Marco Schlumpp [Fri, 28 Jun 2024 12:52:28 +0000 (14:52 +0200)]
.github: Remove CODEOWNERS
The goal of the CODEOWNERS file is to automatically assign PRs to the
responsible team. However, this notifies the full team instead of individual
persons and we manually assign specific persons anyway via a bot. After the
team was added as a review once, the notifications will be still sent even
after the team removal. This causes an immensive amount of noise and many
people disable notifications/mails entirely making it necessary to rely
on out-of-band channels to notify people of actual review requests.
Signed-off-by: Marco Schlumpp <marco@unikraft.io> Reviewed-by: Alexander Jung <alex@unikraft.io> Approved-by: Razvan Deaconescu <razvand@unikraft.io>
GitHub-Closes: #1468
Simon Kuenzer [Fri, 14 Jun 2024 22:29:06 +0000 (00:29 +0200)]
support/qemu-guest: Enable RDRAND, RDSEED for x86 TCG
QEMU's TCG for x86 can emulate `rdrand` and `rdseed` instructions as
long as specified via `-cpu` parameter and QEMU 8.1.3 or newer is used.
Due to recent requirements introduced with `lib/ukrandom` (see PR #1008,
PR #1451), we request `rdseed` and `rdrand` when using TCG.
Sergiu Moga [Thu, 6 Jun 2024 11:33:35 +0000 (14:33 +0300)]
plat/common: Fix wrong `vbase` of legacy video memory area
Commit a001e41f607c ("plat/common/x86: Increase legacy high regions granularity")
used the wrong value for the vbase, using by mistake the length of the
region instead of its start. Fix this.
Michalis Pappas [Wed, 5 Jun 2024 15:42:58 +0000 (17:42 +0200)]
lib/ukrandom: Add option to seed the CSPRNG with a fixed value
Add an option to seed the CSPRNG with a fixed value. This options is
intended for development purposes, or running Unikraft in legacy
systems that don't provide a TRNG.
Enabling this option compromises the system's security. The build
system will mark Unikraft as tainted and libukrandom will print a
banner during init.
Michalis Pappas [Wed, 5 Jun 2024 16:04:29 +0000 (18:04 +0200)]
lib/ukrandom: Use RDRAND to seed ChaCha
It has been observed that in some x86_64 systems the loop that initializes
the ChaCha seed fails after a few iterations due to exhaustion of the
conditioned entropy. In [1] Intel suggests that performance-crtical
systems may use RDRAND instead. Switch to ukarch_random_u32() to
mitigate this risk. In the future there should be a mechanism to allow
configuring the mechanism that controls this behavior, for systems that
favor security to performance.
There is no leftover space, but a memory region of negative size is
inserted. so check for the size of the negative region before doing any
insertions.
Sergiu Moga [Wed, 5 Jun 2024 14:12:34 +0000 (17:12 +0300)]
plat/common/x86: Increase legacy high regions granularity
Split the previously named `HI_MEM` region into two separate
regions:
- a region for display buffers for video adapters (e.g. VGA Text Mode)
- mapped PCI expansion ROMs regions
This is the new legacy high region expected layout:
Expected memory map for the first 1MiB w.r.t. PC-AT systems compatibility
0x00000 – 0x9FFFF 640KB Main memory, DOS compatible. May contain the
following memory subregions that we will not need after
boot. If the EBDA is defined here, then 1KB starting
at that address shall be treated as a reserved region
0x00000 - 0x003FF Legacy BIOS IVT, segmented pointers to software
interrupt routines defined in the ROM BIOS
0x0040E - 0x0040F Optional EBDA segmented pointer (part of BDA's
structure that occupies 40:00 -> 40:101 range)
0x9FC00 - 0xA0000 Default 1KB of EBDA if not defined in previous
region
0xA0000 – 0xBFFFF 128KB Display buffer for video adapters and possible
SMM Shadow Memory
0xC0000 – 0xDFFFF 128KB ROM BIOS for add-on cards (PCI XROMBARs)
0xE0000 – 0xFFFFF 128KB System ROM BIOS
NOTE: Some systems only report 0xF0000 - 0xFFFFF for the System ROM BIOS
and that is fine.
