From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:53530) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eZdkX-0001uP-D4 for qemu-devel@nongnu.org; Thu, 11 Jan 2018 09:22:35 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eZdkR-0004F9-FD for qemu-devel@nongnu.org; Thu, 11 Jan 2018 09:22:33 -0500 Received: from mga03.intel.com ([134.134.136.65]:53608) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1eZdkR-0004Bw-4d for qemu-devel@nongnu.org; Thu, 11 Jan 2018 09:22:27 -0500 From: Haozhong Zhang Date: Thu, 11 Jan 2018 22:22:06 +0800 Message-Id: <20180111142208.17617-1-haozhong.zhang@intel.com> Subject: [Qemu-devel] [PATCH v2 0/2] nvdimm: support MAP_SYNC for memory-backend-file List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Eduardo Habkost , Igor Mammedov , Paolo Bonzini , mst@redhat.com, Xiao Guangrong , Stefan Hajnoczi , Dan Williams , Haozhong Zhang v2 is based on Eduardo's machine-next tree. Changes of memory-backend-file are based on my previous patches in that tree. Linux 4.15 introduces a new mmap flag MAP_SYNC, which can be used to guarantee the write persistence to mmap'ed files supporting DAX (e.g., files on ext4/xfs file system mounted with '-o dax'). This patchset enables QEMU to use MAP_SYNC flag for memory-backend-file, in order to guarantee the guest write persistence to backend files supporting DAX. A new auto on/off option 'sync' is added to memory-backend-file: - on: try to pass MAP_SYNC to mmap(2); if MAP_SYNC is not supported or 'share=off', QEMU will abort - off: never pass MAP_SYNC to mmap(2) - auto (default): if MAP_SYNC is supported and 'share=on', work as if 'sync=on'; otherwise, work as if 'sync=off' Changes in v2: * Add 'sync' option to control the use of MAP_SYNC. (Eduardo Habkost) * Remove the unnecessary set of MAP_SHARED_VALIDATE in some cases and the retry mechanism in qemu_ram_mmap(). (Michael S. Tsirkin) * Move OS dependent definitions of MAP_SYNC and MAP_SHARED_VALIDATE to osdep.h. (Michael S. Tsirkin) Haozhong Zhang (2): util/mmap-alloc: support MAP_SYNC in qemu_ram_mmap() hostmem-file: add 'sync' option backends/hostmem-file.c | 39 ++++++++++++++++++++++++++++++++++++++- docs/nvdimm.txt | 15 ++++++++++++++- exec.c | 13 ++++++++----- include/exec/memory.h | 4 ++++ include/exec/ram_addr.h | 6 +++--- include/qemu/mmap-alloc.h | 3 ++- include/qemu/osdep.h | 16 ++++++++++++++++ memory.c | 6 ++++-- numa.c | 2 +- qemu-options.hx | 21 ++++++++++++++++++++- util/mmap-alloc.c | 24 ++++++++++++++++++++++-- util/oslib-posix.c | 2 +- 12 files changed, 133 insertions(+), 18 deletions(-) -- 2.15.1