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2024-10-23um: Do not propagate dtb parameter to kernelTiwei Bie
This parameter is UML specific and is unknown to kernel. It should not be propagated to kernel, otherwise it will be passed to user space as an environment option by kernel with a warning like: Unknown kernel command line parameters "dtb=/foo", will be passed to user space. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20241011040441.1586345-5-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-23um: Do not propagate uml_dir parameter to kernelTiwei Bie
This parameter is UML specific and is unknown to kernel. It should not be propagated to kernel, otherwise it will be passed to user space as an environment option by kernel with a warning like: Unknown kernel command line parameters "uml_dir=/foo", will be passed to user space. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20241011040441.1586345-4-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-23um: Do not propagate mem parameter to kernelTiwei Bie
This parameter is UML specific and is unknown to kernel. It should not be propagated to kernel, otherwise it will be passed to user space as an environment option by kernel with a warning like: Unknown kernel command line parameters "mem=2G", will be passed to user space. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20241011040441.1586345-3-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-23um: Remove UML specific debug parameterTiwei Bie
It does nothing but emit a warning when 'debug' is provided in the kernel command line. It can be a bit annoying, as 'debug' is also a valid kernel parameter to enable kernel debugging. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20241011040441.1586345-2-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-23um: remove fault_catcher infrastructureJohannes Berg
This was perhaps intended to do _nofault copies, but the real reason is lost to history. Remove this, it's not needed, and using longjmp() out of the middle of the signal handler with all the state it has modified is not going to be a good idea anyway. Link: https://patch.msgid.link/20241010224513.901c4d390b3e.Ia74742668b44603c1ca23dd36f90e964e6e7ee55@changeid Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-23um: restore process nameJohannes Berg
After the execve() to disable ASLR, comm is now "exe", which is a bit confusing. Use readlink() to get this to the right name again. Disable stack frame size warnings on main.o since it's part of the initial userspace and can use larger stack. Fixes: 68b9883cc16e ("um: Discover host_task_size from envp") Link: https://patch.msgid.link/20241010161411.c576e2aeb3e5.I244d4f34b8a8555ee5bec0e1cf5027bce4cc491b@changeid Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-23um: make stub_exe _start() pure inline asmJohannes Berg
Since __attribute__((naked)) cannot be used with functions containing C statements, just generate the few instructions it needs in assembly directly. While at it, fix the stack usage ("1 + 2*x - 1" is odd) and document what it must do, and why it must adjust the stack. Fixes: 8508a5e0e9db ("um: Fix misaligned stack in stub_exe") Link: https://lore.kernel.org/linux-um/CABVgOSntH-uoOFMP5HwMXjx_f1osMnVdhgKRKm4uz6DFm2Lb8Q@mail.gmail.com/ Reviewed-by: David Gow <davidgow@google.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-21reiserfs: The last commitJan Kara
Deprecation period of reiserfs ends with the end of this year so it is time to remove it from the kernel. Acked-by: Darrick J. Wong <djwong@kernel.org> Acked-by: Christian Brauner <brauner@kernel.org> Signed-off-by: Jan Kara <jack@suse.cz>
2024-10-18um: Fix misaligned stack in stub_exeDavid Gow
The stub_exe could segfault when built with some compilers (e.g. gcc 13.2.0), as SSE instructions which relied on stack alignment could be generated, but the stack was misaligned. This seems to be due to the __start entry point being run with a 16-byte aligned stack, but the x86_64 SYSV ABI wanting the stack to be so aligned _before_ a function call (so it is misaligned when the function is entered due to the return address being pushed). The function prologue then realigns it. Because the entry point is never _called_, and hence there is no return address, the prologue is therefore actually misaligning it, and causing the generated movaps instructions to SIGSEGV. This results in the following error: start_userspace : expected SIGSTOP, got status = 139 Don't generate this prologue for __start by using __attribute__((naked)), which resolves the issue. Fixes: 32e8eaf263d9 ("um: use execveat to create userspace MMs") Signed-off-by: David Gow <davidgow@google.com> Link: https://lore.kernel.org/linux-um/CABVgOS=boUoG6=LHFFhxEd8H8jDP1zOaPKFEjH+iy2n2Q5S2aQ@mail.gmail.com/ Link: https://patch.msgid.link/20241017231007.1500497-2-davidgow@google.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-17um: Disable auto variable initialization for stub_exe.cNathan Chancellor