Note that we are assigning UKPLAT_MEMRT_RESERVED to BIOS PCI ROM.
We usually have here the routines used by real-mode
bootloaders invoked through the BIOS IVT. Although this may not be
necessary anymore, we cannot assign UKPLAT_MEMRT_FREE either since
some BIOSes do set this as a RO segment in the corresponding chipset
registers, leaving this potentially unusable. Thus, just treat it
as a memory hole.
NOTE: For compatibility with newer Firecracker versions (1.7.0+), if VGA
does not exist, we mark its region as READ-ONLY.
NOTE: Assertions for in-page offsets for such regions has also been
obsoleted to deal with regions like those of EBDA, that are not
page-aligned.
Sergiu Moga [Wed, 5 Jun 2024 08:36:20 +0000 (11:36 +0300)]
plat/kvm/x86: Ensure free memory regions' lengths are page aligned
All free memory regions must meet the following criteria:
mrd->len == mrd->pg_count * PAGE_SIZE. The `pg_count` field is
equal to the value of `PAGE_COUNT` (i.e. `DIV_ROUND_UP` of `PAGE_SIZE`)
of `len + pg_off`, however in theory this (times `PAGE_SIZE`) should be
equal to the `PAGE_ALIGN_UP` of the latter as well.
To catch cases where this may not happen (if possible), do this
differently: `PAGE_COUNT` for `pg_count` and `PAGE_ALIGN_UP` for `len`.
The lxboot boot code did not correctly compute `len` because of this,
so fix it.
Sergiu Moga [Wed, 5 Jun 2024 08:32:51 +0000 (11:32 +0300)]
plat/common: Ensure overlapping free regions length is page aligned
When a memory region descriptor of type free memory overlaps with
another, the former gets adjusted in favor of the former. However,
a condition all free memory regions must meet is that:
mrd->len == mrd->pg_count * PAGE_SIZE.
Ensure this is maintained after an overlapping fixup following a
coalescing operation.
Michalis Pappas [Tue, 4 Jun 2024 10:40:09 +0000 (12:40 +0200)]
plat/kvm: Enable HAVE_RANDOM
Enable HAVE_RANDOM on QEMU and Firecracker. This flag implies that
the platform provides a hardware RNG that libukrandom can rely on
to securely seed the CSPRNG.
This commit addresses the public API by renaming the main randomness
function uk_swrand_fill_buffer() to uk_random_fill_buffer(), to abide
Unikraft's naming convention.
As a result, the private hwrng function fill_buffer() is renamed to
uk_random_hwrng_fill_buffer().
uk_random_fill_buffer() is the result of a PRNG and it never fails.
Make it void to reflect this.
Alex Apostolescu [Fri, 31 May 2024 04:37:02 +0000 (07:37 +0300)]
lib/ukrandom: Clean ChaCha20 implementation
This commit covers the esthetical issues of the chacha implementation.
It replaces size_t and ssize_t with __sz and __ssz, and it removes the
leading underscore from functions name as it does not abide to
Unikraft's current convention.
Alex Apostolescu [Thu, 30 May 2024 20:44:17 +0000 (23:44 +0300)]
lib/ukrandom: Register /dev/hwrng
This commit introduces a new device node, /dev/hwrng, that provides
pass-through access to hardware randomness.
Hardware randomness will be available for the kernel API once
ukarch_random is implemneted as a driver. For the time being, restrict
the use of hardware randomness to /dev/hwrng.
Alex Apostolescu [Thu, 30 May 2024 15:41:28 +0000 (18:41 +0300)]
lib/ukrandom: Deprecate MWC
Deprecate multiply-with-carry (MWC) PRNG because it is not
cryptographycally secure.
