wine-devel

wine-devel@winehq.org

9 participants
84457 discussions

Moving Wine Mono
by Esme Povirk 16 Feb '24

16 Feb '24

I'm starting the process of moving Wine Mono off of my personal Github account and onto the Winehq Gitlab in the organization here: https://gitlab.winehq.org/wine-mono Obviously, I haven't gotten very far yet, as the main repo for Wine Mono itself doesn't exist, but the intent is to move every submodule that we've forked (as well as projects I've started just for Wine Mono) over to Winehq, set up CI there, and archive my Github repos. The procedure for contributing will be to fork the repository and create merge requests (which I will also do for my own contributions, once we're set up for it). I'm also rethinking the branch structure. The Mono repo will have three mainline branches: upstream (the upstream project as it exists in the official repos), main (upstream plus further development that I will review and maintain), and wine-mono (main plus changes we have only in Wine). The "upstream" and "main" branches should be the same for any upstream that is responsive and cares about preserving ABI compatibility (right now that's just FNA and monoDX). The wine-mono branch should only exist for projects that have a general use case in which Wine's changes don't make sense (I think that's just Mono, corefx, and FNA). The answer to "which branch should I send my MR to?" will almost always be main. There should be a very few changes on wine-mono only. The ones I can think of off the top of my head are: enabling native dll loading without coree hooks, renaming a bunch of assemblies to start with "WineMono.", winforms hooks in FNA, and proprietary media formats in FNA. Over the years we've been doing a lot of development on top of Mono that, in my opinion, belongs upstream. I will also accept changes to Mono that have nothing to do with Wine, such as winforms changes, and I will try to keep the main branch working for use cases outside of Wine and Windows, to the extent that it's feasible (there are a bunch of configurations I can't easily test, like PowerPC, ARM, Android, and iOS, and I can't see myself doing development to support new platforms like M1). I don't know how much development interest there will be, but I seem to be in a unique position to maintain Framework Mono, and I think it is needed.

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Re: [PATCH 02/31] ntsync: Introduce NTSYNC_IOC_CREATE_SEM.
by Elizabeth Figura 15 Feb '24

15 Feb '24

On Thursday, 15 February 2024 01:28:32 CST Greg Kroah-Hartman wrote: > On Wed, Feb 14, 2024 at 05:36:38PM -0600, Elizabeth Figura wrote: > > This corresponds to the NT syscall NtCreateSemaphore(). > > > > Semaphores are one of three types of object to be implemented in this driver, > > the others being mutexes and events. > > > > An NT semaphore contains a 32-bit counter, and is signaled and can be acquired > > when the counter is nonzero. The counter has a maximum value which is specified > > at creation time. The initial value of the semaphore is also specified at > > creation time. There are no restrictions on the maximum and initial value. > > > > Each object is exposed as an file, to which any number of fds may be opened. > > When all fds are closed, the object is deleted. > > > > Signed-off-by: Elizabeth Figura <zfigura(a)codeweavers.com> > > --- > > .../userspace-api/ioctl/ioctl-number.rst | 2 + > > drivers/misc/ntsync.c | 120 ++++++++++++++++++ > > include/uapi/linux/ntsync.h | 21 +++ > > 3 files changed, 143 insertions(+) > > create mode 100644 include/uapi/linux/ntsync.h > > > > diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst > > index 457e16f06e04..2f5c6994f042 100644 > > --- a/Documentation/userspace-api/ioctl/ioctl-number.rst > > +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst > > @@ -173,6 +173,8 @@ Code Seq# Include File Comments > > 'M' 00-0F drivers/video/fsl-diu-fb.h conflict! > > 'N' 00-1F drivers/usb/scanner.h > > 'N' 40-7F drivers/block/nvme.c > > +'N' 80-8F uapi/linux/ntsync.h NT synchronization primitives > > + <mailto:wine-devel@winehq.org> > > 'O' 00-06 mtd/ubi-user.h UBI > > 'P' all linux/soundcard.h conflict! > > 'P' 60-6F sound/sscape_ioctl.h conflict! > > diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c > > index e4969ef90722..3ad86d98b82d 100644 > > --- a/drivers/misc/ntsync.c > > +++ b/drivers/misc/ntsync.c > > @@ -5,26 +5,146 @@ > > * Copyright (C) 2024 Elizabeth Figura > > */ > > > > +#include <linux/anon_inodes.h> > > +#include <linux/file.h> > > #include <linux/fs.h> > > #include <linux/miscdevice.h> > > #include <linux/module.h> > > +#include <linux/slab.h> > > +#include <uapi/linux/ntsync.h> > > > > #define NTSYNC_NAME "ntsync" > > > > +enum ntsync_type { > > + NTSYNC_TYPE_SEM, > > +}; > > + > > +struct ntsync_obj { > > + enum ntsync_type type; > > + > > + union { > > + struct { > > + __u32 count; > > + __u32 max; > > + } sem; > > + } u; > > + > > + struct file *file; > > + struct ntsync_device *dev; > > +}; > > + > > +struct ntsync_device { > > + struct file *file; > > +}; > > No reference counting is needed for your ntsync_device? Or are you > relying on the reference counting of struct file here? > > You pass around pointers to this structure, and save it off into other > structures, how do you know it is "safe" to do so? Yes, this relies on the reference counting of struct file. The sync objects (semaphore etc.) grab a reference when they're created, via get_file(), and release it when they're destroyed. This reference is taken from within ioctls on the ntsync_device, so the file must be valid when we grab a reference. Maybe I'm missing something, though?

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Re: [PATCH 01/31] ntsync: Introduce the ntsync driver and character device.
by Elizabeth Figura 15 Feb '24

15 Feb '24

On Wednesday, 14 February 2024 19:57:23 CST Randy Dunlap wrote: > Hi, > > On 2/14/24 15:36, Elizabeth Figura wrote: > > ntsync uses a misc device as the simplest and least intrusive uAPI interface. > > > > Each file description on the device represents an isolated NT instance, intended > > to correspond to a single NT virtual machine. > > > > Signed-off-by: Elizabeth Figura <zfigura(a)codeweavers.com> > > --- > > drivers/misc/Kconfig | 9 ++++++++ > > drivers/misc/Makefile | 1 + > > drivers/misc/ntsync.c | 52 +++++++++++++++++++++++++++++++++++++++++++ > > 3 files changed, 62 insertions(+) > > create mode 100644 drivers/misc/ntsync.c > > > > diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig > > index 4fb291f0bf7c..bdd8a71bd853 100644 > > --- a/drivers/misc/Kconfig > > +++ b/drivers/misc/Kconfig > > @@ -504,6 +504,15 @@ config OPEN_DICE > > measured boot flow. Userspace can use CDIs for remote attestation > > and sealing. > > > > +config NTSYNC > > + tristate "NT synchronization primitive emulation" > > + help > > + This module provides kernel support for emulation of Windows NT > > + synchronization primitives. It is not a hardware driver. > > + > > + To compile this driver as a module, choose M here: the > > + module will be called ntsync. > > + > > If unsure, say N. > > It looks like the "If unsure" line belongs to the OPEN_DICE kconfig entry > above here. If you want one for NTSYNC, please add one. Oops, looks like that was a bad rebase :-( > > > > > config VCPU_STALL_DETECTOR > > > > diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c > > new file mode 100644 > > index 000000000000..e4969ef90722 > > --- /dev/null > > +++ b/drivers/misc/ntsync.c > > @@ -0,0 +1,52 @@ > > +// SPDX-License-Identifier: GPL-2.0-only > > +/* > > + * ntsync.c - Kernel driver for NT synchronization primitives > > + * > > + * Copyright (C) 2024 Elizabeth Figura > > It would be nice to have your email address above... > > > + */ > > + > > > + > > +MODULE_AUTHOR("Elizabeth Figura"); > > but at least please add it in MODULE_AUTHOR(). Yes it's optional, but > roughly 7900 of 10400 entries do include it (according to my rough > grepping). > > Yes, I know that it's in MAINTAINERS. Will add, thanks. As you guessed I did just pick an arbitrary module to copy.