When automatic variable initialization is enabled via CONFIG_INIT_STACK_ALL_{PATTERN,ZERO}, clang will insert a call to memset() to initialize an object created with __builtin_alloca(). This ultimately breaks the build when linking stub_exe because it is a standalone executable that does not include or link against memset(). ld: arch/um/kernel/skas/stub_exe.o: in function `_start': arch/um/kernel/skas/stub_exe.c:83:(.ltext+0x15): undefined reference to `memset' Disable automatic variable initialization for stub_exe.c by passing the default value of 'uninitialized' to '-ftrivial-auto-var-init', which avoids generating the call to memset(). This code is small and runs quickly as it is just designed to set up an environment, so stack variable initialization is unnecessary overhead for little gain. Fixes: 32e8eaf263d9 ("um: use execveat to create userspace MMs") Signed-off-by: Nathan Chancellor <nathan@kernel.org> Link: https://patch.msgid.link/20241016-uml-fix-stub_exe-clang-v1-2-3d6381dc5a78@kernel.org Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-17um: Fix passing '-n' to linker for stub_exeNathan Chancellor
When building stub_exe with clang, there is an error because '-n' is not a recognized flag by the clang driver (which is being used to invoke the linker): clang: error: unknown argument: '-n' '-n' should be passed along to the linker, as it is the short flag for '--nmagic', so prefix it with '-Wl,'. Fixes: 32e8eaf263d9 ("um: use execveat to create userspace MMs") Signed-off-by: Nathan Chancellor <nathan@kernel.org> Link: https://patch.msgid.link/20241016-uml-fix-stub_exe-clang-v1-1-3d6381dc5a78@kernel.org Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-16vdso: Introduce vdso/page.hVincenzo Frascino
The VDSO implementation includes headers from outside of the vdso/ namespace. Introduce vdso/page.h to make sure that the generic library uses only the allowed namespace. Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> # m68k Link: https://lore.kernel.org/all/20241014151340.1639555-3-vincenzo.frascino@arm.com
2024-10-10um: Switch to 4 level page tables on 64 bitBenjamin Berg
The larger memory space is useful to support more applications inside UML. One example for this is ASAN instrumentation of userspace applications which requires addresses that would otherwise not be available. Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20240919124511.282088-11-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: clear all memory in new userspace processesBenjamin Berg
With the change to use execve() we can now safely clear the memory up to STUB_START as rseq will not be trying to use memory in that region. Also, on 64 bit the previous changes should mean that there is no usable memory range above the stub. Make the change and remove the comment as it is not needed anymore. Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20240919124511.282088-10-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: Discover host_task_size from envpBenjamin Berg
When loading the UML binary, the host kernel will place the stack at the highest possible address. It will then map the program name and environment variables onto the start of the stack. As such, an easy way to figure out the host_task_size is to use the highest pointer to an environment variable as a reference. Ensure that this works by disabling address layout randomization and re-executing UML in case it was enabled. This increases the available TASK_SIZE for 64 bit UML considerably. Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20240919124511.282088-9-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: Limit TASK_SIZE to the addressable rangeBenjamin Berg
We may have a TASK_SIZE from the host that is bigger than UML is able to address with a three-level pagetable on 64-bit. Guard against that by clipping the maximum TASK_SIZE to the maximum addressable area. Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20240919124511.282088-8-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: Calculate stub data address relative to stub codeBenjamin Berg
Instead of using the current stack pointer, we can also use the current instruction to calculate where the stub data is. With this the stub data only needs to be aligned to a full page boundary. Changing this has the advantage that we do not have a hole in the memory space above the stub data (which would need to be explicitly cleared). Another motivation to do this is that with the planned addition of a SECCOMP based userspace the stack pointer may not be fully trustworthy. Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20240919124511.282088-7-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: Add compile time assert that stub fits on a pageBenjamin Berg
