity <avi@cloudius-systems.com>

elf_resolve_pltgot() can be called from anywhere, including with dirty fpu
state.  Ensure the fpu is not clobbered during its execution.

Signed-off-by: Avi Kivity <avi@cloudius-systems.com>

Since we cannot guarantee that the fpu will not be used in interrupts and
exceptions, we must save it earlier rather than later.

This was discovered with an fpu-based memcpy, but can be triggered in other
ways.

Signed-off-by: Avi Kivity <avi@cloudius-systems.com>

The summary will only include samples within the specified range.
Timed samples will be trimmed to the given time range.

Requested-by: Glauber Costa <glommer@cloudius-systems.com>
Signed-off-by: Tomasz Grabiec <tgrabiec@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

When using 'zpool.so import' fdopendir symbol is missed.
Code taken from musl libc.

Additional details:
fcntl(fd, F_SETFD, FD_CLOEXEC) call was removed as the close-on-exec
flag is left unchanged on Linux (Glauber Costa).
Also removing struct __DIR_s definition from fs/vfs/main.c, and
referencing the new one added into libc/dirent/dirent.h.

Reviewed-by: Glauber Costa <glommer@cloudius-systems.com>
Signed-off-by: Raphael S. Carvalho <raphaelsc@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

The code in <api/x86/reloc.h> is not used. Avi says it's dead code that
originates fro Musl.

Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>

"Nothing spectacular here, just making msync() pagecache aware. Reduces
code size a bit if nothing else"

Signed-off-by: Avi Kivity <avi@cloudius-systems.com>

R_X86_64_DPTMOD64 may not be associated with any symbol (which is common
when the linker uses local dynamic TLS mode) in which case it should be
resovled to the index of the current module.

Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>

Not all pages in the write page cache are dirty sync msync() may write
some of them back. Check for that and do not write back clean pages
needlessly.

Signed-off-by: Gleb Natapov <gleb@cloudius-systems.com>

This will allow pagecache code to atomically clear pte and
check for a dirty bit.

Signed-off-by: Gleb Natapov <gleb@cloudius-systems.com>

Current msync implementation is scanning all pages in msync are via
pagetables to find dirty pages, but pagecache already knows what pages are
potentially dirty for given file/offsets, so it is can check if they are
dirty via rmap.

Signed-off-by: Gleb Natapov <gleb@cloudius-systems.com>

As Avi pointed ptep_flush and ptep_accessed classes can be replaced by
general map-reduce mechanism with customizable map and reduce functions.
The patch implements that.

Signed-off-by: Gleb Natapov <gleb@cloudius-systems.com>

The problem was the flag D_TTY, meaning that device is TTY, not
being passed to device_create.

Signed-off-by: Raphael S. Carvalho <raphaelsc@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

This reverts commit 2da050a4 - apparently
we're calling memcpy() in a non-safe path.

Revert for now.

Signed-off-by: Avi Kivity <avi@cloudius-systems.com>

Fix a missing include to allow tst-mmap.cc to be compiled on Linux, and
add in a comment the (far from obvious) command line needed to compile it.

Signed-off-by: Nadav Har'El <nyh@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

The man page for raise says:

In a single-threaded program it is equivalent to

           kill(getpid(), sig);

In a multithreaded program it is equivalent to

           pthread_kill(pthread_self(), sig);

In our case we should mimic the second. It is a good question then whether this
function should be in a more generic place or in pthread.cc itself, but I will
argue for the second, since it will make it easier for people to notice that
this is what our implementation does.

Of course at this moment pthread_kill is stubbed and so is raise. But if we
ever implement the first, we gain the later for free.

Signed-off-by: Glauber Costa <glommer@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Code from musl.

Signed-off-by: Glauber Costa <glommer@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

We already have the ffs function, ffsl and ffsll are easy from here.
Theoretically, a_ctz_l should do the job here as well since we're 64 all
over, but I found a_ctz_64 safer.

Signed-off-by: Glauber Costa <glommer@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>