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[PATCH 00/31] NT synchronization primitive driver
by Elizabeth Figura 15 Feb '24

15 Feb '24

This patch series introduces a new char misc driver, /dev/ntsync, which is used to implement Windows NT synchronization primitives. This was previously submitted as an RFC [1]. Since there were no major changes requested to the last RFC revision, I've stripped the RFC prefix. [1] https://lore.kernel.org/lkml/20240131021356.10322-1-zfigura@codeweavers.com/ == Background == The Wine project emulates the Windows API in user space. One particular part of that API, namely the NT synchronization primitives, have historically been implemented via RPC to a dedicated "kernel" process. However, more recent applications use these APIs more strenuously, and the overhead of RPC has become a bottleneck. The NT synchronization APIs are too complex to implement on top of existing primitives without sacrificing correctness. Certain operations, such as NtPulseEvent() or the "wait-for-all" mode of NtWaitForMultipleObjects(), require direct control over the underlying wait queue, and implementing a wait queue sufficiently robust for Wine in user space is not possible. This proposed driver, therefore, implements the problematic interfaces directly in the Linux kernel. This driver was presented at Linux Plumbers Conference 2023. For those further interested in the history of synchronization in Wine and past attempts to solve this problem in user space, a recording of the presentation can be viewed here: https://www.youtube.com/watch?v=NjU4nyWyhU8 == Performance == The gain in performance varies wildly depending on the application in question and the user's hardware. For some games NT synchronization is not a bottleneck and no change can be observed, but for others frame rate improvements of 50 to 150 percent are not atypical. The following table lists frame rate measurements from a variety of games on a variety of hardware, taken by users Dmitry Skvortsov, FuzzyQuils, OnMars, and myself: Game Upstream ntsync improvement =========================================================================== Anger Foot 69 99 43% Call of Juarez 99.8 224.1 125% Dirt 3 110.6 860.7 678% Forza Horizon 5 108 160 48% Lara Croft: Temple of Osiris 141 326 131% Metro 2033 164.4 199.2 21% Resident Evil 2 26 77 196% The Crew 26 51 96% Tiny Tina's Wonderlands 130 360 177% Total War Saga: Troy 109 146 34% =========================================================================== == Patches == The intended semantics of the patches are broadly intended to match those of the corresponding Windows functions. For those not already familiar with the Windows functions (or their undocumented behaviour), patch 31/31 provides a detailed specification, and individual patches also include a brief description of the API they are implementing. The patches making use of this driver in Wine can be retrieved or browsed here: https://repo.or.cz/wine/zf.git/shortlog/refs/heads/ntsync5 == Implementation == Some aspects of the implementation may deserve particular comment: * In the interest of performance, each object is governed only by a single spinlock. However, NTSYNC_IOC_WAIT_ALL requires that the state of multiple objects be changed as a single atomic operation. In order to achieve this, we first take a device-wide lock ("wait_all_lock") any time we are going to lock more than one object at a time. The maximum number of objects that can be used in a vectored wait, and therefore the maximum that can be locked simultaneously, is 64. This number is NT's own limit. The acquisition of multiple spinlocks will degrade performance. This is a conscious choice, however. Wait-for-all is known to be a very rare operation in practice, especially with counts that approach the maximum, and it is the intent of the ntsync driver to optimize wait-for-any at the expense of wait-for-all as much as possible. * NT mutexes are tied to their threads on an OS level, and the kernel includes builtin support for "robust" mutexes. In order to keep the ntsync driver self-contained and avoid touching more code than necessary, it does not hook into task exit nor use pids. Instead, the user space emulator is expected to manage thread IDs and pass them as an argument to any relevant functions; this is the "owner" field of ntsync_wait_args and ntsync_mutex_args. When the emulator detects that a thread dies, it should therefore call NTSYNC_IOC_MUTEX_KILL on any open mutexes. * ntsync is module-capable mostly because there was nothing preventing it, and because it aided development. It is not a hard requirement, though. == Previous versions == Changes from the last (v2) RFC: * Add a new wait flag NTSYNC_WAIT_REALTIME. I had originally missed a corner case in NtWaitForMultipleObjects() related to its interaction with system time adjustments. Essentially the function is sometimes supposed to respect system time adjustments and sometimes supposed to ignore them, so in order to achieve this I've added a function that controls which flag is being synchronized to. Thanks Piotr Caban for catching this. * Add tests for overflowing semaphore and mutex counters, and a test for exceeding NTSYNC_MAX_WAIT_COUNT, per Andi Kleen. * Add a more intense and realistic test involving multiple threads using the same mutex to access data, per Andi Kleen. * Use check_add_overflow() instead of writing out overflow checking manually [and thereby avoid relying on -fwrapv]. * Add some missing headers that were being implicitly included: atomic.h, hrtimer.h, ktime.h, sched.h, sched/signal.h, spinlock.h. * Link to RFC v2: https://lore.kernel.org/lkml/20240131021356.10322-1-zfigura@codeweavers.com/ * Link to RFC v1: https://lore.kernel.org/lkml/20240124004028.16826-1-zfigura@codeweavers.com/ Elizabeth Figura (31): ntsync: Introduce the ntsync driver and character device. ntsync: Introduce NTSYNC_IOC_CREATE_SEM. ntsync: Introduce NTSYNC_IOC_SEM_POST. ntsync: Introduce NTSYNC_IOC_WAIT_ANY. ntsync: Introduce NTSYNC_IOC_WAIT_ALL. ntsync: Introduce NTSYNC_IOC_CREATE_MUTEX. ntsync: Introduce NTSYNC_IOC_MUTEX_UNLOCK. ntsync: Introduce NTSYNC_IOC_MUTEX_KILL. ntsync: Introduce NTSYNC_IOC_CREATE_EVENT. ntsync: Introduce NTSYNC_IOC_EVENT_SET. ntsync: Introduce NTSYNC_IOC_EVENT_RESET. ntsync: Introduce NTSYNC_IOC_EVENT_PULSE. ntsync: Introduce NTSYNC_IOC_SEM_READ. ntsync: Introduce NTSYNC_IOC_MUTEX_READ. ntsync: Introduce NTSYNC_IOC_EVENT_READ. ntsync: Introduce alertable waits. ntsync: Allow waits to use the REALTIME clock. selftests: ntsync: Add some tests for semaphore state. selftests: ntsync: Add some tests for mutex state. selftests: ntsync: Add some tests for NTSYNC_IOC_WAIT_ANY. selftests: ntsync: Add some tests for NTSYNC_IOC_WAIT_ALL. selftests: ntsync: Add some tests for wakeup signaling with WINESYNC_IOC_WAIT_ANY. selftests: ntsync: Add some tests for wakeup signaling with WINESYNC_IOC_WAIT_ALL. selftests: ntsync: Add some tests for manual-reset event state. selftests: ntsync: Add some tests for auto-reset event state. selftests: ntsync: Add some tests for wakeup signaling with events. selftests: ntsync: Add tests for alertable waits. selftests: ntsync: Add some tests for wakeup signaling via alerts. selftests: ntsync: Add a stress test for contended waits. maintainers: Add an entry for ntsync. docs: ntsync: Add documentation for the ntsync uAPI. Documentation/userspace-api/index.rst | 1 + .../userspace-api/ioctl/ioctl-number.rst | 2 + Documentation/userspace-api/ntsync.rst | 399 +++++ MAINTAINERS | 9 + drivers/misc/Kconfig | 9 + drivers/misc/Makefile | 1 + drivers/misc/ntsync.c | 1146 ++++++++++++++ include/uapi/linux/ntsync.h | 62 + tools/testing/selftests/Makefile | 1 + .../testing/selftests/drivers/ntsync/Makefile | 8 + tools/testing/selftests/drivers/ntsync/config | 1 + .../testing/selftests/drivers/ntsync/ntsync.c | 1407 +++++++++++++++++ 12 files changed, 3046 insertions(+) create mode 100644 Documentation/userspace-api/ntsync.rst create mode 100644 drivers/misc/ntsync.c create mode 100644 include/uapi/linux/ntsync.h create mode 100644 tools/testing/selftests/drivers/ntsync/Makefile create mode 100644 tools/testing/selftests/drivers/ntsync/config create mode 100644 tools/testing/selftests/drivers/ntsync/ntsync.c base-commit: e21817acb23ece75d41a4fa7b40c85550f147389 -- 2.43.0