The code assumes that the stub code can fit into a single page. This is unlikely to ever change, but add a link time assert instead so that there will be no hard to debug error. Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20240919124511.282088-6-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: Set parent death signal for winch thread/processBenjamin Berg
The winch "thread" is really a separate process. Using prctl to set PR_SET_PDEATHSIG ensures that this separate thread will be killed if the UML kernel itself dies unexpectedly and does not perform proper cleanup. Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20240919124511.282088-5-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: Set parent death signal for userspace processBenjamin Berg
Enable PR_SET_PDEATHSIG so that the UML userspace process will be killed when the kernel exits unexpectedly. Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20240919124511.282088-4-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: use execveat to create userspace MMsBenjamin Berg
Using clone will not undo features that have been enabled by libc. An example of this already happening is rseq, which could cause the kernel to read/write memory of the userspace process. In the future the standard library might also use mseal by default to protect itself, which would also thwart our attempts at unmapping everything. Solve all this by taking a step back and doing an execve into a tiny static binary that sets up the minimal environment required for the stub without using any standard library. That way we have a clean execution environment that is fully under the control of UML. Note that this changes things a bit as the FDs are not anymore shared with the kernel. Instead, we explicitly share the FDs for the physical memory and all existing iomem regions. Doing this is fine, as iomem regions cannot be added at runtime. Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20240919124511.282088-3-benjamin@sipsolutions.net [use pipe() instead of pipe2(), remove unneeded close() calls] Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: remove auxiliary FP registersBenjamin Berg
We do not need the extra save/restore of the FP registers when getting the fault information. This was originally added in commit 2f56debd77a8 ("uml: fix FP register corruption") but at that time the code was not saving/restoring the FP registers when switching to userspace. This was fixed in commit fbfe9c847edf ("um: Save FPU registers between task switches") and since then the auxiliary registers have not been useful. Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20241004233821.2130874-1-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: remove dependency on undefined CC_CAN_LINK_STATIC_NO_RUNTIME_DEPSMasahiro Yamada
CC_CAN_LINK_STATIC_NO_RUNTIME_DEPS is not defined anywhere. In the submitted patch set [1], the first patch "um/kconfig: introduce CC_CAN_LINK_STATIC_NO_RUNTIME_DEPS" was not applied. Only 2/3 and 3/3 were applied, which are now: - 730586ff7fad ("um: Allow static linking for non-glibc implementations") - 5e1121cd43d4 ("um: Some fixes to build UML with musl") Given that nobody has noticed the missing first patch for many years, it seems it was unnecessary. [1]: https://lore.kernel.org/lkml/20200719210222.2811-1-ignat@cloudflare.com/ Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Link: https://patch.msgid.link/20240924113342.32530-1-masahiroy@kernel.org Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: Remove 3-level page table support on i386Tiwei Bie
The highmem support has been removed by commit a98a6d864d3b ("um: Remove broken highmem support"). The 2-level page table is sufficient on UML/i386 now. Remove the 3-level page table support on UML/i386 which is still marked as experimental. Suggested-by: Benjamin Berg <benjamin@sipsolutions.net> Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20240918061702.614837-1-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: always use the internal copy of the FP registersBenjamin Berg
When switching from userspace to the kernel, all registers including the FP registers are copied into the kernel and restored later on. As such, the true source for the FP register state is actually already in the kernel and they should never be grabbed from the userspace process. Change the various places to simply copy the data from the internal FP register storage area. Note that on i386 the format of PTRACE_GETFPREGS and PTRACE_GETFPXREGS is different enough that conversion would be needed. With this patch, -EINVAL is returned if the non-native format is requested. The upside is, that this patchset fixes setting registers via ptrace (which simply did not work before) as well as fixing setting floating point registers using the mcontext on signal return on i386. Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20240913133845.964292-1-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: Fix the return value of elf_core_copy_task_fpregsTiwei Bie