Remove the choice for an algorithm in Config.uk as ChaCha20 is the only
supported algorithm.
Alex Apostolescu [Thu, 30 May 2024 14:48:16 +0000 (17:48 +0300)]
lib/ukrandom: Rename ukswrand to ukrandom
This commit renames ukswrand library to ukrandom to better describe its
use case. This library will provide cryptographically secure random
numbers, either directly from the hardware, or from a PRNG seeded with
the true random seed.
swrand.h is the main header of the library and should match its name,
therefore it is renamed to random.h. swrand.c is also renamed to match
the header.
Sergiu Moga [Mon, 3 Jun 2024 10:57:23 +0000 (13:57 +0300)]
plat/common/x86: Sanitize the ECTX slot on syscall entry
Commit c716bcca4822 ("{lib,arch,plat}: Redo syscall ctx's and swapgs logic"),
following a rework of architecture specific contexts and syscall entries,
by mistake removed the ECTX sanitization at the beginning of system calls.
This can result in #GP on x86 if the XSAVE header happens to be dirty.
Thus, bring this sanitization back.
Michalis Pappas [Sat, 1 Jun 2024 14:50:53 +0000 (16:50 +0200)]
arch/arm64: Add checks for min clang version
Add conditionals for clang to fix the build when arch features are
enabled. Set min clang version to 14 on all features as that is the
first clang version that supports branch-protection on arm64, and
for the rest of the features the only version tested.
Signed-off-by: Michalis Pappas <michalis@unikraft.io> Reviewed-by: Radu Nichita <radunichita99@gmail.com> Reviewed-by: Maria Sfiraiala <maria.sfiraiala@gmail.com> Approved-by: Razvan Deaconescu <razvand@unikraft.io>
GitHub-Closes: #1439
Michalis Pappas [Tue, 26 Dec 2023 16:01:14 +0000 (17:01 +0100)]
drivers/uktty/ns16550: Add early_init
Add early device init. When paging is enabled, this adds an mrd for
the ns16550 MMIO region to bootinfo so that the region is not unmapped
during paged memory init.
Michalis Pappas [Sun, 31 Mar 2024 15:42:14 +0000 (17:42 +0200)]
drivers/uktty/ns16550: Move driver initialization to uk_inittab
Move console initialization with the rest of devices at
UK_INIT_CLASS_SYS. Since the pf bus does not support priority
levels, and the console should start before the pf bus to
allow drivers to print their status, register directly with
init instead of the pf bus.
Michalis Pappas [Sun, 31 Mar 2024 15:31:01 +0000 (17:31 +0200)]
drivers/uktty/ns16550: Map device region at runtime
Map the ns16550 region at runtime. This is now required as paged memory
init unmaps any memory not registered by early devices, thus if early
UART is not enabled the device regions is not mapped.
Michalis Pappas [Sat, 30 Mar 2024 13:34:43 +0000 (14:34 +0100)]
drivers/uktty/pl011: Add early init
Add early device init. When paging is enabled, this adds an mrd for
the pl011 MMIO region to bootinfo so that the region is not unmapped
during paged memory init.
Michalis Pappas [Sat, 30 Mar 2024 13:06:09 +0000 (14:06 +0100)]
drivers/uktty/pl011: Move driver initialization to initttab
Move console initialization with the rest of devices at
UK_INIT_CLASS_SYS. Since the pf bus does not support priority
levels, and the console should start before the pf bus to
allow drivers to print their status, register directly with
init instead of the pf bus.
Michalis Pappas [Sun, 31 Mar 2024 12:54:36 +0000 (14:54 +0200)]
drivers/uktty/pl011: Map region on runtime
Map the pl011 region at runtime. This is now required as paged memory
init unmaps any memory not registered by early devices, thus if early
UART is not enabled the device regions is not mapped.
