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. Thanks! -- 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
