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That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , Dan Williams , Xiao Guangrong , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" --MIdTMoZhcV1D07fI Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Jul 15, 2020 at 10:54:29AM +0800, Jingqi Liu wrote: > At the end of live migration, QEMU uses msync() to flush the data to > the backend storage. When the backend file is a character device dax, > the pages explicitly avoid the page cache. It will return failure from ms= ync(). > The following warning is output. >=20 > "warning: qemu_ram_msync: failed to sync memory range=E2=80=9C >=20 > So we add 'pmem=3Don' to avoid calling msync(), use the QEMU command line: >=20 > -object memory-backend-file,id=3Dmem1,pmem=3Don,mem-path=3D/dev/dax0.= 0,size=3D4G >=20 > Signed-off-by: Jingqi Liu > --- > docs/nvdimm.txt | 7 +++++++ > 1 file changed, 7 insertions(+) Reviewed-by: Stefan Hajnoczi --MIdTMoZhcV1D07fI Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEhpWov9P5fNqsNXdanKSrs4Grc8gFAl8hUqEACgkQnKSrs4Gr c8j6QggAlVJzvaCrpX40kqBgH8qePZEm4XucTKQn+bTGzSlm7Q1qC011LTK2NV7d rGrujdkZ3RcgbwGNC4jnX/6WpYXQXXlbikhjw3CX96G8U90J1EdaomeTuxxnUlzu j8U2hx2s2CeWZFTZosIJfDjNzC5n4crk/jVL+K/QuB/9XkHuSL1omt/59P6/MdZp oQkWp+clIrPza1smu/WGgMYQXnqQQ9NMTrhvyGnUOlvWLdrYLIRFz2gIfz8/szwu 3zB7aUsvtluv2EobSxG9CysFNvLo+gH7U2h+2pt3xXSwnWWW3hRpKqKAYpad82Y8 rb8FgiQnBXgU74cu8URXxa8O8bQviQ== =kbzP -----END PGP SIGNATURE----- --MIdTMoZhcV1D07fI--