Michalis Pappas [Fri, 8 Mar 2024 05:22:12 +0000 (06:22 +0100)]
plat/kvm/arm: Add early init boot stage
Add boot stage for early initialization. This is invoked at the end
of early boot code, before passing control to the platform.
Early devices can use the APIs provided by the boot protocol to obtain
any information required, such as device regions and the kernel
command line.
Drivers that register with early_init() should append mrds of their
MMIO regions to bootinfo so that these regions are not unmapped
during paged memory init. These mrds must use the newly introduced
UKPLAT_MEMRT_DEVICE type.
Notice that early drivers should not call ukplat_bootinfo_coalesce(),
as mrd coalescing is performed once at the end of early_init().
Michalis Pappas [Wed, 15 May 2024 13:30:15 +0000 (15:30 +0200)]
plat/kvm/x86: Coalesce bootinfo at EFI post
With bootinfo coalesce having moved out of EFI common code,
and with kvm/x86 lacking an early init bootstage, do the coalescing
as the last part at EFI post before jumping to kernel.
Remove coalescing from EFI bootinfo setup to allow coalescing to
happen at a boot protocol agnostic way at early_init(), after the
initialization of early devices.
Michalis Pappas [Tue, 14 May 2024 16:01:45 +0000 (18:01 +0200)]
plat/common: Move coalesce out of bootinfo fdt setup
Remove coalescing out of bootinfo fdt setup to allow coalescing happen
at a boot protocol agnostic way at early_init(), after the initialization
of early devices.
Break down bootinfo_fdt_setup() into a pre and post coalesce functions
as the latter call ukplat_memory_alloc() which operates on ordered
regions.
Michalis Pappas [Mon, 25 Dec 2023 12:06:41 +0000 (13:06 +0100)]
plat/common: Add UKPLAT_MEMRT_DEVICE type
Regions of this type are added by device drivers that implement
an early init. Specifically, upon completion of the earlyinit boot
stage, device regions are expected to be mapped with appropriate
protections, and additionally be added to bootinfo using the
UKPLAT_MEMRT_DEVICE type.
drivers/ukbus/platform: Update uk_bus_bf_devmap() to operate per-page
Update uk_bus_pf_devmap() to handle a multi-page region page-by-page,
to avoid an error caused by a partially mapped device region, which
would cause ukplat_page_map() would return EEXIST and in turn cause
the subsequent ukplat_page_set_attr() to fail.
plat/common: Move vaddr check to callers of pgarch_page_mapx()
Move vaddr check from pgarch_page_mapx() to its callers, as that
function is also used to map the direct-mapped region, the vaddr
of which is past (__VADDR_MAX - len).
Rework the initialization of paged memory to provide a more flexible
implementation that is capable of handling regions beyond the limits
defined in the boot pagetables. The motivation for this change is to
allow mapping device regions that are unknown at compile-time, such
as Unprotected IPA Alias regions of Arm CCA Realms, the address of
which depends on the executing platform.
Under the new scheme bootinfo is reduced to only contain mrds that
correspond to valid memory regions. This deprecates the unmap_mrd
region and the UKPLAT_MEMRF_MAP / UKPLAT_MEMRF_UNMAP mrd flags.
Moreover, the boot pagetables are no longer updated during paged
memory init, but instead are replaced with a new pagetable that
initialized with the regions defined in bootinfo. Besides the
additional flexibility, this implementation has the potential of
some performance improvement as it removes expensive TLB flush
operations associated with unmap.
arch/arm64: Add definitions for block-size mappings
VMSAv8-64 does not provide a naming scheme for the block
size mapped by PT block descriptors at various translation
levels. Moreover, the block size varies depending on the
size of the translation granule.
To provide granularity agnostic definitions, use the
x86_64 terminology of Large / Huge pages.
plat/common/arm64: Set DIRECTMAP_AREA_END to the end of low VA range
The direct-mapped area maps the first 512GiB of the address space
to an architecture-defined region. In arm64 that uses the highest
512GiB of the low VA range. Update DIRECTMAP_AREA_END to correctly
specify the end of the low VA range.
