Re: [Xen-devel] Upstream QEMU based stubdom and rump kernel

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Tue, 2015-03-17 at 14:29 +0000, Wei Liu wrote:
> 2. The ability to access files in Dom0. That will be used to write to /
>    read from QEMU state file.

This requirement is not as broad as you make it sound.

All which is really required is the ability to slurp in or write out a
blob of bytes to a service running in a control domain, not actual
ability to read/write files in dom0 (which would need careful security
consideration!).

For the old qemu-traditional stubdom for example this is implemented as
a pair of console devices (one r/o for restore + one w/o for save) which
are setup by the toolstack at start of day and pre-plumbed into two
temporary files.

Ian.


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