The hold_count and wire_count fields of struct vm_page are separate
reference counters with similar semantics. The remaining essential
differences are that holds are not counted as a reference with respect
to LRU, and holds have an implicit free-on-last unhold semantic whereas
vm_page_unwire() callers must explicitly determine whether to free the
page once the last reference to the page is released.
This change removes the KPIs which directly manipulate hold_count.
Functions such as vm_fault_quick_hold_pages() now return wired pages
instead. Since r328977 the overhead of maintaining LRU for wired pages
is lower, and in many cases vm_fault_quick_hold_pages() callers would
swap holds for wirings on the returned pages anyway, so with this change
we remove a number of page lock acquisitions.
No functional change is intended. __FreeBSD_version is bumped.
Reviewed by: alc, kib
Discussed with: jeff
Discussed with: jhb, np (cxgbe)
Tested by: pho (previous version)
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D19247
table VCTRL registers.
Unconditionally program the MSI-X vector control Mask field for MSI-X
table entries without regarud for Mask's previous value. Some devices
return all zeros on reads of the VCTRL registers, which would cause us
to skip disabling interrupts. This fixes the Samsung SM961/PM961 SSDs
which are return zero starting from offset 0x3084 within the memory
region specified by BAR0, even when they are active MSI-X vectors.
The Illumos kernel writes these unconditionally to 0 or 1. However,
section 6.8.2.9 of the PCI Local Bus 3.0 spec (dated Feb 3, 2004)
states for bits 31::01:
After reset, the state of these bits must be 0. However, for
potential future use, software must preserve the value of
these reserved bits when modifying the value of other Vector
Control bits. If software modifies the value of these reserved
bits, the result is undefined."
so we always set or clear the Mask bit, but otherwise preserves the
old value.
PR: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211713
Reviewed By: imp, jhb
Submitted by: Ka Ho Ng
MFC After: 1 week
Differential Revision: https://reviews.freebsd.org/D20873
While at it fix an invalid memory access issue when attaching external
USB HUBs, which are not mapped by ACPI, due to missing status check
when calling AcpiGetObjectInfo() from acpi_usb_hub_port_probe_cb().
Sponsored by: Mellanox Technologies
Pages with PG_PCPU_CACHE set cannot have been allocated from a
reservation, so as an optimization, skip the call to
vm_reserv_free_page() in this case. Otherwise, the access of
the corresponding reservation structure often results in a cache
miss.
Reviewed by: alc, kib
Discussed with: jeff
MFC after: 2 weeks
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D20859
Some workloads benefit from having a per-CPU cache for
VM_FREEPOOL_DIRECT pages.
Reviewed by: dougm, kib
Discussed with: alc, jeff
MFC after: 2 weeks
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D20858
When the system has no graphical console, such as bhyve in common
configurations, ignore kern.vt.splash_cpu, instead of panicking
on INVARIANTS kernels.
Reviewed by: cem dumbbell
MFC after: 1 week
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D20877
Although PPC SLB code doesn't handle allocation failures,
which are rare, in most places it asserts that the pointer
returned by uma_zalloc() is not NULL, making it easier to
identify the failure and avoiding an invalid pointer dereference.
This change simply adds a missing KASSERT in SLB code.
In 2011, r218961 removed local code for rotating logs in favor of using the
rotate_log command in etc/rc.d/accounting. If the accounting service is
activated then subsequently de-activated in rc.conf but still remains active
in periodic.conf, then you get an error message every day in the periodic
jobs about being unable to rotate the logs.
With this change to use "onerotate_log", the log rotation will happen the
first time periodic daily runs after accounting was disabled but periodic
accounting was left enabled. After that happens once, the /var/account/acct
will no longer exist, which results in a different path through the periodic
code and no more error messages will appear (unless daily_show_badconfig is
set, in which case the admin will be told that periodic security processing
is enabled but the accounting file is not present).
This is only a partial fix for the problems reported in PR 202203.
PR: 202203
Bhyve can currently emulate two virtual NICs, namely virtio-net and e1000,
and connect to the host network through two backends, namely tap and netmap.
However, there is no interface between virtual NIC functionalities and
backend functionalities. As a result, the backend code is duplicated between
the two virtual NIC implementations and also within the same virtual NIC.
Also, e1000 cannot currently use netmap as a backend.
This patch introduces a network backend API between virtio-net/e1000 and
tap/netmap, to improve code reuse and add missing functionalities.
Virtual NICs and backends can negotiate virtio-net features, such as checksum
offload and TSO. If the backend supports the features, it will propagate this
information to the guest, so that the latter can make use of them. Currently,
only netmap VALE ports support the features, but support should be added to
tap in the future.
Reviewed by: jhb, bryanv
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D20659
These fields will not be equal only in case if bigalloc filesystem feature is turned on.
This feature is not supported for now.
Reported by: Christopher Krah, Thomas Barabosch, and Jan-Niclas Hilgert of Fraunhofer FKIE
Reported as: FS-27-EXT2-12: Denial of Service in openat-0 (vm_fault_hold/ext2_clusteracct)
MFC after: 2 weeks
The ext2fs fragments are different from ufs fragments.
In case of ext2fs the fragment should be equal or more then block size.
The values more than block size are used only in case of bigalloc feature, which is does not supported for now.
Reported by: Christopher Krah, Thomas Barabosch, and Jan-Niclas Hilgert of Fraunhofer FKIE
Reported as: FS-22-EXT2-9: Denial of service in ftruncate-0 (ext2_balloc)
MFC after: 2 weeks
Reported by: Christopher Krah, Thomas Barabosch, and Jan-Niclas Hilgert of Fraunhofer FKIE
Reported as: FS-11-EXT2-6: Denial Of Service in write-1 (ext2_balloc)
MFC after: 2 weeks
comment. Rewrite that comment to improve its clarity.