Andrei Stan [Wed, 29 May 2024 20:56:33 +0000 (23:56 +0300)]
plat/xen: Remove redundant memory region
The reserved virtual address space for mappings was added in the global
list of memory regions. The constraint for tracked regions to be
page aligned caused the max physical address to get rounded to 0x0.
This removes the region from the list, thus side stepping the requirement.
Signed-off-by: Andrei Stan <andreistan2003@gmail.com> Reviewed-by: Sergiu Moga <sergiu@unikraft.io> Reviewed-by: Razvan Virtan <virtanrazvan@gmail.com> Approved-by: Razvan Deaconescu <razvand@unikraft.io>
GitHub-Closes: #1434
Andrei Tatar [Fri, 31 May 2024 13:45:19 +0000 (15:45 +0200)]
lib/posix-poll: Fix finalizer duplication in epoll
Commit 7b2e38171 (lib/posix-poll: Autoremove closed files from epoll)
introduced a logic error that would register a file finalizer on every
call to EPOLL_CTL_MOD. This lead to use-after-free errors when a file
was removed from epoll.
This change is a quick fix to this error. A more elegant refactoring of
epoll code should be considered when vfscore shim is no longer required.
Signed-off-by: Andrei Tatar <andrei@unikraft.io> Reviewed-by: Stefan Jumarea <stefanjumarea02@gmail.com> Reviewed-by: Radu Nichita <radunichita99@gmail.com> Approved-by: Razvan Deaconescu <razvand@unikraft.io>
GitHub-Closes: #1438
Andrei Tatar [Wed, 27 Mar 2024 14:06:40 +0000 (15:06 +0100)]
lib/ukfile: Remove padding from struct uk_statx
This change removes the padding fields from uk_statx, minimizing memory
waste when allocating inside the kernel.
Syscalls never reveal these kernel structs, and userspace allocates a
struct statx dictated by its libc.
Signed-off-by: Andrei Tatar <andrei@unikraft.io> Reviewed-by: Stefan Jumarea <stefanjumarea02@gmail.com> Approved-by: Razvan Deaconescu <razvand@unikraft.io>
GitHub-Closes: #1387
This assertion checks for mrd->pg_count parameter that was introduced
in the following commit: ad52a90f (uk/plat/memory: Introduce `pg_off` and `pg_count` memregion
fields, 2023-10-28)
Sergiu Moga [Sun, 26 May 2024 10:28:45 +0000 (13:28 +0300)]
{include, plat/common}: Add asm guards in `essentials.h`
Some macros of `essentials.h` can be used in assembly sources as well,
while others not so much. Allow one to safely include and use the former
by adding assembly guards in the header for the macros in question
Sergiu Moga [Sun, 3 Mar 2024 15:00:20 +0000 (17:00 +0200)]
{lib,arch,plat}: Redo syscall ctx's and `swapgs` logic
To make git bisecting and rebasing significantly easier and avoid
builds breaking across commits, this whole set of changes shall be
introduced under one single all encompassing commit.
