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Re: [PATCH RESEND v2] block/nvme: introduce PMR support from NVMe 1.4 sp

From: Andrzej Jakowski
Subject: Re: [PATCH RESEND v2] block/nvme: introduce PMR support from NVMe 1.4 spec
Date: Wed, 11 Mar 2020 15:54:31 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0

On 3/11/20 2:20 AM, Stefan Hajnoczi wrote:
> Please try:
>   $ git grep pmem
> backends/hostmem-file.c is the backend that can be used and the
> pmem_persist() API can be used to flush writes.

I've reworked this patch into hostmem-file type of backend.
>From simple tests in virtual machine: writing to PMR region
and then reading from it after VM power cycle I have observed that
there is no persistency.

I guess that persistent behavior can be achieved if memory backend file
resides on actual persistent memory in VMM. I haven't found mechanism to
persist memory backend file when it resides in the file system on block
storage. My original mmap + msync based solution worked well there.
I believe that main problem with mmap was with "ifdef _WIN32" that made it 
platform specific and w/o it patchew CI complained. 
Is there a way that I could rework mmap + msync solution so it would fit
into qemu design?

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