This function is expected to return a boolean value, which should be true on success and false on failure. Fixes: d1254b12c93e ("uml: fix x86_64 core dump crash") Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20240913023302.130300-1-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: Fix the definition for physmem_sizeTiwei Bie
Currently physmem_size is defined as long long but declared locally as unsigned long long before using it in separate .c files. Make them match by defining physmem_size as unsigned long long and also move the declaration to a common header to allow the compiler to check it. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20240916045950.508910-5-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: Remove highmem leftoversTiwei Bie
Highmem was only supported on UML/i386. And the support has been removed by commit a98a6d864d3b ("um: Remove broken highmem support"). Remove the leftovers and stop UML from trying to setup highmem when the sum of physmem_size and iomem_size exceeds max_physmem. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20240916045950.508910-4-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: Fix potential integer overflow during physmem setupTiwei Bie
This issue happens when the real map size is greater than LONG_MAX, which can be easily triggered on UML/i386. Fixes: fe205bdd1321 ("um: Print minimum physical memory requirement") Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20240916045950.508910-3-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: Remove the redundant declaration of high_physmemTiwei Bie
high_physmem has already been declared in as-layout.h, so there is no need to declare it explicitly in the .c file again. While at it, group the declarations of __real_malloc and __real_free together to make the code slightly more readable. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20240916045950.508910-2-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: Remove unused os_getpgrp functionBenjamin Berg
The function is not used anywhere. Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20240913134442.967599-5-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: Remove unused os_stop_processBenjamin Berg
The function is not used anywhere. Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20240913134442.967599-4-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: Remove unused os_process_parentBenjamin Berg
The function is not used anywhere. Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20240913134442.967599-3-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-10um: Remove unused os_process_pcBenjamin Berg
The function is not used anywhere in the codebase. Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20240913134442.967599-2-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-10-02move asm/unaligned.h to linux/unaligned.hAl Viro
asm/unaligned.h is always an include of asm-generic/unaligned.h; might as well move that thing to linux/unaligned.h and include that - there's nothing arch-specific in that header. auto-generated by the following: for i in `git grep -l -w asm/unaligned.h`; do sed -i -e "s/asm\/unaligned.h/linux\/unaligned.h/" $i done for i in `git grep -l -w asm-generic/unaligned.h`; do sed -i -e "s/asm-generic\/unaligned.h/linux\/unaligned.h/" $i done git mv include/asm-generic/unaligned.h include/linux/unaligned.h git mv tools/include/asm-generic/unaligned.h tools/include/linux/unaligned.h sed -i -e "/unaligned.h/d" include/asm-generic/Kbuild sed -i -e "s/__ASM_GENERIC/__LINUX/" include/linux/unaligned.h tools/include/linux/unaligned.h
2024-09-27Merge tag 'uml-for-linus-6.12-rc1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux Pull UML updates from Richard Weinberger: - Removal of dead code (TT mode leftovers, etc) - Fixes for the network vector driver - Fixes for time-travel mode * tag 'uml-for-linus-6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux: um: fix time-travel syscall scheduling hack um: Remove outdated asm/sysrq.h header um: Remove the declaration of user_thread function um: Remove the call to SUBARCH_EXECVE1 macro um: Remove unused mm_fd field from mm_id um: Remove unused fields from thread_struct um: Remove the redundant newpage check in update_pte_range um: Remove unused kpte_clear_flush macro um: Remove obsoleted declaration for execute_syscall_skas user_mode_linux_howto_v2: add VDE vector support in doc vector_user: add VDE support um: remove ARCH_NO_PREEMPT_DYNAMIC um: vector: Fix NAPI budget handling um: vector: Replace locks guarding queue depth with atomics um: remove variable stack array in os_rcv_fd_msg()