Following the introduction of the concept of auxiliary stack pointers,
swapgs, `struct uk_syscall_ctx` and `struct ukarch_sysregs`, a number
of things have emerged:
- the aforemenetioned structs are very generic so they should be moved
under libcontext (arch/)
- swapgs introduces a significant inconsistency between ARM64 and x86_64
as we never know during an exception the state of
MSR_GS_BASE/MSR_KERNEL_GS_BASE
- auxiliary stack pointers have increased flexibility as every thread
and LCPU can have one and have private data stored in there than may
be accessed anytime, dependency free
Thus, this commit does the following:
1. Move/rename aforementioned structured to libcontext and document them
- lib/syscall_shim/arch/x86_64/sysregs.c -> arch/x86/sysctx.c
- lib/syscall_shim/arch/x86_64include/arch/sysregs.h -> arch/x86/x86_64include/uk/asm/sysctx.h
- s/struct ukarch_sysregs/struct ukarch_sysctx/ (and all related defs)
- struct uk_syscall_ctx from lib/syscall_shim/include/uk/syscall.h to
include/uk/arch/ctx.h as struct ukarch_execenv
- s/struct uk_syscall_ctx/struct ukarch_execenv/ (and all related defs)
- actually comment these functions
- re-adjust all places that make use of such definitions
2. Get rid of the `swapgs`, architecture specific holdback by exploiting
the flexibility of auxiliary stacks through the introduction of a new
always existing contrl block at their top end:
- introduce `struct ukarch_auxspcb` under libcontext
- add Unikraft system context as field to it so that we always have and
know Unikraft TLS (and LCPU in case ox x86_64) in a dependency free
and assumption free manner
- add a current frame pointer field: since the auxspscb will be part of
the auxiliary stack, we need to know the safe place where we can start
using the auxiliary stack area as a stack (this is also helpful in cases
where we need to nest on the auxstack)
-for the aforementione fields/structs, init/getter/setter functions have
been added and documented
- now the `swapgs` pair will only be done very early during system call
entry (and only there, not on clone child exit anymore either) just
enough so that we, first things first, switch to auxstack and push auxsp
so that on entry to C handler we will know that we must do a call to
`ukarch_sysctx_load` on the Unikraft sysctx we can get from the pushed
auxsp (another benefit of this is we get rid of MSR read/writes)
IMPORTANT NOTE: Additionally, some minor fixes have been made:
- Do not switch stack pointer to execenv pointer (previously
known as uk_syscall_ctx) during execenv loading as this implies that
functions such as `ukarch_ectx_load` or `ukarch_sysctx_load` would reuse
the space after the execenv as stack. While this is safe if the
execenv was passed through the stack, is definetely not safe if it was
passed through something like a heap buffer that may be bounded to the
execenv size by the caller. Instead, use one of the callee-saved
registers
- Set IRQ flag of the pushed flags of the caller during system call
early assembly entry (both native and binary for both architectures)
so that we don't have to explicitly set it during something like clone
child creation. This also reflects the reality better as no syscall
caller will have IRQ's disabled.
- Do not use spsr_el1, esr_el1 and elr_el1 during native system call
assembly prologue (UK_SYSCALL_EXECENV_PROLOGUE_DEFINE) on Arm, as they
are invalid because there is no actual SVC/exception happening. Instead,
try to emulate it by manually building sane values for them on the
created execenv to replicate an actual SVC while benefitting from not
dealing with the performance impacting flow of actually taking a SVC.
Andrei Tatar [Wed, 29 May 2024 12:13:23 +0000 (14:13 +0200)]
lib/ukfile: Ensure finalizers run after destructor
This change ensures that file finalizers are executed after the main
file destructor when the last strong reference to a file is released.
Finalizers may themselves release weak references, which in turn may
trigger the file destructor. Previously this could lead to destructors
being called in the wrong order.
Signed-off-by: Andrei Tatar <andrei@unikraft.io> Reviewed-by: Delia Pavel <delia_maria.pavel@stud.acs.upb.ro> Reviewed-by: Eduard Vintilă <eduard.vintila47@gmail.com> Approved-by: Razvan Deaconescu <razvand@unikraft.io>
GitHub-Closes: #1419
Andrei Tatar [Wed, 17 Apr 2024 17:12:02 +0000 (19:12 +0200)]
lib/posix-fdio: Add bincompat support for RWF_*
This change adds values for RWF_* flags in posix-fdio, allowing it to
interpret their meaning even without support from our (no)libc.
This enhances binary compatibility.
