On Mon, Aug 29, 2016 at 11:53 PM, Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx> wrote: > > > On 08/30/2016 03:30 AM, Ross Zwisler wrote: > >> >> Can you please verify that you are using "usable" memory for your memmap? >> All >> the details are here: >> >> >> https://nvdimm.wiki.kernel.org/how_to_choose_the_correct_memmap_kernel_parameter_for_pmem_on_your_system > > > Sure. > > This is the BIOS E820 info in the guest: > > e820: BIOS-provided physical RAM map: > BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable > BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved > BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved > BIOS-e820: [mem 0x0000000000100000-0x00000000bffdefff] usable > BIOS-e820: [mem 0x00000000bffdf000-0x00000000bfffffff] reserved > BIOS-e820: [mem 0x00000000feffc000-0x00000000feffffff] reserved > BIOS-e820: [mem 0x00000000fffc0000-0x00000000ffffffff] reserved > BIOS-e820: [mem 0x0000000100000000-0x000000083fffffff] usable > NX (Execute Disable) protection: active > e820: user-defined physical RAM map: > user: [mem 0x0000000000000000-0x000000000009fbff] usable > user: [mem 0x000000000009fc00-0x000000000009ffff] reserved > user: [mem 0x00000000000f0000-0x00000000000fffff] reserved > user: [mem 0x0000000000100000-0x00000000bffdefff] usable > user: [mem 0x00000000bffdf000-0x00000000bfffffff] reserved > user: [mem 0x00000000feffc000-0x00000000feffffff] reserved > user: [mem 0x00000000fffc0000-0x00000000ffffffff] reserved > user: [mem 0x0000000100000000-0x000000027fffffff] usable > user: [mem 0x0000000280000000-0x00000003ffffffff] persistent (type 12) > user: [mem 0x0000000400000000-0x000000083fffffff] usable > > So that the memory we used to emulate PMEM split the 'usable' region. > >> >> My guess is that Boaz was correct, and that your memmap is off using >> addresses >> that don't actually map to memory. > > > I do not think so. :( > > I did mmap-write and mmap-read test, the data written by mmap-write can be > correctly read out, so that the backend memory is really existing. > Can you post your exact reproduction steps? This test is not failing for me. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
