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Fri, 24 Jan 2025 23:55:21 GMT Received: from pps.reinject (localhost [127.0.0.1]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 44917u4a92-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 24 Jan 2025 23:55:21 +0000 Received: from phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 50ONsxPq018051; Fri, 24 Jan 2025 23:55:20 GMT Received: from localhost.us.oracle.com (dhcp-10-65-130-174.vpn.oracle.com [10.65.130.174]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTP id 44917u49ww-6; Fri, 24 Jan 2025 23:55:19 +0000 From: Anthony Yznaga To: akpm@linux-foundation.org, willy@infradead.org, markhemm@googlemail.com, viro@zeniv.linux.org.uk, david@redhat.com, khalid@kernel.org Cc: anthony.yznaga@oracle.com, jthoughton@google.com, corbet@lwn.net, dave.hansen@intel.com, kirill@shutemov.name, luto@kernel.org, brauner@kernel.org, arnd@arndb.de, ebiederm@xmission.com, catalin.marinas@arm.com, mingo@redhat.com, peterz@infradead.org, liam.howlett@oracle.com, lorenzo.stoakes@oracle.com, vbabka@suse.cz, jannh@google.com, hannes@cmpxchg.org, mhocko@kernel.org, roman.gushchin@linux.dev, shakeel.butt@linux.dev, muchun.song@linux.dev, tglx@linutronix.de, cgroups@vger.kernel.org, x86@kernel.org, linux-doc@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhiramat@kernel.org, rostedt@goodmis.org, vasily.averin@linux.dev, xhao@linux.alibaba.com, pcc@google.com, neilb@suse.de, maz@kernel.org Subject: [PATCH 05/20] mm/mshare: Add ioctl support Date: Fri, 24 Jan 2025 15:54:39 -0800 Message-ID: <20250124235454.84587-6-anthony.yznaga@oracle.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20250124235454.84587-1-anthony.yznaga@oracle.com> References: <20250124235454.84587-1-anthony.yznaga@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-01-24_10,2025-01-23_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 phishscore=0 mlxscore=0 spamscore=0 mlxlogscore=999 bulkscore=0 malwarescore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2411120000 definitions=main-2501240162 X-Proofpoint-GUID: Z20-vg57O9zfZiKygPd_gm_amo1x_1Ej X-Proofpoint-ORIG-GUID: Z20-vg57O9zfZiKygPd_gm_amo1x_1Ej X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 9263140002 X-Stat-Signature: ao4t3ad3idgtk9qep7dxehd4ypb6f78m X-Rspam-User: X-HE-Tag: 1737762939-522018 X-HE-Meta: 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 eATP0vKa gRrkVahKmBrY83JLv3rcgkyWybThaKyP7AVoma88Zx70jm1GOUuyutgeNKfbzCBKXJIYBLyZ7jT1JqBUltyDwLNcBttpZdDolYUt/dvtOhFCkevjrafY5292pG8YMepR7niByG5xY6RChHQ5fKTzdT5WEesxw/oGHjhrn6t2Q40ravx+hZXAzdxrD7bLyRqGRF7EzxhHyP8uwo0Z3lNi7r0DV5/g7VPCpPXe98aQXfTfCpWb8jKRnYkaTbVcJMZUtkyuxewVoWNeA8LBw89YF47GPyPNol7wIJo8UyMOooSsYLgAkAHkoEcsOJSgSq11/0wU7YYj03SfRjMYSrGV/p+NLojWJSKajh+w5B3CMzYtC01k3GhyfD5PzqNwcC7mDIw+stz0/Pz0sSmhImZAMl1fS4g== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Khalid Aziz Reserve a range of ioctls for msharefs and add the first two ioctls to get and set the start address and size of an mshare region. Signed-off-by: Khalid Aziz Signed-off-by: Anthony Yznaga --- .../userspace-api/ioctl/ioctl-number.rst | 1 + include/uapi/linux/msharefs.h | 29 ++++++++ mm/mshare.c | 68 +++++++++++++++++++ 3 files changed, 98 insertions(+) create mode 100644 include/uapi/linux/msharefs.h diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst index 243f1f1b554a..aa22b5412e4d 100644 --- a/Documentation/userspace-api/ioctl/ioctl-number.rst +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst @@ -303,6 +303,7 @@ Code Seq# Include File Comments 'v' 20-27 arch/powerpc/include/uapi/asm/vas-api.h VAS API 'v' C0-FF linux/meye.h conflict! 