Signed-off-by: Andrei Tatar <andrei@unikraft.io> Reviewed-by: Mihnea Firoiu <mihneafiroiu0@gmail.com> Reviewed-by: Robert Zamfir <georobi.016@gmail.com> Approved-by: Razvan Deaconescu <razvand@unikraft.io>
GitHub-Closes: #1394
Andrei Tatar [Tue, 7 May 2024 16:33:53 +0000 (18:33 +0200)]
lib/posix-fdio: Allow owner/group == -1 for fchown
This change adds support in fchown for the owner or group to be passed
as -1, in which case that particular field is left unchanged.
This mimimcs the behavior of Linux.
Signed-off-by: Andrei Tatar <andrei@unikraft.io> Reviewed-by: Radu Nichita <radunichita99@gmail.com> Approved-by: Razvan Deaconescu <razvand@unikraft.io>
GitHub-Closes: #1416
Andrei Tatar [Thu, 1 Feb 2024 17:05:43 +0000 (18:05 +0100)]
lib/posix-tty: Add core tty ioctls to serial files
This change adds support for essential tty-specific ioctl commands to
the serial file implementation of `ctl`. These operations are either
no-ops or return a sensible description of the properties of the serial
file.
Checkpatch-Ignore: ENOSYS Signed-off-by: Andrei Tatar <andrei@unikraft.io> Reviewed-by: Marco Schlumpp <marco@unikraft.io> Reviewed-by: Delia Pavel <delia_maria.pavel@stud.acs.upb.ro> Approved-by: Razvan Deaconescu <razvand@unikraft.io>
GitHub-Closes: #1226
Andrei Tatar [Tue, 16 Jan 2024 14:44:19 +0000 (15:44 +0100)]
lib/posix-tty: Add stat support to tty files
This change adds support to tty files for the stat family of syscalls.
Returned values are a subset of what Linux provides, missing extended
attributes as well as timestamps. Where applicable, values match those
returned by Linux.
Signed-off-by: Andrei Tatar <andrei@unikraft.io> Reviewed-by: Marco Schlumpp <marco@unikraft.io> Reviewed-by: Delia Pavel <delia_maria.pavel@stud.acs.upb.ro> Approved-by: Razvan Deaconescu <razvand@unikraft.io>
GitHub-Closes: #1226
Andrei Tatar [Thu, 21 Dec 2023 20:32:43 +0000 (22:32 +0200)]
lib/*: Move stdio out of vfscore into posix-tty
This change moves stdio initialization from vfscore into posix-tty,
replacing the legacy stdin/out/err files with newvfs versions.
In addition, this move allows differing file types, either pseudofiles
or serial console, to be assigned independently to stdin and stdout/err.
Signed-off-by: Andrei Tatar <andrei@unikraft.io> Reviewed-by: Marco Schlumpp <marco@unikraft.io> Reviewed-by: Delia Pavel <delia_maria.pavel@stud.acs.upb.ro> Approved-by: Razvan Deaconescu <razvand@unikraft.io>
GitHub-Closes: #1226
Andrei Tatar [Thu, 21 Dec 2023 20:20:20 +0000 (22:20 +0200)]
lib/posix-tty: Introduce posix-tty library
This change introduces the posix-tty library, tasked with implementing
newvfs files for use as standard in/out/err.
The initial implementation provides drivers for pseudo-files (null,
void, and zero) as well as platform-specific serial console, akin to the
stdio submodule of legacy vfscore.
Signed-off-by: Andrei Tatar <andrei@unikraft.io> Reviewed-by: Marco Schlumpp <marco@unikraft.io> Reviewed-by: Delia Pavel <delia_maria.pavel@stud.acs.upb.ro> Approved-by: Razvan Deaconescu <razvand@unikraft.io>
GitHub-Closes: #1226
Sergiu Moga [Sun, 18 Feb 2024 09:22:10 +0000 (11:22 +0200)]
plat/kvm/x86: Add early COM1 init/print for CPU init errors
Usually early boot failures tend to be very confusing since there
is no message printed. To ease figuring out what went wrong, implement
a very basic early initialization macro for the COM1 port as well as
a corresponding printing macro that can be used before having a stack.