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Wine staging 9.2 release
by Alistair Leslie-Hughes 11 Feb '24

11 Feb '24

Binary packages for various distributions will be available from: https://www.winehq.org/download Summary since last release * Rebased to current wine 9.2 (489 patches are applied to wine vanilla) Upstreamed (Either directly from staging or fixed with a similar patch). * d3dx9_36-D3DXDisassembleShader Added: * None Updated: * vkd3d-latest * ntdll-Junction_Points The patch count is down due to the upstreaming of the rawinput changes and due to conflicts, the wine-staging rawinput patches are disabled. Where can you help * Run Steam/Battle.net/GOG/UPlay/Epic * Test your favorite game. * Test your favorite applications. * Improve staging patches and get them accepted upstream. * Suggest patches to be included in staging. As always, if you find a bug, please report it via https://bugs.winehq.org Best Regards Alistair.

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Wine staging 9.0 release
by Alistair Leslie-Hughes 10 Feb '24

10 Feb '24

Binary packages for various distributions will be available from: https://www.winehq.org/download Summary since last release * Rebased to current wine 9.0 (505 patches are applied to wine vanilla) Upstreamed (Either directly from staging or fixed with a similar patch). * None Added: * None Updated: * vkd3d-latest Where can you help * Run Steam/Battle.net/GOG/UPlay/Epic * Test your favorite game. * Test your favorite applications. * Improve staging patches and get them accepted upstream. * Suggest patches to be included in staging. As always, if you find a bug, please report it via https://bugs.winehq.org Best Regards Alistair.

4 5

Staging reparse point fix
by DodoGTA GT 09 Feb '24

09 Feb '24

Hello, I have made an updated version of the reparse points patchset fix that should reduce the patch noise quite a bit (I think the original version is better in terms of code duplication though)

2 1

kernelbase: adding support for callback in CopyFileEx, and implementing CopyFile2
by sendtokartavya＠gmail.com 08 Feb '24

08 Feb '24

context: https://bugs.winehq.org/show_bug.cgi?id=55897 While implementing CopyFile2, I noticed that CopyFileEx does not respect the progress callback and never calls it. The tests too assume that it will not be invoked other than in the case of a file having multiple streams, which is not something that Wine supports. There seem to have been multiple efforts to implement this functionality (in 2022 and 2013) but I can't tell find any reasoning for why they were not successful. Would implementing this be a desirable contribution? I don't know how to get assigned to an issue on Bugzilla. I read the Wine Developers Wiki but it doesn't seem to have the information, so I left a comment in the bug log itself.

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Re: [RFC PATCH v2 19/29] selftests: ntsync: Add some tests for NTSYNC_IOC_WAIT_ANY.
by Elizabeth Figura 03 Feb '24

03 Feb '24

On Wednesday, 31 January 2024 02:52:11 CST Andi Kleen wrote: > Elizabeth Figura <zfigura(a)codeweavers.com> writes: > > > +TEST(test_wait_any) > > +{ > > + struct ntsync_mutex_args mutex_args = {0}; > > + struct ntsync_wait_args wait_args = {0}; > > + struct ntsync_sem_args sem_args = {0}; > > + __u32 owner, index, count; > > + struct timespec timeout; > > + int objs[2], fd, ret; > > + > > + clock_gettime(CLOCK_MONOTONIC, &timeout); > > + > > + fd = open("/dev/ntsync", O_CLOEXEC | O_RDONLY); > > + ASSERT_LE(0, fd); > > + > > + sem_args.count = 2; > > + sem_args.max = 3; > > + sem_args.sem = 0xdeadbeef; > > + ret = ioctl(fd, NTSYNC_IOC_CREATE_SEM, &sem_args); > > + EXPECT_EQ(0, ret); > > + EXPECT_NE(0xdeadbeef, sem_args.sem); > > + > > + mutex_args.owner = 0; > > + mutex_args.count = 0; > > + mutex_args.mutex = 0xdeadbeef; > > + ret = ioctl(fd, NTSYNC_IOC_CREATE_MUTEX, &mutex_args); > > + EXPECT_EQ(0, ret); > > + EXPECT_NE(0xdeadbeef, mutex_args.mutex); > > It seems your tests are missing test cases for exceeding any limits, > especially overflow/underflow cases. Since these are the most likely > for any security problems it would be good to have extra coverage here. > The fuzzers will hopefully hit it too. > > Also some stress testing with multiple threads would be useful. Thanks, I'll add these.

