From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrea Arcangeli Subject: [PATCH 13/21] userfaultfd: UFFDIO_COPY|UFFDIO_ZEROPAGE uAPI Date: Thu, 5 Mar 2015 18:17:56 +0100 Message-ID: <1425575884-2574-14-git-send-email-aarcange@redhat.com> References: <1425575884-2574-1-git-send-email-aarcange@redhat.com> Return-path: In-Reply-To: <1425575884-2574-1-git-send-email-aarcange@redhat.com> Sender: owner-linux-mm@kvack.org To: qemu-devel@nongnu.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-api@vger.kernel.org, Android Kernel Team Cc: "Kirill A. Shutemov" , Pavel Emelyanov , Sanidhya Kashyap , zhang.zhanghailiang@huawei.com, Linus Torvalds , Andres Lagar-Cavilla , Dave Hansen , Paolo Bonzini , Rik van Riel , Mel Gorman , Andy Lutomirski , Andrew Morton , Sasha Levin , Hugh Dickins , Peter Feiner , "Dr. David Alan Gilbert" , Christopher Covington , Johannes Weiner , Robert Love , Dmitry Adamushko List-Id: linux-api@vger.kernel.org This implements the uABI of UFFDIO_COPY and UFFDIO_ZEROPAGE. Signed-off-by: Andrea Arcangeli --- include/uapi/linux/userfaultfd.h | 46 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 45 insertions(+), 1 deletion(-) diff --git a/include/uapi/linux/userfaultfd.h b/include/uapi/linux/userfaultfd.h index 9a8cd56..61251e6 100644 --- a/include/uapi/linux/userfaultfd.h +++ b/include/uapi/linux/userfaultfd.h @@ -17,7 +17,9 @@ (__u64)1 << _UFFDIO_UNREGISTER | \ (__u64)1 << _UFFDIO_API) #define UFFD_API_RANGE_IOCTLS \ - ((__u64)1 << _UFFDIO_WAKE) + ((__u64)1 << _UFFDIO_WAKE | \ + (__u64)1 << _UFFDIO_COPY | \ + (__u64)1 << _UFFDIO_ZEROPAGE) /* * Valid ioctl command number range with this API is from 0x00 to @@ -30,6 +32,8 @@ #define _UFFDIO_REGISTER (0x00) #define _UFFDIO_UNREGISTER (0x01) #define _UFFDIO_WAKE (0x02) +#define _UFFDIO_COPY (0x03) +#define _UFFDIO_ZEROPAGE (0x04) #define _UFFDIO_API (0x3F) /* userfaultfd ioctl ids */ @@ -42,6 +46,10 @@ 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) /* * Valid bits below PAGE_SHIFT in the userfault address read through @@ -78,4 +86,40 @@ struct uffdio_register { __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; +}; + #endif /* _LINUX_USERFAULTFD_H */ -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org