When the cycle counter is "stable", i.e., synchronized across vCPUs by
the hypervisor, userspace can use a serialized rdtsc instead of relying
on rdtscp, just like the kernel timecounter does. This can be useful
for performance in guests where the hypervisor hides rdtscp for some
reason.
To avoid breaking compatibility with older userspace which expects
rdtscp to be usable when pvclock exports timekeeping info, hide this
feature behind a sysctl.
Reviewed by: kib
Tested by: Shrikanth R Kamath <kshrikanth@juniper.net>
MFC after: 2 weeks
Sponsored by: Klara, Inc.
Sponsored by: Juniper Networks, Inc.
Differential Revision: https://reviews.freebsd.org/D38342
Summary:
Migrate linprocfs to use the IfAPI interfaces instead of direct ifnet
accesses.
Reviewed by: dchagin
Sponsored by: Juniper Networks, Inc.
Differential Revision: https://reviews.freebsd.org/D38358
Summary:
Sometimes it's useful to iterate over all interfaces in the current
VNET, as the linuxulator does in several places.
Unlike other iterators in the IfAPI this propagates any error received
up to the caller, instead of returning a count.
Sponsored by: Juniper Networks, Inc.
Reviewed by: glebius, melifaro
Differential Revision: https://reviews.freebsd.org/D38348
mountd(8) basically does the following:
getmntinfo()
for each mount
delete_exports
using nmount(2) to do the creation/deletion of individual exports.
For prison0 (and for other prisons if enforce_statfs == 0) getmntinfo()
returns all mount points, including ones being used within other prisons.
This can cause confusion if the same file system is specified in the
exports(5) file for multiple prisons.
This patch adds a perminent identifier to each prison
and marks which prison did the exports in a field of
the mount structure called mnt_exjail. This field can
then be compared to the perminent identifier for the
prison that the thread's credentials is in.
Also required was a new function called prison_isalive_permid()
which returns if the prison is alive, so that the check can be
ignored for prisons that have been removed.
This prepares the system to allow mountd(8) to run in multiple
prisons, including prison0.
Future commits will complete the modifications to allow mountd(8)
to run in vnet prisons. Until then, these changes should not affect
semantics.
Reviewed by: markj
MFC after: 3 months
Differential Revision: https://reviews.freebsd.org/D38144
Under the scenario with a packet with length of 67 bytes, a header length
using the default of 20 bytes and a TCP data offset (th_off) of 48 will
cause m_pullup() to fail to make sure bytes are arragned contiguously.
m_pullup() will free the mbuf chain and return a null. ipfilter stores
the resultant mbuf address (or the resulting NULL) in its fr_info_t
structure. Unfortuntely the eroneous packet is not flagged for drop.
This results in a kernel page fault at line 410 of sys/netinet/ip_fastfwd.c
as it tries to use a now previously freed, by m_pullup(), mbuf.
PR: 266442
Reported by: Robert Morris <rtm@lcs.mit.edu>
MFC after: 1 week
When handling userspace exceptions on arm64 we need to dereference the
current thread pointer. If this is being promoted/demoted there is a
small window where it will cause another exception to be hit. As this
second exception will set the fault address register we will read the
incorrect value in the userspace exception handler.
Fix this be always reading the fault address before dereferencing the
current thread pointer.
Reported by: olivier@
Reviewed by: markj
Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D38196
Only disable the Arm generic timer on arm64 when entering the kernel
through EL2. There is no guarantee it will be enabled if we are running
under a hypervisor.
Sponsored by: Arm Ltd
Before adding the ITS interrupt controller driver to handle MSI/MSI-X
interrupts check if it is present in the IO Remapping Table (IORT).
If not don't attach as devices expect to use this table to find the
correct MSI interrupt controller.
Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D37772
NIC input errors have traditionally indicated problems at the link
level (crc errors, runts, etc). People tend to build monitoring
infrastructure around such errors in order to monitor for bad network
hardware. When L3/L4 checksum errors are included in the category of
input errors, it breaks such monitoring, as these errors can originate
anywhere on the internet, and do not necessarily indicate faulty
local network hardware.
Reviewed by: erj, glebius
Differential Revision: https://reviews.freebsd.org/D38346
Sponsored by: Netflix
Use native routines to fixup initial process stack. On Arm64 linux_elf_fixup() is
noop, as it do the stack fixup (room for argc) in the linux_copyout_strings().
MFC after: 1 week
COMPAT_LINUX32 option is defined for case when building 32-bit Linuxulator
for the 64-bit host. Usage of __ELF_WORD_SIZE is wrong here as it is equal to 32
on i386 too.
MFC after: 1 week
It has been pointed out, that this change causes ABI breakage for
[GP]IO_DEADKEYMAP. I'll create a review on phabricator.
Since the 8 bit limit on keycodes causes issues for certain keymaps,
a fix should be committed in time to allow a MFC to 13.2.
This reverts commit 1e0853ee84.
Reported by: Jessica Clarke
Exposing the a power loss of the rtc as an sysctl makes it easier to
detect an empty cmos battery.
Reviewed by: manu
MFC after: 1 week
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D38325
Since mountd(8) will not be able to do exports
when running in a vnet prison if enforce_statfs is
set to 0, add a check for this to prison_check_nfsd().
Reviewed by: jamie, markj
MFC after: 2 months
Differential Revision: https://reviews.freebsd.org/D38189
Jumping direct to ret was not restoring the saved value of x19 and was
also not adjusting sp to discard the two saved registers.
Reviewed by: andrew
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D37922
This somewhat undermines the initial goal of sousrsend() to have all
the special error handling for a write on a socket in a single place.
The aio(4) needs to see EWOULDBLOCK to re-schedule the job. Because
aio(4) handles return from soreceive() and sousrsend() with the same
code, we can't check for (error == 0 && done < job_nbytes). Keeping
this exclusion for aio(4) seems a lesser evil.
Fixes: 7a2c93b86e
This patch does remaining enablement in hyperv vpci driver to work
on arm64 Hyper-V. For that it required to use PCI protocol 1.4 and
corresponding different PCI message handling. Also new MSI allocation,
MSI-X mapping, release.
This is the last patch of total three patches to enalbe Hyper-V vPCI
support in arm64.
Reviewed by: whu
Tested by: Souradeep Chakrabarti <schakrabarti@microsoft.com>
Obtained from: Souradeep Chakrabarti <schakrabarti@microsoft.com>
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D37958
Some keyboard definitions return Unicode characters that cannot be
represented in the 8 bits provided by an u_char.
Extend then width of the keycode entries to 16 bits to allow for all
keycodes currently defined in share/vt/keymaps/*,kbd.
Reported by: yuri@aetern.org
MFC after: 3 days
This is enabling the PCI protocol 1.4 and corresponding structures
in order to support arm64 Hyper-V.
This is the 2nd of the three patches to enable Hyper-V vPCI support
in arm64.
Reviewed by: whu
Tested by: Souradeep Chakrabarti <schakrabarti@microsoft.com>
Obtained from: Souradeep Chakrabarti <schakrabarti@microsoft.com>
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D37780
Microsoft Azure Hyper-V uses SPI to map MSI in ARM64, instead of
using LPI IDS. To enable that we need to have gic registered with
ACPI_MSI_XREF and gic acpi to map SPI for MSI.
This is the 1st of the three patchs to enable Hyper-V vPCI support
in arm64.
Reviewed by: andrew, emaste, whu
Tested by: Souradeep Chakrabarti <schakrabarti@microsoft.com>
Obtained from: Souradeep Chakrabarti <schakrabarti@microsoft.com>
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D37763