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Upcoming vkd3d 1.11 release
by Henri Verbeet 01 Feb '24

01 Feb '24

Hi all, The tentative release date for vkd3d 1.11 is March 5. As usual, that means the development branch will become increasingly frozen as we're nearing release. In particular, the public API should be considered frozen after February 6, and we'll only accept targetted fixes after February 20. If you're an upstream vkd3d developer, please do the following: - Keep an eye on Bugzilla for any reported regressions. - Review any API changes since the previous release. - Verify all the vkd3d tests pass on your hardware, and please send fixes if they don't. - Review and improve the documentation. - Apply your best judgment about which patches are appropriate for the current stage of the release process. If you're a downstream user of vkd3d, please test your applications for regressions, and file bug reports if you find any. If you're the maintainer of a Wine module that (indirectly) depends on vkd3d, like e.g. d2d1, d3dx9, d3dcompiler, or any of the core Direct3D modules, that includes making sure the unit tests still pass with the new version. The planned release date for vkd3d 1.12 is currently May 28. Regards, Henri

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[RFC PATCH v2 00/29] NT synchronization primitive driver
by Elizabeth Figura 31 Jan '24

31 Jan '24

This patch series introduces a new char misc driver, /dev/ntsync, which is used to implement Windows NT synchronization primitives. == Background == The Wine project emulates the Windows API in user space. One particular part of that API, namely the NT synchronization primitives, have historically been implemented via RPC to a dedicated "kernel" process. However, more recent applications use these APIs more strenuously, and the overhead of RPC has become a bottleneck. The NT synchronization APIs are too complex to implement on top of existing primitives without sacrificing correctness. Certain operations, such as NtPulseEvent() or the "wait-for-all" mode of NtWaitForMultipleObjects(), require direct control over the underlying wait queue, and implementing a wait queue sufficiently robust for Wine in user space is not possible. This proposed driver, therefore, implements the problematic interfaces directly in the Linux kernel. This driver was presented at Linux Plumbers Conference 2023. For those further interested in the history of synchronization in Wine and past attempts to solve this problem in user space, a recording of the presentation can be viewed here: https://www.youtube.com/watch?v=NjU4nyWyhU8 == Performance == The gain in performance varies wildly depending on the application in question and the user's hardware. For some games NT synchronization is not a bottleneck and no change can be observed, but for others frame rate improvements of 50 to 150 percent are not atypical. The following table lists frame rate measurements from a variety of games on a variety of hardware, taken by users Dmitry Skvortsov, FuzzyQuils, OnMars, and myself: Game Upstream ntsync improvement =========================================================================== Anger Foot 69 99 43% Call of Juarez 99.8 224.1 125% Dirt 3 110.6 860.7 678% Forza Horizon 5 108 160 48% Lara Croft: Temple of Osiris 141 326 131% Metro 2033 164.4 199.2 21% Resident Evil 2 26 77 196% The Crew 26 51 96% Tiny Tina's Wonderlands 130 360 177% Total War Saga: Troy 109 146 34% =========================================================================== == Patches == The intended semantics of the patches are broadly intended to match those of the corresponding Windows functions. For those not already familiar with the Windows functions (or their undocumented behaviour), patch 29/29 provides a detailed specification, and individual patches also include a brief description of the API they are implementing. The patches making use of this driver in Wine can be retrieved or browsed here: https://repo.or.cz/wine/zf.git/shortlog/refs/heads/ntsync5 == Implementation == Some aspects of the implementation may deserve particular comment: * In the interest of performance, each object is governed only by a single spinlock. However, NTSYNC_IOC_WAIT_ALL requires that the state of multiple objects be changed as a single atomic operation. In order to achieve this, we first take a device-wide lock ("wait_all_lock") any time we are going to lock more than one object at a time. The maximum number of objects that can be used in a vectored wait, and therefore the maximum that can be locked simultaneously, is 64. This number is NT's own limit. The acquisition of multiple spinlocks will degrade performance. This is a conscious choice, however. Wait-for-all is known to be a very rare operation in practice, especially with counts that approach the maximum, and it is the intent of the ntsync driver to optimize wait-for-any at the expense of wait-for-all as much as possible. * NT mutexes are tied to their threads on an OS level, and the kernel includes builtin support for "robust" mutexes. In order to keep the ntsync driver self-contained and avoid touching more code than necessary, it does not hook into task exit nor use pids. Instead, the user space emulator is expected to manage thread IDs and pass them as an argument to any relevant functions; this is the "owner" field of ntsync_wait_args and ntsync_mutex_args. When the emulator detects that a thread dies, it should therefore call NTSYNC_IOC_KILL_OWNER, which will mark mutexes owned by that thread (if any) as abandoned. * This implementation uses a misc device mostly because it seemed like the simplest and least obtrusive option. Besides simplicitly of implementation, the only particularly interesting advantage is the ability to create an arbitrary number of "contexts" (corresponding to Windows virtual machines) which are self-contained and shareable across multiple processes; this maps nicely to file descriptions (i.e. struct file). This is not impossible with syscalls of course but would require an extra argument. On the other hand, there is no reason to forbid using ntsync by default from user-mode processes, and (as far as I understand) to do so with a char device requires explicit configuration by e.g. udev or init. Since this is done with e.g. fuse, I assume this is the model to follow, but I may have chosen something deprecated. * ntsync is module-capable mostly because there was nothing preventing it, and because it aided development. It is not a hard requirement, though. == Previous versions == Changes in v2: * Send the whole series instead of just the first few patches. * Try to add more description to each patch, as a short documentation of the functions to be implemented. A more complete documentation of all aspects of the driver is provided in the contents of the last patch. * Objects are now files rather than indices into a table. This prevents a process from changing the state of an object which it should not have access to. Suggested by Andy Lutorminski. * Because the device no longer inherently has a table of all objects, marking a thread's owned mutexes as abandoned is now done through an ioctl on the mutex. * Change the names of a couple ioctls to be a bit less odd (PUT_SEM -> SEM_POST, PUT_MUTEX -> MUTEX_UNLOCK), and to reflect that they are ioctls on an object rather than on the device. * Pass the timeout for wait functions as a bare u64 (in ns), per Arnd Bergmann, with U64_MAX used to indicate no timeout. I originally indicated that I would change the timeout to be relative, but on reflection ended up keeping it as absolute, as this results in the least number of calls to get the current time (i.e. one). * Use compat_ptr_ioctl(), per Arnd Bergmann. * Remove the fixed minor number and module alias, per Greg Kroah-Hartman. * Allocate the fds array on stack in setup_wait(). This array takes up 260 bytes. * Link to v1: https://lore.kernel.org/lkml/20240124004028.16826-1-zfigura@codeweavers.com/ Elizabeth Figura (29): ntsync: Introduce the ntsync driver and character device. ntsync: Introduce NTSYNC_IOC_CREATE_SEM. ntsync: Introduce NTSYNC_IOC_SEM_POST. ntsync: Introduce NTSYNC_IOC_WAIT_ANY. ntsync: Introduce NTSYNC_IOC_WAIT_ALL. ntsync: Introduce NTSYNC_IOC_CREATE_MUTEX. ntsync: Introduce NTSYNC_IOC_MUTEX_UNLOCK. ntsync: Introduce NTSYNC_IOC_MUTEX_KILL. ntsync: Introduce NTSYNC_IOC_CREATE_EVENT. ntsync: Introduce NTSYNC_IOC_EVENT_SET. ntsync: Introduce NTSYNC_IOC_EVENT_RESET. ntsync: Introduce NTSYNC_IOC_EVENT_PULSE. ntsync: Introduce NTSYNC_IOC_SEM_READ. ntsync: Introduce NTSYNC_IOC_MUTEX_READ. ntsync: Introduce NTSYNC_IOC_EVENT_READ. ntsync: Introduce alertable waits. selftests: ntsync: Add some tests for semaphore state. selftests: ntsync: Add some tests for mutex state. selftests: ntsync: Add some tests for NTSYNC_IOC_WAIT_ANY. selftests: ntsync: Add some tests for NTSYNC_IOC_WAIT_ALL. selftests: ntsync: Add some tests for wakeup signaling with WINESYNC_IOC_WAIT_ANY. selftests: ntsync: Add some tests for wakeup signaling with WINESYNC_IOC_WAIT_ALL. selftests: ntsync: Add some tests for manual-reset event state. selftests: ntsync: Add some tests for auto-reset event state. selftests: ntsync: Add some tests for wakeup signaling with events. selftests: ntsync: Add tests for alertable waits. selftests: ntsync: Add some tests for wakeup signaling via alerts. maintainers: Add an entry for ntsync. docs: ntsync: Add documentation for the ntsync uAPI. Documentation/userspace-api/index.rst | 1 + .../userspace-api/ioctl/ioctl-number.rst | 2 + Documentation/userspace-api/ntsync.rst | 390 +++++ MAINTAINERS | 9 + drivers/misc/Kconfig | 9 + drivers/misc/Makefile | 1 + drivers/misc/ntsync.c | 1132 ++++++++++++++ include/uapi/linux/ntsync.h | 58 + tools/testing/selftests/Makefile | 1 + .../testing/selftests/drivers/ntsync/Makefile | 8 + tools/testing/selftests/drivers/ntsync/config | 1 + .../testing/selftests/drivers/ntsync/ntsync.c | 1300 +++++++++++++++++ 12 files changed, 2912 insertions(+) create mode 100644 Documentation/userspace-api/ntsync.rst create mode 100644 drivers/misc/ntsync.c create mode 100644 include/uapi/linux/ntsync.h create mode 100644 tools/testing/selftests/drivers/ntsync/Makefile create mode 100644 tools/testing/selftests/drivers/ntsync/config create mode 100644 tools/testing/selftests/drivers/ntsync/ntsync.c -- 2.43.0