2024-09-27[tree-wide] finally take no_llseek outAl Viro
no_llseek had been defined to NULL two years ago, in commit 868941b14441 ("fs: remove no_llseek") To quote that commit, At -rc1 we'll need do a mechanical removal of no_llseek - git grep -l -w no_llseek | grep -v porting.rst | while read i; do sed -i '/\<no_llseek\>/d' $i done would do it. Unfortunately, that hadn't been done. Linus, could you do that now, so that we could finally put that thing to rest? All instances are of the form .llseek = no_llseek, so it's obviously safe. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2024-09-12um: fix time-travel syscall scheduling hackJohannes Berg
The schedule() call there really never did anything at least since the introduction of the EEVDF scheduler, but now I found a case where we permanently hang in a loop of -ERESTARTNOINTR (due to locking.) Work around it by making any syscalls with error return take time (and then schedule after) so we cannot hang in such a loop forever. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2024-09-12um: Remove outdated asm/sysrq.h headerTiwei Bie
This header no longer serves a purpose after show_trace was removed by commit 9d1ee8ce92e1 ("um: Rewrite show_stack()"). Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2024-09-12um: Remove the declaration of user_thread functionTiwei Bie
This function has never been defined since its declaration was introduced by commit 1da177e4c3f4 ("Linux-2.6.12-rc2"). Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2024-09-12um: Remove the call to SUBARCH_EXECVE1 macroTiwei Bie
This macro has never been defined by any supported sub-architectures in tree since it was introduced by commit 1d3468a6643a ("[PATCH uml: move _kern.c files"). Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2024-09-12um: Remove unused mm_fd field from mm_idTiwei Bie
It's no longer used since the removal of the SKAS3/4 support. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2024-09-12um: Remove unused fields from thread_structTiwei Bie
These fields are no longer used since the removal of tt mode. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2024-09-12um: Remove the redundant newpage check in update_pte_rangeTiwei Bie
The two checks have been identical since commit ef714f15027c ("um: remove force_flush_all from fork_handler"). And the inner one isn't necessary anymore. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2024-09-12um: Remove unused kpte_clear_flush macroTiwei Bie
This macro has no users, and __flush_tlb_one doesn't exist either. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2024-09-12um: Remove obsoleted declaration for execute_syscall_skasGaosheng Cui
The execute_syscall_skas() have been removed since commit e32dacb9f481 ("[PATCH] uml: system call path cleanup"), and now it is useless, so remove it. Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com> Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Richard Weinberger <richard@nod.at>
2024-09-12vector_user: add VDE supportRenzo Davoli
This is the actual implementation of VDE support as a vector transport. Signed-off-by: Renzo Davoli <renzo@cs.unibo.it> Acked-By: Anton Ivanov <anton.ivanov@cambridgegreys.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2024-09-12um: remove ARCH_NO_PREEMPT_DYNAMICJohannes Berg
There's no such symbol and we currently don't have any of the mechanisms to make boot-time selection cheap enough, so we can't have HAVE_PREEMPT_DYNAMIC_CALL or HAVE_PREEMPT_DYNAMIC_KEY. Remove the select statement. Reported-by: Lukas Bulwahn <lbulwahn@redhat.com> Fixes: cd01672d64a3 ("um: Enable preemption in UML") Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2024-09-12um: vector: Fix NAPI budget handlingAnton Ivanov
Fix the handling of NAPI budget. Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2024-09-12um: vector: Replace locks guarding queue depth with atomicsAnton Ivanov
UML vector drivers use ring buffer structures which map preallocated skbs onto mmsg vectors for use with sendmmsg and recvmmsg. They are designed around a single consumer, single producer pattern allowing simultaneous enqueue and dequeue. Lock debugging with preemption showed possible races when locking the queue depth. This patch addresses this by removing extra locks, adding barriers and making queue depth inc/dec and access atomic. Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com> Signed-off-by: Richard Weinberger <richard@nod.at>
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