From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34675) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YQfCv-0000OQ-Ic for qemu-devel@nongnu.org; Wed, 25 Feb 2015 11:53:14 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YQfCu-0001Gd-3g for qemu-devel@nongnu.org; Wed, 25 Feb 2015 11:53:09 -0500 Received: from mx1.redhat.com ([209.132.183.28]:54924) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YQfCt-0001GS-TV for qemu-devel@nongnu.org; Wed, 25 Feb 2015 11:53:08 -0500 From: "Dr. David Alan Gilbert (git)" Date: Wed, 25 Feb 2015 16:51:44 +0000 Message-Id: <1424883128-9841-22-git-send-email-dgilbert@redhat.com> In-Reply-To: <1424883128-9841-1-git-send-email-dgilbert@redhat.com> References: <1424883128-9841-1-git-send-email-dgilbert@redhat.com> Subject: [Qemu-devel] [PATCH v5 21/45] Add Linux userfaultfd header List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: aarcange@redhat.com, yamahata@private.email.ne.jp, quintela@redhat.com, amit.shah@redhat.com, pbonzini@redhat.com, yanghy@cn.fujitsu.com, david@gibson.dropbear.id.au From: "Dr. David Alan Gilbert" TODO: Update when kernel interface settles Update update-linux-headers.sh Signed-off-by: Dr. David Alan Gilbert --- linux-headers/linux/userfaultfd.h | 150 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 150 insertions(+) create mode 100644 linux-headers/linux/userfaultfd.h diff --git a/linux-headers/linux/userfaultfd.h b/linux-headers/linux/userfaultfd.h new file mode 100644 index 0000000..db6e99a --- /dev/null +++ b/linux-headers/linux/userfaultfd.h @@ -0,0 +1,150 @@ +/* + * include/linux/userfaultfd.h + * + * Copyright (C) 2007 Davide Libenzi + * Copyright (C) 2015 Red Hat, Inc. + * + */ + +#ifndef _LINUX_USERFAULTFD_H +#define _LINUX_USERFAULTFD_H + +#define UFFD_API ((__u64)0xAA) +/* FIXME: add "|UFFD_BIT_WP" to UFFD_API_BITS after implementing it */ +#define UFFD_API_BITS (UFFD_BIT_WRITE) +#define UFFD_API_IOCTLS \ + ((__u64)1 << _UFFDIO_REGISTER | \ + (__u64)1 << _UFFDIO_UNREGISTER | \ + (__u64)1 << _UFFDIO_API) +#define UFFD_API_RANGE_IOCTLS \ + ((__u64)1 << _UFFDIO_WAKE | \ + (__u64)1 << _UFFDIO_COPY | \ + (__u64)1 << _UFFDIO_ZEROPAGE | \ + (__u64)1 << _UFFDIO_REMAP) + +/* + * Valid ioctl command number range with this API is from 0x00 to + * 0x3F. UFFDIO_API is the fixed number, everything else can be + * changed by implementing a different UFFD_API. If sticking to the + * same UFFD_API more ioctl can be added and userland will be aware of + * which ioctl the running kernel implements through the ioctl command + * bitmask written by the UFFDIO_API. + */ +#define _UFFDIO_REGISTER (0x00) +#define _UFFDIO_UNREGISTER (0x01) +#define _UFFDIO_WAKE (0x02) +#define _UFFDIO_COPY (0x03) +#define _UFFDIO_ZEROPAGE (0x04) +#define _UFFDIO_REMAP (0x05) +#define _UFFDIO_API (0x3F) + +/* userfaultfd ioctl ids */ +#define UFFDIO 0xAA +#define UFFDIO_API _IOWR(UFFDIO, _UFFDIO_API, \ + struct uffdio_api) +#define UFFDIO_REGISTER _IOWR(UFFDIO, _UFFDIO_REGISTER, \ + struct uffdio_register) +#define UFFDIO_UNREGISTER _IOR(UFFDIO, _UFFDIO_UNREGISTER, \ + struct uffdio_range) +#define UFFDIO_WAKE _IOR(UFFDIO, _UFFDIO_WAKE, \ + struct uffdio_range) +#define UFFDIO_COPY _IOWR(UFFDIO, _UFFDIO_COPY, \ + struct uffdio_copy) +#define UFFDIO_ZEROPAGE _IOWR(UFFDIO, _UFFDIO_ZEROPAGE, \ + struct uffdio_zeropage) +#define UFFDIO_REMAP _IOWR(UFFDIO, _UFFDIO_REMAP, \ + struct uffdio_remap) + +/* + * Valid bits below PAGE_SHIFT in the userfault address read through + * the read() syscall. + */ +#define UFFD_BIT_WRITE (1<<0) /* this was a write fault, MISSING or WP */ +#define UFFD_BIT_WP (1<<1) /* handle_userfault() reason VM_UFFD_WP */ +#define UFFD_BITS 2 /* two above bits used for UFFD_BIT_* mask */ + +struct uffdio_api { + /* userland asks for an API number */ + __u64 api; + + /* kernel answers below with the available features for the API */ + __u64 bits; + __u64 ioctls; +}; + +struct uffdio_range { + __u64 start; + __u64 len; +}; + +struct uffdio_register { + struct uffdio_range range; +#define UFFDIO_REGISTER_MODE_MISSING ((__u64)1<<0) +#define UFFDIO_REGISTER_MODE_WP ((__u64)1<<1) + __u64 mode; + + /* + * kernel answers which ioctl commands are available for the + * range, keep at the end as the last 8 bytes aren't read. + */ + __u64 ioctls; +}; + +struct uffdio_copy { + __u64 dst; + __u64 src; + __u64 len; + /* + * There will be a wrprotection flag later that allows to map + * pages wrprotected on the fly. And such a flag will be + * available if the wrprotection ioctl are implemented for the + * range according to the uffdio_register.ioctls. + */ +#define UFFDIO_COPY_MODE_DONTWAKE ((__u64)1<<0) + __u64 mode; + + /* + * "copy" and "wake" are written by the ioctl and must be at + * the end: the copy_from_user will not read the last 16 + * bytes. + */ + __s64 copy; + __s64 wake; +}; + +struct uffdio_zeropage { + struct uffdio_range range; +#define UFFDIO_ZEROPAGE_MODE_DONTWAKE ((__u64)1<<0) + __u64 mode; + + /* + * "zeropage" and "wake" are written by the ioctl and must be + * at the end: the copy_from_user will not read the last 16 + * bytes. + */ + __s64 zeropage; + __s64 wake; +}; + +struct uffdio_remap { + __u64 dst; + __u64 src; + __u64 len; + /* + * Especially if used to atomically remove memory from the + * address space the wake on the dst range is not needed. + */ +#define UFFDIO_REMAP_MODE_DONTWAKE ((__u64)1<<0) +#define UFFDIO_REMAP_MODE_ALLOW_SRC_HOLES ((__u64)1<<1) + __u64 mode; + + /* + * "remap" and "wake" are written by the ioctl and must be at + * the end: the copy_from_user will not read the last 16 + * bytes. + */ + __s64 remap; + __s64 wake; +}; + +#endif /* _LINUX_USERFAULTFD_H */ -- 2.1.0