1 29

The future of WineConf
by Alexandre Julliard 27 Jan '24

27 Jan '24

Folks, As you may have noticed, we haven't been making any plans for WineConf this year. Jeremy has been busy preparing his retirement, and I haven't been pushing it either, mostly because I'm not convinced that we want to continue the traditional WineConf model. Even though we skipped a few years because of the pandemic, attendance at last year's WineConf wasn't great. We also suggested meeting at FOSDEM in February, like we did in previous years, but essentially no one showed up. So I'm wondering whether there is still enough interest for a traditional WineConf, or whether we should try a different approach, to maybe capture some of the recent excitement around gaming and downstream uses of Wine in general. I'd like to hear your thoughts. Should we do a Proton conference, or join some kind of gaming-related event? Do people even want to travel to conferences anymore? What kind of event would you be interested in, particularly those of you who don't show up to the traditional WineConf? -- Alexandre Julliard julliard(a)winehq.org

14 19

Wine staging 9.1 release
by Alistair Leslie-Hughes 27 Jan '24

27 Jan '24

Binary packages for various distributions will be available from: https://www.winehq.org/download Summary since last release * Rebased to current wine 9.1 (508 patches are applied to wine vanilla) Upstreamed (Either directly from staging or fixed with a similar patch). * include: Add more D3D_FEATURE_LEVEL_ defines. * oleaut32: Do not reimplement OleLoadPicture in OleLoadPicturePath. * oleaut32: Factor out stream creation from OleLoadPicturePath. * oleaut32: Implement OleLoadPictureFile. (v2) * user32/tests: Add tests for clicking through layered window. * user32/tests: Add tests for window region of layered windows. Added: * [50148] msi: Process cabinet files only when one is supplied. * [51965] msxml3: IMXWrite::output to support DOMDocument. * [52128] scrrun: Implement IFileSystem3 MoveFolder. Updated: * vkd3d-latest * user32-Mouse_Message_Hwnd (Rebased and enabled) * wined3d-bindless-texture (Rebased and enabled) * ddraw-version-check (Rebased and enabled) * vcomp_for_dynamic_init_i8 Where can you help * Run Steam/Battle.net/GOG/UPlay/Epic * Test your favorite game. * Test your favorite applications. * Improve staging patches and get them accepted upstream. * Suggest patches to be included in staging. As always, if you find a bug, please report it via https://bugs.winehq.org Best Regards Alistair.

1 0

Staging patchset update
by DodoGTA GT 27 Jan '24

27 Jan '24

Hello, I just updated the vkd3d-latest staging patchset with the latest vkd3d commit (attached below) Hopefully someone can push this to wine-staging Thanks, Aida/Echo (DodoGTA)

2 1

[RFC PATCH 0/9] NT synchronization primitive driver
by Elizabeth Figura 25 Jan '24