Reported by: cem
Reviewed by: alc, cem
Approved by: kib, markj (mentors, implicit)
Differential Revision: https://reviews.freebsd.org/D20871
1. Use _pmap_alloc_l3() instead of pmap_alloc_l3() in order to handle the
possibility that a superpage mapping for "va" was created while we slept.
(This is derived from the amd64 version.)
2. Eliminate code for allocating kernel page table pages. Kernel page
table pages are preallocated by pmap_growkernel().
3. Eliminate duplicated unlock operations when KERN_RESOURCE_SHORTAGE is
returned.
MFC after: 2 weeks
Take part of the text from POSIX 2018 edition and describe the
atomicity requirements for read and write syscalls. See p1003.1-2018,
Vol.2, 2.9.7 Threads interaction with Regular File Operations.
Reviewed by: asomers
Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Differential revision: https://reviews.freebsd.org/D20867
libunwind and openmp to the upstream release_80 branch r364487
(effectively, 8.0.1 rc3). The 8.0.1 release will most likely
have no further changes.
MFC after: 1 week
X-MFC-With: r349004
after the one where the possible block allocation begins, and allocate
a larger number of blocks than the current limit. This does not affect
the limit on minimum allocation size, which still cannot exceed
BLIST_MAX_ALLOC.
Use this change to modify swp_pager_getswapspace and its callers, so
that they can allocate more than BLIST_MAX_ALLOC blocks if they are
available.
Tested by: pho
Approved by: markj (mentor)
Differential Revision: https://reviews.freebsd.org/D20579
restructure cache_handle_range so that all of the data cache operations are
performed before any instruction cache operations. Then, we only need one
barrier between the data and instruction cache operations and one barrier
after the instruction cache operations.
On an Amazon EC2 a1.2xlarge instance, this simple change reduces the time
for a "make -j8 buildworld" by 9%.
Reviewed by: andrew
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D20848
swap_pager_swapoff_object and swp_pager_force_pagein so that they can
page in multiple pages at a time to a swap device, rather than doing
one I/O operation for each page.
Tested by: pho
Submitted by: ota_j.email.ne.jp (Yoshihiro Ota)
Reviewed by: alc, markj, kib
Approved by: kib, markj (mentors)
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D20635
vm_page_dirty() when, in fact, we are write protecting the page and the L3
entry has PTE_D set. However, pmap_protect() was always calling
vm_page_dirty() when an L2 entry has PTE_D set. Handle L2 entries the
same as L3 entries so that we won't perform unnecessary calls to
vm_page_dirty().
Simplify the loop calling vm_page_dirty() on L2 entries.
Print the adapter name rather than the address of the adapter
to avoid kernel address leakage.
PR: Bug 238642
Submitted by: Fuqian Huang <huangfq.daxian@gmail.com>
Reviewed by: vmaffione
MFC after: 1 week
New system calls between 2.6.32 and 2.6.26 are already implemented.
This should be mostly NFC as far as contemporary Linux applications are
concerned though, as Linux kernel 3.2 is the oldest supported by a
number of popular distros today; work is in progress by others to enable
support for those applications.
Discussed with: trasz
MFC after: 1 month
Linux man(1) calls it for no good reason; this avoids the console spam
(eg '(man): ioctl fd=4, cmd=0x660b ('f',11) is not implemented').
Reviewed by: emaste
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D20690
in some cases (strace -f man id > /dev/null).
Reviewed by: dchagin
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D20691
return something reasonable, and helps linux binaries which attempt
to close all the files, eg apt(8).
Reviewed by: emaste
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D20692
We were otherwise failing to call funsetown() for some descriptors
associated with a tty, such as pts descriptors. Then, if the
descriptor is closed before the owner exits, we may get memory
corruption.
Reported by: syzbot+c9b6206303bf47bac87e@syzkaller.appspotmail.com
Reviewed by: ed
MFC after: 3 days
Sponsored by: The FreeBSD Foundation
Otherwise a future call to elf_errno() will return a non-zero value.
update_shdr(), for example, treats any errors associated with the ELF
descriptor as fatal. Clear the error per the first example in
elf_errmsg.3.
Convert to elf_getshdrstrndx() while here since elf_getshstrndx() is
apparently deprecated.
Reported by: royger
Reviewed by: emaste
MFC after: 3 days
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D20852
All MMCBR bridges have to implement all the MMCBR variables. This
implements them for everybody that currently doesn't.
A common routine for this should be written.
XCHAN_CAP_BOUNCE.
The only application that uses bounce buffering for now is the Government
Furnished Equipment (GFE) P2's dma core (AXIDMA) with its own dedicated
cacheless bounce buffer.
Sponsored by: DARPA, AFRL
There was an issue in pseries llan driver, that resulted in the first 2 bytes
of the MAC address getting stripped, and the last 2 being always 0.
In most cases the network interface still worked, despite the MAC being
different of what was specified to QEMU, but when some other host or DHCP
server expected a specific MAC, this would fail.
This change fixes this by shifting right by 2 the local-mac-address read from
device tree, if its length is 6 instead of 8, as observed in QEMU DT, that
always presents a 6 bytes value for this property.
PR: 237471
Reported by: Alfredo Dal'Ava Junior
Reviewed by: jhibbits
Differential Revision: https://reviews.freebsd.org/D20843
Otherwise there is a window where they may be rescheduled. This
typically manifested as a page fault shortly after unloading if_iwm.ko.
Close the race by draining callouts after calling iwm_stop_device(),
which is also what Dragonfly does.
Change whitespace to reduce gratuitous diffs with Dragonfly.
Reported and tested by: seanc
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
