Re: [Xen-devel] [RFC Design Doc] Add vNVDIMM support for Xen

[George Dunlap <george.dunlap@xxxxxxxxxx>]

On 03/02/16 12:02, Stefano Stabellini wrote:
> On Wed, 3 Feb 2016, Haozhong Zhang wrote:
>> Or, we can make a file system on /dev/pmem0, create files on it, set
>> the owner of those files to xen-qemuuser-domid$domid, and then pass
>> those files to QEMU. In this way, non-root QEMU should be able to
>> mmap those files.
> 
> Maybe that would work. Worth adding it to the design, I would like to
> read more details on it.
> 
> Also note that QEMU initially runs as root but drops privileges to
> xen-qemuuser-domid$domid before the guest is started. Initially QEMU
> *could* mmap /dev/pmem0 while is still running as root, but then it
> wouldn't work for any devices that need to be mmap'ed at run time
> (hotplug scenario).

This is basically the same problem we have for a bunch of other things,
right?  Having xl open a file and then pass it via qmp to qemu should
work in theory, right?

 -George


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