25 Jan '24

This patch series introduces a new char misc driver, /dev/ntsync, which is used to implement Windows NT synchronization primitives. == Background == The Wine project emulates the Windows API in user space. One particular part of that API, namely the NT synchronization primitives, have historically been implemented via RPC to a dedicated "kernel" process. However, more recent applications use these APIs more strenuously, and the overhead of RPC has become a bottleneck. The NT synchronization APIs are too complex to implement on top of existing primitives without sacrificing correctness. Certain operations, such as NtPulseEvent() or the "wait-for-all" mode of NtWaitForMultipleObjects(), require direct control over the underlying wait queue, and implementing a wait queue sufficiently robust for Wine in user space is not possible. This proposed driver, therefore, implements the problematic interfaces directly in the Linux kernel. This driver was presented at Linux Plumbers Conference 2023. For those further interested in the history of synchronization in Wine and past attempts to solve this problem in user space, a recording of the presentation can be viewed here: https://www.youtube.com/watch?v=NjU4nyWyhU8 == Performance == The gain in performance varies wildly depending on the application in question and the user's hardware. For some games NT synchronization is not a bottleneck and no change can be observed, but for others frame rate improvements of 50 to 150 percent are not atypical. The following table lists frame rate measurements from a variety of games on a variety of hardware, taken by users Dmitry Skvortsov, FuzzyQuills, OnMars, and myself: Game Upstream ntsync improvement =========================================================================== Anger Foot 69 99 43% Call of Juarez 99.8 224.1 125% Dirt 3 110.6 860.7 678% Forza Horizon 5 108 160 48% Lara Croft: Temple of Osiris 141 326 131% Metro 2033 164.4 199.2 21% Resident Evil 2 26 77 196% The Crew 26 51 96% Tiny Tina's Wonderlands 130 360 177% Total War Saga: Troy 109 146 34% =========================================================================== == Patches == This is the first part of a 32-patch series. The series comprises 17 patches which contain the actual implementation, 13 which provide self-tests, 1 to update the MAINTAINERS file, and 1 to add API documentation. The intended semantics of the patches are broadly intended to match those of the corresponding Windows functions. Since I do not expect familiarity with Windows syscalls, however, and especially not with some of the more subtle or unspecified behaviour that they provide, the documentation patch included in the series also describes the intended behaviour in detail, and can be used as a specification for the rest of the series. The entire series can be retrieved or browsed here: https://repo.or.cz/linux/zf.git/shortlog/refs/heads/ntsync4 The patches making use of this driver in Wine can be retrieved or browsed here: https://repo.or.cz/wine/zf.git/shortlog/refs/heads/ntsync4 == Implementation == Some aspects of the implementation may deserve particular comment: * In the interest of performance, each object is governed only by a single spinlock. However, NTSYNC_IOC_WAIT_ALL requires that the state of multiple objects be changed as a single atomic operation. In order to achieve this, we first take a device-wide lock ("wait_all_lock") any time we are going to lock more than one object at a time. The maximum number of objects that can be used in a vectored wait, and therefore the maximum that can be locked simultaneously, is 64. This number is NT's own limit. The acquisition of multiple spinlocks will degrade performance. This is a conscious choice, however. Wait-for-all is known to be a very rare operation in practice, especially with counts that approach the maximum, and it is the intent of the ntsync driver to optimize the wait-for-any pattern at the expense of the wait-for-all pattern as much as possible. * NT mutexes are tied to their threads on an OS level, and the kernel includes builtin support for "robust" mutexes. In order to keep the ntsync driver self-contained and avoid touching more code than necessary, it does not hook into task exit nor use pids. Instead, the user space emulator is expected to manage thread IDs and pass them as an argument to any relevant functions; this is the "owner" field of ntsync_wait_args and ntsync_mutex_args. When the emulator detects that a thread dies, it should therefore call NTSYNC_IOC_KILL_OWNER, which will mark mutexes owned by that thread (if any) as abandoned. * This implementation uses a misc device mostly because it seemed like the simplest and least obtrusive option. Besides simplicitly of implementation, the only particularly interesting advantage is the ability to create an arbitrary number of "contexts" (corresponding to Windows virtual machines) which are self-contained and shareable across multiple processes; this maps nicely to file descriptions (i.e. struct file). This is not impossible with syscalls of course but would require an extra argument. On the other hand, there is no reason to forbid using ntsync by default from user-mode processes, and (as far as I understand) to do so with a char device requires explicit configuration by e.g. udev or init. Since this is done with e.g. fuse, I assume this is the model to follow, but I may have chosen something deprecated. * ntsync is module-capable mostly because there was nothing preventing it, and because it aided development. I am not aware of any reason why being a module is required, though. * The misc minor number has not been reserved with LANANA. I am not sure at what point in the process this makes the most sense, but since this is still only an RFC I've abstained from doing so yet. Elizabeth Figura (9): ntsync: Introduce the ntsync driver and character device. ntsync: Reserve a minor device number and ioctl range. ntsync: Introduce NTSYNC_IOC_CREATE_SEM and NTSYNC_IOC_DELETE. ntsync: Introduce NTSYNC_IOC_PUT_SEM. ntsync: Introduce NTSYNC_IOC_WAIT_ANY. ntsync: Introduce NTSYNC_IOC_WAIT_ALL. ntsync: Introduce NTSYNC_IOC_CREATE_MUTEX. ntsync: Introduce NTSYNC_IOC_PUT_MUTEX. ntsync: Introduce NTSYNC_IOC_KILL_OWNER. Documentation/admin-guide/devices.txt | 3 +- .../userspace-api/ioctl/ioctl-number.rst | 2 + drivers/misc/Kconfig | 9 + drivers/misc/Makefile | 1 + drivers/misc/ntsync.c | 916 ++++++++++++++++++ include/linux/miscdevice.h | 1 + include/uapi/linux/ntsync.h | 53 + 7 files changed, 984 insertions(+), 1 deletion(-) create mode 100644 drivers/misc/ntsync.c create mode 100644 include/uapi/linux/ntsync.h base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d -- 2.43.0

3 15

Re: [RFC PATCH 5/9] ntsync: Introduce NTSYNC_IOC_WAIT_ANY.
by Elizabeth Figura 25 Jan '24

25 Jan '24

On Thursday, 25 January 2024 11:02:26 CST Arnd Bergmann wrote: > On Wed, Jan 24, 2024, at 23:28, Elizabeth Figura wrote: > > On Wednesday, 24 January 2024 13:52:52 CST Arnd Bergmann wrote: > >> On Wed, Jan 24, 2024, at 19:02, Elizabeth Figura wrote: > >> > That'd be nicer in general. I think there was some documentation that > >> > advised using timespec64 for new ioctl interfaces but it may have been > >> > outdated or misread. > >> > >> It's probably something I wrote. It depends a bit on > >> whether you have an absolute or relative timeout. If > >> the timeout is relative to the current time as I understand > >> it is here, a 64-bit number seems more logical to me. > >> > >> For absolute times, I would usually use a __kernel_timespec, > >> especially if it's CLOCK_REALTIME. In this case you would > >> also need to specify the time domain. > > > > Currently the interface does pass it as an absolute time, with the > > domain implicitly being MONOTONIC. This particular choice comes from > > process/botching-up-ioctls.rst, which is admittedly focused around GPU > > ioctls, but the rationale of having easily restartable ioctls applies > > here too. > > Ok, I was thinking of Documentation/driver-api/ioctl.rst, which > has similar recommendations. > > > (E.g. Wine does play games with signals, so we do want to be able to > > interrupt arbitrary waits with EINTR. The "usual" fast path for ntsync > > waits won't hit that, but we want to have it work.) > > > > On the other hand, if we can pass the timeout as relative, and write it > > back on exit like ppoll() does [assuming that's not proscribed], that > > would presumably be slightly better for performance. > > I've seen arguments go either way between absolute and relative > times, just pick whatever works best for you here. > > > When writing the patch I just picked the recommended option, and didn't > > bother doing any micro-optimizations afterward. > > > > What's the rationale for using timespec for absolute or written-back > > timeouts, instead of dealing in ns directly? I'm afraid it's not > > obvious to me. > > There is no hard rule either way, I mainly didn't like the > indirect pointer to the timespec that you have here. For > traditional unix-style interfaces, a timespec with CLOCK_REALTIME > times usually makes sense since that is what user space is > already using elsewhere, but you probably don't need to > worry about that. In theory, the single u64 CLOCK_REALTIME > nanoseconds have the problem of no longer working after year > 2262, but with CLOCK_MONOTONIC that is not a concern anyway. > > Between embedding a __u64 nanosecond value and embedding > a __kernel_timespec, I would pick whichever avoids converting > a __u64 back into a timespec, as that is an expensive > operation at least on 32-bit code. Makes sense. I'll probably switch to using a relative and written-back u64 then, thanks!

