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This provides proper synchronization for guest access to DMABufs. Virtio wayland device is given access to the DMA_BUF_SYNC ioctl in order to implement this. Being able to use this directly in the virtio wayland device process is important as these calls can sometimes be relatively expensive and they are frequent enough that avoiding another context switch is useful for good performance. TEST=cache-line artifacts no longer noticeable BUG=chromium:837209 Change-Id: Ibb8d7c01f70ed5b74afd69288015a65186fec52a Reviewed-on: https://chromium-review.googlesource.com/1076928 Commit-Ready: David Reveman <reveman@chromium.org> Tested-by: David Reveman <reveman@chromium.org> Reviewed-by: Zach Reizner <zachr@chromium.org>
53 lines
1.3 KiB
Text
53 lines
1.3 KiB
Text
# Copyright 2018 The Chromium OS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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close: 1
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dup: 1
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dup2: 1
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getpid: 1
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exit_group: 1
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futex: 1
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# Disallow mmap with PROT_EXEC set. The syntax here doesn't allow bit
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# negation, thus the manually negated mask constant.
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mmap: arg2 in 0xfffffffb
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mprotect: arg2 in 0xfffffffb
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# Allow MADV_DONTDUMP only.
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madvise: arg2 == 0x00000010
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munmap: 1
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poll: 1
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ppoll: 1
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read: 1
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recvfrom: 1
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sched_getaffinity: 1
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set_robust_list: 1
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sigaltstack: 1
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# Disallow clone's other than new threads.
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# arg0 is flags. Because kernel.
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clone: arg0 & 0x00010000
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write: 1
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eventfd2: 1
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# Used to connect to wayland. arg0 == AF_UNIX && arg1 == SOCK_STREAM|SOCK_CLOEXEC
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socket: arg0 == 1 && arg1 == 0x80001 && arg2 == 0
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# arg1 == FIONBIO || arg1 == DMA_BUF_IOCTL_SYNC
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ioctl: arg1 == 0x5421 || arg1 == 0x40086200
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connect: arg2 == 13
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# Used to communicate with wayland
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recvmsg: 1
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sendmsg: 1
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# Used for sharing memory with wayland. arg1 == MFD_CLOEXEC|MFD_ALLOW_SEALING
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memfd_create: arg1 == 3
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# Used to set of size new memfd
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ftruncate: 1
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# Used to determine shm size after recvmsg with fd
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lseek: 1
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# Allow PR_SET_NAME only.
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prctl: arg0 == 15
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restart_syscall: 1
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# Allow F_GETFL only
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fcntl: arg1 == 3
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pipe2: 1
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epoll_create1: 1
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epoll_ctl: 1
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epoll_wait: 1
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