As a first use case of these newly added macros, print an error message
when failing early CPU features initialization, right before halting the
system.
Andrei Tatar [Thu, 22 Feb 2024 18:08:56 +0000 (19:08 +0100)]
lib/posix-socket: Expose internal socket syscalls
This change exposes Unikraft-internal syscalls that create sockets.
Both versions returning raw uk_files as well as opened file descriptors
are provided.
Signed-off-by: Andrei Tatar <andrei@unikraft.io> Reviewed-by: Mihnea Firoiu <mihneafiroiu0@gmail.com> Reviewed-by: Radu Nichita <radunichita99@gmail.com> Reviewed-by: Stefan Jumarea <stefanjumarea02@gmail.com> Approved-by: Razvan Deaconescu <razvand@unikraft.io>
GitHub-Closes: #1337
Andrei Tatar [Wed, 22 May 2024 12:09:40 +0000 (14:09 +0200)]
lib/posix-unixsocket: Add address sendmsg support
This change adds support for specifying a destination address in a
`sendmsg` call to a connection-free unix socket. The address is looked
up the same as would be done for `connect`.
Signed-off-by: Andrei Tatar <andrei@unikraft.io> Reviewed-by: Delia Pavel <delia_maria.pavel@stud.acs.upb.ro> Approved-by: Razvan Deaconescu <razvand@unikraft.io>
GitHub-Closes: #1421
Andrei Tatar [Wed, 22 May 2024 12:05:25 +0000 (14:05 +0200)]
lib/posix-unixsocket: Fix mismatched locks
This change fixes a lock/unlock pair with mismatched files in `sendmsg`,
probably introduced by a typo, preventing both crashes and inconsistent
lock state.
Signed-off-by: Andrei Tatar <andrei@unikraft.io> Reviewed-by: Delia Pavel <delia_maria.pavel@stud.acs.upb.ro> Approved-by: Razvan Deaconescu <razvand@unikraft.io>
GitHub-Closes: #1421
Andrei Tatar [Thu, 22 Feb 2024 17:12:54 +0000 (18:12 +0100)]
lib/posix-timerfd: Replace time syscalls
This change replaces the use of userspace time syscalls in posix-timerfd
with calls to Unikraft-internal syscalls, eliminating an undeclared
dependency on syscall-shim.
Signed-off-by: Andrei Tatar <andrei@unikraft.io> Reviewed-by: Mihnea Firoiu <mihneafiroiu0@gmail.com> Reviewed-by: Radu Nichita <radunichita99@gmail.com> Approved-by: Razvan Deaconescu <razvand@unikraft.io>
GitHub-Closes: #1336
Andrei Tatar [Thu, 22 Feb 2024 17:07:21 +0000 (18:07 +0100)]
lib/posix-time: Add internal syscall interface
This change adds Unikraft-internal syscalls (uk_sys_*) to posix-time,
allowing the use of time functions without either a libc or
syscall-shim selected.
Signed-off-by: Andrei Tatar <andrei@unikraft.io> Reviewed-by: Mihnea Firoiu <mihneafiroiu0@gmail.com> Reviewed-by: Radu Nichita <radunichita99@gmail.com> Approved-by: Razvan Deaconescu <razvand@unikraft.io>
GitHub-Closes: #1336
As agreed among the Unikraft maintainers, this commit removes the Linux
userspace platform target (incuding the tap netdev driver), that was
originally intended for debugging purposes. As there are ongoing efforts
in the Unikraft community to drastically improve the debugging experience
on all hypervisor platforms, there is no good reason to keep the
maintenance effort for the linuxu platform.
This platform already had a large backlog of features.
Signed-off-by: Simon Kuenzer <simon@unikraft.io> Reviewed-by: Marco Schlumpp <marco@unikraft.io> Approved-by: Razvan Deaconescu <razvand@unikraft.io>
GitHub-Closes: #1422
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