1 0

Re: [RFC PATCH 1/9] ntsync: Introduce the ntsync driver and character device.
by Elizabeth Figura 25 Jan '24

25 Jan '24

On Thursday, 25 January 2024 10:47:49 CST Arnd Bergmann wrote: > On Thu, Jan 25, 2024, at 04:42, Elizabeth Figura wrote: > > On Wednesday, 24 January 2024 16:56:23 CST Elizabeth Figura wrote: > >> On Wednesday, 24 January 2024 15:26:15 CST Andy Lutomirski wrote: > >> > On Tue, Jan 23, 2024 at 4:59 PM Elizabeth Figura <zfigura(a)codeweavers.com> wrote: > >> [There is also a potential problem where some broken applications > >> create a million (literally) sync objects. Making these into files runs > >> into NOFILE. We did specifically push distributions and systemd to > >> increase those limits because an older solution *did* use eventfds and > >> *did* run into those limits. Since that push was successful I don't > >> know if this is *actually* a concern anymore, but avoiding files is > >> probably not a bad thing either.] > > > > Of course, looking at it from a kernel maintainer's perspective, it > > wouldn't be insane to do this anyway. If we at some point do start to > > care about cross- process isolation in this way, or if another NT > > emulator wants to use this interface and does care about cross-process > > isolation, it'll be necessary. At least it'd make sense to make them > > separate files even if we don't implement granular permission handling > > just yet. > > I can think of a few other possible benefits of going with > per-mutex file descriptors: > > - being able to use poll() for waiting on them individually in > combination with other file descriptor based events (socket, > signalfd, pidfd, ...) I can say for sure this isn't going to be useful for Wine, at least not with the current design. It also doesn't really mesh well with the NT design in the first place. NTSYNC_IOC_WAIT_ANY differs from poll() in two major ways: it consumes state of most object types, and (as coded here) it needs the owner thread ID to be specifically passed for mutexes. Anyway, as Alexandre has informed me I clearly have misunderstood our requirements, so I'm going to try to put together something using files instead.

1 0

Re: [RFC PATCH 5/9] ntsync: Introduce NTSYNC_IOC_WAIT_ANY.
by Elizabeth Figura 24 Jan '24

24 Jan '24

On Wednesday, 24 January 2024 13:52:52 CST Arnd Bergmann wrote: > On Wed, Jan 24, 2024, at 19:02, Elizabeth Figura wrote: > > On Wednesday, 24 January 2024 01:56:52 CST Arnd Bergmann wrote: > >> On Wed, Jan 24, 2024, at 01:40, Elizabeth Figura wrote: > >> > >> > + if (args->timeout) { > >> > + struct timespec64 to; > >> > + > >> > + if (get_timespec64(&to, u64_to_user_ptr(args->timeout))) > >> > + return -EFAULT; > >> > + if (!timespec64_valid(&to)) > >> > + return -EINVAL; > >> > + > >> > + timeout = timespec64_to_ns(&to); > >> > + } > >> > >> Have you considered just passing the nanosecond value here? > >> Since you do not appear to write it back, that would avoid > >> the complexities of dealing with timespec layout differences > >> and indirection. > > > > That'd be nicer in general. I think there was some documentation that advised > > using timespec64 for new ioctl interfaces but it may have been outdated or > > misread. > > It's probably something I wrote. It depends a bit on > whether you have an absolute or relative timeout. If > the timeout is relative to the current time as I understand > it is here, a 64-bit number seems more logical to me. > > For absolute times, I would usually use a __kernel_timespec, > especially if it's CLOCK_REALTIME. In this case you would > also need to specify the time domain. Currently the interface does pass it as an absolute time, with the domain implicitly being MONOTONIC. This particular choice comes from process/botching-up-ioctls.rst, which is admittedly focused around GPU ioctls, but the rationale of having easily restartable ioctls applies here too. (E.g. Wine does play games with signals, so we do want to be able to interrupt arbitrary waits with EINTR. The "usual" fast path for ntsync waits won't hit that, but we want to have it work.) On the other hand, if we can pass the timeout as relative, and write it back on exit like ppoll() does [assuming that's not proscribed], that would presumably be slightly better for performance. When writing the patch I just picked the recommended option, and didn't bother doing any micro-optimizations afterward. What's the rationale for using timespec for absolute or written-back timeouts, instead of dealing in ns directly? I'm afraid it's not obvious to me. --Zeb

1 0

Re: [RFC PATCH 8/9] ntsync: Introduce NTSYNC_IOC_PUT_MUTEX.
by Elizabeth Figura 24 Jan '24

24 Jan '24

On Wednesday, 24 January 2024 01:42:19 CST Arnd Bergmann wrote: > On Wed, Jan 24, 2024, at 01:40, Elizabeth Figura wrote: > > @@ -738,6 +803,8 @@ static long ntsync_char_ioctl(struct file *file, > > diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h > > index 26d1b3d4847f..2e44e7e77776 100644 > > --- a/include/uapi/linux/ntsync.h > > +++ b/include/uapi/linux/ntsync.h > > @@ -46,5 +46,7 @@ struct ntsync_wait_args { > > struct ntsync_wait_args) > > #define NTSYNC_IOC_CREATE_MUTEX _IOWR(NTSYNC_IOC_BASE, 5, \ > > struct ntsync_mutex_args) > > +#define NTSYNC_IOC_PUT_MUTEX _IOWR(NTSYNC_IOC_BASE, 6, \ > > + struct ntsync_mutex_args) > > > > In your implementation, this argument is not written back to > user space, so I think this should be _IOW rather than than _IORW. > > Again, no practical difference here. Hm, but there is a put_user() at the end of the function, or am I missing something?

1 0

Re: [RFC PATCH 5/9] ntsync: Introduce NTSYNC_IOC_WAIT_ANY.
by Elizabeth Figura 24 Jan '24

24 Jan '24

On Wednesday, 24 January 2024 01:56:52 CST Arnd Bergmann wrote: > On Wed, Jan 24, 2024, at 01:40, Elizabeth Figura wrote: > > > + if (args->timeout) { > > + struct timespec64 to; > > + > > + if (get_timespec64(&to, u64_to_user_ptr(args->timeout))) > > + return -EFAULT; > > + if (!timespec64_valid(&to)) > > + return -EINVAL; > > + > > + timeout = timespec64_to_ns(&to); > > + } > > Have you considered just passing the nanosecond value here? > Since you do not appear to write it back, that would avoid > the complexities of dealing with timespec layout differences > and indirection. That'd be nicer in general. I think there was some documentation that advised using timespec64 for new ioctl interfaces but it may have been outdated or misread. > > > + ids = kmalloc_array(count, sizeof(*ids), GFP_KERNEL); > > + if (!ids) > > + return -ENOMEM; > > + if (copy_from_user(ids, u64_to_user_ptr(args->objs), > > + array_size(count, sizeof(*ids)))) { > > + kfree(ids); > > + return -EFAULT; > > + } > > This looks like memdup_user() would be slightly simpler. That's useful, thanks.

