elf: unload _used_by_resolve_plt_got on object removal

Like _needed, _used_by_resolve_plt_got should be cleared as well
when the underlying object is being removed.

Signed-off-by: Raphael S. Carvalho <raphaelsc@cloudius-systems.com>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>
runtime: make abort and __assert_fail callable early

backtrace functionality uses ELF functions which acquire lockfree
mutex locks, and they require threads to be initialized as in
(s_current != nullptr), as well as the ELF program to be
contructed (s_program != NULL).

abort used to print with debug_ll, but in the meantime debug_ll
changed in semantics due to the console framework changes.

Therefore we need to use debug_early to ensure that the message
ends up in the console at any time of call, in any condition.

This patch makes abort() and assert() callable even before
the full construction of the init array in premain and before
TLS is available.

Signed-off-by: Claudio Fontana <claudio.fontana@huawei.com>
Cc: Nadav Har'El <nyh@cloudius-systems.com>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>
tests: add test for presence of 'osv.version' property

This feature was introduced in commit 7bd655ab918eb5cd0bf9f690bfe32066acd6c5f9

Signed-off-by: Tomasz Grabiec <tgrabiec@cloudius-systems.com>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>
java: isolated contexts should not inherit system properties

Context started from another context should not inherit system
properties because they may interfere with its state badly. For
example inheriting of logging properties may result in
ClassNotFoundException:s in the child because the classes present in
parent context are not found in the child context.

The initial system properties set by JRE should be available though.

Signed-off-by: Tomasz Grabiec <tgrabiec@cloudius-systems.com>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>
zfs: Implement zfs_ioctl

The function zfs_ioctl was ported from FreeBSD code.

OSv port details:
1) Copyright was properly updated.
2) Added missing header bsd/sys/sys/filio.h from FreeBSD.
3) Solved conflicts.

Later on, lseek should be modified to take advantage of
this change, and add support for finding holes and data.

Signed-off-by: Raphael S. Carvalho <raphaelsc@cloudius-systems.com>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>
virtio::net: Don't use indirect buffers

This improve TCP Tx performance by about 10%.

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>
virtio-net:txq: Don't caclucate the sg length

Don't caclucate the sg length, use vqueue->_sg_vec.size() instead.

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