'w' all CERN SCI driver +'x' 00-1F linux/msharefs.h msharefs filesystem 'y' 00-1F packet based user level communications 'z' 00-3F CAN bus card conflict! diff --git a/include/uapi/linux/msharefs.h b/include/uapi/linux/msharefs.h new file mode 100644 index 000000000000..c7b509c7e093 --- /dev/null +++ b/include/uapi/linux/msharefs.h @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +/* + * msharefs defines a memory region that is shared across processes. + * ioctl is used on files created under msharefs to set various + * attributes on these shared memory regions + * + * + * Copyright (C) 2024 Oracle Corp. All rights reserved. + * Author: Khalid Aziz + */ + +#ifndef _UAPI_LINUX_MSHAREFS_H +#define _UAPI_LINUX_MSHAREFS_H + +#include +#include + +/* + * msharefs specific ioctl commands + */ +#define MSHAREFS_GET_SIZE _IOR('x', 0, struct mshare_info) +#define MSHAREFS_SET_SIZE _IOW('x', 1, struct mshare_info) + +struct mshare_info { + __u64 start; + __u64 size; +}; + +#endif diff --git a/mm/mshare.c b/mm/mshare.c index 060292fb6a00..056cb5a82547 100644 --- a/mm/mshare.c +++ b/mm/mshare.c @@ -10,24 +10,91 @@ * * Copyright (C) 2024 Oracle Corp. All rights reserved. * Author: Khalid Aziz + * Author: Matthew Wilcox * */ #include #include +#include #include +#include const unsigned long mshare_align = P4D_SIZE; struct mshare_data { struct mm_struct *mm; + spinlock_t m_lock; + struct mshare_info minfo; }; +static long +msharefs_set_size(struct mm_struct *host_mm, struct mshare_data *m_data, + struct mshare_info *minfo) +{ + /* + * Validate alignment for start address and size + */ + if (!minfo->size || ((minfo->start | minfo->size) & (mshare_align - 1))) { + spin_unlock(&m_data->m_lock); + return -EINVAL; + } + + host_mm->mmap_base = minfo->start; + host_mm->task_size = minfo->size; + + m_data->minfo.start = host_mm->mmap_base; + m_data->minfo.size = host_mm->task_size; + spin_unlock(&m_data->m_lock); + + return 0; +} + +static long +msharefs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) +{ + struct mshare_data *m_data = filp->private_data; + struct mm_struct *host_mm = m_data->mm; + struct mshare_info minfo; + + switch (cmd) { + case MSHAREFS_GET_SIZE: + spin_lock(&m_data->m_lock); + minfo = m_data->minfo; + spin_unlock(&m_data->m_lock); + + if (copy_to_user((void __user *)arg, &minfo, sizeof(minfo))) + return -EFAULT; + + return 0; + + case MSHAREFS_SET_SIZE: + if (copy_from_user(&minfo, (struct mshare_info __user *)arg, + sizeof(minfo))) + return -EFAULT; + + /* + * If this mshare region has been set up once already, bail out + */ + spin_lock(&m_data->m_lock); + if (m_data->minfo.size != 0) { + spin_unlock(&m_data->m_lock); + return -EINVAL; + } + + return msharefs_set_size(host_mm, m_data, &minfo); + + default: + return -ENOTTY; + } +} + static const struct inode_operations msharefs_dir_inode_ops; static const struct inode_operations msharefs_file_inode_ops; static const struct file_operations msharefs_file_operations = { .open = simple_open, + .unlocked_ioctl = msharefs_ioctl, }; static int @@ -51,6 +118,7 @@ msharefs_fill_mm(struct inode *inode) goto err_free; } m_data->mm = mm; + spin_lock_init(&m_data->m_lock); inode->i_private = m_data; return 0;