1 0

Re: [RFC PATCH 2/9] ntsync: Reserve a minor device number and ioctl range.
by Elizabeth Figura 24 Jan '24

24 Jan '24

On Wednesday, 24 January 2024 06:32:13 CST Greg Kroah-Hartman wrote: > On Tue, Jan 23, 2024 at 09:43:09PM -0600, Elizabeth Figura wrote: > > > Why do you need a fixed minor number? Can't your userspace handle > > > dynamic numbers? What systems require a static value? > > > > I believe I added this because it's necessary for MODULE_ALIAS (and, more > > broadly, because I was following the example of vaguely comparable devices > > like /dev/loop-control). I suppose I could instead just remove MODULE_ALIAS > > (or even remove the ability to compile ntsync as a module entirely). > > Do you really need MODULE_ALIAS()? Having it for char devices to be > auto-loaded is not generally considered a good idea anymore as systems > should have the module loaded before userspace goes and asks for it. > > It also reduces suprises when any random userspace program can cause > kernel modules to be loaded for no real reason. I think there's no reason we can't make loading the system's problem. I'll remove it in v2.

1 0

Re: [RFC PATCH 1/9] ntsync: Introduce the ntsync driver and character device.
by Elizabeth Figura 24 Jan '24

24 Jan '24

On Wednesday, 24 January 2024 01:38:52 CST Arnd Bergmann wrote: > On Wed, Jan 24, 2024, at 01:40, Elizabeth Figura wrote: > > ntsync uses a misc device as the simplest and least intrusive uAPI interface. > > > > Each file description on the device represents an isolated NT instance, intended > > to correspond to a single NT virtual machine. > > > > Signed-off-by: Elizabeth Figura <zfigura(a)codeweavers.com> > > I'm looking at the ioctl interface to ensure it's well-formed. > > Your patches look ok from that perspective, but there are a > few minor things I would check for consistency here: > > > + > > +static const struct file_operations ntsync_fops = { > > + .owner = THIS_MODULE, > > + .open = ntsync_char_open, > > + .release = ntsync_char_release, > > + .unlocked_ioctl = ntsync_char_ioctl, > > + .compat_ioctl = ntsync_char_ioctl, > > + .llseek = no_llseek, > > +}; > > The .compat_ioctl pointer should point to compat_ptr_ioctl() > since the actual ioctl commands all take pointers instead > of interpreting the argument as a number. > > On x86 and arm64 this won't make a difference as compat_ptr() > is a nop. Thanks; will fix.

1 0

Re: [RFC PATCH 2/9] ntsync: Reserve a minor device number and ioctl range.
by Elizabeth Figura 24 Jan '24

24 Jan '24

On Tuesday, 23 January 2024 18:54:02 CST Greg Kroah-Hartman wrote: > On Tue, Jan 23, 2024 at 06:40:21PM -0600, Elizabeth Figura wrote: > > Signed-off-by: Elizabeth Figura <zfigura(a)codeweavers.com> > > --- > > Note, we can't take patches without any changelog text, and you don't > want us to :) > > > Documentation/admin-guide/devices.txt | 3 ++- > > Documentation/userspace-api/ioctl/ioctl-number.rst | 2 ++ > > drivers/misc/ntsync.c | 3 ++- > > include/linux/miscdevice.h | 1 + > > 4 files changed, 7 insertions(+), 2 deletions(-) > > > > diff --git a/Documentation/admin-guide/devices.txt > > b/Documentation/admin-guide/devices.txt index 94c98be1329a..041404397ee5 > > 100644 > > --- a/Documentation/admin-guide/devices.txt > > +++ b/Documentation/admin-guide/devices.txt > > @@ -376,8 +376,9 @@ > > > > 240 = /dev/userio Serio driver testing device > > 241 = /dev/vhost-vsock Host kernel driver for virtio vsock > > 242 = /dev/rfkill Turning off radio transmissions (rfkill) > > > > + 243 = /dev/ntsync NT synchronization primitive device > > > > - 243-254 Reserved for local use > > + 244-254 Reserved for local use > > Why do you need a fixed minor number? Can't your userspace handle > dynamic numbers? What systems require a static value? I believe I added this because it's necessary for MODULE_ALIAS (and, more broadly, because I was following the example of vaguely comparable devices like /dev/loop-control). I suppose I could instead just remove MODULE_ALIAS (or even remove the ability to compile ntsync as a module entirely). It's a bit difficult to figure out what's the preferred way to organize things like this (there not being a lot of precedent for this kind of driver) so I'd appreciate any direction. --Zeb

1 0

Re: [RFC PATCH 3/9] ntsync: Introduce NTSYNC_IOC_CREATE_SEM and NTSYNC_IOC_DELETE.
by Elizabeth Figura 24 Jan '24

24 Jan '24

On Tuesday, 23 January 2024 19:14:17 CST Greg Kroah-Hartman wrote: > On Tue, Jan 23, 2024 at 06:40:22PM -0600, Elizabeth Figura wrote: > > +static int ntsync_create_sem(struct ntsync_device *dev, void __user > > *argp) > > +{ > > + struct ntsync_sem_args __user *user_args = argp; > > + struct ntsync_sem_args args; > > + struct ntsync_obj *sem; > > + __u32 id; > > + int ret; > > + > > + if (copy_from_user(&args, argp, sizeof(args))) > > + return -EFAULT; > > + > > + if (args.count > args.max) > > + return -EINVAL; > > No bounds checking on count or max? > > What's the relationship between count and max? Indeed, no bounds checking. The counter is just the semaphore's internal value and has no meaning other than that. It's basically like an EFD_SEMAPHORE, except that the maximum is configurable rather than always being 2**64-2. > Some sort of real > documentation is needed here, the changelog needs to explain this. Or > somewhere, but as-is, this patch series is pretty unreviewable as I > can't figure out how to review it because I don't know what it wants to > do. There is some comprehensive documentation in the series, but for ease of review I will try to write a basic description of the API in each relevant patch in v2.

1 0

Re: [RFC PATCH 0/9] NT synchronization primitive driver
by Elizabeth Figura 24 Jan '24

24 Jan '24

On Tuesday, 23 January 2024 18:59:35 CST Greg Kroah-Hartman wrote: > On Tue, Jan 23, 2024 at 06:40:19PM -0600, Elizabeth Figura wrote: > > == Patches == > > > > This is the first part of a 32-patch series. The series comprises 17 patches > > which contain the actual implementation, 13 which provide self-tests, 1 to > > update the MAINTAINERS file, and 1 to add API documentation. > > 32 patches? I only see 9 here, why not submit them all? Because Documentation/process/submitting-patches.rst makes a point of asking people not to submit large patch series (and it matches the expectation of other projects I've worked with—that patches would be submitted and reviewed a few at a time). I suppose I've misunderstood that advice, though. I'll resend with the entire series. Sorry for the noise.

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