On Wed, Jul 18, 2018 at 03:47:56PM +0800, junyan...@gmx.com wrote: > From: Junyan He <junyan...@intel.com> > > QEMU writes to vNVDIMM backends in the vNVDIMM label emulation and live > migration. > If the backend is on the persistent memory, QEMU needs to take proper > operations to > ensure its writes persistent on the persistent memory. Otherwise, a host > power failure > may result in the loss the guest data on the persistent memory.
Ping Michael. Can this go through your tree? > > This patch series is based on Marcel's patch "mem: add share parameter to > memory-backend-ram" [1] > because of the changes in patch 1. > [1] https://lists.gnu.org/archive/html/qemu-devel/2018-02/msg03858.html > > Previous versions of this patch series can be found at: > v10: https://lists.gnu.org/archive/html/qemu-devel/2018-07/msg03433.html > v9: https://lists.gnu.org/archive/html/qemu-devel/2018-07/msg02361.html > v8: https://lists.gnu.org/archive/html/qemu-devel/2018-07/msg02279.html > v7: https://lists.gnu.org/archive/html/qemu-devel/2018-06/msg02997.html > v6: https://lists.gnu.org/archive/html/qemu-devel/2018-06/msg00061.html > v5: https://lists.gnu.org/archive/html/qemu-devel/2018-05/msg02258.html > V4: https://lists.gnu.org/archive/html/qemu-devel/2018-02/msg06993.html > v3: https://lists.gnu.org/archive/html/qemu-devel/2018-02/msg04365.html > v2: https://lists.gnu.org/archive/html/qemu-devel/2018-02/msg01579.html > v1: https://lists.gnu.org/archive/html/qemu-devel/2017-12/msg05040.html > > Changes in v11: > * (Patch 2) Modify the ram_flags parameter to 32bits, the same size as it in > RAMBlock > * (Patch 5 and Patch 7) Delete pmem_xxx stub functions in stubs/pmem.c. Use > inline > functions with assert to replace them, because we never come there when pmem > is enabled > but lack of libpmem support. > > Changes in v10: > * (Patch 4) Fix a nit in nvdimm docs about pmem option usage in command line > The v10 patch set is all reviewed by Igor Mammedov <imamm...@redhat.com> > > Changes in v9: > * (Patch 3 and Patch 4) Reorder these two patches to make logic right. > Firstly add libpmem support, and then we can use libpmem's configure > check result. Also fix some typo and grammar issues in these two patches. > > Changs in v8: > * (Patch 3) Report a error when user set 'pmem' to file-backend, while > the qemu is lack of libpmem support. In this case, we can not ensure > the persistence of the file-backend, so we choose to fail the build > rather than contine and make the thing more confused. > > Changes in v7: > The v6 patch set has already reviewed by Stefan Hajnoczi <stefa...@redhat.com> > No logic change in this v7 version, just: > * Spelling check and some document words refined. > * Rebase to "ram is migratable" patch set. > > Changes in v6: > * (Patch 1) Expose all ram block flags rather than redefine the flags. > * (Patch 4) Use pkg-config rather the hard check when configure. > * (Patch 7) Sync and flush all the pmem data when migration completes, > rather than sync pages one by one in previous version. > > Changes in v5: > * (Patch 9) Add post copy check and output some messages for nvdimm. > > Changes in v4: > * (Patch 2) Fix compilation errors found by patchew. > > Changes in v3: > * (Patch 5) Add a is_pmem flag to ram_handle_compressed() and handle > PMEM writes in it, so we don't need the _common function. > * (Patch 6) Expose qemu_get_buffer_common so we can remove the > unnecessary qemu_get_buffer_to_pmem wrapper. > * (Patch 8) Add a is_pmem flag to xbzrle_decode_buffer() and handle > PMEM writes in it, so we can remove the unnecessary > xbzrle_decode_buffer_{common, to_pmem}. > * Move libpmem stubs to stubs/pmem.c and fix the compilation failures > of test-{xbzrle,vmstate}.c. > > Changes in v2: > * (Patch 1) Use a flags parameter in file ram allocation functions. > * (Patch 2) Add a new option 'pmem' to hostmem-file. > * (Patch 3) Use libpmem to operate on the persistent memory, rather > than re-implementing those operations in QEMU. > * (Patch 5-8) Consider the write persistence in the migration path. > > > Junyan: > [1/7] memory, exec: Expose all memory block related flags. > [6/7] migration/ram: Add check and info message to nvdimm post copy. > [7/7] migration/ram: ensure write persistence on loading all date to PMEM. > > Haozhong: > [5/7] mem/nvdimm: ensure write persistence to PMEM in label emulation > > Haozhong & Junyan: > [2/7] memory, exec: switch file ram allocation functions to 'flags' parameters > [3/7] configure: add libpmem support [4/7] hostmem-file: add the 'pmem' option > [4/7] hostmem-file: add the 'pmem' option > > -- > backends/hostmem-file.c | 44 ++++++++++++++++++++++++++++++++++++++++++-- > configure | 29 +++++++++++++++++++++++++++++ > docs/nvdimm.txt | 22 ++++++++++++++++++++++ > exec.c | 38 +++++++++++++------------------------- > hw/mem/nvdimm.c | 9 ++++++++- > include/exec/memory.h | 31 +++++++++++++++++++++++++++++-- > include/exec/ram_addr.h | 28 ++++++++++++++++++++++++++-- > include/qemu/pmem.h | 36 ++++++++++++++++++++++++++++++++++++ > memory.c | 8 +++++--- > migration/ram.c | 17 +++++++++++++++++ > numa.c | 2 +- > qemu-options.hx | 7 +++++++ > 12 files changed, 235 insertions(+), 36 deletions(-) > create mode 100644 include/qemu/pmem.h > > -- > 2.7.4 > >
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